2 Copyright (C) 2002 Richard Henderson
3 Copyright (C) 2001 Rusty Russell, 2002 Rusty Russell IBM.
5 This program is free software; you can redistribute it and/or modify
6 it under the terms of the GNU General Public License as published by
7 the Free Software Foundation; either version 2 of the License, or
8 (at your option) any later version.
10 This program is distributed in the hope that it will be useful,
11 but WITHOUT ANY WARRANTY; without even the implied warranty of
12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
13 GNU General Public License for more details.
15 You should have received a copy of the GNU General Public License
16 along with this program; if not, write to the Free Software
17 Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
19 #include <linux/module.h>
20 #include <linux/moduleloader.h>
21 #include <linux/ftrace_event.h>
22 #include <linux/init.h>
23 #include <linux/kallsyms.h>
25 #include <linux/sysfs.h>
26 #include <linux/kernel.h>
27 #include <linux/slab.h>
28 #include <linux/vmalloc.h>
29 #include <linux/elf.h>
30 #include <linux/proc_fs.h>
31 #include <linux/seq_file.h>
32 #include <linux/syscalls.h>
33 #include <linux/fcntl.h>
34 #include <linux/rcupdate.h>
35 #include <linux/capability.h>
36 #include <linux/cpu.h>
37 #include <linux/moduleparam.h>
38 #include <linux/errno.h>
39 #include <linux/err.h>
40 #include <linux/vermagic.h>
41 #include <linux/notifier.h>
42 #include <linux/sched.h>
43 #include <linux/stop_machine.h>
44 #include <linux/device.h>
45 #include <linux/string.h>
46 #include <linux/mutex.h>
47 #include <linux/rculist.h>
48 #include <asm/uaccess.h>
49 #include <asm/cacheflush.h>
50 #include <asm/mmu_context.h>
51 #include <linux/license.h>
52 #include <asm/sections.h>
53 #include <linux/tracepoint.h>
54 #include <linux/ftrace.h>
55 #include <linux/async.h>
56 #include <linux/percpu.h>
57 #include <linux/kmemleak.h>
59 #define CREATE_TRACE_POINTS
60 #include <trace/events/module.h>
65 #define DEBUGP(fmt , a...)
68 #ifndef ARCH_SHF_SMALL
69 #define ARCH_SHF_SMALL 0
72 /* If this is set, the section belongs in the init part of the module */
73 #define INIT_OFFSET_MASK (1UL << (BITS_PER_LONG-1))
77 * 1) List of modules (also safely readable with preempt_disable),
78 * 2) module_use links,
79 * 3) module_addr_min/module_addr_max.
80 * (delete uses stop_machine/add uses RCU list operations). */
81 DEFINE_MUTEX(module_mutex);
82 EXPORT_SYMBOL_GPL(module_mutex);
83 static LIST_HEAD(modules);
84 #ifdef CONFIG_KGDB_KDB
85 struct list_head *kdb_modules = &modules; /* kdb needs the list of modules */
86 #endif /* CONFIG_KGDB_KDB */
89 /* Block module loading/unloading? */
90 int modules_disabled = 0;
92 /* Waiting for a module to finish initializing? */
93 static DECLARE_WAIT_QUEUE_HEAD(module_wq);
95 static BLOCKING_NOTIFIER_HEAD(module_notify_list);
97 /* Bounds of module allocation, for speeding __module_address.
98 * Protected by module_mutex. */
99 static unsigned long module_addr_min = -1UL, module_addr_max = 0;
101 int register_module_notifier(struct notifier_block * nb)
103 return blocking_notifier_chain_register(&module_notify_list, nb);
105 EXPORT_SYMBOL(register_module_notifier);
107 int unregister_module_notifier(struct notifier_block * nb)
109 return blocking_notifier_chain_unregister(&module_notify_list, nb);
111 EXPORT_SYMBOL(unregister_module_notifier);
113 /* We require a truly strong try_module_get(): 0 means failure due to
114 ongoing or failed initialization etc. */
115 static inline int strong_try_module_get(struct module *mod)
117 if (mod && mod->state == MODULE_STATE_COMING)
119 if (try_module_get(mod))
125 static inline void add_taint_module(struct module *mod, unsigned flag)
128 mod->taints |= (1U << flag);
132 * A thread that wants to hold a reference to a module only while it
133 * is running can call this to safely exit. nfsd and lockd use this.
135 void __module_put_and_exit(struct module *mod, long code)
140 EXPORT_SYMBOL(__module_put_and_exit);
142 /* Find a module section: 0 means not found. */
143 static unsigned int find_sec(Elf_Ehdr *hdr,
145 const char *secstrings,
150 for (i = 1; i < hdr->e_shnum; i++)
151 /* Alloc bit cleared means "ignore it." */
152 if ((sechdrs[i].sh_flags & SHF_ALLOC)
153 && strcmp(secstrings+sechdrs[i].sh_name, name) == 0)
158 /* Find a module section, or NULL. */
159 static void *section_addr(Elf_Ehdr *hdr, Elf_Shdr *shdrs,
160 const char *secstrings, const char *name)
162 /* Section 0 has sh_addr 0. */
163 return (void *)shdrs[find_sec(hdr, shdrs, secstrings, name)].sh_addr;
166 /* Find a module section, or NULL. Fill in number of "objects" in section. */
167 static void *section_objs(Elf_Ehdr *hdr,
169 const char *secstrings,
174 unsigned int sec = find_sec(hdr, sechdrs, secstrings, name);
176 /* Section 0 has sh_addr 0 and sh_size 0. */
177 *num = sechdrs[sec].sh_size / object_size;
178 return (void *)sechdrs[sec].sh_addr;
181 /* Provided by the linker */
182 extern const struct kernel_symbol __start___ksymtab[];
183 extern const struct kernel_symbol __stop___ksymtab[];
184 extern const struct kernel_symbol __start___ksymtab_gpl[];
185 extern const struct kernel_symbol __stop___ksymtab_gpl[];
186 extern const struct kernel_symbol __start___ksymtab_gpl_future[];
187 extern const struct kernel_symbol __stop___ksymtab_gpl_future[];
188 extern const unsigned long __start___kcrctab[];
189 extern const unsigned long __start___kcrctab_gpl[];
190 extern const unsigned long __start___kcrctab_gpl_future[];
191 #ifdef CONFIG_UNUSED_SYMBOLS
192 extern const struct kernel_symbol __start___ksymtab_unused[];
193 extern const struct kernel_symbol __stop___ksymtab_unused[];
194 extern const struct kernel_symbol __start___ksymtab_unused_gpl[];
195 extern const struct kernel_symbol __stop___ksymtab_unused_gpl[];
196 extern const unsigned long __start___kcrctab_unused[];
197 extern const unsigned long __start___kcrctab_unused_gpl[];
200 #ifndef CONFIG_MODVERSIONS
201 #define symversion(base, idx) NULL
203 #define symversion(base, idx) ((base != NULL) ? ((base) + (idx)) : NULL)
206 static bool each_symbol_in_section(const struct symsearch *arr,
207 unsigned int arrsize,
208 struct module *owner,
209 bool (*fn)(const struct symsearch *syms,
210 struct module *owner,
211 unsigned int symnum, void *data),
216 for (j = 0; j < arrsize; j++) {
217 for (i = 0; i < arr[j].stop - arr[j].start; i++)
218 if (fn(&arr[j], owner, i, data))
225 /* Returns true as soon as fn returns true, otherwise false. */
226 bool each_symbol(bool (*fn)(const struct symsearch *arr, struct module *owner,
227 unsigned int symnum, void *data), void *data)
230 const struct symsearch arr[] = {
231 { __start___ksymtab, __stop___ksymtab, __start___kcrctab,
232 NOT_GPL_ONLY, false },
233 { __start___ksymtab_gpl, __stop___ksymtab_gpl,
234 __start___kcrctab_gpl,
236 { __start___ksymtab_gpl_future, __stop___ksymtab_gpl_future,
