1 // SPDX-License-Identifier: GPL-2.0-only
4 * Android IPC Subsystem
6 * Copyright (C) 2007-2008 Google, Inc.
12 * There are 3 main spinlocks which must be acquired in the
15 * 1) proc->outer_lock : protects binder_ref
16 * binder_proc_lock() and binder_proc_unlock() are
18 * 2) node->lock : protects most fields of binder_node.
19 * binder_node_lock() and binder_node_unlock() are
21 * 3) proc->inner_lock : protects the thread and node lists
22 * (proc->threads, proc->waiting_threads, proc->nodes)
23 * and all todo lists associated with the binder_proc
24 * (proc->todo, thread->todo, proc->delivered_death and
25 * node->async_todo), as well as thread->transaction_stack
26 * binder_inner_proc_lock() and binder_inner_proc_unlock()
29 * Any lock under procA must never be nested under any lock at the same
30 * level or below on procB.
32 * Functions that require a lock held on entry indicate which lock
33 * in the suffix of the function name:
35 * foo_olocked() : requires node->outer_lock
36 * foo_nlocked() : requires node->lock
37 * foo_ilocked() : requires proc->inner_lock
38 * foo_oilocked(): requires proc->outer_lock and proc->inner_lock
39 * foo_nilocked(): requires node->lock and proc->inner_lock
43 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
45 #include <linux/fdtable.h>
46 #include <linux/file.h>
47 #include <linux/freezer.h>
49 #include <linux/list.h>
50 #include <linux/miscdevice.h>
51 #include <linux/module.h>
52 #include <linux/mutex.h>
53 #include <linux/nsproxy.h>
54 #include <linux/poll.h>
55 #include <linux/debugfs.h>
56 #include <linux/rbtree.h>
57 #include <linux/sched/signal.h>
58 #include <linux/sched/mm.h>
59 #include <linux/seq_file.h>
60 #include <linux/string.h>
61 #include <linux/uaccess.h>
62 #include <linux/pid_namespace.h>
63 #include <linux/security.h>
64 #include <linux/spinlock.h>
65 #include <linux/ratelimit.h>
66 #include <linux/syscalls.h>
67 #include <linux/task_work.h>
68 #include <linux/sizes.h>
70 #include <uapi/linux/android/binder.h>
72 #include <asm/cacheflush.h>
74 #include "binder_internal.h"
75 #include "binder_trace.h"
77 static HLIST_HEAD(binder_deferred_list);
78 static DEFINE_MUTEX(binder_deferred_lock);
80 static HLIST_HEAD(binder_devices);
81 static HLIST_HEAD(binder_procs);
82 static DEFINE_MUTEX(binder_procs_lock);
84 static HLIST_HEAD(binder_dead_nodes);
85 static DEFINE_SPINLOCK(binder_dead_nodes_lock);
87 static struct dentry *binder_debugfs_dir_entry_root;
88 static struct dentry *binder_debugfs_dir_entry_proc;
89 static atomic_t binder_last_id;
91 static int proc_show(struct seq_file *m, void *unused);
92 DEFINE_SHOW_ATTRIBUTE(proc);
94 #define FORBIDDEN_MMAP_FLAGS (VM_WRITE)
97 BINDER_DEBUG_USER_ERROR = 1U << 0,
98 BINDER_DEBUG_FAILED_TRANSACTION = 1U << 1,
99 BINDER_DEBUG_DEAD_TRANSACTION = 1U << 2,
100 BINDER_DEBUG_OPEN_CLOSE = 1U << 3,
101 BINDER_DEBUG_DEAD_BINDER = 1U << 4,
102 BINDER_DEBUG_DEATH_NOTIFICATION = 1U << 5,
103 BINDER_DEBUG_READ_WRITE = 1U << 6,
104 BINDER_DEBUG_USER_REFS = 1U << 7,
105 BINDER_DEBUG_THREADS = 1U << 8,
106 BINDER_DEBUG_TRANSACTION = 1U << 9,
107 BINDER_DEBUG_TRANSACTION_COMPLETE = 1U << 10,
108 BINDER_DEBUG_FREE_BUFFER = 1U << 11,
109 BINDER_DEBUG_INTERNAL_REFS = 1U << 12,
110 BINDER_DEBUG_PRIORITY_CAP = 1U << 13,
111 BINDER_DEBUG_SPINLOCKS = 1U << 14,
113 static uint32_t binder_debug_mask = BINDER_DEBUG_USER_ERROR |
114 BINDER_DEBUG_FAILED_TRANSACTION | BINDER_DEBUG_DEAD_TRANSACTION;
115 module_param_named(debug_mask, binder_debug_mask, uint, 0644);
117 char *binder_devices_param = CONFIG_ANDROID_BINDER_DEVICES;
118 module_param_named(devices, binder_devices_param, charp, 0444);
120 static DECLARE_WAIT_QUEUE_HEAD(binder_user_error_wait);
121 static int binder_stop_on_user_error;
123 static int binder_set_stop_on_user_error(const char *val,
124 const struct kernel_param *kp)
128 ret = param_set_int(val, kp);
129 if (binder_stop_on_user_error < 2)
130 wake_up(&binder_user_error_wait);
133 module_param_call(stop_on_user_error, binder_set_stop_on_user_error,
134 param_get_int, &binder_stop_on_user_error, 0644);
136 #define binder_debug(mask, x...) \
138 if (binder_debug_mask & mask) \
139 pr_info_ratelimited(x); \
142 #define binder_user_error(x...) \
144 if (binder_debug_mask & BINDER_DEBUG_USER_ERROR) \
145 pr_info_ratelimited(x); \
146 if (binder_stop_on_user_error) \
147 binder_stop_on_user_error = 2; \
150 #define to_flat_binder_object(hdr) \
151 container_of(hdr, struct flat_binder_object, hdr)
153 #define to_binder_fd_object(hdr) container_of(hdr, struct binder_fd_object, hdr)
155 #define to_binder_buffer_object(hdr) \
156 container_of(hdr, struct binder_buffer_object, hdr)
158 #define to_binder_fd_array_object(hdr) \
159 container_of(hdr, struct binder_fd_array_object, hdr)
161 static struct binder_stats binder_stats;
163 static inline void binder_stats_deleted(enum binder_stat_types type)
165 atomic_inc(&binder_stats.obj_deleted[type]);
168 static inline void binder_stats_created(enum binder_stat_types type)
170 atomic_inc(&binder_stats.obj_created[type]);
173 struct binder_transaction_log binder_transaction_log;
174 struct binder_transaction_log binder_transaction_log_failed;
176 static struct binder_transaction_log_entry *binder_transaction_log_add(
177 struct binder_transaction_log *log)
179 struct binder_transaction_log_entry *e;
180 unsigned int cur = atomic_inc_return(&log->cur);
182 if (cur >= ARRAY_SIZE(log->entry))
184 e = &log->entry[cur % ARRAY_SIZE(log->entry)];
185 WRITE_ONCE(e->debug_id_done, 0);
187 * write-barrier to synchronize access to e->debug_id_done.
188 * We make sure the initialized 0 value is seen before
189 * memset() other fields are zeroed by memset.
192 memset(e, 0, sizeof(*e));
196 enum binder_deferred_state {
197 BINDER_DEFERRED_FLUSH = 0x01,
198 BINDER_DEFERRED_RELEASE = 0x02,
202 BINDER_LOOPER_STATE_REGISTERED = 0x01,
203 BINDER_LOOPER_STATE_ENTERED = 0x02,
204 BINDER_LOOPER_STATE_EXITED = 0x04,
205 BINDER_LOOPER_STATE_INVALID = 0x08,
206 BINDER_LOOPER_STATE_WAITING = 0x10,
207 BINDER_LOOPER_STATE_POLL = 0x20,
211 * binder_proc_lock() - Acquire outer lock for given binder_proc
212 * @proc: struct binder_proc to acquire
214 * Acquires proc->outer_lock. Used to protect binder_ref
215 * structures associated with the given proc.
217 #define binder_proc_lock(proc) _binder_proc_lock(proc, __LINE__)
219 _binder_proc_lock(struct binder_proc *proc, int line)
220 __acquires(&proc->outer_lock)
222 binder_debug(BINDER_DEBUG_SPINLOCKS,
223 "%s: line=%d\n", __func__, line);
224 spin_lock(&proc->outer_lock);
228 * binder_proc_unlock() - Release spinlock for given binder_proc
229 * @proc: struct binder_proc to acquire
231 * Release lock acquired via binder_proc_lock()
233 #define binder_proc_unlock(_proc) _binder_proc_unlock(_proc, __LINE__)
235 _binder_proc_unlock(struct binder_proc *proc, int line)
236 __releases(&proc->outer_lock)
238 binder_debug(BINDER_DEBUG_SPINLOCKS,
239 "%s: line=%d\n", __func__, line);
240 spin_unlock(&proc->outer_lock);
244 * binder_inner_proc_lock() - Acquire inner lock for given binder_proc
245 * @proc: struct binder_proc to acquire
247 * Acquires proc->inner_lock. Used to protect todo lists
249 #define binder_inner_proc_lock(proc) _binder_inner_proc_lock(proc, __LINE__)
251 _binder_inner_proc_lock(struct binder_proc *proc, int line)
252 __acquires(&proc->inner_lock)
254 binder_debug(BINDER_DEBUG_SPINLOCKS,
255 "%s: line=%d\n", __func__, line);
256 spin_lock(&proc->inner_lock);
260 * binder_inner_proc_unlock() - Release inner lock for given binder_proc
261 * @proc: struct binder_proc to acquire
263 * Release lock acquired via binder_inner_proc_lock()
265 #define binder_inner_proc_unlock(proc) _binder_inner_proc_unlock(proc, __LINE__)
267 _binder_inner_proc_unlock(struct binder_proc *proc, int line)
268 __releases(&proc->inner_lock)
270 binder_debug(BINDER_DEBUG_SPINLOCKS,
271 "%s: line=%d\n", __func__, line);
272 spin_unlock(&proc->inner_lock);
276 * binder_node_lock() - Acquire spinlock for given binder_node
277 * @node: struct binder_node to acquire
279 * Acquires node->lock. Used to protect binder_node fields
281 #define binder_node_lock(node) _binder_node_lock(node, __LINE__)
283 _binder_node_lock(struct binder_node *node, int line)
284 __acquires(&node->lock)
286 binder_debug(BINDER_DEBUG_SPINLOCKS,
287 "%s: line=%d\n", __func__, line);
288 spin_lock(&node->lock);
292 * binder_node_unlock() - Release spinlock for given binder_proc
293 * @node: struct binder_node to acquire
295 * Release lock acquired via binder_node_lock()
297 #define binder_node_unlock(node) _binder_node_unlock(node, __LINE__)
299 _binder_node_unlock(struct binder_node *node, int line)
300 __releases(&node->lock)
302 binder_debug(BINDER_DEBUG_SPINLOCKS,
303 "%s: line=%d\n", __func__, line);
304 spin_unlock(&node->lock);
308 * binder_node_inner_lock() - Acquire node and inner locks
309 * @node: struct binder_node to acquire
311 * Acquires node->lock. If node->proc also acquires
312 * proc->inner_lock. Used to protect binder_node fields
314 #define binder_node_inner_lock(node) _binder_node_inner_lock(node, __LINE__)
316 _binder_node_inner_lock(struct binder_node *node, int line)
317 __acquires(&node->lock) __acquires(&node->proc->inner_lock)
319 binder_debug(BINDER_DEBUG_SPINLOCKS,
320 "%s: line=%d\n", __func__, line);
321 spin_lock(&node->lock);
323 binder_inner_proc_lock(node->proc);
325 /* annotation for sparse */
326 __acquire(&node->proc->inner_lock);
330 * binder_node_unlock() - Release node and inner locks
331 * @node: struct binder_node to acquire
333 * Release lock acquired via binder_node_lock()
335 #define binder_node_inner_unlock(node) _binder_node_inner_unlock(node, __LINE__)
337 _binder_node_inner_unlock(struct binder_node *node, int line)
338 __releases(&node->lock) __releases(&node->proc->inner_lock)
340 struct binder_proc *proc = node->proc;
342 binder_debug(BINDER_DEBUG_SPINLOCKS,
343 "%s: line=%d\n", __func__, line);
345 binder_inner_proc_unlock(proc);
347 /* annotation for sparse */
348 __release(&node->proc->inner_lock);
349 spin_unlock(&node->lock);
352 static bool binder_worklist_empty_ilocked(struct list_head *list)
354 return list_empty(list);
358 * binder_worklist_empty() - Check if no items on the work list
359 * @proc: binder_proc associated with list
360 * @list: list to check
362 * Return: true if there are no items on list, else false
364 static bool binder_worklist_empty(struct binder_proc *proc,
365 struct list_head *list)
369 binder_inner_proc_lock(proc);
370 ret = binder_worklist_empty_ilocked(list);
371 binder_inner_proc_unlock(proc);
376 * binder_enqueue_work_ilocked() - Add an item to the work list
377 * @work: struct binder_work to add to list
378 * @target_list: list to add work to
380 * Adds the work to the specified list. Asserts that work
381 * is not already on a list.
383 * Requires the proc->inner_lock to be held.
386 binder_enqueue_work_ilocked(struct binder_work *work,
387 struct list_head *target_list)
389 BUG_ON(target_list == NULL);
390 BUG_ON(work->entry.next && !list_empty(&work->entry));
391 list_add_tail(&work->entry, target_list);
395 * binder_enqueue_deferred_thread_work_ilocked() - Add deferred thread work
396 * @thread: thread to queue work to
397 * @work: struct binder_work to add to list
399 * Adds the work to the todo list of the thread. Doesn't set the process_todo
400 * flag, which means that (if it wasn't already set) the thread will go to
401 * sleep without handling this work when it calls read.
403 * Requires the proc->inner_lock to be held.
406 binder_enqueue_deferred_thread_work_ilocked(struct binder_thread *thread,
407 struct binder_work *work)
409 WARN_ON(!list_empty(&thread->waiting_thread_node));
410 binder_enqueue_work_ilocked(work, &thread->todo);
414 * binder_enqueue_thread_work_ilocked() - Add an item to the thread work list
415 * @thread: thread to queue work to
416 * @work: struct binder_work to add to list
418 * Adds the work to the todo list of the thread, and enables processing
421 * Requires the proc->inner_lock to be held.
424 binder_enqueue_thread_work_ilocked(struct binder_thread *thread,
425 struct binder_work *work)
427 WARN_ON(!list_empty(&thread->waiting_thread_node));
428 binder_enqueue_work_ilocked(work, &thread->todo);
429 thread->process_todo = true;
433 * binder_enqueue_thread_work() - Add an item to the thread work list
434 * @thread: thread to queue work to
435 * @work: struct binder_work to add to list
437 * Adds the work to the todo list of the thread, and enables processing
441 binder_enqueue_thread_work(struct binder_thread *thread,
442 struct binder_work *work)
444 binder_inner_proc_lock(thread->proc);
445 binder_enqueue_thread_work_ilocked(thread, work);
446 binder_inner_proc_unlock(thread->proc);
450 binder_dequeue_work_ilocked(struct binder_work *work)
452 list_del_init(&work->entry);
456 * binder_dequeue_work() - Removes an item from the work list
457 * @proc: binder_proc associated with list
458 * @work: struct binder_work to remove from list
460 * Removes the specified work item from whatever list it is on.
461 * Can safely be called if work is not on any list.
464 binder_dequeue_work(struct binder_proc *proc, struct binder_work *work)
466 binder_inner_proc_lock(proc);
467 binder_dequeue_work_ilocked(work);
468 binder_inner_proc_unlock(proc);
471 static struct binder_work *binder_dequeue_work_head_ilocked(
472 struct list_head *list)
474 struct binder_work *w;
476 w = list_first_entry_or_null(list, struct binder_work, entry);
478 list_del_init(&w->entry);
483 binder_defer_work(struct binder_proc *proc, enum binder_deferred_state defer);
484 static void binder_free_thread(struct binder_thread *thread);
485 static void binder_free_proc(struct binder_proc *proc);
486 static void binder_inc_node_tmpref_ilocked(struct binder_node *node);
488 static bool binder_has_work_ilocked(struct binder_thread *thread,
491 return thread->process_todo ||
492 thread->looper_need_return ||
494 !binder_worklist_empty_ilocked(&thread->proc->todo));
497 static bool binder_has_work(struct binder_thread *thread, bool do_proc_work)
501 binder_inner_proc_lock(thread->proc);
502 has_work = binder_has_work_ilocked(thread, do_proc_work);
503 binder_inner_proc_unlock(thread->proc);
508 static bool binder_available_for_proc_work_ilocked(struct binder_thread *thread)
510 return !thread->transaction_stack &&
511 binder_worklist_empty_ilocked(&thread->todo) &&
512 (thread->looper & (BINDER_LOOPER_STATE_ENTERED |
513 BINDER_LOOPER_STATE_REGISTERED));
516 static void binder_wakeup_poll_threads_ilocked(struct binder_proc *proc,
520 struct binder_thread *thread;
522 for (n = rb_first(&proc->threads); n != NULL; n = rb_next(n)) {
523 thread = rb_entry(n, struct binder_thread, rb_node);
524 if (thread->looper & BINDER_LOOPER_STATE_POLL &&
525 binder_available_for_proc_work_ilocked(thread)) {
527 wake_up_interruptible_sync(&thread->wait);
529 wake_up_interruptible(&thread->wait);
535 * binder_select_thread_ilocked() - selects a thread for doing proc work.
536 * @proc: process to select a thread from
538 * Note that calling this function moves the thread off the waiting_threads
539 * list, so it can only be woken up by the caller of this function, or a
540 * signal. Therefore, callers *should* always wake up the thread this function
543 * Return: If there's a thread currently waiting for process work,
544 * returns that thread. Otherwise returns NULL.
546 static struct binder_thread *
547 binder_select_thread_ilocked(struct binder_proc *proc)
549 struct binder_thread *thread;
551 assert_spin_locked(&proc->inner_lock);
552 thread = list_first_entry_or_null(&proc->waiting_threads,
553 struct binder_thread,
554 waiting_thread_node);
557 list_del_init(&thread->waiting_thread_node);
563 * binder_wakeup_thread_ilocked() - wakes up a thread for doing proc work.
564 * @proc: process to wake up a thread in
565 * @thread: specific thread to wake-up (may be NULL)
566 * @sync: whether to do a synchronous wake-up
568 * This function wakes up a thread in the @proc process.
569 * The caller may provide a specific thread to wake-up in
570 * the @thread parameter. If @thread is NULL, this function
571 * will wake up threads that have called poll().
573 * Note that for this function to work as expected, callers
574 * should first call binder_select_thread() to find a thread
575 * to handle the work (if they don't have a thread already),
576 * and pass the result into the @thread parameter.
578 static void binder_wakeup_thread_ilocked(struct binder_proc *proc,
579 struct binder_thread *thread,
582 assert_spin_locked(&proc->inner_lock);
586 wake_up_interruptible_sync(&thread->wait);
588 wake_up_interruptible(&thread->wait);
592 /* Didn't find a thread waiting for proc work; this can happen
594 * 1. All threads are busy handling transactions
595 * In that case, one of those threads should call back into
596 * the kernel driver soon and pick up this work.