237 __start___kcrctab_gpl_future,
238 WILL_BE_GPL_ONLY, false },
239 #ifdef CONFIG_UNUSED_SYMBOLS
240 { __start___ksymtab_unused, __stop___ksymtab_unused,
241 __start___kcrctab_unused,
242 NOT_GPL_ONLY, true },
243 { __start___ksymtab_unused_gpl, __stop___ksymtab_unused_gpl,
244 __start___kcrctab_unused_gpl,
249 if (each_symbol_in_section(arr, ARRAY_SIZE(arr), NULL, fn, data))
252 list_for_each_entry_rcu(mod, &modules, list) {
253 struct symsearch arr[] = {
254 { mod->syms, mod->syms + mod->num_syms, mod->crcs,
255 NOT_GPL_ONLY, false },
256 { mod->gpl_syms, mod->gpl_syms + mod->num_gpl_syms,
259 { mod->gpl_future_syms,
260 mod->gpl_future_syms + mod->num_gpl_future_syms,
261 mod->gpl_future_crcs,
262 WILL_BE_GPL_ONLY, false },
263 #ifdef CONFIG_UNUSED_SYMBOLS
265 mod->unused_syms + mod->num_unused_syms,
267 NOT_GPL_ONLY, true },
268 { mod->unused_gpl_syms,
269 mod->unused_gpl_syms + mod->num_unused_gpl_syms,
270 mod->unused_gpl_crcs,
275 if (each_symbol_in_section(arr, ARRAY_SIZE(arr), mod, fn, data))
280 EXPORT_SYMBOL_GPL(each_symbol);
282 struct find_symbol_arg {
289 struct module *owner;
290 const unsigned long *crc;
291 const struct kernel_symbol *sym;
294 static bool find_symbol_in_section(const struct symsearch *syms,
295 struct module *owner,
296 unsigned int symnum, void *data)
298 struct find_symbol_arg *fsa = data;
300 if (strcmp(syms->start[symnum].name, fsa->name) != 0)
304 if (syms->licence == GPL_ONLY)
306 if (syms->licence == WILL_BE_GPL_ONLY && fsa->warn) {
307 printk(KERN_WARNING "Symbol %s is being used "
308 "by a non-GPL module, which will not "
309 "be allowed in the future\n", fsa->name);
310 printk(KERN_WARNING "Please see the file "
311 "Documentation/feature-removal-schedule.txt "
312 "in the kernel source tree for more details.\n");
316 #ifdef CONFIG_UNUSED_SYMBOLS
317 if (syms->unused && fsa->warn) {
318 printk(KERN_WARNING "Symbol %s is marked as UNUSED, "
319 "however this module is using it.\n", fsa->name);
321 "This symbol will go away in the future.\n");
323 "Please evalute if this is the right api to use and if "
324 "it really is, submit a report the linux kernel "
325 "mailinglist together with submitting your code for "
331 fsa->crc = symversion(syms->crcs, symnum);
332 fsa->sym = &syms->start[symnum];
336 /* Find a symbol and return it, along with, (optional) crc and
337 * (optional) module which owns it. Needs preempt disabled or module_mutex. */
338 const struct kernel_symbol *find_symbol(const char *name,
339 struct module **owner,
340 const unsigned long **crc,
344 struct find_symbol_arg fsa;
350 if (each_symbol(find_symbol_in_section, &fsa)) {
358 DEBUGP("Failed to find symbol %s\n", name);
361 EXPORT_SYMBOL_GPL(find_symbol);
363 /* Search for module by name: must hold module_mutex. */
364 struct module *find_module(const char *name)
368 list_for_each_entry(mod, &modules, list) {
369 if (strcmp(mod->name, name) == 0)
374 EXPORT_SYMBOL_GPL(find_module);
378 static inline void __percpu *mod_percpu(struct module *mod)
383 static int percpu_modalloc(struct module *mod,
384 unsigned long size, unsigned long align)
386 if (align > PAGE_SIZE) {
387 printk(KERN_WARNING "%s: per-cpu alignment %li > %li\n",
388 mod->name, align, PAGE_SIZE);
392 mod->percpu = __alloc_reserved_percpu(size, align);
395 "Could not allocate %lu bytes percpu data\n", size);
398 mod->percpu_size = size;
402 static void percpu_modfree(struct module *mod)
404 free_percpu(mod->percpu);
407 static unsigned int find_pcpusec(Elf_Ehdr *hdr,
409 const char *secstrings)
411 return find_sec(hdr, sechdrs, secstrings, ".data..percpu");
414 static void percpu_modcopy(struct module *mod,
415 const void *from, unsigned long size)
419 for_each_possible_cpu(cpu)
420 memcpy(per_cpu_ptr(mod->percpu, cpu), from, size);
424 * is_module_percpu_address - test whether address is from module static percpu
425 * @addr: address to test
427 * Test whether @addr belongs to module static percpu area.
430 * %true if @addr is from module static percpu area
432 bool is_module_percpu_address(unsigned long addr)
439 list_for_each_entry_rcu(mod, &modules, list) {
440 if (!mod->percpu_size)
442 for_each_possible_cpu(cpu) {
443 void *start = per_cpu_ptr(mod->percpu, cpu);
445 if ((void *)addr >= start &&
446 (void *)addr < start + mod->percpu_size) {
457 #else /* ... !CONFIG_SMP */
459 static inline void __percpu *mod_percpu(struct module *mod)
463 static inline int percpu_modalloc(struct module *mod,
464 unsigned long size, unsigned long align)
468 static inline void percpu_modfree(struct module *mod)
471 static inline unsigned int find_pcpusec(Elf_Ehdr *hdr,
473 const char *secstrings)
477 static inline void percpu_modcopy(struct module *mod,
478 const void *from, unsigned long size)
480 /* pcpusec should be 0, and size of that section should be 0. */
483 bool is_module_percpu_address(unsigned long addr)
488 #endif /* CONFIG_SMP */
490 #define MODINFO_ATTR(field) \
491 static void setup_modinfo_##field(struct module *mod, const char *s) \
493 mod->field = kstrdup(s, GFP_KERNEL); \
495 static ssize_t show_modinfo_##field(struct module_attribute *mattr, \
496 struct module *mod, char *buffer) \
498 return sprintf(buffer, "%s\n", mod->field); \
500 static int modinfo_##field##_exists(struct module *mod) \
502 return mod->field != NULL; \
504 static void free_modinfo_##field(struct module *mod) \
509 static struct module_attribute modinfo_##field = { \
510 .attr = { .name = __stringify(field), .mode = 0444 }, \
511 .show = show_modinfo_##field, \
512 .setup = setup_modinfo_##field, \
513 .test = modinfo_##field##_exists, \
514 .free = free_modinfo_##field, \
517 MODINFO_ATTR(version);
518 MODINFO_ATTR(srcversion);
520 static char last_unloaded_module[MODULE_NAME_LEN+1];
522 #ifdef CONFIG_MODULE_UNLOAD
524 EXPORT_TRACEPOINT_SYMBOL(module_get);
526 /* Init the unload section of the module. */
527 static void module_unload_init(struct module *mod)
531 INIT_LIST_HEAD(&mod->source_list);
532 INIT_LIST_HEAD(&mod->target_list);
533 for_each_possible_cpu(cpu) {
534 per_cpu_ptr(mod->refptr, cpu)->incs = 0;
535 per_cpu_ptr(mod->refptr, cpu)->decs = 0;
538 /* Hold reference count during initialization. */
539 __this_cpu_write(mod->refptr->incs, 1);
540 /* Backwards compatibility macros put refcount during init. */
541 mod->waiter = current;
544 /* Does a already use b? */
545 static int already_uses(struct module *a, struct module *b)
547 struct module_use *use;
549 list_for_each_entry(use, &b->source_list, source_list) {
550 if (use->source == a) {
551 DEBUGP("%s uses %s!\n", a->name, b->name);
555 DEBUGP("%s does not use %s!\n", a->name, b->name);
561 * - we add 'a' as a "source", 'b' as a "target" of module use
562 * - the module_use is added to the list of 'b' sources (so
563 * 'b' can walk the list to see who sourced them), and of 'a'
564 * targets (so 'a' can see what modules it targets).