597 * 2. Threads are using the (e)poll interface, in which case
598 * they may be blocked on the waitqueue without having been
599 * added to waiting_threads. For this case, we just iterate
600 * over all threads not handling transaction work, and
601 * wake them all up. We wake all because we don't know whether
602 * a thread that called into (e)poll is handling non-binder
605 binder_wakeup_poll_threads_ilocked(proc, sync);
608 static void binder_wakeup_proc_ilocked(struct binder_proc *proc)
610 struct binder_thread *thread = binder_select_thread_ilocked(proc);
612 binder_wakeup_thread_ilocked(proc, thread, /* sync = */false);
615 static void binder_set_nice(long nice)
619 if (can_nice(current, nice)) {
620 set_user_nice(current, nice);
623 min_nice = rlimit_to_nice(rlimit(RLIMIT_NICE));
624 binder_debug(BINDER_DEBUG_PRIORITY_CAP,
625 "%d: nice value %ld not allowed use %ld instead\n",
626 current->pid, nice, min_nice);
627 set_user_nice(current, min_nice);
628 if (min_nice <= MAX_NICE)
630 binder_user_error("%d RLIMIT_NICE not set\n", current->pid);
633 static struct binder_node *binder_get_node_ilocked(struct binder_proc *proc,
634 binder_uintptr_t ptr)
636 struct rb_node *n = proc->nodes.rb_node;
637 struct binder_node *node;
639 assert_spin_locked(&proc->inner_lock);
642 node = rb_entry(n, struct binder_node, rb_node);
646 else if (ptr > node->ptr)
650 * take an implicit weak reference
651 * to ensure node stays alive until
652 * call to binder_put_node()
654 binder_inc_node_tmpref_ilocked(node);
661 static struct binder_node *binder_get_node(struct binder_proc *proc,
662 binder_uintptr_t ptr)
664 struct binder_node *node;
666 binder_inner_proc_lock(proc);
667 node = binder_get_node_ilocked(proc, ptr);
668 binder_inner_proc_unlock(proc);
672 static struct binder_node *binder_init_node_ilocked(
673 struct binder_proc *proc,
674 struct binder_node *new_node,
675 struct flat_binder_object *fp)
677 struct rb_node **p = &proc->nodes.rb_node;
678 struct rb_node *parent = NULL;
679 struct binder_node *node;
680 binder_uintptr_t ptr = fp ? fp->binder : 0;
681 binder_uintptr_t cookie = fp ? fp->cookie : 0;
682 __u32 flags = fp ? fp->flags : 0;
684 assert_spin_locked(&proc->inner_lock);
689 node = rb_entry(parent, struct binder_node, rb_node);
693 else if (ptr > node->ptr)
697 * A matching node is already in
698 * the rb tree. Abandon the init
701 binder_inc_node_tmpref_ilocked(node);
706 binder_stats_created(BINDER_STAT_NODE);
708 rb_link_node(&node->rb_node, parent, p);
709 rb_insert_color(&node->rb_node, &proc->nodes);
710 node->debug_id = atomic_inc_return(&binder_last_id);
713 node->cookie = cookie;
714 node->work.type = BINDER_WORK_NODE;
715 node->min_priority = flags & FLAT_BINDER_FLAG_PRIORITY_MASK;
716 node->accept_fds = !!(flags & FLAT_BINDER_FLAG_ACCEPTS_FDS);
717 node->txn_security_ctx = !!(flags & FLAT_BINDER_FLAG_TXN_SECURITY_CTX);
718 spin_lock_init(&node->lock);
719 INIT_LIST_HEAD(&node->work.entry);
720 INIT_LIST_HEAD(&node->async_todo);
721 binder_debug(BINDER_DEBUG_INTERNAL_REFS,
722 "%d:%d node %d u%016llx c%016llx created\n",
723 proc->pid, current->pid, node->debug_id,
724 (u64)node->ptr, (u64)node->cookie);
729 static struct binder_node *binder_new_node(struct binder_proc *proc,
730 struct flat_binder_object *fp)
732 struct binder_node *node;
733 struct binder_node *new_node = kzalloc(sizeof(*node), GFP_KERNEL);
737 binder_inner_proc_lock(proc);
738 node = binder_init_node_ilocked(proc, new_node, fp);
739 binder_inner_proc_unlock(proc);
740 if (node != new_node)
742 * The node was already added by another thread
749 static void binder_free_node(struct binder_node *node)
752 binder_stats_deleted(BINDER_STAT_NODE);
755 static int binder_inc_node_nilocked(struct binder_node *node, int strong,
757 struct list_head *target_list)
759 struct binder_proc *proc = node->proc;
761 assert_spin_locked(&node->lock);
763 assert_spin_locked(&proc->inner_lock);
766 if (target_list == NULL &&
767 node->internal_strong_refs == 0 &&
769 node == node->proc->context->binder_context_mgr_node &&
770 node->has_strong_ref)) {
771 pr_err("invalid inc strong node for %d\n",
775 node->internal_strong_refs++;
777 node->local_strong_refs++;
778 if (!node->has_strong_ref && target_list) {
779 struct binder_thread *thread = container_of(target_list,
780 struct binder_thread, todo);
781 binder_dequeue_work_ilocked(&node->work);
782 BUG_ON(&thread->todo != target_list);
783 binder_enqueue_deferred_thread_work_ilocked(thread,
788 node->local_weak_refs++;
789 if (!node->has_weak_ref && list_empty(&node->work.entry)) {
790 if (target_list == NULL) {
791 pr_err("invalid inc weak node for %d\n",
798 binder_enqueue_work_ilocked(&node->work, target_list);
804 static int binder_inc_node(struct binder_node *node, int strong, int internal,
805 struct list_head *target_list)
809 binder_node_inner_lock(node);
810 ret = binder_inc_node_nilocked(node, strong, internal, target_list);
811 binder_node_inner_unlock(node);
816 static bool binder_dec_node_nilocked(struct binder_node *node,
817 int strong, int internal)
819 struct binder_proc *proc = node->proc;
821 assert_spin_locked(&node->lock);
823 assert_spin_locked(&proc->inner_lock);
826 node->internal_strong_refs--;
828 node->local_strong_refs--;
829 if (node->local_strong_refs || node->internal_strong_refs)
833 node->local_weak_refs--;
834 if (node->local_weak_refs || node->tmp_refs ||
835 !hlist_empty(&node->refs))
839 if (proc && (node->has_strong_ref || node->has_weak_ref)) {
840 if (list_empty(&node->work.entry)) {
841 binder_enqueue_work_ilocked(&node->work, &proc->todo);
842 binder_wakeup_proc_ilocked(proc);
845 if (hlist_empty(&node->refs) && !node->local_strong_refs &&
846 !node->local_weak_refs && !node->tmp_refs) {
848 binder_dequeue_work_ilocked(&node->work);
849 rb_erase(&node->rb_node, &proc->nodes);
850 binder_debug(BINDER_DEBUG_INTERNAL_REFS,
851 "refless node %d deleted\n",
854 BUG_ON(!list_empty(&node->work.entry));
855 spin_lock(&binder_dead_nodes_lock);
857 * tmp_refs could have changed so
860 if (node->tmp_refs) {
861 spin_unlock(&binder_dead_nodes_lock);
864 hlist_del(&node->dead_node);
865 spin_unlock(&binder_dead_nodes_lock);
866 binder_debug(BINDER_DEBUG_INTERNAL_REFS,
867 "dead node %d deleted\n",
876 static void binder_dec_node(struct binder_node *node, int strong, int internal)
880 binder_node_inner_lock(node);
881 free_node = binder_dec_node_nilocked(node, strong, internal);
882 binder_node_inner_unlock(node);
884 binder_free_node(node);
887 static void binder_inc_node_tmpref_ilocked(struct binder_node *node)
890 * No call to binder_inc_node() is needed since we
891 * don't need to inform userspace of any changes to
898 * binder_inc_node_tmpref() - take a temporary reference on node
899 * @node: node to reference
901 * Take reference on node to prevent the node from being freed
902 * while referenced only by a local variable. The inner lock is
903 * needed to serialize with the node work on the queue (which
904 * isn't needed after the node is dead). If the node is dead
905 * (node->proc is NULL), use binder_dead_nodes_lock to protect
906 * node->tmp_refs against dead-node-only cases where the node
907 * lock cannot be acquired (eg traversing the dead node list to
910 static void binder_inc_node_tmpref(struct binder_node *node)
912 binder_node_lock(node);
914 binder_inner_proc_lock(node->proc);
916 spin_lock(&binder_dead_nodes_lock);
917 binder_inc_node_tmpref_ilocked(node);
919 binder_inner_proc_unlock(node->proc);
921 spin_unlock(&binder_dead_nodes_lock);
922 binder_node_unlock(node);
926 * binder_dec_node_tmpref() - remove a temporary reference on node
927 * @node: node to reference
929 * Release temporary reference on node taken via binder_inc_node_tmpref()
931 static void binder_dec_node_tmpref(struct binder_node *node)
935 binder_node_inner_lock(node);
937 spin_lock(&binder_dead_nodes_lock);
939 __acquire(&binder_dead_nodes_lock);
941 BUG_ON(node->tmp_refs < 0);
943 spin_unlock(&binder_dead_nodes_lock);
945 __release(&binder_dead_nodes_lock);
947 * Call binder_dec_node() to check if all refcounts are 0
948 * and cleanup is needed. Calling with strong=0 and internal=1
949 * causes no actual reference to be released in binder_dec_node().
950 * If that changes, a change is needed here too.
952 free_node = binder_dec_node_nilocked(node, 0, 1);
953 binder_node_inner_unlock(node);
955 binder_free_node(node);
958 static void binder_put_node(struct binder_node *node)
960 binder_dec_node_tmpref(node);
963 static struct binder_ref *binder_get_ref_olocked(struct binder_proc *proc,
964 u32 desc, bool need_strong_ref)
966 struct rb_node *n = proc->refs_by_desc.rb_node;
967 struct binder_ref *ref;
970 ref = rb_entry(n, struct binder_ref, rb_node_desc);
972 if (desc < ref->data.desc) {
974 } else if (desc > ref->data.desc) {
976 } else if (need_strong_ref && !ref->data.strong) {
977 binder_user_error("tried to use weak ref as strong ref\n");
987 * binder_get_ref_for_node_olocked() - get the ref associated with given node
988 * @proc: binder_proc that owns the ref
989 * @node: binder_node of target
990 * @new_ref: newly allocated binder_ref to be initialized or %NULL
992 * Look up the ref for the given node and return it if it exists
994 * If it doesn't exist and the caller provides a newly allocated
995 * ref, initialize the fields of the newly allocated ref and insert
996 * into the given proc rb_trees and node refs list.
998 * Return: the ref for node. It is possible that another thread
999 * allocated/initialized the ref first in which case the
1000 * returned ref would be different than the passed-in
1001 * new_ref. new_ref must be kfree'd by the caller in
1004 static struct binder_ref *binder_get_ref_for_node_olocked(
1005 struct binder_proc *proc,
1006 struct binder_node *node,
1007 struct binder_ref *new_ref)
1009 struct binder_context *context = proc->context;
1010 struct rb_node **p = &proc->refs_by_node.rb_node;
1011 struct rb_node *parent = NULL;
1012 struct binder_ref *ref;
1017 ref = rb_entry(parent, struct binder_ref, rb_node_node);
1019 if (node < ref->node)
1021 else if (node > ref->node)
1022 p = &(*p)->rb_right;
1029 binder_stats_created(BINDER_STAT_REF);
1030 new_ref->data.debug_id = atomic_inc_return(&binder_last_id);
1031 new_ref->proc = proc;
1032 new_ref->node = node;
1033 rb_link_node(&new_ref->rb_node_node, parent, p);
1034 rb_insert_color(&new_ref->rb_node_node, &proc->refs_by_node);
1036 new_ref->data.desc = (node == context->binder_context_mgr_node) ? 0 : 1;
1037 for (n = rb_first(&proc->refs_by_desc); n != NULL; n = rb_next(n)) {
1038 ref = rb_entry(n, struct binder_ref, rb_node_desc);
1039 if (ref->data.desc > new_ref->data.desc)
1041 new_ref->data.desc = ref->data.desc + 1;
1044 p = &proc->refs_by_desc.rb_node;
1047 ref = rb_entry(parent, struct binder_ref, rb_node_desc);
1049 if (new_ref->data.desc < ref->data.desc)
1051 else if (new_ref->data.desc > ref->data.desc)
1052 p = &(*p)->rb_right;
1056 rb_link_node(&new_ref->rb_node_desc, parent, p);
1057 rb_insert_color(&new_ref->rb_node_desc, &proc->refs_by_desc);
1059 binder_node_lock(node);
1060 hlist_add_head(&new_ref->node_entry, &node->refs);
1062 binder_debug(BINDER_DEBUG_INTERNAL_REFS,
1063 "%d new ref %d desc %d for node %d\n",
1064 proc->pid, new_ref->data.debug_id, new_ref->data.desc,
1066 binder_node_unlock(node);
1070 static void binder_cleanup_ref_olocked(struct binder_ref *ref)
1072 bool delete_node = false;
1074 binder_debug(BINDER_DEBUG_INTERNAL_REFS,
1075 "%d delete ref %d desc %d for node %d\n",
1076 ref->proc->pid, ref->data.debug_id, ref->data.desc,
1077 ref->node->debug_id);
1079 rb_erase(&ref->rb_node_desc, &ref->proc->refs_by_desc);
1080 rb_erase(&ref->rb_node_node, &ref->proc->refs_by_node);
1082 binder_node_inner_lock(ref->node);
1083 if (ref->data.strong)
1084 binder_dec_node_nilocked(ref->node, 1, 1);
1086 hlist_del(&ref->node_entry);
1087 delete_node = binder_dec_node_nilocked(ref->node, 0, 1);
1088 binder_node_inner_unlock(ref->node);
1090 * Clear ref->node unless we want the caller to free the node
1094 * The caller uses ref->node to determine
1095 * whether the node needs to be freed. Clear
1096 * it since the node is still alive.
1102 binder_debug(BINDER_DEBUG_DEAD_BINDER,
1103 "%d delete ref %d desc %d has death notification\n",
1104 ref->proc->pid, ref->data.debug_id,
1106 binder_dequeue_work(ref->proc, &ref->death->work);
1107 binder_stats_deleted(BINDER_STAT_DEATH);
1109 binder_stats_deleted(BINDER_STAT_REF);
1113 * binder_inc_ref_olocked() - increment the ref for given handle
1114 * @ref: ref to be incremented
1115 * @strong: if true, strong increment, else weak
1116 * @target_list: list to queue node work on
1118 * Increment the ref. @ref->proc->outer_lock must be held on entry
1120 * Return: 0, if successful, else errno
1122 static int binder_inc_ref_olocked(struct binder_ref *ref, int strong,
1123 struct list_head *target_list)
1128 if (ref->data.strong == 0) {
1129 ret = binder_inc_node(ref->node, 1, 1, target_list);
1135 if (ref->data.weak == 0) {
1136 ret = binder_inc_node(ref->node, 0, 1, target_list);
1146 * binder_dec_ref() - dec the ref for given handle
1147 * @ref: ref to be decremented
1148 * @strong: if true, strong decrement, else weak
1150 * Decrement the ref.
1152 * Return: true if ref is cleaned up and ready to be freed
1154 static bool binder_dec_ref_olocked(struct binder_ref *ref, int strong)
1157 if (ref->data.strong == 0) {
1158 binder_user_error("%d invalid dec strong, ref %d desc %d s %d w %d\n",
1159 ref->proc->pid, ref->data.debug_id,
1160 ref->data.desc, ref->data.strong,
1165 if (ref->data.strong == 0)
1166 binder_dec_node(ref->node, strong, 1);
1168 if (ref->data.weak == 0) {
1169 binder_user_error("%d invalid dec weak, ref %d desc %d s %d w %d\n",
1170 ref->proc->pid, ref->data.debug_id,
1171 ref->data.desc, ref->data.strong,
1177 if (ref->data.strong == 0 && ref->data.weak == 0) {
1178 binder_cleanup_ref_olocked(ref);
1185 * binder_get_node_from_ref() - get the node from the given proc/desc
1186 * @proc: proc containing the ref
1187 * @desc: the handle associated with the ref
1188 * @need_strong_ref: if true, only return node if ref is strong
1189 * @rdata: the id/refcount data for the ref
1191 * Given a proc and ref handle, return the associated binder_node
1193 * Return: a binder_node or NULL if not found or not strong when strong required
1195 static struct binder_node *binder_get_node_from_ref(
1196 struct binder_proc *proc,
1197 u32 desc, bool need_strong_ref,
1198 struct binder_ref_data *rdata)
1200 struct binder_node *node;
1201 struct binder_ref *ref;
1203 binder_proc_lock(proc);
1204 ref = binder_get_ref_olocked(proc, desc, need_strong_ref);
1209 * Take an implicit reference on the node to ensure
1210 * it stays alive until the call to binder_put_node()
1212 binder_inc_node_tmpref(node);
1215 binder_proc_unlock(proc);
1220 binder_proc_unlock(proc);
1225 * binder_free_ref() - free the binder_ref
1228 * Free the binder_ref. Free the binder_node indicated by ref->node
1229 * (if non-NULL) and the binder_ref_death indicated by ref->death.
1231 static void binder_free_ref(struct binder_ref *ref)
1234 binder_free_node(ref->node);
1240 * binder_update_ref_for_handle() - inc/dec the ref for given handle
1241 * @proc: proc containing the ref
1242 * @desc: the handle associated with the ref
1243 * @increment: true=inc reference, false=dec reference
1244 * @strong: true=strong reference, false=weak reference
1245 * @rdata: the id/refcount data for the ref
1247 * Given a proc and ref handle, increment or decrement the ref
1248 * according to "increment" arg.
1250 * Return: 0 if successful, else errno
1252 static int binder_update_ref_for_handle(struct binder_proc *proc,
1253 uint32_t desc, bool increment, bool strong,
1254 struct binder_ref_data *rdata)
1257 struct binder_ref *ref;
1258 bool delete_ref = false;
1260 binder_proc_lock(proc);
1261 ref = binder_get_ref_olocked(proc, desc, strong);
1267 ret = binder_inc_ref_olocked(ref, strong, NULL);
1269 delete_ref = binder_dec_ref_olocked(ref, strong);
1273 binder_proc_unlock(proc);
1276 binder_free_ref(ref);
1280 binder_proc_unlock(proc);
1285 * binder_dec_ref_for_handle() - dec the ref for given handle
1286 * @proc: proc containing the ref
1287 * @desc: the handle associated with the ref
1288 * @strong: true=strong reference, false=weak reference
1289 * @rdata: the id/refcount data for the ref
1291 * Just calls binder_update_ref_for_handle() to decrement the ref.
1293 * Return: 0 if successful, else errno
1295 static int binder_dec_ref_for_handle(struct binder_proc *proc,
1296 uint32_t desc, bool strong, struct binder_ref_data *rdata)
1298 return binder_update_ref_for_handle(proc, desc, false, strong, rdata);
1303 * binder_inc_ref_for_node() - increment the ref for given proc/node
1304 * @proc: proc containing the ref
1305 * @node: target node
1306 * @strong: true=strong reference, false=weak reference
1307 * @target_list: worklist to use if node is incremented
1308 * @rdata: the id/refcount data for the ref
1310 * Given a proc and node, increment the ref. Create the ref if it
1311 * doesn't already exist
1313 * Return: 0 if successful, else errno
1315 static int binder_inc_ref_for_node(struct binder_proc *proc,
1316 struct binder_node *node,
1318 struct list_head *target_list,
1319 struct binder_ref_data *rdata)
1321 struct binder_ref *ref;
1322 struct binder_ref *new_ref = NULL;
1325 binder_proc_lock(proc);
1326 ref = binder_get_ref_for_node_olocked(proc, node, NULL);
1328 binder_proc_unlock(proc);
1329 new_ref = kzalloc(sizeof(*ref), GFP_KERNEL);
1332 binder_proc_lock(proc);
1333 ref = binder_get_ref_for_node_olocked(proc, node, new_ref);
1335 ret = binder_inc_ref_olocked(ref, strong, target_list);
1337 binder_proc_unlock(proc);
1338 if (new_ref && ref != new_ref)
1340 * Another thread created the ref first so
1341 * free the one we allocated
1347 static void binder_pop_transaction_ilocked(struct binder_thread *target_thread,
1348 struct binder_transaction *t)
1350 BUG_ON(!target_thread);
1351 assert_spin_locked(&target_thread->proc->inner_lock);
1352 BUG_ON(target_thread->transaction_stack != t);
1353 BUG_ON(target_thread->transaction_stack->from != target_thread);
1354 target_thread->transaction_stack =
1355 target_thread->transaction_stack->from_parent;
1360 * binder_thread_dec_tmpref() - decrement thread->tmp_ref
1361 * @thread: thread to decrement
1363 * A thread needs to be kept alive while being used to create or
1364 * handle a transaction. binder_get_txn_from() is used to safely
1365 * extract t->from from a binder_transaction and keep the thread
1366 * indicated by t->from from being freed. When done with that
1367 * binder_thread, this function is called to decrement the
1368 * tmp_ref and free if appropriate (thread has been released
1369 * and no transaction being processed by the driver)
1371 static void binder_thread_dec_tmpref(struct binder_thread *thread)
1374 * atomic is used to protect the counter value while
1375 * it cannot reach zero or thread->is_dead is false
1377 binder_inner_proc_lock(thread->proc);
1378 atomic_dec(&thread->tmp_ref);
1379 if (thread->is_dead && !atomic_read(&thread->tmp_ref)) {
1380 binder_inner_proc_unlock(thread->proc);
1381 binder_free_thread(thread);
1384 binder_inner_proc_unlock(thread->proc);
1388 * binder_proc_dec_tmpref() - decrement proc->tmp_ref
1389 * @proc: proc to decrement
1391 * A binder_proc needs to be kept alive while being used to create or
1392 * handle a transaction. proc->tmp_ref is incremented when
1393 * creating a new transaction or the binder_proc is currently in-use
1394 * by threads that are being released. When done with the binder_proc,
1395 * this function is called to decrement the counter and free the
1396 * proc if appropriate (proc has been released, all threads have
1397 * been released and not currenly in-use to process a transaction).
1399 static void binder_proc_dec_tmpref(struct binder_proc *proc)
1401 binder_inner_proc_lock(proc);
1403 if (proc->is_dead && RB_EMPTY_ROOT(&proc->threads) &&
1405 binder_inner_proc_unlock(proc);
1406 binder_free_proc(proc);
1409 binder_inner_proc_unlock(proc);
1413 * binder_get_txn_from() - safely extract the "from" thread in transaction
1414 * @t: binder transaction for t->from
1416 * Atomically return the "from" thread and increment the tmp_ref
1417 * count for the thread to ensure it stays alive until
1418 * binder_thread_dec_tmpref() is called.
1420 * Return: the value of t->from
1422 static struct binder_thread *binder_get_txn_from(
1423 struct binder_transaction *t)
1425 struct binder_thread *from;
1427 spin_lock(&t->lock);
1430 atomic_inc(&from->tmp_ref);
1431 spin_unlock(&t->lock);
1436 * binder_get_txn_from_and_acq_inner() - get t->from and acquire inner lock
1437 * @t: binder transaction for t->from
1439 * Same as binder_get_txn_from() except it also acquires the proc->inner_lock
1440 * to guarantee that the thread cannot be released while operating on it.
1441 * The caller must call binder_inner_proc_unlock() to release the inner lock
1442 * as well as call binder_dec_thread_txn() to release the reference.
1444 * Return: the value of t->from
1446 static struct binder_thread *binder_get_txn_from_and_acq_inner(
1447 struct binder_transaction *t)
1448 __acquires(&t->from->proc->inner_lock)
1450 struct binder_thread *from;
1452 from = binder_get_txn_from(t);
1454 __acquire(&from->proc->inner_lock);
1457 binder_inner_proc_lock(from->proc);
1459 BUG_ON(from != t->from);
1462 binder_inner_proc_unlock(from->proc);
1463 __acquire(&from->proc->inner_lock);
1464 binder_thread_dec_tmpref(from);
1469 * binder_free_txn_fixups() - free unprocessed fd fixups
1470 * @t: binder transaction for t->from
1472 * If the transaction is being torn down prior to being
1473 * processed by the target process, free all of the
1474 * fd fixups and fput the file structs. It is safe to
1475 * call this function after the fixups have been
1476 * processed -- in that case, the list will be empty.
1478 static void binder_free_txn_fixups(struct binder_transaction *t)
1480 struct binder_txn_fd_fixup *fixup, *tmp;
1482 list_for_each_entry_safe(fixup, tmp, &t->fd_fixups, fixup_entry) {
1484 list_del(&fixup->fixup_entry);
1489 static void binder_txn_latency_free(struct binder_transaction *t)
1491 int from_proc, from_thread, to_proc, to_thread;
1493 spin_lock(&t->lock);
1494 from_proc = t->from ? t->from->proc->pid : 0;
1495 from_thread = t->from ? t->from->pid : 0;
1496 to_proc = t->to_proc ? t->to_proc->pid : 0;
1497 to_thread = t->to_thread ? t->to_thread->pid : 0;
1498 spin_unlock(&t->lock);
1500 trace_binder_txn_latency_free(t, from_proc, from_thread, to_proc, to_thread);
1503 static void binder_free_transaction(struct binder_transaction *t)
1505 struct binder_proc *target_proc = t->to_proc;
1508 binder_inner_proc_lock(target_proc);
1509 target_proc->outstanding_txns--;
1510 if (target_proc->outstanding_txns < 0)
1511 pr_warn("%s: Unexpected outstanding_txns %d\n",
1512 __func__, target_proc->outstanding_txns);
1513 if (!target_proc->outstanding_txns && target_proc->is_frozen)
1514 wake_up_interruptible_all(&target_proc->freeze_wait);
1516 t->buffer->transaction = NULL;
1517 binder_inner_proc_unlock(target_proc);
1519 if (trace_binder_txn_latency_free_enabled())
1520 binder_txn_latency_free(t);
1522 * If the transaction has no target_proc, then
1523 * t->buffer->transaction has already been cleared.
1525 binder_free_txn_fixups(t);
1527 binder_stats_deleted(BINDER_STAT_TRANSACTION);
1530 static void binder_send_failed_reply(struct binder_transaction *t,
1531 uint32_t error_code)
1533 struct binder_thread *target_thread;
1534 struct binder_transaction *next;
1536 BUG_ON(t->flags & TF_ONE_WAY);
1538 target_thread = binder_get_txn_from_and_acq_inner(t);
1539 if (target_thread) {
1540 binder_debug(BINDER_DEBUG_FAILED_TRANSACTION,
1541 "send failed reply for transaction %d to %d:%d\n",
1543 target_thread->proc->pid,
1544 target_thread->pid);
1546 binder_pop_transaction_ilocked(target_thread, t);
1547 if (target_thread->reply_error.cmd == BR_OK) {
1548 target_thread->reply_error.cmd = error_code;
1549 binder_enqueue_thread_work_ilocked(
1551 &target_thread->reply_error.work);
1552 wake_up_interruptible(&target_thread->wait);
1555 * Cannot get here for normal operation, but
1556 * we can if multiple synchronous transactions
1557 * are sent without blocking for responses.
1558 * Just ignore the 2nd error in this case.
1560 pr_warn("Unexpected reply error: %u\n",
1561 target_thread->reply_error.cmd);
1563 binder_inner_proc_unlock(target_thread->proc);
1564 binder_thread_dec_tmpref(target_thread);
1565 binder_free_transaction(t);
1568 __release(&target_thread->proc->inner_lock);
1569 next = t->from_parent;
1571 binder_debug(BINDER_DEBUG_FAILED_TRANSACTION,
1572 "send failed reply for transaction %d, target dead\n",
1575 binder_free_transaction(t);
1577 binder_debug(BINDER_DEBUG_DEAD_BINDER,
1578 "reply failed, no target thread at root\n");
1582 binder_debug(BINDER_DEBUG_DEAD_BINDER,
1583 "reply failed, no target thread -- retry %d\n",
1589 * binder_cleanup_transaction() - cleans up undelivered transaction
1590 * @t: transaction that needs to be cleaned up
1591 * @reason: reason the transaction wasn't delivered
1592 * @error_code: error to return to caller (if synchronous call)
1594 static void binder_cleanup_transaction(struct binder_transaction *t,
1596 uint32_t error_code)
1598 if (t->buffer->target_node && !(t->flags & TF_ONE_WAY)) {
1599 binder_send_failed_reply(t, error_code);
1601 binder_debug(BINDER_DEBUG_DEAD_TRANSACTION,
1602 "undelivered transaction %d, %s\n",
1603 t->debug_id, reason);
1604 binder_free_transaction(t);
1609 * binder_get_object() - gets object and checks for valid metadata
1610 * @proc: binder_proc owning the buffer
1611 * @buffer: binder_buffer that we're parsing.
1612 * @offset: offset in the @buffer at which to validate an object.
1613 * @object: struct binder_object to read into
1615 * Return: If there's a valid metadata object at @offset in @buffer, the
1616 * size of that object. Otherwise, it returns zero. The object
1617 * is read into the struct binder_object pointed to by @object.
1619 static size_t binder_get_object(struct binder_proc *proc,
1620 struct binder_buffer *buffer,
1621 unsigned long offset,
1622 struct binder_object *object)
1625 struct binder_object_header *hdr;
1626 size_t object_size = 0;
1628 read_size = min_t(size_t, sizeof(*object), buffer->data_size - offset);
1629 if (offset > buffer->data_size || read_size < sizeof(*hdr) ||
1630 binder_alloc_copy_from_buffer(&proc->alloc, object, buffer,
1634 /* Ok, now see if we read a complete object. */
1636 switch (hdr->type) {
1637 case BINDER_TYPE_BINDER:
1638 case BINDER_TYPE_WEAK_BINDER:
1639 case BINDER_TYPE_HANDLE:
1640 case BINDER_TYPE_WEAK_HANDLE:
1641 object_size = sizeof(struct flat_binder_object);
1643 case BINDER_TYPE_FD:
1644 object_size = sizeof(struct binder_fd_object);
1646 case BINDER_TYPE_PTR:
1647 object_size = sizeof(struct binder_buffer_object);
1649 case BINDER_TYPE_FDA:
1650 object_size = sizeof(struct binder_fd_array_object);
1655 if (offset <= buffer->data_size - object_size &&
1656 buffer->data_size >= object_size)
1663 * binder_validate_ptr() - validates binder_buffer_object in a binder_buffer.
1664 * @proc: binder_proc owning the buffer
1665 * @b: binder_buffer containing the object
1666 * @object: struct binder_object to read into
1667 * @index: index in offset array at which the binder_buffer_object is
1669 * @start_offset: points to the start of the offset array
1670 * @object_offsetp: offset of @object read from @b
1671 * @num_valid: the number of valid offsets in the offset array
1673 * Return: If @index is within the valid range of the offset array
1674 * described by @start and @num_valid, and if there's a valid
1675 * binder_buffer_object at the offset found in index @index
1676 * of the offset array, that object is returned. Otherwise,
1677 * %NULL is returned.
1678 * Note that the offset found in index @index itself is not
1679 * verified; this function assumes that @num_valid elements
1680 * from @start were previously verified to have valid offsets.
1681 * If @object_offsetp is non-NULL, then the offset within
1682 * @b is written to it.
1684 static struct binder_buffer_object *binder_validate_ptr(
1685 struct binder_proc *proc,
1686 struct binder_buffer *b,
1687 struct binder_object *object,
1688 binder_size_t index,
1689 binder_size_t start_offset,
1690 binder_size_t *object_offsetp,
1691 binder_size_t num_valid)
1694 binder_size_t object_offset;
1695 unsigned long buffer_offset;
1697 if (index >= num_valid)
1700 buffer_offset = start_offset + sizeof(binder_size_t) * index;
1701 if (binder_alloc_copy_from_buffer(&proc->alloc, &object_offset,
1703 sizeof(object_offset)))
1705 object_size = binder_get_object(proc, b, object_offset, object);
1706 if (!object_size || object->hdr.type != BINDER_TYPE_PTR)
1709 *object_offsetp = object_offset;
1711 return &object->bbo;
1715 * binder_validate_fixup() - validates pointer/fd fixups happen in order.
1716 * @proc: binder_proc owning the buffer
1717 * @b: transaction buffer
1718 * @objects_start_offset: offset to start of objects buffer
1719 * @buffer_obj_offset: offset to binder_buffer_object in which to fix up
1720 * @fixup_offset: start offset in @buffer to fix up
1721 * @last_obj_offset: offset to last binder_buffer_object that we fixed
1722 * @last_min_offset: minimum fixup offset in object at @last_obj_offset
1724 * Return: %true if a fixup in buffer @buffer at offset @offset is
1727 * For safety reasons, we only allow fixups inside a buffer to happen
1728 * at increasing offsets; additionally, we only allow fixup on the last
1729 * buffer object that was verified, or one of its parents.
1731 * Example of what is allowed:
1734 * B (parent = A, offset = 0)
1735 * C (parent = A, offset = 16)
1736 * D (parent = C, offset = 0)
1737 * E (parent = A, offset = 32) // min_offset is 16 (C.parent_offset)
1739 * Examples of what is not allowed:
1741 * Decreasing offsets within the same parent:
1743 * C (parent = A, offset = 16)
1744 * B (parent = A, offset = 0) // decreasing offset within A
1746 * Referring to a parent that wasn't the last object or any of its parents:
1748 * B (parent = A, offset = 0)
1749 * C (parent = A, offset = 0)
1750 * C (parent = A, offset = 16)
1751 * D (parent = B, offset = 0) // B is not A or any of A's parents
1753 static bool binder_validate_fixup(struct binder_proc *proc,
1754 struct binder_buffer *b,
1755 binder_size_t objects_start_offset,
1756 binder_size_t buffer_obj_offset,
1757 binder_size_t fixup_offset,
1758 binder_size_t last_obj_offset,
1759 binder_size_t last_min_offset)
1761 if (!last_obj_offset) {
1762 /* Nothing to fix up in */
1766 while (last_obj_offset != buffer_obj_offset) {
1767 unsigned long buffer_offset;
1768 struct binder_object last_object;
1769 struct binder_buffer_object *last_bbo;
1770 size_t object_size = binder_get_object(proc, b, last_obj_offset,
1772 if (object_size != sizeof(*last_bbo))
1775 last_bbo = &last_object.bbo;
1777 * Safe to retrieve the parent of last_obj, since it
1778 * was already previously verified by the driver.
1780 if ((last_bbo->flags & BINDER_BUFFER_FLAG_HAS_PARENT) == 0)
1782 last_min_offset = last_bbo->parent_offset + sizeof(uintptr_t);
1783 buffer_offset = objects_start_offset +
1784 sizeof(binder_size_t) * last_bbo->parent;
1785 if (binder_alloc_copy_from_buffer(&proc->alloc,
1788 sizeof(last_obj_offset)))
1791 return (fixup_offset >= last_min_offset);
1795 * struct binder_task_work_cb - for deferred close
1797 * @twork: callback_head for task work
1800 * Structure to pass task work to be handled after
1801 * returning from binder_ioctl() via task_work_add().
1803 struct binder_task_work_cb {
1804 struct callback_head twork;
1809 * binder_do_fd_close() - close list of file descriptors
1810 * @twork: callback head for task work
1812 * It is not safe to call ksys_close() during the binder_ioctl()
1813 * function if there is a chance that binder's own file descriptor
1814 * might be closed. This is to meet the requirements for using
1815 * fdget() (see comments for __fget_light()). Therefore use
1816 * task_work_add() to schedule the close operation once we have
1817 * returned from binder_ioctl(). This function is a callback
1818 * for that mechanism and does the actual ksys_close() on the
1819 * given file descriptor.
1821 static void binder_do_fd_close(struct callback_head *twork)
1823 struct binder_task_work_cb *twcb = container_of(twork,
1824 struct binder_task_work_cb, twork);
1831 * binder_deferred_fd_close() - schedule a close for the given file-descriptor
1832 * @fd: file-descriptor to close
1834 * See comments in binder_do_fd_close(). This function is used to schedule
1835 * a file-descriptor to be closed after returning from binder_ioctl().
1837 static void binder_deferred_fd_close(int fd)
1839 struct binder_task_work_cb *twcb;
1841 twcb = kzalloc(sizeof(*twcb), GFP_KERNEL);
1844 init_task_work(&twcb->twork, binder_do_fd_close);
1845 close_fd_get_file(fd, &twcb->file);
1847 filp_close(twcb->file, current->files);
1848 task_work_add(current, &twcb->twork, TWA_RESUME);
1854 static void binder_transaction_buffer_release(struct binder_proc *proc,
1855 struct binder_thread *thread,
1856 struct binder_buffer *buffer,
1857 binder_size_t failed_at,
1860 int debug_id = buffer->debug_id;
1861 binder_size_t off_start_offset, buffer_offset, off_end_offset;
1863 binder_debug(BINDER_DEBUG_TRANSACTION,
1864 "%d buffer release %d, size %zd-%zd, failed at %llx\n",
1865 proc->pid, buffer->debug_id,
1866 buffer->data_size, buffer->offsets_size,
1867 (unsigned long long)failed_at);
1869 if (buffer->target_node)
1870 binder_dec_node(buffer->target_node, 1, 0);
1872 off_start_offset = ALIGN(buffer->data_size, sizeof(void *));
1873 off_end_offset = is_failure && failed_at ? failed_at :
1874 off_start_offset + buffer->offsets_size;
1875 for (buffer_offset = off_start_offset; buffer_offset < off_end_offset;
1876 buffer_offset += sizeof(binder_size_t)) {
1877 struct binder_object_header *hdr;
1878 size_t object_size = 0;
1879 struct binder_object object;
1880 binder_size_t object_offset;
1882 if (!binder_alloc_copy_from_buffer(&proc->alloc, &object_offset,
1883 buffer, buffer_offset,
1884 sizeof(object_offset)))
1885 object_size = binder_get_object(proc, buffer,
1886 object_offset, &object);
1887 if (object_size == 0) {
1888 pr_err("transaction release %d bad object at offset %lld, size %zd\n",
1889 debug_id, (u64)object_offset, buffer->data_size);
1893 switch (hdr->type) {
1894 case BINDER_TYPE_BINDER:
1895 case BINDER_TYPE_WEAK_BINDER: {
1896 struct flat_binder_object *fp;
1897 struct binder_node *node;
1899 fp = to_flat_binder_object(hdr);
1900 node = binder_get_node(proc, fp->binder);
1902 pr_err("transaction release %d bad node %016llx\n",
1903 debug_id, (u64)fp->binder);
1906 binder_debug(BINDER_DEBUG_TRANSACTION,
1907 " node %d u%016llx\n",
1908 node->debug_id, (u64)node->ptr);
1909 binder_dec_node(node, hdr->type == BINDER_TYPE_BINDER,
1911 binder_put_node(node);
1913 case BINDER_TYPE_HANDLE:
1914 case BINDER_TYPE_WEAK_HANDLE: {
1915 struct flat_binder_object *fp;
1916 struct binder_ref_data rdata;
1919 fp = to_flat_binder_object(hdr);
1920 ret = binder_dec_ref_for_handle(proc, fp->handle,
1921 hdr->type == BINDER_TYPE_HANDLE, &rdata);
1924 pr_err("transaction release %d bad handle %d, ret = %d\n",
1925 debug_id, fp->handle, ret);
1928 binder_debug(BINDER_DEBUG_TRANSACTION,
1929 " ref %d desc %d\n",
1930 rdata.debug_id, rdata.desc);
1933 case BINDER_TYPE_FD: {
1935 * No need to close the file here since user-space
1936 * closes it for for successfully delivered
1937 * transactions. For transactions that weren't
1938 * delivered, the new fd was never allocated so
1939 * there is no need to close and the fput on the
1940 * file is done when the transaction is torn
1944 case BINDER_TYPE_PTR:
1946 * Nothing to do here, this will get cleaned up when the
1947 * transaction buffer gets freed
1950 case BINDER_TYPE_FDA: {
1951 struct binder_fd_array_object *fda;
1952 struct binder_buffer_object *parent;
1953 struct binder_object ptr_object;
1954 binder_size_t fda_offset;
1956 binder_size_t fd_buf_size;
1957 binder_size_t num_valid;
1961 * The fd fixups have not been applied so no
1962 * fds need to be closed.
1967 num_valid = (buffer_offset - off_start_offset) /
1968 sizeof(binder_size_t);
1969 fda = to_binder_fd_array_object(hdr);
1970 parent = binder_validate_ptr(proc, buffer, &ptr_object,
1976 pr_err("transaction release %d bad parent offset\n",
1980 fd_buf_size = sizeof(u32) * fda->num_fds;
1981 if (fda->num_fds >= SIZE_MAX / sizeof(u32)) {
1982 pr_err("transaction release %d invalid number of fds (%lld)\n",
1983 debug_id, (u64)fda->num_fds);
1986 if (fd_buf_size > parent->length ||
1987 fda->parent_offset > parent->length - fd_buf_size) {
1988 /* No space for all file descriptors here. */
1989 pr_err("transaction release %d not enough space for %lld fds in buffer\n",
1990 debug_id, (u64)fda->num_fds);
1994 * the source data for binder_buffer_object is visible
1995 * to user-space and the @buffer element is the user
1996 * pointer to the buffer_object containing the fd_array.
1997 * Convert the address to an offset relative to
1998 * the base of the transaction buffer.
2001 (parent->buffer - (uintptr_t)buffer->user_data) +
2003 for (fd_index = 0; fd_index < fda->num_fds;
2007 binder_size_t offset = fda_offset +
2008 fd_index * sizeof(fd);
2010 err = binder_alloc_copy_from_buffer(
2011 &proc->alloc, &fd, buffer,
2012 offset, sizeof(fd));
2015 binder_deferred_fd_close(fd);
2017 * Need to make sure the thread goes
2018 * back to userspace to complete the
2022 thread->looper_need_return = true;
2027 pr_err("transaction release %d bad object type %x\n",
2028 debug_id, hdr->type);
2034 static int binder_translate_binder(struct flat_binder_object *fp,
2035 struct binder_transaction *t,
2036 struct binder_thread *thread)
2038 struct binder_node *node;
2039 struct binder_proc *proc = thread->proc;
2040 struct binder_proc *target_proc = t->to_proc;
2041 struct binder_ref_data rdata;
2044 node = binder_get_node(proc, fp->binder);
2046 node = binder_new_node(proc, fp);
2050 if (fp->cookie != node->cookie) {
2051 binder_user_error("%d:%d sending u%016llx node %d, cookie mismatch %016llx != %016llx\n",
2052 proc->pid, thread->pid, (u64)fp->binder,
2053 node->debug_id, (u64)fp->cookie,
2058 if (security_binder_transfer_binder(proc->cred, target_proc->cred)) {
2063 ret = binder_inc_ref_for_node(target_proc, node,
2064 fp->hdr.type == BINDER_TYPE_BINDER,
2065 &thread->todo, &rdata);
2069 if (fp->hdr.type == BINDER_TYPE_BINDER)
2070 fp->hdr.type = BINDER_TYPE_HANDLE;
2072 fp->hdr.type = BINDER_TYPE_WEAK_HANDLE;
2074 fp->handle = rdata.desc;
2077 trace_binder_transaction_node_to_ref(t, node, &rdata);
2078 binder_debug(BINDER_DEBUG_TRANSACTION,
2079 " node %d u%016llx -> ref %d desc %d\n",
2080 node->debug_id, (u64)node->ptr,
2081 rdata.debug_id, rdata.desc);
2083 binder_put_node(node);
2087 static int binder_translate_handle(struct flat_binder_object *fp,
2088 struct binder_transaction *t,
2089 struct binder_thread *thread)
2091 struct binder_proc *proc = thread->proc;
2092 struct binder_proc *target_proc = t->to_proc;
2093 struct binder_node *node;
2094 struct binder_ref_data src_rdata;
2097 node = binder_get_node_from_ref(proc, fp->handle,
2098 fp->hdr.type == BINDER_TYPE_HANDLE, &src_rdata);
2100 binder_user_error("%d:%d got transaction with invalid handle, %d\n",
2101 proc->pid, thread->pid, fp->handle);
2104 if (security_binder_transfer_binder(proc->cred, target_proc->cred)) {
2109 binder_node_lock(node);
2110 if (node->proc == target_proc) {
2111 if (fp->hdr.type == BINDER_TYPE_HANDLE)
2112 fp->hdr.type = BINDER_TYPE_BINDER;
2114 fp->hdr.type = BINDER_TYPE_WEAK_BINDER;
2115 fp->binder = node->ptr;
2116 fp->cookie = node->cookie;
2118 binder_inner_proc_lock(node->proc);
2120 __acquire(&node->proc->inner_lock);
2121 binder_inc_node_nilocked(node,
2122 fp->hdr.type == BINDER_TYPE_BINDER,
2125 binder_inner_proc_unlock(node->proc);
2127 __release(&node->proc->inner_lock);
2128 trace_binder_transaction_ref_to_node(t, node, &src_rdata);
2129 binder_debug(BINDER_DEBUG_TRANSACTION,
2130 " ref %d desc %d -> node %d u%016llx\n",
2131 src_rdata.debug_id, src_rdata.desc, node->debug_id,
2133 binder_node_unlock(node);
2135 struct binder_ref_data dest_rdata;
2137 binder_node_unlock(node);
2138 ret = binder_inc_ref_for_node(target_proc, node,
2139 fp->hdr.type == BINDER_TYPE_HANDLE,
2145 fp->handle = dest_rdata.desc;
2147 trace_binder_transaction_ref_to_ref(t, node, &src_rdata,
2149 binder_debug(BINDER_DEBUG_TRANSACTION,
2150 " ref %d desc %d -> ref %d desc %d (node %d)\n",
2151 src_rdata.debug_id, src_rdata.desc,
2152 dest_rdata.debug_id, dest_rdata.desc,
2156 binder_put_node(node);
2160 static int binder_translate_fd(u32 fd, binder_size_t fd_offset,
2161 struct binder_transaction *t,
2162 struct binder_thread *thread,
2163 struct binder_transaction *in_reply_to)
2165 struct binder_proc *proc = thread->proc;
2166 struct binder_proc *target_proc = t->to_proc;
2167 struct binder_txn_fd_fixup *fixup;
2170 bool target_allows_fd;
2173 target_allows_fd = !!(in_reply_to->flags & TF_ACCEPT_FDS);
2175 target_allows_fd = t->buffer->target_node->accept_fds;
2176 if (!target_allows_fd) {
2177 binder_user_error("%d:%d got %s with fd, %d, but target does not allow fds\n",
2178 proc->pid, thread->pid,
2179 in_reply_to ? "reply" : "transaction",
2182 goto err_fd_not_accepted;
2187 binder_user_error("%d:%d got transaction with invalid fd, %d\n",
2188 proc->pid, thread->pid, fd);
2192 ret = security_binder_transfer_file(proc->cred, target_proc->cred, file);
2199 * Add fixup record for this transaction. The allocation
2200 * of the fd in the target needs to be done from a
2203 fixup = kzalloc(sizeof(*fixup), GFP_KERNEL);
2209 fixup->offset = fd_offset;
2210 trace_binder_transaction_fd_send(t, fd, fixup->offset);
2211 list_add_tail(&fixup->fixup_entry, &t->fd_fixups);
2219 err_fd_not_accepted:
2223 static int binder_translate_fd_array(struct binder_fd_array_object *fda,
2224 struct binder_buffer_object *parent,
2225 struct binder_transaction *t,
2226 struct binder_thread *thread,
2227 struct binder_transaction *in_reply_to)
2229 binder_size_t fdi, fd_buf_size;
2230 binder_size_t fda_offset;
2231 struct binder_proc *proc = thread->proc;
2232 struct binder_proc *target_proc = t->to_proc;
2234 fd_buf_size = sizeof(u32) * fda->num_fds;
2235 if (fda->num_fds >= SIZE_MAX / sizeof(u32)) {
2236 binder_user_error("%d:%d got transaction with invalid number of fds (%lld)\n",
2237 proc->pid, thread->pid, (u64)fda->num_fds);
2240 if (fd_buf_size > parent->length ||
2241 fda->parent_offset > parent->length - fd_buf_size) {
2242 /* No space for all file descriptors here. */
2243 binder_user_error("%d:%d not enough space to store %lld fds in buffer\n",
2244 proc->pid, thread->pid, (u64)fda->num_fds);
2248 * the source data for binder_buffer_object is visible
2249 * to user-space and the @buffer element is the user
2250 * pointer to the buffer_object containing the fd_array.
2251 * Convert the address to an offset relative to
2252 * the base of the transaction buffer.
2254 fda_offset = (parent->buffer - (uintptr_t)t->buffer->user_data) +
2256 if (!IS_ALIGNED((unsigned long)fda_offset, sizeof(u32))) {
2257 binder_user_error("%d:%d parent offset not aligned correctly.\n",
2258 proc->pid, thread->pid);
2261 for (fdi = 0; fdi < fda->num_fds; fdi++) {
2264 binder_size_t offset = fda_offset + fdi * sizeof(fd);
2266 ret = binder_alloc_copy_from_buffer(&target_proc->alloc,
2268 offset, sizeof(fd));
2270 ret = binder_translate_fd(fd, offset, t, thread,
2278 static int binder_fixup_parent(struct binder_transaction *t,
2279 struct binder_thread *thread,
2280 struct binder_buffer_object *bp,
2281 binder_size_t off_start_offset,
2282 binder_size_t num_valid,
2283 binder_size_t last_fixup_obj_off,
2284 binder_size_t last_fixup_min_off)
2286 struct binder_buffer_object *parent;
2287 struct binder_buffer *b = t->buffer;
2288 struct binder_proc *proc = thread->proc;
2289 struct binder_proc *target_proc = t->to_proc;
2290 struct binder_object object;
2291 binder_size_t buffer_offset;
2292 binder_size_t parent_offset;
2294 if (!(bp->flags & BINDER_BUFFER_FLAG_HAS_PARENT))
2297 parent = binder_validate_ptr(target_proc, b, &object, bp->parent,
2298 off_start_offset, &parent_offset,
2301 binder_user_error("%d:%d got transaction with invalid parent offset or type\n",
2302 proc->pid, thread->pid);
2306 if (!binder_validate_fixup(target_proc, b, off_start_offset,
2307 parent_offset, bp->parent_offset,
2309 last_fixup_min_off)) {
2310 binder_user_error("%d:%d got transaction with out-of-order buffer fixup\n",
2311 proc->pid, thread->pid);
2315 if (parent->length < sizeof(binder_uintptr_t) ||
2316 bp->parent_offset > parent->length - sizeof(binder_uintptr_t)) {
2317 /* No space for a pointer here! */
2318 binder_user_error("%d:%d got transaction with invalid parent offset\n",
2319 proc->pid, thread->pid);
2322 buffer_offset = bp->parent_offset +
2323 (uintptr_t)parent->buffer - (uintptr_t)b->user_data;
2324 if (binder_alloc_copy_to_buffer(&target_proc->alloc, b, buffer_offset,
2325 &bp->buffer, sizeof(bp->buffer))) {
2326 binder_user_error("%d:%d got transaction with invalid parent offset\n",
2327 proc->pid, thread->pid);
2335 * binder_proc_transaction() - sends a transaction to a process and wakes it up
2336 * @t: transaction to send
2337 * @proc: process to send the transaction to
2338 * @thread: thread in @proc to send the transaction to (may be NULL)
2340 * This function queues a transaction to the specified process. It will try
2341 * to find a thread in the target process to handle the transaction and
2342 * wake it up. If no thread is found, the work is queued to the proc
2345 * If the @thread parameter is not NULL, the transaction is always queued
2346 * to the waitlist of that specific thread.