566 static int add_module_usage(struct module *a, struct module *b)
568 struct module_use *use;
570 DEBUGP("Allocating new usage for %s.\n", a->name);
571 use = kmalloc(sizeof(*use), GFP_ATOMIC);
573 printk(KERN_WARNING "%s: out of memory loading\n", a->name);
579 list_add(&use->source_list, &b->source_list);
580 list_add(&use->target_list, &a->target_list);
584 /* Module a uses b: caller needs module_mutex() */
585 int use_module(struct module *a, struct module *b)
589 if (b == NULL || already_uses(a, b)) return 1;
591 /* If we're interrupted or time out, we fail. */
592 if (wait_event_interruptible_timeout(
593 module_wq, (err = strong_try_module_get(b)) != -EBUSY,
595 printk("%s: gave up waiting for init of module %s.\n",
600 /* If strong_try_module_get() returned a different error, we fail. */
604 err = add_module_usage(a, b);
611 EXPORT_SYMBOL_GPL(use_module);
613 /* Clear the unload stuff of the module. */
614 static void module_unload_free(struct module *mod)
616 struct module_use *use, *tmp;
618 mutex_lock(&module_mutex);
619 list_for_each_entry_safe(use, tmp, &mod->target_list, target_list) {
620 struct module *i = use->target;
621 DEBUGP("%s unusing %s\n", mod->name, i->name);
623 list_del(&use->source_list);
624 list_del(&use->target_list);
627 mutex_unlock(&module_mutex);
630 #ifdef CONFIG_MODULE_FORCE_UNLOAD
631 static inline int try_force_unload(unsigned int flags)
633 int ret = (flags & O_TRUNC);
635 add_taint(TAINT_FORCED_RMMOD);
639 static inline int try_force_unload(unsigned int flags)
643 #endif /* CONFIG_MODULE_FORCE_UNLOAD */
652 /* Whole machine is stopped with interrupts off when this runs. */
653 static int __try_stop_module(void *_sref)
655 struct stopref *sref = _sref;
657 /* If it's not unused, quit unless we're forcing. */
658 if (module_refcount(sref->mod) != 0) {
659 if (!(*sref->forced = try_force_unload(sref->flags)))
663 /* Mark it as dying. */
664 sref->mod->state = MODULE_STATE_GOING;
668 static int try_stop_module(struct module *mod, int flags, int *forced)
670 if (flags & O_NONBLOCK) {
671 struct stopref sref = { mod, flags, forced };
673 return stop_machine(__try_stop_module, &sref, NULL);
675 /* We don't need to stop the machine for this. */
676 mod->state = MODULE_STATE_GOING;
682 unsigned int module_refcount(struct module *mod)
684 unsigned int incs = 0, decs = 0;
687 for_each_possible_cpu(cpu)
688 decs += per_cpu_ptr(mod->refptr, cpu)->decs;
690 * ensure the incs are added up after the decs.
691 * module_put ensures incs are visible before decs with smp_wmb.
693 * This 2-count scheme avoids the situation where the refcount
694 * for CPU0 is read, then CPU0 increments the module refcount,
695 * then CPU1 drops that refcount, then the refcount for CPU1 is
696 * read. We would record a decrement but not its corresponding
697 * increment so we would see a low count (disaster).
699 * Rare situation? But module_refcount can be preempted, and we
700 * might be tallying up 4096+ CPUs. So it is not impossible.
703 for_each_possible_cpu(cpu)
704 incs += per_cpu_ptr(mod->refptr, cpu)->incs;
707 EXPORT_SYMBOL(module_refcount);
709 /* This exists whether we can unload or not */
710 static void free_module(struct module *mod);
712 static void wait_for_zero_refcount(struct module *mod)
714 /* Since we might sleep for some time, release the mutex first */
715 mutex_unlock(&module_mutex);
717 DEBUGP("Looking at refcount...\n");
718 set_current_state(TASK_UNINTERRUPTIBLE);
719 if (module_refcount(mod) == 0)
723 current->state = TASK_RUNNING;
724 mutex_lock(&module_mutex);
727 SYSCALL_DEFINE2(delete_module, const char __user *, name_user,
731 char name[MODULE_NAME_LEN];
734 if (!capable(CAP_SYS_MODULE) || modules_disabled)
737 if (strncpy_from_user(name, name_user, MODULE_NAME_LEN-1) < 0)
739 name[MODULE_NAME_LEN-1] = '\0';
741 if (mutex_lock_interruptible(&module_mutex) != 0)
744 mod = find_module(name);
750 if (!list_empty(&mod->source_list)) {
751 /* Other modules depend on us: get rid of them first. */
756 /* Doing init or already dying? */
757 if (mod->state != MODULE_STATE_LIVE) {
758 /* FIXME: if (force), slam module count and wake up
760 DEBUGP("%s already dying\n", mod->name);
765 /* If it has an init func, it must have an exit func to unload */
766 if (mod->init && !mod->exit) {
767 forced = try_force_unload(flags);
769 /* This module can't be removed */
775 /* Set this up before setting mod->state */
776 mod->waiter = current;
778 /* Stop the machine so refcounts can't move and disable module. */
779 ret = try_stop_module(mod, flags, &forced);
783 /* Never wait if forced. */
784 if (!forced && module_refcount(mod) != 0)
785 wait_for_zero_refcount(mod);
787 mutex_unlock(&module_mutex);
788 /* Final destruction now noone is using it. */
789 if (mod->exit != NULL)
791 blocking_notifier_call_chain(&module_notify_list,
792 MODULE_STATE_GOING, mod);
793 async_synchronize_full();
795 /* Store the name of the last unloaded module for diagnostic purposes */
796 strlcpy(last_unloaded_module, mod->name, sizeof(last_unloaded_module));
797 ddebug_remove_module(mod->name);
802 mutex_unlock(&module_mutex);
806 static inline void print_unload_info(struct seq_file *m, struct module *mod)
808 struct module_use *use;
809 int printed_something = 0;
811 seq_printf(m, " %u ", module_refcount(mod));
813 /* Always include a trailing , so userspace can differentiate
814 between this and the old multi-field proc format. */
815 list_for_each_entry(use, &mod->source_list, source_list) {
816 printed_something = 1;
817 seq_printf(m, "%s,", use->source->name);
820 if (mod->init != NULL && mod->exit == NULL) {
821 printed_something = 1;
822 seq_printf(m, "[permanent],");
825 if (!printed_something)
829 void __symbol_put(const char *symbol)
831 struct module *owner;
834 if (!find_symbol(symbol, &owner, NULL, true, false))
839 EXPORT_SYMBOL(__symbol_put);
841 /* Note this assumes addr is a function, which it currently always is. */
842 void symbol_put_addr(void *addr)
844 struct module *modaddr;
845 unsigned long a = (unsigned long)dereference_function_descriptor(addr);
847 if (core_kernel_text(a))
850 /* module_text_address is safe here: we're supposed to have reference
851 * to module from symbol_get, so it can't go away. */
852 modaddr = __module_text_address(a);
856 EXPORT_SYMBOL_GPL(symbol_put_addr);
858 static ssize_t show_refcnt(struct module_attribute *mattr,
859 struct module *mod, char *buffer)
861 return sprintf(buffer, "%u\n", module_refcount(mod));
864 static struct module_attribute refcnt = {
865 .attr = { .name = "refcnt", .mode = 0444 },
869 void module_put(struct module *module)
873 smp_wmb(); /* see comment in module_refcount */
874 __this_cpu_inc(module->refptr->decs);
876 trace_module_put(module, _RET_IP_);
877 /* Maybe they're waiting for us to drop reference? */
878 if (unlikely(!module_is_live(module)))
879 wake_up_process(module->waiter);
883 EXPORT_SYMBOL(module_put);
885 #else /* !CONFIG_MODULE_UNLOAD */
886 static inline void print_unload_info(struct seq_file *m, struct module *mod)
888 /* We don't know the usage count, or what modules are using. */
889 seq_printf(m, " - -");
892 static inline void module_unload_free(struct module *mod)
896 int use_module(struct module *a, struct module *b)
898 return strong_try_module_get(b) == 0;
900 EXPORT_SYMBOL_GPL(use_module);
902 static inline void module_unload_init(struct module *mod)
905 #endif /* CONFIG_MODULE_UNLOAD */
907 static ssize_t show_initstate(struct module_attribute *mattr,
908 struct module *mod, char *buffer)
910 const char *state = "unknown";
912 switch (mod->state) {
913 case MODULE_STATE_LIVE:
916 case MODULE_STATE_COMING:
919 case MODULE_STATE_GOING:
923 return sprintf(buffer, "%s\n", state);
926 static struct module_attribute initstate = {
927 .attr = { .name = "initstate", .mode = 0444 },
928 .show = show_initstate,
931 static struct module_attribute *modinfo_attrs[] = {
935 #ifdef CONFIG_MODULE_UNLOAD
941 static const char vermagic[] = VERMAGIC_STRING;
943 static int try_to_force_load(struct module *mod, const char *reason)
945 #ifdef CONFIG_MODULE_FORCE_LOAD
946 if (!test_taint(TAINT_FORCED_MODULE))
947 printk(KERN_WARNING "%s: %s: kernel tainted.\n",
949 add_taint_module(mod, TAINT_FORCED_MODULE);
956 #ifdef CONFIG_MODVERSIONS
957 /* If the arch applies (non-zero) relocations to kernel kcrctab, unapply it. */
958 static unsigned long maybe_relocated(unsigned long crc,
959 const struct module *crc_owner)
961 #ifdef ARCH_RELOCATES_KCRCTAB
962 if (crc_owner == NULL)
963 return crc - (unsigned long)reloc_start;
968 static int check_version(Elf_Shdr *sechdrs,
969 unsigned int versindex,
972 const unsigned long *crc,
973 const struct module *crc_owner)
975 unsigned int i, num_versions;
976 struct modversion_info *versions;
978 /* Exporting module didn't supply crcs? OK, we're already tainted. */
982 /* No versions at all? modprobe --force does this. */
984 return try_to_force_load(mod, symname) == 0;
986 versions = (void *) sechdrs[versindex].sh_addr;
987 num_versions = sechdrs[versindex].sh_size
988 / sizeof(struct modversion_info);
990 for (i = 0; i < num_versions; i++) {
991 if (strcmp(versions[i].name, symname) != 0)
994 if (versions[i].crc == maybe_relocated(*crc, crc_owner))
996 DEBUGP("Found checksum %lX vs module %lX\n",
997 maybe_relocated(*crc, crc_owner), versions[i].crc);
1001 printk(KERN_WARNING "%s: no symbol version for %s\n",
1002 mod->name, symname);
1006 printk("%s: disagrees about version of symbol %s\n",
1007 mod->name, symname);
1011 static inline int check_modstruct_version(Elf_Shdr *sechdrs,
1012 unsigned int versindex,
1015 const unsigned long *crc;
1017 /* Since this should be found in kernel (which can't be removed),
1018 * no locking is necessary. */
1019 if (!find_symbol(MODULE_SYMBOL_PREFIX "module_layout", NULL,
1022 return check_version(sechdrs, versindex, "module_layout", mod, crc,
1026 /* First part is kernel version, which we ignore if module has crcs. */
1027 static inline int same_magic(const char *amagic, const char *bmagic,
1031 amagic += strcspn(amagic, " ");
1032 bmagic += strcspn(bmagic, " ");
1034 return strcmp(amagic, bmagic) == 0;
1037 static inline int check_version(Elf_Shdr *sechdrs,
1038 unsigned int versindex,
1039 const char *symname,
1041 const unsigned long *crc,
1042 const struct module *crc_owner)
1047 static inline int check_modstruct_version(Elf_Shdr *sechdrs,
1048 unsigned int versindex,
1054 static inline int same_magic(const char *amagic, const char *bmagic,
1057 return strcmp(amagic, bmagic) == 0;
1059 #endif /* CONFIG_MODVERSIONS */
1061 /* Resolve a symbol for this module. I.e. if we find one, record usage. */
1062 static const struct kernel_symbol *resolve_symbol(Elf_Shdr *sechdrs,
1063 unsigned int versindex,
1067 struct module *owner;
1068 const struct kernel_symbol *sym;
1069 const unsigned long *crc;
1071 mutex_lock(&module_mutex);
1072 sym = find_symbol(name, &owner, &crc,
1073 !(mod->taints & (1 << TAINT_PROPRIETARY_MODULE)), true);
1074 /* use_module can fail due to OOM,
1075 or module initialization or unloading */
1077 if (!check_version(sechdrs, versindex, name, mod, crc, owner)
1078 || !use_module(mod, owner))
1081 mutex_unlock(&module_mutex);
1086 * /sys/module/foo/sections stuff
1087 * J. Corbet <corbet@lwn.net>
1089 #if defined(CONFIG_KALLSYMS) && defined(CONFIG_SYSFS)
1091 static inline bool sect_empty(const Elf_Shdr *sect)
1093 return !(sect->sh_flags & SHF_ALLOC) || sect->sh_size == 0;
1096 struct module_sect_attr
1098 struct module_attribute mattr;
1100 unsigned long address;
1103 struct module_sect_attrs
1105 struct attribute_group grp;
1106 unsigned int nsections;
1107 struct module_sect_attr attrs[0];
1110 static ssize_t module_sect_show(struct module_attribute *mattr,
1111 struct module *mod, char *buf)
1113 struct module_sect_attr *sattr =
1114 container_of(mattr, struct module_sect_attr, mattr);
1115 return sprintf(buf, "0x%lx\n", sattr->address);
1118 static void free_sect_attrs(struct module_sect_attrs *sect_attrs)
1120 unsigned int section;
1122 for (section = 0; section < sect_attrs->nsections; section++)
1123 kfree(sect_attrs->attrs[section].name);
1127 static void add_sect_attrs(struct module *mod, unsigned int nsect,
1128 char *secstrings, Elf_Shdr *sechdrs)
1130 unsigned int nloaded = 0, i, size[2];
1131 struct module_sect_attrs *sect_attrs;
1132 struct module_sect_attr *sattr;
1133 struct attribute **gattr;
1135 /* Count loaded sections and allocate structures */
1136 for (i = 0; i < nsect; i++)
1137 if (!sect_empty(&sechdrs[i]))
1139 size[0] = ALIGN(sizeof(*sect_attrs)
1140 + nloaded * sizeof(sect_attrs->attrs[0]),
1141 sizeof(sect_attrs->grp.attrs[0]));
1142 size[1] = (nloaded + 1) * sizeof(sect_attrs->grp.attrs[0]);
1143 sect_attrs = kzalloc(size[0] + size[1], GFP_KERNEL);
1144 if (sect_attrs == NULL)
1147 /* Setup section attributes. */
1148 sect_attrs->grp.name = "sections";
1149 sect_attrs->grp.attrs = (void *)sect_attrs + size[0];
1151 sect_attrs->nsections = 0;
1152 sattr = §_attrs->attrs[0];
1153 gattr = §_attrs->grp.attrs[0];
1154 for (i = 0; i < nsect; i++) {
1155 if (sect_empty(&sechdrs[i]))
1157 sattr->address = sechdrs[i].sh_addr;
1158 sattr->name = kstrdup(secstrings + sechdrs[i].sh_name,
1160 if (sattr->name == NULL)
1162 sect_attrs->nsections++;
1163 sysfs_attr_init(&sattr->mattr.attr);
1164 sattr->mattr.show = module_sect_show;
1165 sattr->mattr.store = NULL;
1166 sattr->mattr.attr.name = sattr->name;
1167 sattr->mattr.attr.mode = S_IRUGO;
1168 *(gattr++) = &(sattr++)->mattr.attr;
1172 if (sysfs_create_group(&mod->mkobj.kobj, §_attrs->grp))
1175 mod->sect_attrs = sect_attrs;
1178 free_sect_attrs(sect_attrs);
1181 static void remove_sect_attrs(struct module *mod)
1183 if (mod->sect_attrs) {
1184 sysfs_remove_group(&mod->mkobj.kobj,
1185 &mod->sect_attrs->grp);
1186 /* We are positive that no one is using any sect attrs
1187 * at this point. Deallocate immediately. */
1188 free_sect_attrs(mod->sect_attrs);
1189 mod->sect_attrs = NULL;
1194 * /sys/module/foo/notes/.section.name gives contents of SHT_NOTE sections.
1197 struct module_notes_attrs {
1198 struct kobject *dir;
1200 struct bin_attribute attrs[0];
1203 static ssize_t module_notes_read(struct file *filp, struct kobject *kobj,
1204 struct bin_attribute *bin_attr,
1205 char *buf, loff_t pos, size_t count)
1208 * The caller checked the pos and count against our size.