2348 * Return: 0 if the transaction was successfully queued
2349 * BR_DEAD_REPLY if the target process or thread is dead
2350 * BR_FROZEN_REPLY if the target process or thread is frozen
2352 static int binder_proc_transaction(struct binder_transaction *t,
2353 struct binder_proc *proc,
2354 struct binder_thread *thread)
2356 struct binder_node *node = t->buffer->target_node;
2357 bool oneway = !!(t->flags & TF_ONE_WAY);
2358 bool pending_async = false;
2361 binder_node_lock(node);
2364 if (node->has_async_transaction)
2365 pending_async = true;
2367 node->has_async_transaction = true;
2370 binder_inner_proc_lock(proc);
2371 if (proc->is_frozen) {
2372 proc->sync_recv |= !oneway;
2373 proc->async_recv |= oneway;
2376 if ((proc->is_frozen && !oneway) || proc->is_dead ||
2377 (thread && thread->is_dead)) {
2378 binder_inner_proc_unlock(proc);
2379 binder_node_unlock(node);
2380 return proc->is_frozen ? BR_FROZEN_REPLY : BR_DEAD_REPLY;
2383 if (!thread && !pending_async)
2384 thread = binder_select_thread_ilocked(proc);
2387 binder_enqueue_thread_work_ilocked(thread, &t->work);
2388 else if (!pending_async)
2389 binder_enqueue_work_ilocked(&t->work, &proc->todo);
2391 binder_enqueue_work_ilocked(&t->work, &node->async_todo);
2394 binder_wakeup_thread_ilocked(proc, thread, !oneway /* sync */);
2396 proc->outstanding_txns++;
2397 binder_inner_proc_unlock(proc);
2398 binder_node_unlock(node);
2404 * binder_get_node_refs_for_txn() - Get required refs on node for txn
2405 * @node: struct binder_node for which to get refs
2406 * @proc: returns @node->proc if valid
2407 * @error: if no @proc then returns BR_DEAD_REPLY
2409 * User-space normally keeps the node alive when creating a transaction
2410 * since it has a reference to the target. The local strong ref keeps it
2411 * alive if the sending process dies before the target process processes
2412 * the transaction. If the source process is malicious or has a reference
2413 * counting bug, relying on the local strong ref can fail.
2415 * Since user-space can cause the local strong ref to go away, we also take
2416 * a tmpref on the node to ensure it survives while we are constructing
2417 * the transaction. We also need a tmpref on the proc while we are
2418 * constructing the transaction, so we take that here as well.
2420 * Return: The target_node with refs taken or NULL if no @node->proc is NULL.
2421 * Also sets @proc if valid. If the @node->proc is NULL indicating that the
2422 * target proc has died, @error is set to BR_DEAD_REPLY
2424 static struct binder_node *binder_get_node_refs_for_txn(
2425 struct binder_node *node,
2426 struct binder_proc **procp,
2429 struct binder_node *target_node = NULL;
2431 binder_node_inner_lock(node);
2434 binder_inc_node_nilocked(node, 1, 0, NULL);
2435 binder_inc_node_tmpref_ilocked(node);
2436 node->proc->tmp_ref++;
2437 *procp = node->proc;
2439 *error = BR_DEAD_REPLY;
2440 binder_node_inner_unlock(node);
2445 static void binder_transaction(struct binder_proc *proc,
2446 struct binder_thread *thread,
2447 struct binder_transaction_data *tr, int reply,
2448 binder_size_t extra_buffers_size)
2451 struct binder_transaction *t;
2452 struct binder_work *w;
2453 struct binder_work *tcomplete;
2454 binder_size_t buffer_offset = 0;
2455 binder_size_t off_start_offset, off_end_offset;
2456 binder_size_t off_min;
2457 binder_size_t sg_buf_offset, sg_buf_end_offset;
2458 struct binder_proc *target_proc = NULL;
2459 struct binder_thread *target_thread = NULL;
2460 struct binder_node *target_node = NULL;
2461 struct binder_transaction *in_reply_to = NULL;
2462 struct binder_transaction_log_entry *e;
2463 uint32_t return_error = 0;
2464 uint32_t return_error_param = 0;
2465 uint32_t return_error_line = 0;
2466 binder_size_t last_fixup_obj_off = 0;
2467 binder_size_t last_fixup_min_off = 0;
2468 struct binder_context *context = proc->context;
2469 int t_debug_id = atomic_inc_return(&binder_last_id);
2470 char *secctx = NULL;
2473 e = binder_transaction_log_add(&binder_transaction_log);
2474 e->debug_id = t_debug_id;
2475 e->call_type = reply ? 2 : !!(tr->flags & TF_ONE_WAY);
2476 e->from_proc = proc->pid;
2477 e->from_thread = thread->pid;
2478 e->target_handle = tr->target.handle;
2479 e->data_size = tr->data_size;
2480 e->offsets_size = tr->offsets_size;
2481 strscpy(e->context_name, proc->context->name, BINDERFS_MAX_NAME);
2484 binder_inner_proc_lock(proc);
2485 in_reply_to = thread->transaction_stack;
2486 if (in_reply_to == NULL) {
2487 binder_inner_proc_unlock(proc);
2488 binder_user_error("%d:%d got reply transaction with no transaction stack\n",
2489 proc->pid, thread->pid);
2490 return_error = BR_FAILED_REPLY;
2491 return_error_param = -EPROTO;
2492 return_error_line = __LINE__;
2493 goto err_empty_call_stack;
2495 if (in_reply_to->to_thread != thread) {
2496 spin_lock(&in_reply_to->lock);
2497 binder_user_error("%d:%d got reply transaction with bad transaction stack, transaction %d has target %d:%d\n",
2498 proc->pid, thread->pid, in_reply_to->debug_id,
2499 in_reply_to->to_proc ?
2500 in_reply_to->to_proc->pid : 0,
2501 in_reply_to->to_thread ?
2502 in_reply_to->to_thread->pid : 0);
2503 spin_unlock(&in_reply_to->lock);
2504 binder_inner_proc_unlock(proc);
2505 return_error = BR_FAILED_REPLY;
2506 return_error_param = -EPROTO;
2507 return_error_line = __LINE__;
2509 goto err_bad_call_stack;
2511 thread->transaction_stack = in_reply_to->to_parent;
2512 binder_inner_proc_unlock(proc);
2513 binder_set_nice(in_reply_to->saved_priority);
2514 target_thread = binder_get_txn_from_and_acq_inner(in_reply_to);
2515 if (target_thread == NULL) {
2516 /* annotation for sparse */
2517 __release(&target_thread->proc->inner_lock);
2518 return_error = BR_DEAD_REPLY;
2519 return_error_line = __LINE__;
2520 goto err_dead_binder;
2522 if (target_thread->transaction_stack != in_reply_to) {
2523 binder_user_error("%d:%d got reply transaction with bad target transaction stack %d, expected %d\n",
2524 proc->pid, thread->pid,
2525 target_thread->transaction_stack ?
2526 target_thread->transaction_stack->debug_id : 0,
2527 in_reply_to->debug_id);
2528 binder_inner_proc_unlock(target_thread->proc);
2529 return_error = BR_FAILED_REPLY;
2530 return_error_param = -EPROTO;
2531 return_error_line = __LINE__;
2533 target_thread = NULL;
2534 goto err_dead_binder;
2536 target_proc = target_thread->proc;
2537 target_proc->tmp_ref++;
2538 binder_inner_proc_unlock(target_thread->proc);
2540 if (tr->target.handle) {
2541 struct binder_ref *ref;
2544 * There must already be a strong ref
2545 * on this node. If so, do a strong
2546 * increment on the node to ensure it
2547 * stays alive until the transaction is
2550 binder_proc_lock(proc);
2551 ref = binder_get_ref_olocked(proc, tr->target.handle,
2554 target_node = binder_get_node_refs_for_txn(
2555 ref->node, &target_proc,
2558 binder_user_error("%d:%d got transaction to invalid handle, %u\n",
2559 proc->pid, thread->pid, tr->target.handle);
2560 return_error = BR_FAILED_REPLY;
2562 binder_proc_unlock(proc);
2564 mutex_lock(&context->context_mgr_node_lock);
2565 target_node = context->binder_context_mgr_node;
2567 target_node = binder_get_node_refs_for_txn(
2568 target_node, &target_proc,
2571 return_error = BR_DEAD_REPLY;
2572 mutex_unlock(&context->context_mgr_node_lock);
2573 if (target_node && target_proc->pid == proc->pid) {
2574 binder_user_error("%d:%d got transaction to context manager from process owning it\n",
2575 proc->pid, thread->pid);
2576 return_error = BR_FAILED_REPLY;
2577 return_error_param = -EINVAL;
2578 return_error_line = __LINE__;
2579 goto err_invalid_target_handle;
2584 * return_error is set above
2586 return_error_param = -EINVAL;
2587 return_error_line = __LINE__;
2588 goto err_dead_binder;
2590 e->to_node = target_node->debug_id;
2591 if (WARN_ON(proc == target_proc)) {
2592 return_error = BR_FAILED_REPLY;
2593 return_error_param = -EINVAL;
2594 return_error_line = __LINE__;
2595 goto err_invalid_target_handle;
2597 if (security_binder_transaction(proc->cred,
2598 target_proc->cred) < 0) {
2599 return_error = BR_FAILED_REPLY;
2600 return_error_param = -EPERM;
2601 return_error_line = __LINE__;
2602 goto err_invalid_target_handle;
2604 binder_inner_proc_lock(proc);
2606 w = list_first_entry_or_null(&thread->todo,
2607 struct binder_work, entry);
2608 if (!(tr->flags & TF_ONE_WAY) && w &&
2609 w->type == BINDER_WORK_TRANSACTION) {
2611 * Do not allow new outgoing transaction from a
2612 * thread that has a transaction at the head of
2613 * its todo list. Only need to check the head
2614 * because binder_select_thread_ilocked picks a
2615 * thread from proc->waiting_threads to enqueue
2616 * the transaction, and nothing is queued to the
2617 * todo list while the thread is on waiting_threads.
2619 binder_user_error("%d:%d new transaction not allowed when there is a transaction on thread todo\n",
2620 proc->pid, thread->pid);
2621 binder_inner_proc_unlock(proc);
2622 return_error = BR_FAILED_REPLY;
2623 return_error_param = -EPROTO;
2624 return_error_line = __LINE__;
2625 goto err_bad_todo_list;
2628 if (!(tr->flags & TF_ONE_WAY) && thread->transaction_stack) {
2629 struct binder_transaction *tmp;
2631 tmp = thread->transaction_stack;
2632 if (tmp->to_thread != thread) {
2633 spin_lock(&tmp->lock);
2634 binder_user_error("%d:%d got new transaction with bad transaction stack, transaction %d has target %d:%d\n",
2635 proc->pid, thread->pid, tmp->debug_id,
2636 tmp->to_proc ? tmp->to_proc->pid : 0,
2638 tmp->to_thread->pid : 0);
2639 spin_unlock(&tmp->lock);
2640 binder_inner_proc_unlock(proc);
2641 return_error = BR_FAILED_REPLY;
2642 return_error_param = -EPROTO;
2643 return_error_line = __LINE__;
2644 goto err_bad_call_stack;
2647 struct binder_thread *from;
2649 spin_lock(&tmp->lock);
2651 if (from && from->proc == target_proc) {
2652 atomic_inc(&from->tmp_ref);
2653 target_thread = from;
2654 spin_unlock(&tmp->lock);
2657 spin_unlock(&tmp->lock);
2658 tmp = tmp->from_parent;
2661 binder_inner_proc_unlock(proc);
2664 e->to_thread = target_thread->pid;
2665 e->to_proc = target_proc->pid;
2667 /* TODO: reuse incoming transaction for reply */
2668 t = kzalloc(sizeof(*t), GFP_KERNEL);
2670 return_error = BR_FAILED_REPLY;
2671 return_error_param = -ENOMEM;
2672 return_error_line = __LINE__;
2673 goto err_alloc_t_failed;
2675 INIT_LIST_HEAD(&t->fd_fixups);
2676 binder_stats_created(BINDER_STAT_TRANSACTION);
2677 spin_lock_init(&t->lock);
2679 tcomplete = kzalloc(sizeof(*tcomplete), GFP_KERNEL);
2680 if (tcomplete == NULL) {
2681 return_error = BR_FAILED_REPLY;
2682 return_error_param = -ENOMEM;
2683 return_error_line = __LINE__;
2684 goto err_alloc_tcomplete_failed;
2686 binder_stats_created(BINDER_STAT_TRANSACTION_COMPLETE);
2688 t->debug_id = t_debug_id;
2691 binder_debug(BINDER_DEBUG_TRANSACTION,
2692 "%d:%d BC_REPLY %d -> %d:%d, data %016llx-%016llx size %lld-%lld-%lld\n",
2693 proc->pid, thread->pid, t->debug_id,
2694 target_proc->pid, target_thread->pid,
2695 (u64)tr->data.ptr.buffer,
2696 (u64)tr->data.ptr.offsets,
2697 (u64)tr->data_size, (u64)tr->offsets_size,
2698 (u64)extra_buffers_size);
2700 binder_debug(BINDER_DEBUG_TRANSACTION,
2701 "%d:%d BC_TRANSACTION %d -> %d - node %d, data %016llx-%016llx size %lld-%lld-%lld\n",
2702 proc->pid, thread->pid, t->debug_id,
2703 target_proc->pid, target_node->debug_id,
2704 (u64)tr->data.ptr.buffer,
2705 (u64)tr->data.ptr.offsets,
2706 (u64)tr->data_size, (u64)tr->offsets_size,
2707 (u64)extra_buffers_size);
2709 if (!reply && !(tr->flags & TF_ONE_WAY))
2713 t->sender_euid = proc->cred->euid;
2714 t->to_proc = target_proc;
2715 t->to_thread = target_thread;
2717 t->flags = tr->flags;
2718 t->priority = task_nice(current);
2720 if (target_node && target_node->txn_security_ctx) {
2724 security_cred_getsecid(proc->cred, &secid);
2725 ret = security_secid_to_secctx(secid, &secctx, &secctx_sz);
2727 return_error = BR_FAILED_REPLY;
2728 return_error_param = ret;
2729 return_error_line = __LINE__;
2730 goto err_get_secctx_failed;
2732 added_size = ALIGN(secctx_sz, sizeof(u64));
2733 extra_buffers_size += added_size;
2734 if (extra_buffers_size < added_size) {
2735 /* integer overflow of extra_buffers_size */
2736 return_error = BR_FAILED_REPLY;
2737 return_error_param = -EINVAL;
2738 return_error_line = __LINE__;
2739 goto err_bad_extra_size;
2743 trace_binder_transaction(reply, t, target_node);
2745 t->buffer = binder_alloc_new_buf(&target_proc->alloc, tr->data_size,
2746 tr->offsets_size, extra_buffers_size,
2747 !reply && (t->flags & TF_ONE_WAY), current->tgid);
2748 if (IS_ERR(t->buffer)) {
2750 * -ESRCH indicates VMA cleared. The target is dying.
2752 return_error_param = PTR_ERR(t->buffer);
2753 return_error = return_error_param == -ESRCH ?
2754 BR_DEAD_REPLY : BR_FAILED_REPLY;
2755 return_error_line = __LINE__;
2757 goto err_binder_alloc_buf_failed;
2761 size_t buf_offset = ALIGN(tr->data_size, sizeof(void *)) +
2762 ALIGN(tr->offsets_size, sizeof(void *)) +
2763 ALIGN(extra_buffers_size, sizeof(void *)) -
2764 ALIGN(secctx_sz, sizeof(u64));
2766 t->security_ctx = (uintptr_t)t->buffer->user_data + buf_offset;
2767 err = binder_alloc_copy_to_buffer(&target_proc->alloc,
2768 t->buffer, buf_offset,
2771 t->security_ctx = 0;
2774 security_release_secctx(secctx, secctx_sz);
2777 t->buffer->debug_id = t->debug_id;
2778 t->buffer->transaction = t;
2779 t->buffer->target_node = target_node;
2780 t->buffer->clear_on_free = !!(t->flags & TF_CLEAR_BUF);
2781 trace_binder_transaction_alloc_buf(t->buffer);
2783 if (binder_alloc_copy_user_to_buffer(
2784 &target_proc->alloc,
2786 (const void __user *)
2787 (uintptr_t)tr->data.ptr.buffer,
2789 binder_user_error("%d:%d got transaction with invalid data ptr\n",
2790 proc->pid, thread->pid);
2791 return_error = BR_FAILED_REPLY;
2792 return_error_param = -EFAULT;
2793 return_error_line = __LINE__;
2794 goto err_copy_data_failed;
2796 if (binder_alloc_copy_user_to_buffer(
2797 &target_proc->alloc,
2799 ALIGN(tr->data_size, sizeof(void *)),
2800 (const void __user *)
2801 (uintptr_t)tr->data.ptr.offsets,
2802 tr->offsets_size)) {
2803 binder_user_error("%d:%d got transaction with invalid offsets ptr\n",
2804 proc->pid, thread->pid);
2805 return_error = BR_FAILED_REPLY;
2806 return_error_param = -EFAULT;
2807 return_error_line = __LINE__;
2808 goto err_copy_data_failed;
2810 if (!IS_ALIGNED(tr->offsets_size, sizeof(binder_size_t))) {
2811 binder_user_error("%d:%d got transaction with invalid offsets size, %lld\n",
2812 proc->pid, thread->pid, (u64)tr->offsets_size);
2813 return_error = BR_FAILED_REPLY;
2814 return_error_param = -EINVAL;
2815 return_error_line = __LINE__;
2816 goto err_bad_offset;
2818 if (!IS_ALIGNED(extra_buffers_size, sizeof(u64))) {
2819 binder_user_error("%d:%d got transaction with unaligned buffers size, %lld\n",
2820 proc->pid, thread->pid,
2821 (u64)extra_buffers_size);
2822 return_error = BR_FAILED_REPLY;
2823 return_error_param = -EINVAL;
2824 return_error_line = __LINE__;
2825 goto err_bad_offset;
2827 off_start_offset = ALIGN(tr->data_size, sizeof(void *));
2828 buffer_offset = off_start_offset;
2829 off_end_offset = off_start_offset + tr->offsets_size;
2830 sg_buf_offset = ALIGN(off_end_offset, sizeof(void *));
2831 sg_buf_end_offset = sg_buf_offset + extra_buffers_size -
2832 ALIGN(secctx_sz, sizeof(u64));
2834 for (buffer_offset = off_start_offset; buffer_offset < off_end_offset;
2835 buffer_offset += sizeof(binder_size_t)) {
2836 struct binder_object_header *hdr;
2838 struct binder_object object;
2839 binder_size_t object_offset;
2841 if (binder_alloc_copy_from_buffer(&target_proc->alloc,
2845 sizeof(object_offset))) {
2846 return_error = BR_FAILED_REPLY;
2847 return_error_param = -EINVAL;
2848 return_error_line = __LINE__;
2849 goto err_bad_offset;
2851 object_size = binder_get_object(target_proc, t->buffer,
2852 object_offset, &object);
2853 if (object_size == 0 || object_offset < off_min) {
2854 binder_user_error("%d:%d got transaction with invalid offset (%lld, min %lld max %lld) or object.\n",
2855 proc->pid, thread->pid,
2858 (u64)t->buffer->data_size);
2859 return_error = BR_FAILED_REPLY;
2860 return_error_param = -EINVAL;
2861 return_error_line = __LINE__;
2862 goto err_bad_offset;
2866 off_min = object_offset + object_size;
2867 switch (hdr->type) {
2868 case BINDER_TYPE_BINDER:
2869 case BINDER_TYPE_WEAK_BINDER: {
2870 struct flat_binder_object *fp;
2872 fp = to_flat_binder_object(hdr);
2873 ret = binder_translate_binder(fp, t, thread);
2876 binder_alloc_copy_to_buffer(&target_proc->alloc,
2880 return_error = BR_FAILED_REPLY;
2881 return_error_param = ret;
2882 return_error_line = __LINE__;
2883 goto err_translate_failed;
2886 case BINDER_TYPE_HANDLE:
2887 case BINDER_TYPE_WEAK_HANDLE: {
2888 struct flat_binder_object *fp;
2890 fp = to_flat_binder_object(hdr);
2891 ret = binder_translate_handle(fp, t, thread);
2893 binder_alloc_copy_to_buffer(&target_proc->alloc,
2897 return_error = BR_FAILED_REPLY;
2898 return_error_param = ret;
2899 return_error_line = __LINE__;
2900 goto err_translate_failed;
2904 case BINDER_TYPE_FD: {
2905 struct binder_fd_object *fp = to_binder_fd_object(hdr);
2906 binder_size_t fd_offset = object_offset +
2907 (uintptr_t)&fp->fd - (uintptr_t)fp;
2908 int ret = binder_translate_fd(fp->fd, fd_offset, t,
2909 thread, in_reply_to);
2913 binder_alloc_copy_to_buffer(&target_proc->alloc,
2917 return_error = BR_FAILED_REPLY;
2918 return_error_param = ret;
2919 return_error_line = __LINE__;
2920 goto err_translate_failed;
2923 case BINDER_TYPE_FDA: {
2924 struct binder_object ptr_object;
2925 binder_size_t parent_offset;
2926 struct binder_fd_array_object *fda =
2927 to_binder_fd_array_object(hdr);
2928 size_t num_valid = (buffer_offset - off_start_offset) /
2929 sizeof(binder_size_t);
2930 struct binder_buffer_object *parent =
2931 binder_validate_ptr(target_proc, t->buffer,
2932 &ptr_object, fda->parent,
2937 binder_user_error("%d:%d got transaction with invalid parent offset or type\n",
2938 proc->pid, thread->pid);
2939 return_error = BR_FAILED_REPLY;
2940 return_error_param = -EINVAL;
2941 return_error_line = __LINE__;
2942 goto err_bad_parent;
2944 if (!binder_validate_fixup(target_proc, t->buffer,
2949 last_fixup_min_off)) {
2950 binder_user_error("%d:%d got transaction with out-of-order buffer fixup\n",
2951 proc->pid, thread->pid);
2952 return_error = BR_FAILED_REPLY;
2953 return_error_param = -EINVAL;
2954 return_error_line = __LINE__;
2955 goto err_bad_parent;
2957 ret = binder_translate_fd_array(fda, parent, t, thread,
2960 return_error = BR_FAILED_REPLY;
2961 return_error_param = ret;
2962 return_error_line = __LINE__;
2963 goto err_translate_failed;
2965 last_fixup_obj_off = parent_offset;
2966 last_fixup_min_off =
2967 fda->parent_offset + sizeof(u32) * fda->num_fds;
2969 case BINDER_TYPE_PTR: {
2970 struct binder_buffer_object *bp =
2971 to_binder_buffer_object(hdr);
2972 size_t buf_left = sg_buf_end_offset - sg_buf_offset;
2975 if (bp->length > buf_left) {
2976 binder_user_error("%d:%d got transaction with too large buffer\n",
2977 proc->pid, thread->pid);
2978 return_error = BR_FAILED_REPLY;
2979 return_error_param = -EINVAL;
2980 return_error_line = __LINE__;
2981 goto err_bad_offset;
2983 if (binder_alloc_copy_user_to_buffer(
2984 &target_proc->alloc,
2987 (const void __user *)
2988 (uintptr_t)bp->buffer,
2990 binder_user_error("%d:%d got transaction with invalid offsets ptr\n",
2991 proc->pid, thread->pid);
2992 return_error_param = -EFAULT;
2993 return_error = BR_FAILED_REPLY;
2994 return_error_line = __LINE__;
2995 goto err_copy_data_failed;
2997 /* Fixup buffer pointer to target proc address space */
2998 bp->buffer = (uintptr_t)
2999 t->buffer->user_data + sg_buf_offset;
3000 sg_buf_offset += ALIGN(bp->length, sizeof(u64));
3002 num_valid = (buffer_offset - off_start_offset) /
3003 sizeof(binder_size_t);
3004 ret = binder_fixup_parent(t, thread, bp,
3008 last_fixup_min_off);
3010 binder_alloc_copy_to_buffer(&target_proc->alloc,
3014 return_error = BR_FAILED_REPLY;
3015 return_error_param = ret;
3016 return_error_line = __LINE__;
3017 goto err_translate_failed;
3019 last_fixup_obj_off = object_offset;
3020 last_fixup_min_off = 0;
3023 binder_user_error("%d:%d got transaction with invalid object type, %x\n",
3024 proc->pid, thread->pid, hdr->type);
3025 return_error = BR_FAILED_REPLY;
3026 return_error_param = -EINVAL;
3027 return_error_line = __LINE__;
3028 goto err_bad_object_type;
3031 if (t->buffer->oneway_spam_suspect)
3032 tcomplete->type = BINDER_WORK_TRANSACTION_ONEWAY_SPAM_SUSPECT;
3034 tcomplete->type = BINDER_WORK_TRANSACTION_COMPLETE;
3035 t->work.type = BINDER_WORK_TRANSACTION;
3038 binder_enqueue_thread_work(thread, tcomplete);
3039 binder_inner_proc_lock(target_proc);
3040 if (target_thread->is_dead) {
3041 return_error = BR_DEAD_REPLY;
3042 binder_inner_proc_unlock(target_proc);
3043 goto err_dead_proc_or_thread;
3045 BUG_ON(t->buffer->async_transaction != 0);
3046 binder_pop_transaction_ilocked(target_thread, in_reply_to);
3047 binder_enqueue_thread_work_ilocked(target_thread, &t->work);
3048 target_proc->outstanding_txns++;
3049 binder_inner_proc_unlock(target_proc);
3050 wake_up_interruptible_sync(&target_thread->wait);
3051 binder_free_transaction(in_reply_to);
3052 } else if (!(t->flags & TF_ONE_WAY)) {
3053 BUG_ON(t->buffer->async_transaction != 0);
3054 binder_inner_proc_lock(proc);
3056 * Defer the TRANSACTION_COMPLETE, so we don't return to
3057 * userspace immediately; this allows the target process to
3058 * immediately start processing this transaction, reducing
3059 * latency. We will then return the TRANSACTION_COMPLETE when
3060 * the target replies (or there is an error).