1210 memcpy(buf, bin_attr->private + pos, count);
1214 static void free_notes_attrs(struct module_notes_attrs *notes_attrs,
1217 if (notes_attrs->dir) {
1219 sysfs_remove_bin_file(notes_attrs->dir,
1220 ¬es_attrs->attrs[i]);
1221 kobject_put(notes_attrs->dir);
1226 static void add_notes_attrs(struct module *mod, unsigned int nsect,
1227 char *secstrings, Elf_Shdr *sechdrs)
1229 unsigned int notes, loaded, i;
1230 struct module_notes_attrs *notes_attrs;
1231 struct bin_attribute *nattr;
1233 /* failed to create section attributes, so can't create notes */
1234 if (!mod->sect_attrs)
1237 /* Count notes sections and allocate structures. */
1239 for (i = 0; i < nsect; i++)
1240 if (!sect_empty(&sechdrs[i]) &&
1241 (sechdrs[i].sh_type == SHT_NOTE))
1247 notes_attrs = kzalloc(sizeof(*notes_attrs)
1248 + notes * sizeof(notes_attrs->attrs[0]),
1250 if (notes_attrs == NULL)
1253 notes_attrs->notes = notes;
1254 nattr = ¬es_attrs->attrs[0];
1255 for (loaded = i = 0; i < nsect; ++i) {
1256 if (sect_empty(&sechdrs[i]))
1258 if (sechdrs[i].sh_type == SHT_NOTE) {
1259 sysfs_bin_attr_init(nattr);
1260 nattr->attr.name = mod->sect_attrs->attrs[loaded].name;
1261 nattr->attr.mode = S_IRUGO;
1262 nattr->size = sechdrs[i].sh_size;
1263 nattr->private = (void *) sechdrs[i].sh_addr;
1264 nattr->read = module_notes_read;
1270 notes_attrs->dir = kobject_create_and_add("notes", &mod->mkobj.kobj);
1271 if (!notes_attrs->dir)
1274 for (i = 0; i < notes; ++i)
1275 if (sysfs_create_bin_file(notes_attrs->dir,
1276 ¬es_attrs->attrs[i]))
1279 mod->notes_attrs = notes_attrs;
1283 free_notes_attrs(notes_attrs, i);
1286 static void remove_notes_attrs(struct module *mod)
1288 if (mod->notes_attrs)
1289 free_notes_attrs(mod->notes_attrs, mod->notes_attrs->notes);
1294 static inline void add_sect_attrs(struct module *mod, unsigned int nsect,
1295 char *sectstrings, Elf_Shdr *sechdrs)
1299 static inline void remove_sect_attrs(struct module *mod)
1303 static inline void add_notes_attrs(struct module *mod, unsigned int nsect,
1304 char *sectstrings, Elf_Shdr *sechdrs)
1308 static inline void remove_notes_attrs(struct module *mod)
1314 static void add_usage_links(struct module *mod)
1316 #ifdef CONFIG_MODULE_UNLOAD
1317 struct module_use *use;
1320 mutex_lock(&module_mutex);
1321 list_for_each_entry(use, &mod->target_list, target_list) {
1322 nowarn = sysfs_create_link(use->target->holders_dir,
1323 &mod->mkobj.kobj, mod->name);
1325 mutex_unlock(&module_mutex);
1329 static void del_usage_links(struct module *mod)
1331 #ifdef CONFIG_MODULE_UNLOAD
1332 struct module_use *use;
1334 mutex_lock(&module_mutex);
1335 list_for_each_entry(use, &mod->target_list, target_list)
1336 sysfs_remove_link(use->target->holders_dir, mod->name);
1337 mutex_unlock(&module_mutex);
1341 static int module_add_modinfo_attrs(struct module *mod)
1343 struct module_attribute *attr;
1344 struct module_attribute *temp_attr;
1348 mod->modinfo_attrs = kzalloc((sizeof(struct module_attribute) *
1349 (ARRAY_SIZE(modinfo_attrs) + 1)),
1351 if (!mod->modinfo_attrs)
1354 temp_attr = mod->modinfo_attrs;
1355 for (i = 0; (attr = modinfo_attrs[i]) && !error; i++) {
1357 (attr->test && attr->test(mod))) {
1358 memcpy(temp_attr, attr, sizeof(*temp_attr));
1359 sysfs_attr_init(&temp_attr->attr);
1360 error = sysfs_create_file(&mod->mkobj.kobj,&temp_attr->attr);
1367 static void module_remove_modinfo_attrs(struct module *mod)
1369 struct module_attribute *attr;
1372 for (i = 0; (attr = &mod->modinfo_attrs[i]); i++) {
1373 /* pick a field to test for end of list */
1374 if (!attr->attr.name)
1376 sysfs_remove_file(&mod->mkobj.kobj,&attr->attr);
1380 kfree(mod->modinfo_attrs);
1383 static int mod_sysfs_init(struct module *mod)
1386 struct kobject *kobj;
1388 if (!module_sysfs_initialized) {
1389 printk(KERN_ERR "%s: module sysfs not initialized\n",
1395 kobj = kset_find_obj(module_kset, mod->name);
1397 printk(KERN_ERR "%s: module is already loaded\n", mod->name);
1403 mod->mkobj.mod = mod;
1405 memset(&mod->mkobj.kobj, 0, sizeof(mod->mkobj.kobj));
1406 mod->mkobj.kobj.kset = module_kset;
1407 err = kobject_init_and_add(&mod->mkobj.kobj, &module_ktype, NULL,
1410 kobject_put(&mod->mkobj.kobj);
1412 /* delay uevent until full sysfs population */
1417 static int mod_sysfs_setup(struct module *mod,
1418 struct kernel_param *kparam,
1419 unsigned int num_params)
1423 err = mod_sysfs_init(mod);
1427 mod->holders_dir = kobject_create_and_add("holders", &mod->mkobj.kobj);
1428 if (!mod->holders_dir) {
1433 err = module_param_sysfs_setup(mod, kparam, num_params);
1435 goto out_unreg_holders;
1437 err = module_add_modinfo_attrs(mod);
1439 goto out_unreg_param;
1441 add_usage_links(mod);
1443 kobject_uevent(&mod->mkobj.kobj, KOBJ_ADD);
1447 module_param_sysfs_remove(mod);
1449 kobject_put(mod->holders_dir);
1451 kobject_put(&mod->mkobj.kobj);
1456 static void mod_sysfs_fini(struct module *mod)
1458 kobject_put(&mod->mkobj.kobj);
1461 #else /* CONFIG_SYSFS */
1463 static inline int mod_sysfs_init(struct module *mod)
1468 static inline int mod_sysfs_setup(struct module *mod,
1469 struct kernel_param *kparam,
1470 unsigned int num_params)
1475 static inline int module_add_modinfo_attrs(struct module *mod)
1480 static inline void module_remove_modinfo_attrs(struct module *mod)
1484 static void mod_sysfs_fini(struct module *mod)
1488 static void del_usage_links(struct module *mod)
1492 #endif /* CONFIG_SYSFS */
1494 static void mod_kobject_remove(struct module *mod)
1496 del_usage_links(mod);
1497 module_remove_modinfo_attrs(mod);
1498 module_param_sysfs_remove(mod);
1499 kobject_put(mod->mkobj.drivers_dir);
1500 kobject_put(mod->holders_dir);
1501 mod_sysfs_fini(mod);
1505 * unlink the module with the whole machine is stopped with interrupts off
1506 * - this defends against kallsyms not taking locks
1508 static int __unlink_module(void *_mod)
1510 struct module *mod = _mod;
1511 list_del(&mod->list);
1515 /* Free a module, remove from lists, etc. */
1516 static void free_module(struct module *mod)
1518 trace_module_free(mod);
1520 /* Delete from various lists */
1521 mutex_lock(&module_mutex);
1522 stop_machine(__unlink_module, mod, NULL);
1523 mutex_unlock(&module_mutex);
1524 remove_notes_attrs(mod);
1525 remove_sect_attrs(mod);
1526 mod_kobject_remove(mod);
1528 /* Arch-specific cleanup. */
1529 module_arch_cleanup(mod);
1531 /* Module unload stuff */
1532 module_unload_free(mod);
1534 /* Free any allocated parameters. */
1535 destroy_params(mod->kp, mod->num_kp);
1537 /* This may be NULL, but that's OK */
1538 module_free(mod, mod->module_init);
1540 percpu_modfree(mod);
1541 #if defined(CONFIG_MODULE_UNLOAD)
1543 free_percpu(mod->refptr);
1545 /* Free lock-classes: */
1546 lockdep_free_key_range(mod->module_core, mod->core_size);
1548 /* Finally, free the core (containing the module structure) */
1549 module_free(mod, mod->module_core);
1552 update_protections(current->mm);
1556 void *__symbol_get(const char *symbol)
1558 struct module *owner;
1559 const struct kernel_symbol *sym;
1562 sym = find_symbol(symbol, &owner, NULL, true, true);
1563 if (sym && strong_try_module_get(owner))
1567 return sym ? (void *)sym->value : NULL;
1569 EXPORT_SYMBOL_GPL(__symbol_get);
1572 * Ensure that an exported symbol [global namespace] does not already exist
1573 * in the kernel or in some other module's exported symbol table.
1575 static int verify_export_symbols(struct module *mod)
1578 struct module *owner;
1579 const struct kernel_symbol *s;
1581 const struct kernel_symbol *sym;
1584 { mod->syms, mod->num_syms },
1585 { mod->gpl_syms, mod->num_gpl_syms },
1586 { mod->gpl_future_syms, mod->num_gpl_future_syms },
1587 #ifdef CONFIG_UNUSED_SYMBOLS
1588 { mod->unused_syms, mod->num_unused_syms },
1589 { mod->unused_gpl_syms, mod->num_unused_gpl_syms },
1593 for (i = 0; i < ARRAY_SIZE(arr); i++) {
1594 for (s = arr[i].sym; s < arr[i].sym + arr[i].num; s++) {
1595 const struct kernel_symbol *sym;
1597 /* Stopping preemption makes find_symbol safe. */
1599 sym = find_symbol(s->name, &owner, NULL, true, false);
1604 "%s: exports duplicate symbol %s"
1606 mod->name, s->name, module_name(owner));
1614 /* Change all symbols so that st_value encodes the pointer directly. */
1615 static int simplify_symbols(Elf_Shdr *sechdrs,
1616 unsigned int symindex,
1618 unsigned int versindex,
1619 unsigned int pcpuindex,
1622 Elf_Sym *sym = (void *)sechdrs[symindex].sh_addr;
1623 unsigned long secbase;
1624 unsigned int i, n = sechdrs[symindex].sh_size / sizeof(Elf_Sym);
1626 const struct kernel_symbol *ksym;
1628 for (i = 1; i < n; i++) {
1629 switch (sym[i].st_shndx) {
1631 /* We compiled with -fno-common. These are not
1632 supposed to happen. */
1633 DEBUGP("Common symbol: %s\n", strtab + sym[i].st_name);
1634 printk("%s: please compile with -fno-common\n",
1640 /* Don't need to do anything */
1641 DEBUGP("Absolute symbol: 0x%08lx\n",
1642 (long)sym[i].st_value);
1646 ksym = resolve_symbol(sechdrs, versindex,
1647 strtab + sym[i].st_name, mod);
1648 /* Ok if resolved. */
1650 sym[i].st_value = ksym->value;
1655 if (ELF_ST_BIND(sym[i].st_info) == STB_WEAK)
1658 printk(KERN_WARNING "%s: Unknown symbol %s\n",
1659 mod->name, strtab + sym[i].st_name);
1664 /* Divert to percpu allocation if a percpu var. */
1665 if (sym[i].st_shndx == pcpuindex)
1666 secbase = (unsigned long)mod_percpu(mod);
1668 secbase = sechdrs[sym[i].st_shndx].sh_addr;
1669 sym[i].st_value += secbase;
1677 /* Additional bytes needed by arch in front of individual sections */
1678 unsigned int __weak arch_mod_section_prepend(struct module *mod,
1679 unsigned int section)
1681 /* default implementation just returns zero */
1685 /* Update size with this section: return offset. */
1686 static long get_offset(struct module *mod, unsigned int *size,
1687 Elf_Shdr *sechdr, unsigned int section)
1691 *size += arch_mod_section_prepend(mod, section);
1692 ret = ALIGN(*size, sechdr->sh_addralign ?: 1);
1693 *size = ret + sechdr->sh_size;
1697 /* Lay out the SHF_ALLOC sections in a way not dissimilar to how ld
1698 might -- code, read-only data, read-write data, small data. Tally
1699 sizes, and place the offsets into sh_entsize fields: high bit means it
1701 static void layout_sections(struct module *mod,
1702 const Elf_Ehdr *hdr,
1704 const char *secstrings)
1706 static unsigned long const masks[][2] = {
1707 /* NOTE: all executable code must be the first section
1708 * in this array; otherwise modify the text_size
1709 * finder in the two loops below */
1710 { SHF_EXECINSTR | SHF_ALLOC, ARCH_SHF_SMALL },
1711 { SHF_ALLOC, SHF_WRITE | ARCH_SHF_SMALL },
1712 { SHF_WRITE | SHF_ALLOC, ARCH_SHF_SMALL },
1713 { ARCH_SHF_SMALL | SHF_ALLOC, 0 }
1717 for (i = 0; i < hdr->e_shnum; i++)
1718 sechdrs[i].sh_entsize = ~0UL;
1720 DEBUGP("Core section allocation order:\n");
1721 for (m = 0; m < ARRAY_SIZE(masks); ++m) {
1722 for (i = 0; i < hdr->e_shnum; ++i) {
1723 Elf_Shdr *s = &sechdrs[i];
1725 if ((s->sh_flags & masks[m][0]) != masks[m][0]
1726 || (s->sh_flags & masks[m][1])
1727 || s->sh_entsize != ~0UL
1728 || strstarts(secstrings + s->sh_name, ".init"))
1730 s->sh_entsize = get_offset(mod, &mod->core_size, s, i);
1731 DEBUGP("\t%s\n", secstrings + s->sh_name);
1734 mod->core_text_size = mod->core_size;
1737 DEBUGP("Init section allocation order:\n");
1738 for (m = 0; m < ARRAY_SIZE(masks); ++m) {
1739 for (i = 0; i < hdr->e_shnum; ++i) {
1740 Elf_Shdr *s = &sechdrs[i];
1742 if ((s->sh_flags & masks[m][0]) != masks[m][0]
1743 || (s->sh_flags & masks[m][1])
1744 || s->sh_entsize != ~0UL
1745 || !strstarts(secstrings + s->sh_name, ".init"))
1747 s->sh_entsize = (get_offset(mod, &mod->init_size, s, i)
1748 | INIT_OFFSET_MASK);
1749 DEBUGP("\t%s\n", secstrings + s->sh_name);
1752 mod->init_text_size = mod->init_size;
1756 static void set_license(struct module *mod, const char *license)
1759 license = "unspecified";
1761 if (!license_is_gpl_compatible(license)) {
1762 if (!test_taint(TAINT_PROPRIETARY_MODULE))
1763 printk(KERN_WARNING "%s: module license '%s' taints "
1764 "kernel.\n", mod->name, license);
1765 add_taint_module(mod, TAINT_PROPRIETARY_MODULE);
1769 /* Parse tag=value strings from .modinfo section */
1770 static char *next_string(char *string, unsigned long *secsize)
1772 /* Skip non-zero chars */
1775 if ((*secsize)-- <= 1)
1779 /* Skip any zero padding. */
1780 while (!string[0]) {
1782 if ((*secsize)-- <= 1)
1788 static char *get_modinfo(Elf_Shdr *sechdrs,
1793 unsigned int taglen = strlen(tag);
1794 unsigned long size = sechdrs[info].sh_size;
1796 for (p = (char *)sechdrs[info].sh_addr; p; p = next_string(p, &size)) {
1797 if (strncmp(p, tag, taglen) == 0 && p[taglen] == '=')
1798 return p + taglen + 1;
1803 static void setup_modinfo(struct module *mod, Elf_Shdr *sechdrs,
1804 unsigned int infoindex)
1806 struct module_attribute *attr;
1809 for (i = 0; (attr = modinfo_attrs[i]); i++) {
1812 get_modinfo(sechdrs,
1818 static void free_modinfo(struct module *mod)
1820 struct module_attribute *attr;
1823 for (i = 0; (attr = modinfo_attrs[i]); i++) {
1829 #ifdef CONFIG_KALLSYMS
1831 /* lookup symbol in given range of kernel_symbols */
1832 static const struct kernel_symbol *lookup_symbol(const char *name,
1833 const struct kernel_symbol *start,
1834 const struct kernel_symbol *stop)
1836 const struct kernel_symbol *ks = start;
1837 for (; ks < stop; ks++)
1838 if (strcmp(ks->name, name) == 0)
1843 static int is_exported(const char *name, unsigned long value,
1844 const struct module *mod)
1846 const struct kernel_symbol *ks;
1848 ks = lookup_symbol(name, __start___ksymtab, __stop___ksymtab);
1850 ks = lookup_symbol(name, mod->syms, mod->syms + mod->num_syms);
1851 return ks != NULL && ks->value == value;
1855 static char elf_type(const Elf_Sym *sym,
1857 const char *secstrings,
1860 if (ELF_ST_BIND(sym->st_info) == STB_WEAK) {
1861 if (ELF_ST_TYPE(sym->st_info) == STT_OBJECT)
1866 if (sym->st_shndx == SHN_UNDEF)
1868 if (sym->st_shndx == SHN_ABS)
1870 if (sym->st_shndx >= SHN_LORESERVE)
1872 if (sechdrs[sym->st_shndx].sh_flags & SHF_EXECINSTR)
1874 if (sechdrs[sym->st_shndx].sh_flags & SHF_ALLOC
1875 && sechdrs[sym->st_shndx].sh_type != SHT_NOBITS) {