3062 binder_enqueue_deferred_thread_work_ilocked(thread, tcomplete);
3064 t->from_parent = thread->transaction_stack;
3065 thread->transaction_stack = t;
3066 binder_inner_proc_unlock(proc);
3067 return_error = binder_proc_transaction(t,
3068 target_proc, target_thread);
3070 binder_inner_proc_lock(proc);
3071 binder_pop_transaction_ilocked(thread, t);
3072 binder_inner_proc_unlock(proc);
3073 goto err_dead_proc_or_thread;
3076 BUG_ON(target_node == NULL);
3077 BUG_ON(t->buffer->async_transaction != 1);
3078 binder_enqueue_thread_work(thread, tcomplete);
3079 return_error = binder_proc_transaction(t, target_proc, NULL);
3081 goto err_dead_proc_or_thread;
3084 binder_thread_dec_tmpref(target_thread);
3085 binder_proc_dec_tmpref(target_proc);
3087 binder_dec_node_tmpref(target_node);
3089 * write barrier to synchronize with initialization
3093 WRITE_ONCE(e->debug_id_done, t_debug_id);
3096 err_dead_proc_or_thread:
3097 return_error_line = __LINE__;
3098 binder_dequeue_work(proc, tcomplete);
3099 err_translate_failed:
3100 err_bad_object_type:
3103 err_copy_data_failed:
3104 binder_free_txn_fixups(t);
3105 trace_binder_transaction_failed_buffer_release(t->buffer);
3106 binder_transaction_buffer_release(target_proc, NULL, t->buffer,
3107 buffer_offset, true);
3109 binder_dec_node_tmpref(target_node);
3111 t->buffer->transaction = NULL;
3112 binder_alloc_free_buf(&target_proc->alloc, t->buffer);
3113 err_binder_alloc_buf_failed:
3116 security_release_secctx(secctx, secctx_sz);
3117 err_get_secctx_failed:
3119 binder_stats_deleted(BINDER_STAT_TRANSACTION_COMPLETE);
3120 err_alloc_tcomplete_failed:
3121 if (trace_binder_txn_latency_free_enabled())
3122 binder_txn_latency_free(t);
3124 binder_stats_deleted(BINDER_STAT_TRANSACTION);
3128 err_empty_call_stack:
3130 err_invalid_target_handle:
3132 binder_thread_dec_tmpref(target_thread);
3134 binder_proc_dec_tmpref(target_proc);
3136 binder_dec_node(target_node, 1, 0);
3137 binder_dec_node_tmpref(target_node);
3140 binder_debug(BINDER_DEBUG_FAILED_TRANSACTION,
3141 "%d:%d transaction failed %d/%d, size %lld-%lld line %d\n",
3142 proc->pid, thread->pid, return_error, return_error_param,
3143 (u64)tr->data_size, (u64)tr->offsets_size,
3147 struct binder_transaction_log_entry *fe;
3149 e->return_error = return_error;
3150 e->return_error_param = return_error_param;
3151 e->return_error_line = return_error_line;
3152 fe = binder_transaction_log_add(&binder_transaction_log_failed);
3155 * write barrier to synchronize with initialization
3159 WRITE_ONCE(e->debug_id_done, t_debug_id);
3160 WRITE_ONCE(fe->debug_id_done, t_debug_id);
3163 BUG_ON(thread->return_error.cmd != BR_OK);
3165 thread->return_error.cmd = BR_TRANSACTION_COMPLETE;
3166 binder_enqueue_thread_work(thread, &thread->return_error.work);
3167 binder_send_failed_reply(in_reply_to, return_error);
3169 thread->return_error.cmd = return_error;
3170 binder_enqueue_thread_work(thread, &thread->return_error.work);
3175 * binder_free_buf() - free the specified buffer
3176 * @proc: binder proc that owns buffer
3177 * @buffer: buffer to be freed
3178 * @is_failure: failed to send transaction
3180 * If buffer for an async transaction, enqueue the next async
3181 * transaction from the node.
3183 * Cleanup buffer and free it.
3186 binder_free_buf(struct binder_proc *proc,
3187 struct binder_thread *thread,
3188 struct binder_buffer *buffer, bool is_failure)
3190 binder_inner_proc_lock(proc);
3191 if (buffer->transaction) {
3192 buffer->transaction->buffer = NULL;
3193 buffer->transaction = NULL;
3195 binder_inner_proc_unlock(proc);
3196 if (buffer->async_transaction && buffer->target_node) {
3197 struct binder_node *buf_node;
3198 struct binder_work *w;
3200 buf_node = buffer->target_node;
3201 binder_node_inner_lock(buf_node);
3202 BUG_ON(!buf_node->has_async_transaction);
3203 BUG_ON(buf_node->proc != proc);
3204 w = binder_dequeue_work_head_ilocked(
3205 &buf_node->async_todo);
3207 buf_node->has_async_transaction = false;
3209 binder_enqueue_work_ilocked(
3211 binder_wakeup_proc_ilocked(proc);
3213 binder_node_inner_unlock(buf_node);
3215 trace_binder_transaction_buffer_release(buffer);
3216 binder_transaction_buffer_release(proc, thread, buffer, 0, is_failure);
3217 binder_alloc_free_buf(&proc->alloc, buffer);
3220 static int binder_thread_write(struct binder_proc *proc,
3221 struct binder_thread *thread,
3222 binder_uintptr_t binder_buffer, size_t size,
3223 binder_size_t *consumed)
3226 struct binder_context *context = proc->context;
3227 void __user *buffer = (void __user *)(uintptr_t)binder_buffer;
3228 void __user *ptr = buffer + *consumed;
3229 void __user *end = buffer + size;
3231 while (ptr < end && thread->return_error.cmd == BR_OK) {
3234 if (get_user(cmd, (uint32_t __user *)ptr))
3236 ptr += sizeof(uint32_t);
3237 trace_binder_command(cmd);
3238 if (_IOC_NR(cmd) < ARRAY_SIZE(binder_stats.bc)) {
3239 atomic_inc(&binder_stats.bc[_IOC_NR(cmd)]);
3240 atomic_inc(&proc->stats.bc[_IOC_NR(cmd)]);
3241 atomic_inc(&thread->stats.bc[_IOC_NR(cmd)]);
3249 const char *debug_string;
3250 bool strong = cmd == BC_ACQUIRE || cmd == BC_RELEASE;
3251 bool increment = cmd == BC_INCREFS || cmd == BC_ACQUIRE;
3252 struct binder_ref_data rdata;
3254 if (get_user(target, (uint32_t __user *)ptr))
3257 ptr += sizeof(uint32_t);
3259 if (increment && !target) {
3260 struct binder_node *ctx_mgr_node;
3262 mutex_lock(&context->context_mgr_node_lock);
3263 ctx_mgr_node = context->binder_context_mgr_node;
3265 if (ctx_mgr_node->proc == proc) {
3266 binder_user_error("%d:%d context manager tried to acquire desc 0\n",
3267 proc->pid, thread->pid);
3268 mutex_unlock(&context->context_mgr_node_lock);
3271 ret = binder_inc_ref_for_node(
3273 strong, NULL, &rdata);
3275 mutex_unlock(&context->context_mgr_node_lock);
3278 ret = binder_update_ref_for_handle(
3279 proc, target, increment, strong,
3281 if (!ret && rdata.desc != target) {
3282 binder_user_error("%d:%d tried to acquire reference to desc %d, got %d instead\n",
3283 proc->pid, thread->pid,
3284 target, rdata.desc);
3288 debug_string = "IncRefs";
3291 debug_string = "Acquire";
3294 debug_string = "Release";
3298 debug_string = "DecRefs";
3302 binder_user_error("%d:%d %s %d refcount change on invalid ref %d ret %d\n",
3303 proc->pid, thread->pid, debug_string,
3304 strong, target, ret);
3307 binder_debug(BINDER_DEBUG_USER_REFS,
3308 "%d:%d %s ref %d desc %d s %d w %d\n",
3309 proc->pid, thread->pid, debug_string,
3310 rdata.debug_id, rdata.desc, rdata.strong,
3314 case BC_INCREFS_DONE:
3315 case BC_ACQUIRE_DONE: {
3316 binder_uintptr_t node_ptr;
3317 binder_uintptr_t cookie;
3318 struct binder_node *node;
3321 if (get_user(node_ptr, (binder_uintptr_t __user *)ptr))
3323 ptr += sizeof(binder_uintptr_t);
3324 if (get_user(cookie, (binder_uintptr_t __user *)ptr))
3326 ptr += sizeof(binder_uintptr_t);
3327 node = binder_get_node(proc, node_ptr);
3329 binder_user_error("%d:%d %s u%016llx no match\n",
3330 proc->pid, thread->pid,
3331 cmd == BC_INCREFS_DONE ?
3337 if (cookie != node->cookie) {
3338 binder_user_error("%d:%d %s u%016llx node %d cookie mismatch %016llx != %016llx\n",
3339 proc->pid, thread->pid,
3340 cmd == BC_INCREFS_DONE ?
3341 "BC_INCREFS_DONE" : "BC_ACQUIRE_DONE",
3342 (u64)node_ptr, node->debug_id,
3343 (u64)cookie, (u64)node->cookie);
3344 binder_put_node(node);
3347 binder_node_inner_lock(node);
3348 if (cmd == BC_ACQUIRE_DONE) {
3349 if (node->pending_strong_ref == 0) {
3350 binder_user_error("%d:%d BC_ACQUIRE_DONE node %d has no pending acquire request\n",
3351 proc->pid, thread->pid,
3353 binder_node_inner_unlock(node);
3354 binder_put_node(node);
3357 node->pending_strong_ref = 0;
3359 if (node->pending_weak_ref == 0) {
3360 binder_user_error("%d:%d BC_INCREFS_DONE node %d has no pending increfs request\n",
3361 proc->pid, thread->pid,
3363 binder_node_inner_unlock(node);
3364 binder_put_node(node);
3367 node->pending_weak_ref = 0;
3369 free_node = binder_dec_node_nilocked(node,
3370 cmd == BC_ACQUIRE_DONE, 0);
3372 binder_debug(BINDER_DEBUG_USER_REFS,
3373 "%d:%d %s node %d ls %d lw %d tr %d\n",
3374 proc->pid, thread->pid,
3375 cmd == BC_INCREFS_DONE ? "BC_INCREFS_DONE" : "BC_ACQUIRE_DONE",
3376 node->debug_id, node->local_strong_refs,
3377 node->local_weak_refs, node->tmp_refs);
3378 binder_node_inner_unlock(node);
3379 binder_put_node(node);
3382 case BC_ATTEMPT_ACQUIRE:
3383 pr_err("BC_ATTEMPT_ACQUIRE not supported\n");
3385 case BC_ACQUIRE_RESULT:
3386 pr_err("BC_ACQUIRE_RESULT not supported\n");
3389 case BC_FREE_BUFFER: {
3390 binder_uintptr_t data_ptr;
3391 struct binder_buffer *buffer;
3393 if (get_user(data_ptr, (binder_uintptr_t __user *)ptr))
3395 ptr += sizeof(binder_uintptr_t);
3397 buffer = binder_alloc_prepare_to_free(&proc->alloc,
3399 if (IS_ERR_OR_NULL(buffer)) {
3400 if (PTR_ERR(buffer) == -EPERM) {
3402 "%d:%d BC_FREE_BUFFER u%016llx matched unreturned or currently freeing buffer\n",
3403 proc->pid, thread->pid,
3407 "%d:%d BC_FREE_BUFFER u%016llx no match\n",
3408 proc->pid, thread->pid,
3413 binder_debug(BINDER_DEBUG_FREE_BUFFER,
3414 "%d:%d BC_FREE_BUFFER u%016llx found buffer %d for %s transaction\n",
3415 proc->pid, thread->pid, (u64)data_ptr,
3417 buffer->transaction ? "active" : "finished");
3418 binder_free_buf(proc, thread, buffer, false);
3422 case BC_TRANSACTION_SG:
3424 struct binder_transaction_data_sg tr;
3426 if (copy_from_user(&tr, ptr, sizeof(tr)))
3429 binder_transaction(proc, thread, &tr.transaction_data,
3430 cmd == BC_REPLY_SG, tr.buffers_size);
3433 case BC_TRANSACTION:
3435 struct binder_transaction_data tr;
3437 if (copy_from_user(&tr, ptr, sizeof(tr)))
3440 binder_transaction(proc, thread, &tr,
3441 cmd == BC_REPLY, 0);
3445 case BC_REGISTER_LOOPER:
3446 binder_debug(BINDER_DEBUG_THREADS,
3447 "%d:%d BC_REGISTER_LOOPER\n",
3448 proc->pid, thread->pid);
3449 binder_inner_proc_lock(proc);
3450 if (thread->looper & BINDER_LOOPER_STATE_ENTERED) {
3451 thread->looper |= BINDER_LOOPER_STATE_INVALID;
3452 binder_user_error("%d:%d ERROR: BC_REGISTER_LOOPER called after BC_ENTER_LOOPER\n",
3453 proc->pid, thread->pid);
3454 } else if (proc->requested_threads == 0) {
3455 thread->looper |= BINDER_LOOPER_STATE_INVALID;
3456 binder_user_error("%d:%d ERROR: BC_REGISTER_LOOPER called without request\n",
3457 proc->pid, thread->pid);
3459 proc->requested_threads--;
3460 proc->requested_threads_started++;
3462 thread->looper |= BINDER_LOOPER_STATE_REGISTERED;
3463 binder_inner_proc_unlock(proc);
3465 case BC_ENTER_LOOPER:
3466 binder_debug(BINDER_DEBUG_THREADS,
3467 "%d:%d BC_ENTER_LOOPER\n",
3468 proc->pid, thread->pid);
3469 if (thread->looper & BINDER_LOOPER_STATE_REGISTERED) {
3470 thread->looper |= BINDER_LOOPER_STATE_INVALID;
3471 binder_user_error("%d:%d ERROR: BC_ENTER_LOOPER called after BC_REGISTER_LOOPER\n",
3472 proc->pid, thread->pid);
3474 thread->looper |= BINDER_LOOPER_STATE_ENTERED;
3476 case BC_EXIT_LOOPER:
3477 binder_debug(BINDER_DEBUG_THREADS,
3478 "%d:%d BC_EXIT_LOOPER\n",
3479 proc->pid, thread->pid);
3480 thread->looper |= BINDER_LOOPER_STATE_EXITED;
3483 case BC_REQUEST_DEATH_NOTIFICATION:
3484 case BC_CLEAR_DEATH_NOTIFICATION: {
3486 binder_uintptr_t cookie;
3487 struct binder_ref *ref;
3488 struct binder_ref_death *death = NULL;
3490 if (get_user(target, (uint32_t __user *)ptr))
3492 ptr += sizeof(uint32_t);
3493 if (get_user(cookie, (binder_uintptr_t __user *)ptr))
3495 ptr += sizeof(binder_uintptr_t);
3496 if (cmd == BC_REQUEST_DEATH_NOTIFICATION) {
3498 * Allocate memory for death notification
3499 * before taking lock
3501 death = kzalloc(sizeof(*death), GFP_KERNEL);
3502 if (death == NULL) {
3503 WARN_ON(thread->return_error.cmd !=
3505 thread->return_error.cmd = BR_ERROR;
3506 binder_enqueue_thread_work(
3508 &thread->return_error.work);
3510 BINDER_DEBUG_FAILED_TRANSACTION,
3511 "%d:%d BC_REQUEST_DEATH_NOTIFICATION failed\n",
3512 proc->pid, thread->pid);
3516 binder_proc_lock(proc);
3517 ref = binder_get_ref_olocked(proc, target, false);
3519 binder_user_error("%d:%d %s invalid ref %d\n",
3520 proc->pid, thread->pid,
3521 cmd == BC_REQUEST_DEATH_NOTIFICATION ?
3522 "BC_REQUEST_DEATH_NOTIFICATION" :
3523 "BC_CLEAR_DEATH_NOTIFICATION",
3525 binder_proc_unlock(proc);
3530 binder_debug(BINDER_DEBUG_DEATH_NOTIFICATION,
3531 "%d:%d %s %016llx ref %d desc %d s %d w %d for node %d\n",
3532 proc->pid, thread->pid,
3533 cmd == BC_REQUEST_DEATH_NOTIFICATION ?
3534 "BC_REQUEST_DEATH_NOTIFICATION" :
3535 "BC_CLEAR_DEATH_NOTIFICATION",
3536 (u64)cookie, ref->data.debug_id,
3537 ref->data.desc, ref->data.strong,
3538 ref->data.weak, ref->node->debug_id);
3540 binder_node_lock(ref->node);
3541 if (cmd == BC_REQUEST_DEATH_NOTIFICATION) {
3543 binder_user_error("%d:%d BC_REQUEST_DEATH_NOTIFICATION death notification already set\n",
3544 proc->pid, thread->pid);
3545 binder_node_unlock(ref->node);
3546 binder_proc_unlock(proc);
3550 binder_stats_created(BINDER_STAT_DEATH);
3551 INIT_LIST_HEAD(&death->work.entry);
3552 death->cookie = cookie;
3554 if (ref->node->proc == NULL) {
3555 ref->death->work.type = BINDER_WORK_DEAD_BINDER;
3557 binder_inner_proc_lock(proc);
3558 binder_enqueue_work_ilocked(
3559 &ref->death->work, &proc->todo);
3560 binder_wakeup_proc_ilocked(proc);
3561 binder_inner_proc_unlock(proc);
3564 if (ref->death == NULL) {
3565 binder_user_error("%d:%d BC_CLEAR_DEATH_NOTIFICATION death notification not active\n",
3566 proc->pid, thread->pid);
3567 binder_node_unlock(ref->node);
3568 binder_proc_unlock(proc);
3572 if (death->cookie != cookie) {
3573 binder_user_error("%d:%d BC_CLEAR_DEATH_NOTIFICATION death notification cookie mismatch %016llx != %016llx\n",
3574 proc->pid, thread->pid,
3577 binder_node_unlock(ref->node);
3578 binder_proc_unlock(proc);
3582 binder_inner_proc_lock(proc);
3583 if (list_empty(&death->work.entry)) {
3584 death->work.type = BINDER_WORK_CLEAR_DEATH_NOTIFICATION;
3585 if (thread->looper &
3586 (BINDER_LOOPER_STATE_REGISTERED |
3587 BINDER_LOOPER_STATE_ENTERED))
3588 binder_enqueue_thread_work_ilocked(
3592 binder_enqueue_work_ilocked(
3595 binder_wakeup_proc_ilocked(
3599 BUG_ON(death->work.type != BINDER_WORK_DEAD_BINDER);
3600 death->work.type = BINDER_WORK_DEAD_BINDER_AND_CLEAR;
3602 binder_inner_proc_unlock(proc);
3604 binder_node_unlock(ref->node);
3605 binder_proc_unlock(proc);
3607 case BC_DEAD_BINDER_DONE: {
3608 struct binder_work *w;
3609 binder_uintptr_t cookie;
3610 struct binder_ref_death *death = NULL;
3612 if (get_user(cookie, (binder_uintptr_t __user *)ptr))
3615 ptr += sizeof(cookie);
3616 binder_inner_proc_lock(proc);
3617 list_for_each_entry(w, &proc->delivered_death,
3619 struct binder_ref_death *tmp_death =
3621 struct binder_ref_death,
3624 if (tmp_death->cookie == cookie) {
3629 binder_debug(BINDER_DEBUG_DEAD_BINDER,
3630 "%d:%d BC_DEAD_BINDER_DONE %016llx found %pK\n",
3631 proc->pid, thread->pid, (u64)cookie,
3633 if (death == NULL) {
3634 binder_user_error("%d:%d BC_DEAD_BINDER_DONE %016llx not found\n",
3635 proc->pid, thread->pid, (u64)cookie);
3636 binder_inner_proc_unlock(proc);
3639 binder_dequeue_work_ilocked(&death->work);
3640 if (death->work.type == BINDER_WORK_DEAD_BINDER_AND_CLEAR) {
3641 death->work.type = BINDER_WORK_CLEAR_DEATH_NOTIFICATION;
3642 if (thread->looper &
3643 (BINDER_LOOPER_STATE_REGISTERED |
3644 BINDER_LOOPER_STATE_ENTERED))
3645 binder_enqueue_thread_work_ilocked(
3646 thread, &death->work);
3648 binder_enqueue_work_ilocked(
3651 binder_wakeup_proc_ilocked(proc);
3654 binder_inner_proc_unlock(proc);
3658 pr_err("%d:%d unknown command %d\n",
3659 proc->pid, thread->pid, cmd);
3662 *consumed = ptr - buffer;
3667 static void binder_stat_br(struct binder_proc *proc,
3668 struct binder_thread *thread, uint32_t cmd)
3670 trace_binder_return(cmd);
3671 if (_IOC_NR(cmd) < ARRAY_SIZE(binder_stats.br)) {
3672 atomic_inc(&binder_stats.br[_IOC_NR(cmd)]);
3673 atomic_inc(&proc->stats.br[_IOC_NR(cmd)]);
3674 atomic_inc(&thread->stats.br[_IOC_NR(cmd)]);
3678 static int binder_put_node_cmd(struct binder_proc *proc,
3679 struct binder_thread *thread,
3681 binder_uintptr_t node_ptr,
3682 binder_uintptr_t node_cookie,
3684 uint32_t cmd, const char *cmd_name)
3686 void __user *ptr = *ptrp;
3688 if (put_user(cmd, (uint32_t __user *)ptr))
3690 ptr += sizeof(uint32_t);
3692 if (put_user(node_ptr, (binder_uintptr_t __user *)ptr))
3694 ptr += sizeof(binder_uintptr_t);
3696 if (put_user(node_cookie, (binder_uintptr_t __user *)ptr))
3698 ptr += sizeof(binder_uintptr_t);
3700 binder_stat_br(proc, thread, cmd);
3701 binder_debug(BINDER_DEBUG_USER_REFS, "%d:%d %s %d u%016llx c%016llx\n",
3702 proc->pid, thread->pid, cmd_name, node_debug_id,
3703 (u64)node_ptr, (u64)node_cookie);
3709 static int binder_wait_for_work(struct binder_thread *thread,
3713 struct binder_proc *proc = thread->proc;
3716 freezer_do_not_count();
3717 binder_inner_proc_lock(proc);
3719 prepare_to_wait(&thread->wait, &wait, TASK_INTERRUPTIBLE);
3720 if (binder_has_work_ilocked(thread, do_proc_work))
3723 list_add(&thread->waiting_thread_node,
3724 &proc->waiting_threads);
3725 binder_inner_proc_unlock(proc);
3727 binder_inner_proc_lock(proc);
3728 list_del_init(&thread->waiting_thread_node);
3729 if (signal_pending(current)) {
3734 finish_wait(&thread->wait, &wait);
3735 binder_inner_proc_unlock(proc);
3742 * binder_apply_fd_fixups() - finish fd translation
3743 * @proc: binder_proc associated @t->buffer
3744 * @t: binder transaction with list of fd fixups
3746 * Now that we are in the context of the transaction target
3747 * process, we can allocate and install fds. Process the
3748 * list of fds to translate and fixup the buffer with the
3751 * If we fail to allocate an fd, then free the resources by
3752 * fput'ing files that have not been processed and ksys_close'ing
3753 * any fds that have already been allocated.
3755 static int binder_apply_fd_fixups(struct binder_proc *proc,
3756 struct binder_transaction *t)
3758 struct binder_txn_fd_fixup *fixup, *tmp;
3761 list_for_each_entry(fixup, &t->fd_fixups, fixup_entry) {
3762 int fd = get_unused_fd_flags(O_CLOEXEC);
3765 binder_debug(BINDER_DEBUG_TRANSACTION,
3766 "failed fd fixup txn %d fd %d\n",
3771 binder_debug(BINDER_DEBUG_TRANSACTION,
3772 "fd fixup txn %d fd %d\n",
3774 trace_binder_transaction_fd_recv(t, fd, fixup->offset);
3775 fd_install(fd, fixup->file);
3777 if (binder_alloc_copy_to_buffer(&proc->alloc, t->buffer,
3784 list_for_each_entry_safe(fixup, tmp, &t->fd_fixups, fixup_entry) {
3791 err = binder_alloc_copy_from_buffer(&proc->alloc, &fd,
3797 binder_deferred_fd_close(fd);
3799 list_del(&fixup->fixup_entry);
3806 static int binder_thread_read(struct binder_proc *proc,
3807 struct binder_thread *thread,
3808 binder_uintptr_t binder_buffer, size_t size,
3809 binder_size_t *consumed, int non_block)
3811 void __user *buffer = (void __user *)(uintptr_t)binder_buffer;
3812 void __user *ptr = buffer + *consumed;
3813 void __user *end = buffer + size;
3816 int wait_for_proc_work;
3818 if (*consumed == 0) {
3819 if (put_user(BR_NOOP, (uint32_t __user *)ptr))
3821 ptr += sizeof(uint32_t);
3825 binder_inner_proc_lock(proc);
3826 wait_for_proc_work = binder_available_for_proc_work_ilocked(thread);
3827 binder_inner_proc_unlock(proc);
3829 thread->looper |= BINDER_LOOPER_STATE_WAITING;
3831 trace_binder_wait_for_work(wait_for_proc_work,
3832 !!thread->transaction_stack,
3833 !binder_worklist_empty(proc, &thread->todo));
3834 if (wait_for_proc_work) {
3835 if (!(thread->looper & (BINDER_LOOPER_STATE_REGISTERED |
3836 BINDER_LOOPER_STATE_ENTERED))) {
3837 binder_user_error("%d:%d ERROR: Thread waiting for process work before calling BC_REGISTER_LOOPER or BC_ENTER_LOOPER (state %x)\n",
3838 proc->pid, thread->pid, thread->looper);
3839 wait_event_interruptible(binder_user_error_wait,
3840 binder_stop_on_user_error < 2);
3842 binder_set_nice(proc->default_priority);
3846 if (!binder_has_work(thread, wait_for_proc_work))
3849 ret = binder_wait_for_work(thread, wait_for_proc_work);
3852 thread->looper &= ~BINDER_LOOPER_STATE_WAITING;
3859 struct binder_transaction_data_secctx tr;
3860 struct binder_transaction_data *trd = &tr.transaction_data;
3861 struct binder_work *w = NULL;
3862 struct list_head *list = NULL;
3863 struct binder_transaction *t = NULL;
3864 struct binder_thread *t_from;
3865 size_t trsize = sizeof(*trd);
3867 binder_inner_proc_lock(proc);
3868 if (!binder_worklist_empty_ilocked(&thread->todo))
3869 list = &thread->todo;
3870 else if (!binder_worklist_empty_ilocked(&proc->todo) &&
3874 binder_inner_proc_unlock(proc);
3877 if (ptr - buffer == 4 && !thread->looper_need_return)
3882 if (end - ptr < sizeof(tr) + 4) {
3883 binder_inner_proc_unlock(proc);
3886 w = binder_dequeue_work_head_ilocked(list);
3887 if (binder_worklist_empty_ilocked(&thread->todo))
3888 thread->process_todo = false;
3891 case BINDER_WORK_TRANSACTION: {
3892 binder_inner_proc_unlock(proc);
3893 t = container_of(w, struct binder_transaction, work);
3895 case BINDER_WORK_RETURN_ERROR: {
3896 struct binder_error *e = container_of(
3897 w, struct binder_error, work);
3899 WARN_ON(e->cmd == BR_OK);
3900 binder_inner_proc_unlock(proc);
3901 if (put_user(e->cmd, (uint32_t __user *)ptr))
3905 ptr += sizeof(uint32_t);
3907 binder_stat_br(proc, thread, cmd);
3909 case BINDER_WORK_TRANSACTION_COMPLETE:
3910 case BINDER_WORK_TRANSACTION_ONEWAY_SPAM_SUSPECT: {
3911 if (proc->oneway_spam_detection_enabled &&
3912 w->type == BINDER_WORK_TRANSACTION_ONEWAY_SPAM_SUSPECT)
3913 cmd = BR_ONEWAY_SPAM_SUSPECT;
3915 cmd = BR_TRANSACTION_COMPLETE;
3916 binder_inner_proc_unlock(proc);
3918 binder_stats_deleted(BINDER_STAT_TRANSACTION_COMPLETE);
3919 if (put_user(cmd, (uint32_t __user *)ptr))
3921 ptr += sizeof(uint32_t);
3923 binder_stat_br(proc, thread, cmd);
3924 binder_debug(BINDER_DEBUG_TRANSACTION_COMPLETE,
3925 "%d:%d BR_TRANSACTION_COMPLETE\n",
3926 proc->pid, thread->pid);
3928 case BINDER_WORK_NODE: {
3929 struct binder_node *node = container_of(w, struct binder_node, work);
3931 binder_uintptr_t node_ptr = node->ptr;
3932 binder_uintptr_t node_cookie = node->cookie;
3933 int node_debug_id = node->debug_id;
3936 void __user *orig_ptr = ptr;
3938 BUG_ON(proc != node->proc);
3939 strong = node->internal_strong_refs ||
3940 node->local_strong_refs;
3941 weak = !hlist_empty(&node->refs) ||
3942 node->local_weak_refs ||
3943 node->tmp_refs || strong;
3944 has_strong_ref = node->has_strong_ref;
3945 has_weak_ref = node->has_weak_ref;
3947 if (weak && !has_weak_ref) {
3948 node->has_weak_ref = 1;
3949 node->pending_weak_ref = 1;
3950 node->local_weak_refs++;
3952 if (strong && !has_strong_ref) {
3953 node->has_strong_ref = 1;
3954 node->pending_strong_ref = 1;
3955 node->local_strong_refs++;
3957 if (!strong && has_strong_ref)
3958 node->has_strong_ref = 0;
3959 if (!weak && has_weak_ref)
3960 node->has_weak_ref = 0;
3961 if (!weak && !strong) {
3962 binder_debug(BINDER_DEBUG_INTERNAL_REFS,
3963 "%d:%d node %d u%016llx c%016llx deleted\n",
3964 proc->pid, thread->pid,
3968 rb_erase(&node->rb_node, &proc->nodes);
3969 binder_inner_proc_unlock(proc);
3970 binder_node_lock(node);
3972 * Acquire the node lock before freeing the
3973 * node to serialize with other threads that
3974 * may have been holding the node lock while
3975 * decrementing this node (avoids race where
3976 * this thread frees while the other thread
3977 * is unlocking the node after the final
3980 binder_node_unlock(node);
3981 binder_free_node(node);
3983 binder_inner_proc_unlock(proc);
3985 if (weak && !has_weak_ref)
3986 ret = binder_put_node_cmd(
3987 proc, thread, &ptr, node_ptr,
3988 node_cookie, node_debug_id,
3989 BR_INCREFS, "BR_INCREFS");
3990 if (!ret && strong && !has_strong_ref)
3991 ret = binder_put_node_cmd(
3992 proc, thread, &ptr, node_ptr,
3993 node_cookie, node_debug_id,
3994 BR_ACQUIRE, "BR_ACQUIRE");
3995 if (!ret && !strong && has_strong_ref)
3996 ret = binder_put_node_cmd(
3997 proc, thread, &ptr, node_ptr,
3998 node_cookie, node_debug_id,
3999 BR_RELEASE, "BR_RELEASE");
4000 if (!ret && !weak && has_weak_ref)
4001 ret = binder_put_node_cmd(
4002 proc, thread, &ptr, node_ptr,
4003 node_cookie, node_debug_id,
4004 BR_DECREFS, "BR_DECREFS");
4005 if (orig_ptr == ptr)
4006 binder_debug(BINDER_DEBUG_INTERNAL_REFS,
4007 "%d:%d node %d u%016llx c%016llx state unchanged\n",
4008 proc->pid, thread->pid,
4015 case BINDER_WORK_DEAD_BINDER:
4016 case BINDER_WORK_DEAD_BINDER_AND_CLEAR:
4017 case BINDER_WORK_CLEAR_DEATH_NOTIFICATION: {
4018 struct binder_ref_death *death;
4020 binder_uintptr_t cookie;
4022 death = container_of(w, struct binder_ref_death, work);
4023 if (w->type == BINDER_WORK_CLEAR_DEATH_NOTIFICATION)
4024 cmd = BR_CLEAR_DEATH_NOTIFICATION_DONE;
4026 cmd = BR_DEAD_BINDER;
4027 cookie = death->cookie;
4029 binder_debug(BINDER_DEBUG_DEATH_NOTIFICATION,
4030 "%d:%d %s %016llx\n",
4031 proc->pid, thread->pid,
4032 cmd == BR_DEAD_BINDER ?
4034 "BR_CLEAR_DEATH_NOTIFICATION_DONE",
4036 if (w->type == BINDER_WORK_CLEAR_DEATH_NOTIFICATION) {
4037 binder_inner_proc_unlock(proc);
4039 binder_stats_deleted(BINDER_STAT_DEATH);
4041 binder_enqueue_work_ilocked(
4042 w, &proc->delivered_death);
4043 binder_inner_proc_unlock(proc);
4045 if (put_user(cmd, (uint32_t __user *)ptr))
4047 ptr += sizeof(uint32_t);
4048 if (put_user(cookie,
4049 (binder_uintptr_t __user *)ptr))
4051 ptr += sizeof(binder_uintptr_t);
4052 binder_stat_br(proc, thread, cmd);
4053 if (cmd == BR_DEAD_BINDER)
4054 goto done; /* DEAD_BINDER notifications can cause transactions */
4057 binder_inner_proc_unlock(proc);
4058 pr_err("%d:%d: bad work type %d\n",
4059 proc->pid, thread->pid, w->type);
4066 BUG_ON(t->buffer == NULL);
4067 if (t->buffer->target_node) {
4068 struct binder_node *target_node = t->buffer->target_node;
4070 trd->target.ptr = target_node->ptr;
4071 trd->cookie = target_node->cookie;
4072 t->saved_priority = task_nice(current);
4073 if (t->priority < target_node->min_priority &&
4074 !(t->flags & TF_ONE_WAY))
4075 binder_set_nice(t->priority);
4076 else if (!(t->flags & TF_ONE_WAY) ||
4077 t->saved_priority > target_node->min_priority)
4078 binder_set_nice(target_node->min_priority);
4079 cmd = BR_TRANSACTION;
4081 trd->target.ptr = 0;
4085 trd->code = t->code;
4086 trd->flags = t->flags;
4087 trd->sender_euid = from_kuid(current_user_ns(), t->sender_euid);
4089 t_from = binder_get_txn_from(t);
4091 struct task_struct *sender = t_from->proc->tsk;
4094 task_tgid_nr_ns(sender,
4095 task_active_pid_ns(current));
4097 trd->sender_pid = 0;
4100 ret = binder_apply_fd_fixups(proc, t);
4102 struct binder_buffer *buffer = t->buffer;
4103 bool oneway = !!(t->flags & TF_ONE_WAY);
4104 int tid = t->debug_id;
4107 binder_thread_dec_tmpref(t_from);
4108 buffer->transaction = NULL;
4109 binder_cleanup_transaction(t, "fd fixups failed",
4111 binder_free_buf(proc, thread, buffer, true);
4112 binder_debug(BINDER_DEBUG_FAILED_TRANSACTION,
4113 "%d:%d %stransaction %d fd fixups failed %d/%d, line %d\n",
4114 proc->pid, thread->pid,
4116 (cmd == BR_REPLY ? "reply " : ""),
4117 tid, BR_FAILED_REPLY, ret, __LINE__);
4118 if (cmd == BR_REPLY) {
4119 cmd = BR_FAILED_REPLY;
4120 if (put_user(cmd, (uint32_t __user *)ptr))
4122 ptr += sizeof(uint32_t);
4123 binder_stat_br(proc, thread, cmd);
4128 trd->data_size = t->buffer->data_size;
4129 trd->offsets_size = t->buffer->offsets_size;
4130 trd->data.ptr.buffer = (uintptr_t)t->buffer->user_data;
4131 trd->data.ptr.offsets = trd->data.ptr.buffer +
4132 ALIGN(t->buffer->data_size,
4135 tr.secctx = t->security_ctx;
4136 if (t->security_ctx) {
4137 cmd = BR_TRANSACTION_SEC_CTX;
4138 trsize = sizeof(tr);
4140 if (put_user(cmd, (uint32_t __user *)ptr)) {
4142 binder_thread_dec_tmpref(t_from);
4144 binder_cleanup_transaction(t, "put_user failed",
4149 ptr += sizeof(uint32_t);
4150 if (copy_to_user(ptr, &tr, trsize)) {
4152 binder_thread_dec_tmpref(t_from);
4154 binder_cleanup_transaction(t, "copy_to_user failed",
4161 trace_binder_transaction_received(t);
4162 binder_stat_br(proc, thread, cmd);
4163 binder_debug(BINDER_DEBUG_TRANSACTION,
4164 "%d:%d %s %d %d:%d, cmd %d size %zd-%zd ptr %016llx-%016llx\n",
4165 proc->pid, thread->pid,
4166 (cmd == BR_TRANSACTION) ? "BR_TRANSACTION" :
4167 (cmd == BR_TRANSACTION_SEC_CTX) ?
4168 "BR_TRANSACTION_SEC_CTX" : "BR_REPLY",
4169 t->debug_id, t_from ? t_from->proc->pid : 0,
4170 t_from ? t_from->pid : 0, cmd,
4171 t->buffer->data_size, t->buffer->offsets_size,
4172 (u64)trd->data.ptr.buffer,
4173 (u64)trd->data.ptr.offsets);
4176 binder_thread_dec_tmpref(t_from);
4177 t->buffer->allow_user_free = 1;
4178 if (cmd != BR_REPLY && !(t->flags & TF_ONE_WAY)) {
4179 binder_inner_proc_lock(thread->proc);
4180 t->to_parent = thread->transaction_stack;
4181 t->to_thread = thread;
4182 thread->transaction_stack = t;
4183 binder_inner_proc_unlock(thread->proc);
4185 binder_free_transaction(t);
4192 *consumed = ptr - buffer;
4193 binder_inner_proc_lock(proc);
4194 if (proc->requested_threads == 0 &&
4195 list_empty(&thread->proc->waiting_threads) &&
4196 proc->requested_threads_started < proc->max_threads &&
4197 (thread->looper & (BINDER_LOOPER_STATE_REGISTERED |
4198 BINDER_LOOPER_STATE_ENTERED)) /* the user-space code fails to */
4199 /*spawn a new thread if we leave this out */) {
4200 proc->requested_threads++;
4201 binder_inner_proc_unlock(proc);
4202 binder_debug(BINDER_DEBUG_THREADS,
4203 "%d:%d BR_SPAWN_LOOPER\n",
4204 proc->pid, thread->pid);
4205 if (put_user(BR_SPAWN_LOOPER, (uint32_t __user *)buffer))
4207 binder_stat_br(proc, thread, BR_SPAWN_LOOPER);
4209 binder_inner_proc_unlock(proc);
4213 static void binder_release_work(struct binder_proc *proc,
4214 struct list_head *list)
4216 struct binder_work *w;
4217 enum binder_work_type wtype;
4220 binder_inner_proc_lock(proc);
4221 w = binder_dequeue_work_head_ilocked(list);
4222 wtype = w ? w->type : 0;
4223 binder_inner_proc_unlock(proc);
4228 case BINDER_WORK_TRANSACTION: {
4229 struct binder_transaction *t;
4231 t = container_of(w, struct binder_transaction, work);
4233 binder_cleanup_transaction(t, "process died.",
4236 case BINDER_WORK_RETURN_ERROR: {
4237 struct binder_error *e = container_of(
4238 w, struct binder_error, work);
4240 binder_debug(BINDER_DEBUG_DEAD_TRANSACTION,
4241 "undelivered TRANSACTION_ERROR: %u\n",
4244 case BINDER_WORK_TRANSACTION_COMPLETE: {
4245 binder_debug(BINDER_DEBUG_DEAD_TRANSACTION,
4246 "undelivered TRANSACTION_COMPLETE\n");
4248 binder_stats_deleted(BINDER_STAT_TRANSACTION_COMPLETE);
4250 case BINDER_WORK_DEAD_BINDER_AND_CLEAR:
4251 case BINDER_WORK_CLEAR_DEATH_NOTIFICATION: {
4252 struct binder_ref_death *death;
4254 death = container_of(w, struct binder_ref_death, work);
4255 binder_debug(BINDER_DEBUG_DEAD_TRANSACTION,
4256 "undelivered death notification, %016llx\n",
4257 (u64)death->cookie);
4259 binder_stats_deleted(BINDER_STAT_DEATH);
4261 case BINDER_WORK_NODE:
4264 pr_err("unexpected work type, %d, not freed\n",
4272 static struct binder_thread *binder_get_thread_ilocked(
4273 struct binder_proc *proc, struct binder_thread *new_thread)
4275 struct binder_thread *thread = NULL;
4276 struct rb_node *parent = NULL;
4277 struct rb_node **p = &proc->threads.rb_node;
4281 thread = rb_entry(parent, struct binder_thread, rb_node);
4283 if (current->pid < thread->pid)
4285 else if (current->pid > thread->pid)
4286 p = &(*p)->rb_right;
4292 thread = new_thread;
4293 binder_stats_created(BINDER_STAT_THREAD);
4294 thread->proc = proc;
4295 thread->pid = current->pid;
4296 atomic_set(&thread->tmp_ref, 0);
4297 init_waitqueue_head(&thread->wait);
4298 INIT_LIST_HEAD(&thread->todo);
4299 rb_link_node(&thread->rb_node, parent, p);
4300 rb_insert_color(&thread->rb_node, &proc->threads);
4301 thread->looper_need_return = true;
4302 thread->return_error.work.type = BINDER_WORK_RETURN_ERROR;
4303 thread->return_error.cmd = BR_OK;
4304 thread->reply_error.work.type = BINDER_WORK_RETURN_ERROR;
4305 thread->reply_error.cmd = BR_OK;
4306 INIT_LIST_HEAD(&new_thread->waiting_thread_node);
4310 static struct binder_thread *binder_get_thread(struct binder_proc *proc)
4312 struct binder_thread *thread;
4313 struct binder_thread *new_thread;
4315 binder_inner_proc_lock(proc);
4316 thread = binder_get_thread_ilocked(proc, NULL);
4317 binder_inner_proc_unlock(proc);
4319 new_thread = kzalloc(sizeof(*thread), GFP_KERNEL);
4320 if (new_thread == NULL)
4322 binder_inner_proc_lock(proc);
4323 thread = binder_get_thread_ilocked(proc, new_thread);
4324 binder_inner_proc_unlock(proc);
4325 if (thread != new_thread)
4331 static void binder_free_proc(struct binder_proc *proc)
4333 struct binder_device *device;
4335 BUG_ON(!list_empty(&proc->todo));
4336 BUG_ON(!list_empty(&proc->delivered_death));
4337 if (proc->outstanding_txns)
4338 pr_warn("%s: Unexpected outstanding_txns %d\n",
4339 __func__, proc->outstanding_txns);
4340 device = container_of(proc->context, struct binder_device, context);
4341 if (refcount_dec_and_test(&device->ref)) {
4342 kfree(proc->context->name);
4345 binder_alloc_deferred_release(&proc->alloc);
4346 put_task_struct(proc->tsk);
4347 put_cred(proc->cred);
4348 binder_stats_deleted(BINDER_STAT_PROC);
4352 static void binder_free_thread(struct binder_thread *thread)
4354 BUG_ON(!list_empty(&thread->todo));
4355 binder_stats_deleted(BINDER_STAT_THREAD);
4356 binder_proc_dec_tmpref(thread->proc);
4360 static int binder_thread_release(struct binder_proc *proc,
4361 struct binder_thread *thread)
4363 struct binder_transaction *t;
4364 struct binder_transaction *send_reply = NULL;
4365 int active_transactions = 0;
4366 struct binder_transaction *last_t = NULL;
4368 binder_inner_proc_lock(thread->proc);
4370 * take a ref on the proc so it survives
4371 * after we remove this thread from proc->threads.
4372 * The corresponding dec is when we actually
4373 * free the thread in binder_free_thread()
4377 * take a ref on this thread to ensure it
4378 * survives while we are releasing it
4380 atomic_inc(&thread->tmp_ref);
4381 rb_erase(&thread->rb_node, &proc->threads);
4382 t = thread->transaction_stack;
4384 spin_lock(&t->lock);
4385 if (t->to_thread == thread)
4388 __acquire(&t->lock);
4390 thread->is_dead = true;
4394 active_transactions++;
4395 binder_debug(BINDER_DEBUG_DEAD_TRANSACTION,
4396 "release %d:%d transaction %d %s, still active\n",
4397 proc->pid, thread->pid,
4399 (t->to_thread == thread) ? "in" : "out");
4401 if (t->to_thread == thread) {
4402 thread->proc->outstanding_txns--;
4404 t->to_thread = NULL;
4406 t->buffer->transaction = NULL;
4410 } else if (t->from == thread) {
4415 spin_unlock(&last_t->lock);
4417 spin_lock(&t->lock);
4419 __acquire(&t->lock);
4421 /* annotation for sparse, lock not acquired in last iteration above */
4422 __release(&t->lock);
4425 * If this thread used poll, make sure we remove the waitqueue
4426 * from any epoll data structures holding it with POLLFREE.