1876 if (!(sechdrs[sym->st_shndx].sh_flags & SHF_WRITE))
1878 else if (sechdrs[sym->st_shndx].sh_flags & ARCH_SHF_SMALL)
1883 if (sechdrs[sym->st_shndx].sh_type == SHT_NOBITS) {
1884 if (sechdrs[sym->st_shndx].sh_flags & ARCH_SHF_SMALL)
1889 if (strstarts(secstrings + sechdrs[sym->st_shndx].sh_name, ".debug"))
1894 static bool is_core_symbol(const Elf_Sym *src, const Elf_Shdr *sechdrs,
1897 const Elf_Shdr *sec;
1899 if (src->st_shndx == SHN_UNDEF
1900 || src->st_shndx >= shnum
1904 sec = sechdrs + src->st_shndx;
1905 if (!(sec->sh_flags & SHF_ALLOC)
1906 #ifndef CONFIG_KALLSYMS_ALL
1907 || !(sec->sh_flags & SHF_EXECINSTR)
1909 || (sec->sh_entsize & INIT_OFFSET_MASK))
1915 static unsigned long layout_symtab(struct module *mod,
1917 unsigned int symindex,
1918 unsigned int strindex,
1919 const Elf_Ehdr *hdr,
1920 const char *secstrings,
1921 unsigned long *pstroffs,
1922 unsigned long *strmap)
1924 unsigned long symoffs;
1925 Elf_Shdr *symsect = sechdrs + symindex;
1926 Elf_Shdr *strsect = sechdrs + strindex;
1929 unsigned int i, nsrc, ndst;
1931 /* Put symbol section at end of init part of module. */
1932 symsect->sh_flags |= SHF_ALLOC;
1933 symsect->sh_entsize = get_offset(mod, &mod->init_size, symsect,
1934 symindex) | INIT_OFFSET_MASK;
1935 DEBUGP("\t%s\n", secstrings + symsect->sh_name);
1937 src = (void *)hdr + symsect->sh_offset;
1938 nsrc = symsect->sh_size / sizeof(*src);
1939 strtab = (void *)hdr + strsect->sh_offset;
1940 for (ndst = i = 1; i < nsrc; ++i, ++src)
1941 if (is_core_symbol(src, sechdrs, hdr->e_shnum)) {
1942 unsigned int j = src->st_name;
1944 while(!__test_and_set_bit(j, strmap) && strtab[j])
1949 /* Append room for core symbols at end of core part. */
1950 symoffs = ALIGN(mod->core_size, symsect->sh_addralign ?: 1);
1951 mod->core_size = symoffs + ndst * sizeof(Elf_Sym);
1953 /* Put string table section at end of init part of module. */
1954 strsect->sh_flags |= SHF_ALLOC;
1955 strsect->sh_entsize = get_offset(mod, &mod->init_size, strsect,
1956 strindex) | INIT_OFFSET_MASK;
1957 DEBUGP("\t%s\n", secstrings + strsect->sh_name);
1959 /* Append room for core symbols' strings at end of core part. */
1960 *pstroffs = mod->core_size;
1961 __set_bit(0, strmap);
1962 mod->core_size += bitmap_weight(strmap, strsect->sh_size);
1967 static void add_kallsyms(struct module *mod,
1970 unsigned int symindex,
1971 unsigned int strindex,
1972 unsigned long symoffs,
1973 unsigned long stroffs,
1974 const char *secstrings,
1975 unsigned long *strmap)
1977 unsigned int i, ndst;
1982 mod->symtab = (void *)sechdrs[symindex].sh_addr;
1983 mod->num_symtab = sechdrs[symindex].sh_size / sizeof(Elf_Sym);
1984 mod->strtab = (void *)sechdrs[strindex].sh_addr;
1986 /* Set types up while we still have access to sections. */
1987 for (i = 0; i < mod->num_symtab; i++)
1988 mod->symtab[i].st_info
1989 = elf_type(&mod->symtab[i], sechdrs, secstrings, mod);
1991 mod->core_symtab = dst = mod->module_core + symoffs;
1994 for (ndst = i = 1; i < mod->num_symtab; ++i, ++src) {
1995 if (!is_core_symbol(src, sechdrs, shnum))
1998 dst[ndst].st_name = bitmap_weight(strmap, dst[ndst].st_name);
2001 mod->core_num_syms = ndst;
2003 mod->core_strtab = s = mod->module_core + stroffs;
2004 for (*s = 0, i = 1; i < sechdrs[strindex].sh_size; ++i)
2005 if (test_bit(i, strmap))
2006 *++s = mod->strtab[i];
2009 static inline unsigned long layout_symtab(struct module *mod,
2011 unsigned int symindex,
2012 unsigned int strindex,
2013 const Elf_Ehdr *hdr,
2014 const char *secstrings,
2015 unsigned long *pstroffs,
2016 unsigned long *strmap)
2021 static inline void add_kallsyms(struct module *mod,
2024 unsigned int symindex,
2025 unsigned int strindex,
2026 unsigned long symoffs,
2027 unsigned long stroffs,
2028 const char *secstrings,
2029 const unsigned long *strmap)
2032 #endif /* CONFIG_KALLSYMS */
2034 static void dynamic_debug_setup(struct _ddebug *debug, unsigned int num)
2036 #ifdef CONFIG_DYNAMIC_DEBUG
2037 if (ddebug_add_module(debug, num, debug->modname))
2038 printk(KERN_ERR "dynamic debug error adding module: %s\n",
2043 static void *module_alloc_update_bounds(unsigned long size)
2045 void *ret = module_alloc(size);
2048 mutex_lock(&module_mutex);
2049 /* Update module bounds. */
2050 if ((unsigned long)ret < module_addr_min)
2051 module_addr_min = (unsigned long)ret;
2052 if ((unsigned long)ret + size > module_addr_max)
2053 module_addr_max = (unsigned long)ret + size;
2054 mutex_unlock(&module_mutex);
2059 #ifdef CONFIG_DEBUG_KMEMLEAK
2060 static void kmemleak_load_module(struct module *mod, Elf_Ehdr *hdr,
2061 Elf_Shdr *sechdrs, char *secstrings)
2065 /* only scan the sections containing data */
2066 kmemleak_scan_area(mod, sizeof(struct module), GFP_KERNEL);
2068 for (i = 1; i < hdr->e_shnum; i++) {
2069 if (!(sechdrs[i].sh_flags & SHF_ALLOC))
2071 if (strncmp(secstrings + sechdrs[i].sh_name, ".data", 5) != 0
2072 && strncmp(secstrings + sechdrs[i].sh_name, ".bss", 4) != 0)
2075 kmemleak_scan_area((void *)sechdrs[i].sh_addr,
2076 sechdrs[i].sh_size, GFP_KERNEL);
2080 static inline void kmemleak_load_module(struct module *mod, Elf_Ehdr *hdr,
2081 Elf_Shdr *sechdrs, char *secstrings)
2086 /* Allocate and load the module: note that size of section 0 is always
2087 zero, and we rely on this for optional sections. */
2088 static noinline struct module *load_module(void __user *umod,
2090 const char __user *uargs)
2094 char *secstrings, *args, *modmagic, *strtab = NULL;
2097 unsigned int symindex = 0;
2098 unsigned int strindex = 0;
2099 unsigned int modindex, versindex, infoindex, pcpuindex;
2102 void *ptr = NULL; /* Stops spurious gcc warning */
2103 unsigned long symoffs, stroffs, *strmap;
2104 void __percpu *percpu;
2106 mm_segment_t old_fs;
2108 DEBUGP("load_module: umod=%p, len=%lu, uargs=%p\n",
2110 if (len < sizeof(*hdr))
2111 return ERR_PTR(-ENOEXEC);
2113 /* Suck in entire file: we'll want most of it. */
2114 /* vmalloc barfs on "unusual" numbers. Check here */
2115 if (len > 64 * 1024 * 1024 || (hdr = vmalloc(len)) == NULL)
2116 return ERR_PTR(-ENOMEM);
2118 if (copy_from_user(hdr, umod, len) != 0) {
2123 /* Sanity checks against insmoding binaries or wrong arch,
2124 weird elf version */
2125 if (memcmp(hdr->e_ident, ELFMAG, SELFMAG) != 0
2126 || hdr->e_type != ET_REL
2127 || !elf_check_arch(hdr)
2128 || hdr->e_shentsize != sizeof(*sechdrs)) {
2133 if (len < hdr->e_shoff + hdr->e_shnum * sizeof(Elf_Shdr))
2136 /* Convenience variables */
2137 sechdrs = (void *)hdr + hdr->e_shoff;
2138 secstrings = (void *)hdr + sechdrs[hdr->e_shstrndx].sh_offset;
2139 sechdrs[0].sh_addr = 0;
2141 for (i = 1; i < hdr->e_shnum; i++) {
2142 if (sechdrs[i].sh_type != SHT_NOBITS
2143 && len < sechdrs[i].sh_offset + sechdrs[i].sh_size)