4427 * waitqueue_active() is safe to use here because we're holding
4430 if ((thread->looper & BINDER_LOOPER_STATE_POLL) &&
4431 waitqueue_active(&thread->wait)) {
4432 wake_up_poll(&thread->wait, EPOLLHUP | POLLFREE);
4435 binder_inner_proc_unlock(thread->proc);
4438 * This is needed to avoid races between wake_up_poll() above and
4439 * and ep_remove_waitqueue() called for other reasons (eg the epoll file
4440 * descriptor being closed); ep_remove_waitqueue() holds an RCU read
4441 * lock, so we can be sure it's done after calling synchronize_rcu().
4443 if (thread->looper & BINDER_LOOPER_STATE_POLL)
4447 binder_send_failed_reply(send_reply, BR_DEAD_REPLY);
4448 binder_release_work(proc, &thread->todo);
4449 binder_thread_dec_tmpref(thread);
4450 return active_transactions;
4453 static __poll_t binder_poll(struct file *filp,
4454 struct poll_table_struct *wait)
4456 struct binder_proc *proc = filp->private_data;
4457 struct binder_thread *thread = NULL;
4458 bool wait_for_proc_work;
4460 thread = binder_get_thread(proc);
4464 binder_inner_proc_lock(thread->proc);
4465 thread->looper |= BINDER_LOOPER_STATE_POLL;
4466 wait_for_proc_work = binder_available_for_proc_work_ilocked(thread);
4468 binder_inner_proc_unlock(thread->proc);
4470 poll_wait(filp, &thread->wait, wait);
4472 if (binder_has_work(thread, wait_for_proc_work))
4478 static int binder_ioctl_write_read(struct file *filp,
4479 unsigned int cmd, unsigned long arg,
4480 struct binder_thread *thread)
4483 struct binder_proc *proc = filp->private_data;
4484 unsigned int size = _IOC_SIZE(cmd);
4485 void __user *ubuf = (void __user *)arg;
4486 struct binder_write_read bwr;
4488 if (size != sizeof(struct binder_write_read)) {
4492 if (copy_from_user(&bwr, ubuf, sizeof(bwr))) {
4496 binder_debug(BINDER_DEBUG_READ_WRITE,
4497 "%d:%d write %lld at %016llx, read %lld at %016llx\n",
4498 proc->pid, thread->pid,
4499 (u64)bwr.write_size, (u64)bwr.write_buffer,
4500 (u64)bwr.read_size, (u64)bwr.read_buffer);
4502 if (bwr.write_size > 0) {
4503 ret = binder_thread_write(proc, thread,
4506 &bwr.write_consumed);
4507 trace_binder_write_done(ret);
4509 bwr.read_consumed = 0;
4510 if (copy_to_user(ubuf, &bwr, sizeof(bwr)))
4515 if (bwr.read_size > 0) {
4516 ret = binder_thread_read(proc, thread, bwr.read_buffer,
4519 filp->f_flags & O_NONBLOCK);
4520 trace_binder_read_done(ret);
4521 binder_inner_proc_lock(proc);
4522 if (!binder_worklist_empty_ilocked(&proc->todo))
4523 binder_wakeup_proc_ilocked(proc);
4524 binder_inner_proc_unlock(proc);
4526 if (copy_to_user(ubuf, &bwr, sizeof(bwr)))
4531 binder_debug(BINDER_DEBUG_READ_WRITE,
4532 "%d:%d wrote %lld of %lld, read return %lld of %lld\n",
4533 proc->pid, thread->pid,
4534 (u64)bwr.write_consumed, (u64)bwr.write_size,
4535 (u64)bwr.read_consumed, (u64)bwr.read_size);
4536 if (copy_to_user(ubuf, &bwr, sizeof(bwr))) {
4544 static int binder_ioctl_set_ctx_mgr(struct file *filp,
4545 struct flat_binder_object *fbo)
4548 struct binder_proc *proc = filp->private_data;
4549 struct binder_context *context = proc->context;
4550 struct binder_node *new_node;
4551 kuid_t curr_euid = current_euid();
4553 mutex_lock(&context->context_mgr_node_lock);
4554 if (context->binder_context_mgr_node) {
4555 pr_err("BINDER_SET_CONTEXT_MGR already set\n");
4559 ret = security_binder_set_context_mgr(proc->cred);
4562 if (uid_valid(context->binder_context_mgr_uid)) {
4563 if (!uid_eq(context->binder_context_mgr_uid, curr_euid)) {
4564 pr_err("BINDER_SET_CONTEXT_MGR bad uid %d != %d\n",
4565 from_kuid(&init_user_ns, curr_euid),
4566 from_kuid(&init_user_ns,
4567 context->binder_context_mgr_uid));
4572 context->binder_context_mgr_uid = curr_euid;
4574 new_node = binder_new_node(proc, fbo);
4579 binder_node_lock(new_node);
4580 new_node->local_weak_refs++;
4581 new_node->local_strong_refs++;
4582 new_node->has_strong_ref = 1;
4583 new_node->has_weak_ref = 1;
4584 context->binder_context_mgr_node = new_node;
4585 binder_node_unlock(new_node);
4586 binder_put_node(new_node);
4588 mutex_unlock(&context->context_mgr_node_lock);
4592 static int binder_ioctl_get_node_info_for_ref(struct binder_proc *proc,
4593 struct binder_node_info_for_ref *info)
4595 struct binder_node *node;
4596 struct binder_context *context = proc->context;
4597 __u32 handle = info->handle;
4599 if (info->strong_count || info->weak_count || info->reserved1 ||
4600 info->reserved2 || info->reserved3) {
4601 binder_user_error("%d BINDER_GET_NODE_INFO_FOR_REF: only handle may be non-zero.",
4606 /* This ioctl may only be used by the context manager */
4607 mutex_lock(&context->context_mgr_node_lock);
4608 if (!context->binder_context_mgr_node ||
4609 context->binder_context_mgr_node->proc != proc) {
4610 mutex_unlock(&context->context_mgr_node_lock);
4613 mutex_unlock(&context->context_mgr_node_lock);
4615 node = binder_get_node_from_ref(proc, handle, true, NULL);
4619 info->strong_count = node->local_strong_refs +
4620 node->internal_strong_refs;
4621 info->weak_count = node->local_weak_refs;
4623 binder_put_node(node);
4628 static int binder_ioctl_get_node_debug_info(struct binder_proc *proc,
4629 struct binder_node_debug_info *info)
4632 binder_uintptr_t ptr = info->ptr;
4634 memset(info, 0, sizeof(*info));
4636 binder_inner_proc_lock(proc);
4637 for (n = rb_first(&proc->nodes); n != NULL; n = rb_next(n)) {
4638 struct binder_node *node = rb_entry(n, struct binder_node,
4640 if (node->ptr > ptr) {
4641 info->ptr = node->ptr;
4642 info->cookie = node->cookie;
4643 info->has_strong_ref = node->has_strong_ref;
4644 info->has_weak_ref = node->has_weak_ref;
4648 binder_inner_proc_unlock(proc);
4653 static bool binder_txns_pending_ilocked(struct binder_proc *proc)
4656 struct binder_thread *thread;
4658 if (proc->outstanding_txns > 0)
4661 for (n = rb_first(&proc->threads); n; n = rb_next(n)) {
4662 thread = rb_entry(n, struct binder_thread, rb_node);
4663 if (thread->transaction_stack)
4669 static int binder_ioctl_freeze(struct binder_freeze_info *info,
4670 struct binder_proc *target_proc)
4674 if (!info->enable) {
4675 binder_inner_proc_lock(target_proc);
4676 target_proc->sync_recv = false;
4677 target_proc->async_recv = false;
4678 target_proc->is_frozen = false;
4679 binder_inner_proc_unlock(target_proc);
4684 * Freezing the target. Prevent new transactions by
4685 * setting frozen state. If timeout specified, wait
4686 * for transactions to drain.
4688 binder_inner_proc_lock(target_proc);
4689 target_proc->sync_recv = false;
4690 target_proc->async_recv = false;
4691 target_proc->is_frozen = true;
4692 binder_inner_proc_unlock(target_proc);
4694 if (info->timeout_ms > 0)
4695 ret = wait_event_interruptible_timeout(
4696 target_proc->freeze_wait,
4697 (!target_proc->outstanding_txns),
4698 msecs_to_jiffies(info->timeout_ms));
4700 /* Check pending transactions that wait for reply */
4702 binder_inner_proc_lock(target_proc);
4703 if (binder_txns_pending_ilocked(target_proc))
4705 binder_inner_proc_unlock(target_proc);
4709 binder_inner_proc_lock(target_proc);
4710 target_proc->is_frozen = false;
4711 binder_inner_proc_unlock(target_proc);
4717 static int binder_ioctl_get_freezer_info(
4718 struct binder_frozen_status_info *info)
4720 struct binder_proc *target_proc;
4724 info->sync_recv = 0;
4725 info->async_recv = 0;
4727 mutex_lock(&binder_procs_lock);
4728 hlist_for_each_entry(target_proc, &binder_procs, proc_node) {
4729 if (target_proc->pid == info->pid) {
4731 binder_inner_proc_lock(target_proc);
4732 txns_pending = binder_txns_pending_ilocked(target_proc);
4733 info->sync_recv |= target_proc->sync_recv |
4734 (txns_pending << 1);
4735 info->async_recv |= target_proc->async_recv;
4736 binder_inner_proc_unlock(target_proc);
4739 mutex_unlock(&binder_procs_lock);
4747 static long binder_ioctl(struct file *filp, unsigned int cmd, unsigned long arg)
4750 struct binder_proc *proc = filp->private_data;
4751 struct binder_thread *thread;
4752 unsigned int size = _IOC_SIZE(cmd);
4753 void __user *ubuf = (void __user *)arg;
4755 /*pr_info("binder_ioctl: %d:%d %x %lx\n",
4756 proc->pid, current->pid, cmd, arg);*/
4758 binder_selftest_alloc(&proc->alloc);
4760 trace_binder_ioctl(cmd, arg);
4762 ret = wait_event_interruptible(binder_user_error_wait, binder_stop_on_user_error < 2);
4766 thread = binder_get_thread(proc);
4767 if (thread == NULL) {
4773 case BINDER_WRITE_READ:
4774 ret = binder_ioctl_write_read(filp, cmd, arg, thread);
4778 case BINDER_SET_MAX_THREADS: {
4781 if (copy_from_user(&max_threads, ubuf,
4782 sizeof(max_threads))) {
4786 binder_inner_proc_lock(proc);
4787 proc->max_threads = max_threads;
4788 binder_inner_proc_unlock(proc);
4791 case BINDER_SET_CONTEXT_MGR_EXT: {
4792 struct flat_binder_object fbo;
4794 if (copy_from_user(&fbo, ubuf, sizeof(fbo))) {
4798 ret = binder_ioctl_set_ctx_mgr(filp, &fbo);
4803 case BINDER_SET_CONTEXT_MGR:
4804 ret = binder_ioctl_set_ctx_mgr(filp, NULL);
4808 case BINDER_THREAD_EXIT:
4809 binder_debug(BINDER_DEBUG_THREADS, "%d:%d exit\n",
4810 proc->pid, thread->pid);
4811 binder_thread_release(proc, thread);
4814 case BINDER_VERSION: {
4815 struct binder_version __user *ver = ubuf;
4817 if (size != sizeof(struct binder_version)) {
4821 if (put_user(BINDER_CURRENT_PROTOCOL_VERSION,
4822 &ver->protocol_version)) {
4828 case BINDER_GET_NODE_INFO_FOR_REF: {
4829 struct binder_node_info_for_ref info;
4831 if (copy_from_user(&info, ubuf, sizeof(info))) {
4836 ret = binder_ioctl_get_node_info_for_ref(proc, &info);
4840 if (copy_to_user(ubuf, &info, sizeof(info))) {
4847 case BINDER_GET_NODE_DEBUG_INFO: {
4848 struct binder_node_debug_info info;
4850 if (copy_from_user(&info, ubuf, sizeof(info))) {
4855 ret = binder_ioctl_get_node_debug_info(proc, &info);
4859 if (copy_to_user(ubuf, &info, sizeof(info))) {
4865 case BINDER_FREEZE: {
4866 struct binder_freeze_info info;
4867 struct binder_proc **target_procs = NULL, *target_proc;
4868 int target_procs_count = 0, i = 0;
4872 if (copy_from_user(&info, ubuf, sizeof(info))) {
4877 mutex_lock(&binder_procs_lock);
4878 hlist_for_each_entry(target_proc, &binder_procs, proc_node) {
4879 if (target_proc->pid == info.pid)
4880 target_procs_count++;
4883 if (target_procs_count == 0) {
4884 mutex_unlock(&binder_procs_lock);
4889 target_procs = kcalloc(target_procs_count,
4890 sizeof(struct binder_proc *),
4893 if (!target_procs) {
4894 mutex_unlock(&binder_procs_lock);
4899 hlist_for_each_entry(target_proc, &binder_procs, proc_node) {
4900 if (target_proc->pid != info.pid)
4903 binder_inner_proc_lock(target_proc);
4904 target_proc->tmp_ref++;
4905 binder_inner_proc_unlock(target_proc);
4907 target_procs[i++] = target_proc;
4909 mutex_unlock(&binder_procs_lock);
4911 for (i = 0; i < target_procs_count; i++) {
4913 ret = binder_ioctl_freeze(&info,
4916 binder_proc_dec_tmpref(target_procs[i]);
4919 kfree(target_procs);
4925 case BINDER_GET_FROZEN_INFO: {
4926 struct binder_frozen_status_info info;
4928 if (copy_from_user(&info, ubuf, sizeof(info))) {
4933 ret = binder_ioctl_get_freezer_info(&info);
4937 if (copy_to_user(ubuf, &info, sizeof(info))) {
4943 case BINDER_ENABLE_ONEWAY_SPAM_DETECTION: {
4946 if (copy_from_user(&enable, ubuf, sizeof(enable))) {
4950 binder_inner_proc_lock(proc);
4951 proc->oneway_spam_detection_enabled = (bool)enable;
4952 binder_inner_proc_unlock(proc);
4962 thread->looper_need_return = false;
4963 wait_event_interruptible(binder_user_error_wait, binder_stop_on_user_error < 2);
4964 if (ret && ret != -EINTR)
4965 pr_info("%d:%d ioctl %x %lx returned %d\n", proc->pid, current->pid, cmd, arg, ret);
4967 trace_binder_ioctl_done(ret);
4971 static void binder_vma_open(struct vm_area_struct *vma)
4973 struct binder_proc *proc = vma->vm_private_data;
4975 binder_debug(BINDER_DEBUG_OPEN_CLOSE,
4976 "%d open vm area %lx-%lx (%ld K) vma %lx pagep %lx\n",
4977 proc->pid, vma->vm_start, vma->vm_end,
4978 (vma->vm_end - vma->vm_start) / SZ_1K, vma->vm_flags,
4979 (unsigned long)pgprot_val(vma->vm_page_prot));
4982 static void binder_vma_close(struct vm_area_struct *vma)
4984 struct binder_proc *proc = vma->vm_private_data;
4986 binder_debug(BINDER_DEBUG_OPEN_CLOSE,
4987 "%d close vm area %lx-%lx (%ld K) vma %lx pagep %lx\n",
4988 proc->pid, vma->vm_start, vma->vm_end,
4989 (vma->vm_end - vma->vm_start) / SZ_1K, vma->vm_flags,
4990 (unsigned long)pgprot_val(vma->vm_page_prot));
4991 binder_alloc_vma_close(&proc->alloc);
4994 static vm_fault_t binder_vm_fault(struct vm_fault *vmf)
4996 return VM_FAULT_SIGBUS;
4999 static const struct vm_operations_struct binder_vm_ops = {
5000 .open = binder_vma_open,
5001 .close = binder_vma_close,
5002 .fault = binder_vm_fault,
5005 static int binder_mmap(struct file *filp, struct vm_area_struct *vma)
5007 struct binder_proc *proc = filp->private_data;
5009 if (proc->tsk != current->group_leader)
5012 binder_debug(BINDER_DEBUG_OPEN_CLOSE,
5013 "%s: %d %lx-%lx (%ld K) vma %lx pagep %lx\n",
5014 __func__, proc->pid, vma->vm_start, vma->vm_end,
5015 (vma->vm_end - vma->vm_start) / SZ_1K, vma->vm_flags,
5016 (unsigned long)pgprot_val(vma->vm_page_prot));
5018 if (vma->vm_flags & FORBIDDEN_MMAP_FLAGS) {
5019 pr_err("%s: %d %lx-%lx %s failed %d\n", __func__,
5020 proc->pid, vma->vm_start, vma->vm_end, "bad vm_flags", -EPERM);
5023 vma->vm_flags |= VM_DONTCOPY | VM_MIXEDMAP;
5024 vma->vm_flags &= ~VM_MAYWRITE;
5026 vma->vm_ops = &binder_vm_ops;
5027 vma->vm_private_data = proc;
5029 return binder_alloc_mmap_handler(&proc->alloc, vma);
5032 static int binder_open(struct inode *nodp, struct file *filp)
5034 struct binder_proc *proc, *itr;
5035 struct binder_device *binder_dev;
5036 struct binderfs_info *info;
5037 struct dentry *binder_binderfs_dir_entry_proc = NULL;
5038 bool existing_pid = false;
5040 binder_debug(BINDER_DEBUG_OPEN_CLOSE, "%s: %d:%d\n", __func__,
5041 current->group_leader->pid, current->pid);
5043 proc = kzalloc(sizeof(*proc), GFP_KERNEL);
5046 spin_lock_init(&proc->inner_lock);
5047 spin_lock_init(&proc->outer_lock);
5048 get_task_struct(current->group_leader);
5049 proc->tsk = current->group_leader;
5050 proc->cred = get_cred(filp->f_cred);
5051 INIT_LIST_HEAD(&proc->todo);
5052 init_waitqueue_head(&proc->freeze_wait);
5053 proc->default_priority = task_nice(current);
5054 /* binderfs stashes devices in i_private */
5055 if (is_binderfs_device(nodp)) {
5056 binder_dev = nodp->i_private;
5057 info = nodp->i_sb->s_fs_info;
5058 binder_binderfs_dir_entry_proc = info->proc_log_dir;
5060 binder_dev = container_of(filp->private_data,
5061 struct binder_device, miscdev);
5063 refcount_inc(&binder_dev->ref);
5064 proc->context = &binder_dev->context;
5065 binder_alloc_init(&proc->alloc);
5067 binder_stats_created(BINDER_STAT_PROC);
5068 proc->pid = current->group_leader->pid;
5069 INIT_LIST_HEAD(&proc->delivered_death);
5070 INIT_LIST_HEAD(&proc->waiting_threads);
5071 filp->private_data = proc;
5073 mutex_lock(&binder_procs_lock);
5074 hlist_for_each_entry(itr, &binder_procs, proc_node) {
5075 if (itr->pid == proc->pid) {
5076 existing_pid = true;
5080 hlist_add_head(&proc->proc_node, &binder_procs);
5081 mutex_unlock(&binder_procs_lock);
5083 if (binder_debugfs_dir_entry_proc && !existing_pid) {
5086 snprintf(strbuf, sizeof(strbuf), "%u", proc->pid);
5088 * proc debug entries are shared between contexts.
5089 * Only create for the first PID to avoid debugfs log spamming
5090 * The printing code will anyway print all contexts for a given
5091 * PID so this is not a problem.
5093 proc->debugfs_entry = debugfs_create_file(strbuf, 0444,
5094 binder_debugfs_dir_entry_proc,
5095 (void *)(unsigned long)proc->pid,
5099 if (binder_binderfs_dir_entry_proc && !existing_pid) {
5101 struct dentry *binderfs_entry;
5103 snprintf(strbuf, sizeof(strbuf), "%u", proc->pid);
5105 * Similar to debugfs, the process specific log file is shared
5106 * between contexts. Only create for the first PID.
5107 * This is ok since same as debugfs, the log file will contain
5108 * information on all contexts of a given PID.
5110 binderfs_entry = binderfs_create_file(binder_binderfs_dir_entry_proc,
5111 strbuf, &proc_fops, (void *)(unsigned long)proc->pid);
5112 if (!IS_ERR(binderfs_entry)) {
5113 proc->binderfs_entry = binderfs_entry;
5117 error = PTR_ERR(binderfs_entry);
5118 pr_warn("Unable to create file %s in binderfs (error %d)\n",
5126 static int binder_flush(struct file *filp, fl_owner_t id)
5128 struct binder_proc *proc = filp->private_data;
5130 binder_defer_work(proc, BINDER_DEFERRED_FLUSH);
5135 static void binder_deferred_flush(struct binder_proc *proc)
5140 binder_inner_proc_lock(proc);
5141 for (n = rb_first(&proc->threads); n != NULL; n = rb_next(n)) {
5142 struct binder_thread *thread = rb_entry(n, struct binder_thread, rb_node);
5144 thread->looper_need_return = true;
5145 if (thread->looper & BINDER_LOOPER_STATE_WAITING) {
5146 wake_up_interruptible(&thread->wait);
5150 binder_inner_proc_unlock(proc);
5152 binder_debug(BINDER_DEBUG_OPEN_CLOSE,
5153 "binder_flush: %d woke %d threads\n", proc->pid,
5157 static int binder_release(struct inode *nodp, struct file *filp)
5159 struct binder_proc *proc = filp->private_data;
5161 debugfs_remove(proc->debugfs_entry);
5163 if (proc->binderfs_entry) {
5164 binderfs_remove_file(proc->binderfs_entry);
5165 proc->binderfs_entry = NULL;
5168 binder_defer_work(proc, BINDER_DEFERRED_RELEASE);
5173 static int binder_node_release(struct binder_node *node, int refs)
5175 struct binder_ref *ref;
5177 struct binder_proc *proc = node->proc;
5179 binder_release_work(proc, &node->async_todo);
5181 binder_node_lock(node);
5182 binder_inner_proc_lock(proc);
5183 binder_dequeue_work_ilocked(&node->work);
5185 * The caller must have taken a temporary ref on the node,
5187 BUG_ON(!node->tmp_refs);
5188 if (hlist_empty(&node->refs) && node->tmp_refs == 1) {
5189 binder_inner_proc_unlock(proc);
5190 binder_node_unlock(node);
5191 binder_free_node(node);
5197 node->local_strong_refs = 0;
5198 node->local_weak_refs = 0;
5199 binder_inner_proc_unlock(proc);
5201 spin_lock(&binder_dead_nodes_lock);
5202 hlist_add_head(&node->dead_node, &binder_dead_nodes);
5203 spin_unlock(&binder_dead_nodes_lock);
5205 hlist_for_each_entry(ref, &node->refs, node_entry) {
5208 * Need the node lock to synchronize
5209 * with new notification requests and the
5210 * inner lock to synchronize with queued
5211 * death notifications.
5213 binder_inner_proc_lock(ref->proc);
5215 binder_inner_proc_unlock(ref->proc);
5221 BUG_ON(!list_empty(&ref->death->work.entry));
5222 ref->death->work.type = BINDER_WORK_DEAD_BINDER;
5223 binder_enqueue_work_ilocked(&ref->death->work,
5225 binder_wakeup_proc_ilocked(ref->proc);
5226 binder_inner_proc_unlock(ref->proc);
5229 binder_debug(BINDER_DEBUG_DEAD_BINDER,
5230 "node %d now dead, refs %d, death %d\n",
5231 node->debug_id, refs, death);
5232 binder_node_unlock(node);
5233 binder_put_node(node);
5238 static void binder_deferred_release(struct binder_proc *proc)
5240 struct binder_context *context = proc->context;
5242 int threads, nodes, incoming_refs, outgoing_refs, active_transactions;
5244 mutex_lock(&binder_procs_lock);
5245 hlist_del(&proc->proc_node);
5246 mutex_unlock(&binder_procs_lock);
5248 mutex_lock(&context->context_mgr_node_lock);
5249 if (context->binder_context_mgr_node &&
5250 context->binder_context_mgr_node->proc == proc) {
5251 binder_debug(BINDER_DEBUG_DEAD_BINDER,
5252 "%s: %d context_mgr_node gone\n",
5253 __func__, proc->pid);
5254 context->binder_context_mgr_node = NULL;
5256 mutex_unlock(&context->context_mgr_node_lock);
5257 binder_inner_proc_lock(proc);
5259 * Make sure proc stays alive after we
5260 * remove all the threads
5264 proc->is_dead = true;
5265 proc->is_frozen = false;
5266 proc->sync_recv = false;
5267 proc->async_recv = false;
5269 active_transactions = 0;
5270 while ((n = rb_first(&proc->threads))) {
5271 struct binder_thread *thread;
5273 thread = rb_entry(n, struct binder_thread, rb_node);
5274 binder_inner_proc_unlock(proc);
5276 active_transactions += binder_thread_release(proc, thread);
5277 binder_inner_proc_lock(proc);
5282 while ((n = rb_first(&proc->nodes))) {
5283 struct binder_node *node;
5285 node = rb_entry(n, struct binder_node, rb_node);
5288 * take a temporary ref on the node before
5289 * calling binder_node_release() which will either
5290 * kfree() the node or call binder_put_node()
5292 binder_inc_node_tmpref_ilocked(node);
5293 rb_erase(&node->rb_node, &proc->nodes);
5294 binder_inner_proc_unlock(proc);
5295 incoming_refs = binder_node_release(node, incoming_refs);
5296 binder_inner_proc_lock(proc);
5298 binder_inner_proc_unlock(proc);
5301 binder_proc_lock(proc);
5302 while ((n = rb_first(&proc->refs_by_desc))) {
5303 struct binder_ref *ref;
5305 ref = rb_entry(n, struct binder_ref, rb_node_desc);
5307 binder_cleanup_ref_olocked(ref);
5308 binder_proc_unlock(proc);
5309 binder_free_ref(ref);
5310 binder_proc_lock(proc);
5312 binder_proc_unlock(proc);
5314 binder_release_work(proc, &proc->todo);
5315 binder_release_work(proc, &proc->delivered_death);
5317 binder_debug(BINDER_DEBUG_OPEN_CLOSE,
5318 "%s: %d threads %d, nodes %d (ref %d), refs %d, active transactions %d\n",
5319 __func__, proc->pid, threads, nodes, incoming_refs,
5320 outgoing_refs, active_transactions);
5322 binder_proc_dec_tmpref(proc);
5325 static void binder_deferred_func(struct work_struct *work)
5327 struct binder_proc *proc;
5332 mutex_lock(&binder_deferred_lock);
5333 if (!hlist_empty(&binder_deferred_list)) {
5334 proc = hlist_entry(binder_deferred_list.first,
5335 struct binder_proc, deferred_work_node);
5336 hlist_del_init(&proc->deferred_work_node);
5337 defer = proc->deferred_work;
5338 proc->deferred_work = 0;
5343 mutex_unlock(&binder_deferred_lock);
5345 if (defer & BINDER_DEFERRED_FLUSH)
5346 binder_deferred_flush(proc);
5348 if (defer & BINDER_DEFERRED_RELEASE)
5349 binder_deferred_release(proc); /* frees proc */
5352 static DECLARE_WORK(binder_deferred_work, binder_deferred_func);
5355 binder_defer_work(struct binder_proc *proc, enum binder_deferred_state defer)
5357 mutex_lock(&binder_deferred_lock);
5358 proc->deferred_work |= defer;
5359 if (hlist_unhashed(&proc->deferred_work_node)) {
5360 hlist_add_head(&proc->deferred_work_node,
5361 &binder_deferred_list);
5362 schedule_work(&binder_deferred_work);
5364 mutex_unlock(&binder_deferred_lock);
5367 static void print_binder_transaction_ilocked(struct seq_file *m,
5368 struct binder_proc *proc,
5370 struct binder_transaction *t)
5372 struct binder_proc *to_proc;
5373 struct binder_buffer *buffer = t->buffer;
5375 spin_lock(&t->lock);
5376 to_proc = t->to_proc;
5378 "%s %d: %pK from %d:%d to %d:%d code %x flags %x pri %ld r%d",
5379 prefix, t->debug_id, t,
5380 t->from ? t->from->proc->pid : 0,
5381 t->from ? t->from->pid : 0,
5382 to_proc ? to_proc->pid : 0,
5383 t->to_thread ? t->to_thread->pid : 0,
5384 t->code, t->flags, t->priority, t->need_reply);
5385 spin_unlock(&t->lock);
5387 if (proc != to_proc) {
5389 * Can only safely deref buffer if we are holding the
5390 * correct proc inner lock for this node
5396 if (buffer == NULL) {
5397 seq_puts(m, " buffer free\n");
5400 if (buffer->target_node)
5401 seq_printf(m, " node %d", buffer->target_node->debug_id);
5402 seq_printf(m, " size %zd:%zd data %pK\n",
5403 buffer->data_size, buffer->offsets_size,
5407 static void print_binder_work_ilocked(struct seq_file *m,
5408 struct binder_proc *proc,
5410 const char *transaction_prefix,
5411 struct binder_work *w)
5413 struct binder_node *node;
5414 struct binder_transaction *t;
5417 case BINDER_WORK_TRANSACTION:
5418 t = container_of(w, struct binder_transaction, work);
5419 print_binder_transaction_ilocked(
5420 m, proc, transaction_prefix, t);
5422 case BINDER_WORK_RETURN_ERROR: {
5423 struct binder_error *e = container_of(
5424 w, struct binder_error, work);
5426 seq_printf(m, "%stransaction error: %u\n",
5429 case BINDER_WORK_TRANSACTION_COMPLETE:
5430 seq_printf(m, "%stransaction complete\n", prefix);
5432 case BINDER_WORK_NODE:
5433 node = container_of(w, struct binder_node, work);
5434 seq_printf(m, "%snode work %d: u%016llx c%016llx\n",
5435 prefix, node->debug_id,
5436 (u64)node->ptr, (u64)node->cookie);
5438 case BINDER_WORK_DEAD_BINDER:
5439 seq_printf(m, "%shas dead binder\n", prefix);
5441 case BINDER_WORK_DEAD_BINDER_AND_CLEAR:
5442 seq_printf(m, "%shas cleared dead binder\n", prefix);
5444 case BINDER_WORK_CLEAR_DEATH_NOTIFICATION:
5445 seq_printf(m, "%shas cleared death notification\n", prefix);
5448 seq_printf(m, "%sunknown work: type %d\n", prefix, w->type);
5453 static void print_binder_thread_ilocked(struct seq_file *m,
5454 struct binder_thread *thread,
5457 struct binder_transaction *t;
5458 struct binder_work *w;
5459 size_t start_pos = m->count;
5462 seq_printf(m, " thread %d: l %02x need_return %d tr %d\n",
5463 thread->pid, thread->looper,
5464 thread->looper_need_return,
5465 atomic_read(&thread->tmp_ref));
5466 header_pos = m->count;
5467 t = thread->transaction_stack;
5469 if (t->from == thread) {
5470 print_binder_transaction_ilocked(m, thread->proc,
5471 " outgoing transaction", t);
5473 } else if (t->to_thread == thread) {
5474 print_binder_transaction_ilocked(m, thread->proc,
5475 " incoming transaction", t);
5478 print_binder_transaction_ilocked(m, thread->proc,
5479 " bad transaction", t);
5483 list_for_each_entry(w, &thread->todo, entry) {
5484 print_binder_work_ilocked(m, thread->proc, " ",
5485 " pending transaction", w);
5487 if (!print_always && m->count == header_pos)
5488 m->count = start_pos;
5491 static void print_binder_node_nilocked(struct seq_file *m,
5492 struct binder_node *node)
5494 struct binder_ref *ref;
5495 struct binder_work *w;
5499 hlist_for_each_entry(ref, &node->refs, node_entry)
5502 seq_printf(m, " node %d: u%016llx c%016llx hs %d hw %d ls %d lw %d is %d iw %d tr %d",
5503 node->debug_id, (u64)node->ptr, (u64)node->cookie,
5504 node->has_strong_ref, node->has_weak_ref,
5505 node->local_strong_refs, node->local_weak_refs,
5506 node->internal_strong_refs, count, node->tmp_refs);
5508 seq_puts(m, " proc");
5509 hlist_for_each_entry(ref, &node->refs, node_entry)
5510 seq_printf(m, " %d", ref->proc->pid);
5514 list_for_each_entry(w, &node->async_todo, entry)
5515 print_binder_work_ilocked(m, node->proc, " ",
5516 " pending async transaction", w);
5520 static void print_binder_ref_olocked(struct seq_file *m,
5521 struct binder_ref *ref)
5523 binder_node_lock(ref->node);
5524 seq_printf(m, " ref %d: desc %d %snode %d s %d w %d d %pK\n",
5525 ref->data.debug_id, ref->data.desc,
5526 ref->node->proc ? "" : "dead ",
5527 ref->node->debug_id, ref->data.strong,
5528 ref->data.weak, ref->death);
5529 binder_node_unlock(ref->node);
5532 static void print_binder_proc(struct seq_file *m,
5533 struct binder_proc *proc, int print_all)
5535 struct binder_work *w;
5537 size_t start_pos = m->count;
5539 struct binder_node *last_node = NULL;
5541 seq_printf(m, "proc %d\n", proc->pid);
5542 seq_printf(m, "context %s\n", proc->context->name);
5543 header_pos = m->count;
5545 binder_inner_proc_lock(proc);
5546 for (n = rb_first(&proc->threads); n != NULL; n = rb_next(n))
5547 print_binder_thread_ilocked(m, rb_entry(n, struct binder_thread,
5548 rb_node), print_all);
5550 for (n = rb_first(&proc->nodes); n != NULL; n = rb_next(n)) {
5551 struct binder_node *node = rb_entry(n, struct binder_node,
5553 if (!print_all && !node->has_async_transaction)
5557 * take a temporary reference on the node so it
5558 * survives and isn't removed from the tree
5559 * while we print it.
5561 binder_inc_node_tmpref_ilocked(node);
5562 /* Need to drop inner lock to take node lock */
5563 binder_inner_proc_unlock(proc);
5565 binder_put_node(last_node);
5566 binder_node_inner_lock(node);
5567 print_binder_node_nilocked(m, node);
5568 binder_node_inner_unlock(node);
5570 binder_inner_proc_lock(proc);
5572 binder_inner_proc_unlock(proc);
5574 binder_put_node(last_node);
5577 binder_proc_lock(proc);
5578 for (n = rb_first(&proc->refs_by_desc);
5581 print_binder_ref_olocked(m, rb_entry(n,
5584 binder_proc_unlock(proc);
5586 binder_alloc_print_allocated(m, &proc->alloc);
5587 binder_inner_proc_lock(proc);
5588 list_for_each_entry(w, &proc->todo, entry)
5589 print_binder_work_ilocked(m, proc, " ",
5590 " pending transaction", w);
5591 list_for_each_entry(w, &proc->delivered_death, entry) {
5592 seq_puts(m, " has delivered dead binder\n");
5595 binder_inner_proc_unlock(proc);
5596 if (!print_all && m->count == header_pos)
5597 m->count = start_pos;
5600 static const char * const binder_return_strings[] = {
5605 "BR_ACQUIRE_RESULT",
5607 "BR_TRANSACTION_COMPLETE",
5612 "BR_ATTEMPT_ACQUIRE",
5617 "BR_CLEAR_DEATH_NOTIFICATION_DONE",
5620 "BR_ONEWAY_SPAM_SUSPECT",
5623 static const char * const binder_command_strings[] = {
5626 "BC_ACQUIRE_RESULT",
5634 "BC_ATTEMPT_ACQUIRE",
5635 "BC_REGISTER_LOOPER",
5638 "BC_REQUEST_DEATH_NOTIFICATION",
5639 "BC_CLEAR_DEATH_NOTIFICATION",
5640 "BC_DEAD_BINDER_DONE",
5641 "BC_TRANSACTION_SG",
5645 static const char * const binder_objstat_strings[] = {
5652 "transaction_complete"
5655 static void print_binder_stats(struct seq_file *m, const char *prefix,
5656 struct binder_stats *stats)
5660 BUILD_BUG_ON(ARRAY_SIZE(stats->bc) !=
5661 ARRAY_SIZE(binder_command_strings));
5662 for (i = 0; i < ARRAY_SIZE(stats->bc); i++) {
5663 int temp = atomic_read(&stats->bc[i]);
5666 seq_printf(m, "%s%s: %d\n", prefix,
5667 binder_command_strings[i], temp);
5670 BUILD_BUG_ON(ARRAY_SIZE(stats->br) !=
5671 ARRAY_SIZE(binder_return_strings));
5672 for (i = 0; i < ARRAY_SIZE(stats->br); i++) {
5673 int temp = atomic_read(&stats->br[i]);
5676 seq_printf(m, "%s%s: %d\n", prefix,
5677 binder_return_strings[i], temp);
5680 BUILD_BUG_ON(ARRAY_SIZE(stats->obj_created) !=
5681 ARRAY_SIZE(binder_objstat_strings));
5682 BUILD_BUG_ON(ARRAY_SIZE(stats->obj_created) !=
5683 ARRAY_SIZE(stats->obj_deleted));
5684 for (i = 0; i < ARRAY_SIZE(stats->obj_created); i++) {
5685 int created = atomic_read(&stats->obj_created[i]);
5686 int deleted = atomic_read(&stats->obj_deleted[i]);
5688 if (created || deleted)
5689 seq_printf(m, "%s%s: active %d total %d\n",
5691 binder_objstat_strings[i],
5697 static void print_binder_proc_stats(struct seq_file *m,
5698 struct binder_proc *proc)
5700 struct binder_work *w;
5701 struct binder_thread *thread;
5703 int count, strong, weak, ready_threads;
5704 size_t free_async_space =
5705 binder_alloc_get_free_async_space(&proc->alloc);
5707 seq_printf(m, "proc %d\n", proc->pid);
5708 seq_printf(m, "context %s\n", proc->context->name);
5711 binder_inner_proc_lock(proc);
5712 for (n = rb_first(&proc->threads); n != NULL; n = rb_next(n))
5715 list_for_each_entry(thread, &proc->waiting_threads, waiting_thread_node)
5718 seq_printf(m, " threads: %d\n", count);
5719 seq_printf(m, " requested threads: %d+%d/%d\n"
5720 " ready threads %d\n"
5721 " free async space %zd\n", proc->requested_threads,
5722 proc->requested_threads_started, proc->max_threads,
5726 for (n = rb_first(&proc->nodes); n != NULL; n = rb_next(n))
5728 binder_inner_proc_unlock(proc);
5729 seq_printf(m, " nodes: %d\n", count);
5733 binder_proc_lock(proc);
5734 for (n = rb_first(&proc->refs_by_desc); n != NULL; n = rb_next(n)) {
5735 struct binder_ref *ref = rb_entry(n, struct binder_ref,
5738 strong += ref->data.strong;
5739 weak += ref->data.weak;
5741 binder_proc_unlock(proc);
5742 seq_printf(m, " refs: %d s %d w %d\n", count, strong, weak);
5744 count = binder_alloc_get_allocated_count(&proc->alloc);
5745 seq_printf(m, " buffers: %d\n", count);
5747 binder_alloc_print_pages(m, &proc->alloc);
5750 binder_inner_proc_lock(proc);
5751 list_for_each_entry(w, &proc->todo, entry) {
5752 if (w->type == BINDER_WORK_TRANSACTION)
5755 binder_inner_proc_unlock(proc);
5756 seq_printf(m, " pending transactions: %d\n", count);
5758 print_binder_stats(m, " ", &proc->stats);
5762 int binder_state_show(struct seq_file *m, void *unused)
5764 struct binder_proc *proc;
5765 struct binder_node *node;
5766 struct binder_node *last_node = NULL;
5768 seq_puts(m, "binder state:\n");
5770 spin_lock(&binder_dead_nodes_lock);
5771 if (!hlist_empty(&binder_dead_nodes))
5772 seq_puts(m, "dead nodes:\n");
5773 hlist_for_each_entry(node, &binder_dead_nodes, dead_node) {
5775 * take a temporary reference on the node so it
5776 * survives and isn't removed from the list
5777 * while we print it.
5780 spin_unlock(&binder_dead_nodes_lock);
5782 binder_put_node(last_node);
5783 binder_node_lock(node);
5784 print_binder_node_nilocked(m, node);
5785 binder_node_unlock(node);
5787 spin_lock(&binder_dead_nodes_lock);
5789 spin_unlock(&binder_dead_nodes_lock);
5791 binder_put_node(last_node);
5793 mutex_lock(&binder_procs_lock);
5794 hlist_for_each_entry(proc, &binder_procs, proc_node)
5795 print_binder_proc(m, proc, 1);
5796 mutex_unlock(&binder_procs_lock);
5801 int binder_stats_show(struct seq_file *m, void *unused)
5803 struct binder_proc *proc;
5805 seq_puts(m, "binder stats:\n");
5807 print_binder_stats(m, "", &binder_stats);
5809 mutex_lock(&binder_procs_lock);
5810 hlist_for_each_entry(proc, &binder_procs, proc_node)
5811 print_binder_proc_stats(m, proc);
5812 mutex_unlock(&binder_procs_lock);
5817 int binder_transactions_show(struct seq_file *m, void *unused)
5819 struct binder_proc *proc;
5821 seq_puts(m, "binder transactions:\n");
5822 mutex_lock(&binder_procs_lock);
5823 hlist_for_each_entry(proc, &binder_procs, proc_node)
5824 print_binder_proc(m, proc, 0);
5825 mutex_unlock(&binder_procs_lock);
5830 static int proc_show(struct seq_file *m, void *unused)
5832 struct binder_proc *itr;
5833 int pid = (unsigned long)m->private;
5835 mutex_lock(&binder_procs_lock);
5836 hlist_for_each_entry(itr, &binder_procs, proc_node) {
5837 if (itr->pid == pid) {
5838 seq_puts(m, "binder proc state:\n");
5839 print_binder_proc(m, itr, 1);
5842 mutex_unlock(&binder_procs_lock);
5847 static void print_binder_transaction_log_entry(struct seq_file *m,
5848 struct binder_transaction_log_entry *e)
5850 int debug_id = READ_ONCE(e->debug_id_done);
5852 * read barrier to guarantee debug_id_done read before
5853 * we print the log values
5857 "%d: %s from %d:%d to %d:%d context %s node %d handle %d size %d:%d ret %d/%d l=%d",
5858 e->debug_id, (e->call_type == 2) ? "reply" :
5859 ((e->call_type == 1) ? "async" : "call "), e->from_proc,
5860 e->from_thread, e->to_proc, e->to_thread, e->context_name,
5861 e->to_node, e->target_handle, e->data_size, e->offsets_size,
5862 e->return_error, e->return_error_param,
5863 e->return_error_line);
5865 * read-barrier to guarantee read of debug_id_done after
5866 * done printing the fields of the entry
5869 seq_printf(m, debug_id && debug_id == READ_ONCE(e->debug_id_done) ?
5870 "\n" : " (incomplete)\n");
5873 int binder_transaction_log_show(struct seq_file *m, void *unused)
5875 struct binder_transaction_log *log = m->private;
5876 unsigned int log_cur = atomic_read(&log->cur);
5881 count = log_cur + 1;
5882 cur = count < ARRAY_SIZE(log->entry) && !log->full ?
5883 0 : count % ARRAY_SIZE(log->entry);
5884 if (count > ARRAY_SIZE(log->entry) || log->full)
5885 count = ARRAY_SIZE(log->entry);
5886 for (i = 0; i < count; i++) {
5887 unsigned int index = cur++ % ARRAY_SIZE(log->entry);
5889 print_binder_transaction_log_entry(m, &log->entry[index]);
5894 const struct file_operations binder_fops = {
5895 .owner = THIS_MODULE,
5896 .poll = binder_poll,
5897 .unlocked_ioctl = binder_ioctl,
5898 .compat_ioctl = compat_ptr_ioctl,
5899 .mmap = binder_mmap,
5900 .open = binder_open,
5901 .flush = binder_flush,
5902 .release = binder_release,
5905 static int __init init_binder_device(const char *name)
5908 struct binder_device *binder_device;
5910 binder_device = kzalloc(sizeof(*binder_device), GFP_KERNEL);
5914 binder_device->miscdev.fops = &binder_fops;
5915 binder_device->miscdev.minor = MISC_DYNAMIC_MINOR;
5916 binder_device->miscdev.name = name;
5918 refcount_set(&binder_device->ref, 1);
5919 binder_device->context.binder_context_mgr_uid = INVALID_UID;
5920 binder_device->context.name = name;
5921 mutex_init(&binder_device->context.context_mgr_node_lock);
5923 ret = misc_register(&binder_device->miscdev);
5925 kfree(binder_device);
5929 hlist_add_head(&binder_device->hlist, &binder_devices);
5934 static int __init binder_init(void)
5937 char *device_name, *device_tmp;
5938 struct binder_device *device;
5939 struct hlist_node *tmp;
5940 char *device_names = NULL;
5942 ret = binder_alloc_shrinker_init();
5946 atomic_set(&binder_transaction_log.cur, ~0U);
5947 atomic_set(&binder_transaction_log_failed.cur, ~0U);
5949 binder_debugfs_dir_entry_root = debugfs_create_dir("binder", NULL);
5950 if (binder_debugfs_dir_entry_root)
5951 binder_debugfs_dir_entry_proc = debugfs_create_dir("proc",
5952 binder_debugfs_dir_entry_root);
5954 if (binder_debugfs_dir_entry_root) {
5955 debugfs_create_file("state",
5957 binder_debugfs_dir_entry_root,
5959 &binder_state_fops);
5960 debugfs_create_file("stats",
5962 binder_debugfs_dir_entry_root,
5964 &binder_stats_fops);
5965 debugfs_create_file("transactions",
5967 binder_debugfs_dir_entry_root,
5969 &binder_transactions_fops);
5970 debugfs_create_file("transaction_log",
5972 binder_debugfs_dir_entry_root,
5973 &binder_transaction_log,
5974 &binder_transaction_log_fops);
5975 debugfs_create_file("failed_transaction_log",
5977 binder_debugfs_dir_entry_root,
5978 &binder_transaction_log_failed,
5979 &binder_transaction_log_fops);
5982 if (!IS_ENABLED(CONFIG_ANDROID_BINDERFS) &&
5983 strcmp(binder_devices_param, "") != 0) {
5985 * Copy the module_parameter string, because we don't want to
5986 * tokenize it in-place.
5988 device_names = kstrdup(binder_devices_param, GFP_KERNEL);
5989 if (!device_names) {
5991 goto err_alloc_device_names_failed;
5994 device_tmp = device_names;
5995 while ((device_name = strsep(&device_tmp, ","))) {
5996 ret = init_binder_device(device_name);
5998 goto err_init_binder_device_failed;
6002 ret = init_binderfs();
6004 goto err_init_binder_device_failed;
6008 err_init_binder_device_failed:
6009 hlist_for_each_entry_safe(device, tmp, &binder_devices, hlist) {
6010 misc_deregister(&device->miscdev);
6011 hlist_del(&device->hlist);
6015 kfree(device_names);
6017 err_alloc_device_names_failed:
6018 debugfs_remove_recursive(binder_debugfs_dir_entry_root);
6023 device_initcall(binder_init);
6025 #define CREATE_TRACE_POINTS
6026 #include "binder_trace.h"
6028 MODULE_LICENSE("GPL v2");