2146 /* Mark all sections sh_addr with their address in the
2148 sechdrs[i].sh_addr = (size_t)hdr + sechdrs[i].sh_offset;
2150 /* Internal symbols and strings. */
2151 if (sechdrs[i].sh_type == SHT_SYMTAB) {
2153 strindex = sechdrs[i].sh_link;
2154 strtab = (char *)hdr + sechdrs[strindex].sh_offset;
2156 #ifndef CONFIG_MODULE_UNLOAD
2157 /* Don't load .exit sections */
2158 if (strstarts(secstrings+sechdrs[i].sh_name, ".exit"))
2159 sechdrs[i].sh_flags &= ~(unsigned long)SHF_ALLOC;
2163 modindex = find_sec(hdr, sechdrs, secstrings,
2164 ".gnu.linkonce.this_module");
2166 printk(KERN_WARNING "No module found in object\n");
2170 /* This is temporary: point mod into copy of data. */
2171 mod = (void *)sechdrs[modindex].sh_addr;
2173 if (symindex == 0) {
2174 printk(KERN_WARNING "%s: module has no symbols (stripped?)\n",
2180 versindex = find_sec(hdr, sechdrs, secstrings, "__versions");
2181 infoindex = find_sec(hdr, sechdrs, secstrings, ".modinfo");
2182 pcpuindex = find_pcpusec(hdr, sechdrs, secstrings);
2184 /* Don't keep modinfo and version sections. */
2185 sechdrs[infoindex].sh_flags &= ~(unsigned long)SHF_ALLOC;
2186 sechdrs[versindex].sh_flags &= ~(unsigned long)SHF_ALLOC;
2188 /* Check module struct version now, before we try to use module. */
2189 if (!check_modstruct_version(sechdrs, versindex, mod)) {
2194 modmagic = get_modinfo(sechdrs, infoindex, "vermagic");
2195 /* This is allowed: modprobe --force will invalidate it. */
2197 err = try_to_force_load(mod, "bad vermagic");
2200 } else if (!same_magic(modmagic, vermagic, versindex)) {
2201 printk(KERN_ERR "%s: version magic '%s' should be '%s'\n",
2202 mod->name, modmagic, vermagic);
2207 staging = get_modinfo(sechdrs, infoindex, "staging");
2209 add_taint_module(mod, TAINT_CRAP);
2210 printk(KERN_WARNING "%s: module is from the staging directory,"
2211 " the quality is unknown, you have been warned.\n",
2215 /* Now copy in args */
2216 args = strndup_user(uargs, ~0UL >> 1);
2218 err = PTR_ERR(args);
2222 strmap = kzalloc(BITS_TO_LONGS(sechdrs[strindex].sh_size)
2223 * sizeof(long), GFP_KERNEL);
2229 mod->state = MODULE_STATE_COMING;
2231 /* Allow arches to frob section contents and sizes. */
2232 err = module_frob_arch_sections(hdr, sechdrs, secstrings, mod);
2237 /* We have a special allocation for this section. */
2238 err = percpu_modalloc(mod, sechdrs[pcpuindex].sh_size,
2239 sechdrs[pcpuindex].sh_addralign);
2242 sechdrs[pcpuindex].sh_flags &= ~(unsigned long)SHF_ALLOC;
2244 /* Keep this around for failure path. */
2245 percpu = mod_percpu(mod);
2247 /* Determine total sizes, and put offsets in sh_entsize. For now
2248 this is done generically; there doesn't appear to be any
2249 special cases for the architectures. */
2250 layout_sections(mod, hdr, sechdrs, secstrings);
2251 symoffs = layout_symtab(mod, sechdrs, symindex, strindex, hdr,
2252 secstrings, &stroffs, strmap);
2254 /* Do the allocs. */
2255 ptr = module_alloc_update_bounds(mod->core_size);
2257 * The pointer to this block is stored in the module structure
2258 * which is inside the block. Just mark it as not being a
2261 kmemleak_not_leak(ptr);
2266 memset(ptr, 0, mod->core_size);
2267 mod->module_core = ptr;
2269 ptr = module_alloc_update_bounds(mod->init_size);
2271 * The pointer to this block is stored in the module structure
2272 * which is inside the block. This block doesn't need to be
2273 * scanned as it contains data and code that will be freed
2274 * after the module is initialized.
2276 kmemleak_ignore(ptr);
2277 if (!ptr && mod->init_size) {
2281 memset(ptr, 0, mod->init_size);
2282 mod->module_init = ptr;
2284 /* Transfer each section which specifies SHF_ALLOC */
2285 DEBUGP("final section addresses:\n");
2286 for (i = 0; i < hdr->e_shnum; i++) {
2289 if (!(sechdrs[i].sh_flags & SHF_ALLOC))
2292 if (sechdrs[i].sh_entsize & INIT_OFFSET_MASK)
2293 dest = mod->module_init
2294 + (sechdrs[i].sh_entsize & ~INIT_OFFSET_MASK);
2296 dest = mod->module_core + sechdrs[i].sh_entsize;
2298 if (sechdrs[i].sh_type != SHT_NOBITS)
2299 memcpy(dest, (void *)sechdrs[i].sh_addr,
2300 sechdrs[i].sh_size);
2301 /* Update sh_addr to point to copy in image. */
2302 sechdrs[i].sh_addr = (unsigned long)dest;
2303 DEBUGP("\t0x%lx %s\n", sechdrs[i].sh_addr, secstrings + sechdrs[i].sh_name);
2305 /* Module has been moved. */
2306 mod = (void *)sechdrs[modindex].sh_addr;
2307 kmemleak_load_module(mod, hdr, sechdrs, secstrings);
2309 #if defined(CONFIG_MODULE_UNLOAD)
2310 mod->refptr = alloc_percpu(struct module_ref);
2316 /* Now we've moved module, initialize linked lists, etc. */
2317 module_unload_init(mod);
2319 /* Set up license info based on the info section */
2320 set_license(mod, get_modinfo(sechdrs, infoindex, "license"));
2323 * ndiswrapper is under GPL by itself, but loads proprietary modules.
2324 * Don't use add_taint_module(), as it would prevent ndiswrapper from
2325 * using GPL-only symbols it needs.
2327 if (strcmp(mod->name, "ndiswrapper") == 0)
2328 add_taint(TAINT_PROPRIETARY_MODULE);
2330 /* driverloader was caught wrongly pretending to be under GPL */
2331 if (strcmp(mod->name, "driverloader") == 0)
2332 add_taint_module(mod, TAINT_PROPRIETARY_MODULE);
2334 /* Set up MODINFO_ATTR fields */
2335 setup_modinfo(mod, sechdrs, infoindex);
2337 /* Fix up syms, so that st_value is a pointer to location. */
2338 err = simplify_symbols(sechdrs, symindex, strtab, versindex, pcpuindex,
2343 /* Now we've got everything in the final locations, we can
2344 * find optional sections. */
2345 mod->kp = section_objs(hdr, sechdrs, secstrings, "__param",
2346 sizeof(*mod->kp), &mod->num_kp);
2347 mod->syms = section_objs(hdr, sechdrs, secstrings, "__ksymtab",
2348 sizeof(*mod->syms), &mod->num_syms);
2349 mod->crcs = section_addr(hdr, sechdrs, secstrings, "__kcrctab");
2350 mod->gpl_syms = section_objs(hdr, sechdrs, secstrings, "__ksymtab_gpl",
2351 sizeof(*mod->gpl_syms),
2352 &mod->num_gpl_syms);
2353 mod->gpl_crcs = section_addr(hdr, sechdrs, secstrings, "__kcrctab_gpl");
2354 mod->gpl_future_syms = section_objs(hdr, sechdrs, secstrings,
2355 "__ksymtab_gpl_future",
2356 sizeof(*mod->gpl_future_syms),
2357 &mod->num_gpl_future_syms);
2358 mod->gpl_future_crcs = section_addr(hdr, sechdrs, secstrings,
2359 "__kcrctab_gpl_future");
2361 #ifdef CONFIG_UNUSED_SYMBOLS
2362 mod->unused_syms = section_objs(hdr, sechdrs, secstrings,
2364 sizeof(*mod->unused_syms),
2365 &mod->num_unused_syms);
2366 mod->unused_crcs = section_addr(hdr, sechdrs, secstrings,
2367 "__kcrctab_unused");
2368 mod->unused_gpl_syms = section_objs(hdr, sechdrs, secstrings,
2369 "__ksymtab_unused_gpl",
2370 sizeof(*mod->unused_gpl_syms),
2371 &mod->num_unused_gpl_syms);
2372 mod->unused_gpl_crcs = section_addr(hdr, sechdrs, secstrings,
2373 "__kcrctab_unused_gpl");
2375 #ifdef CONFIG_CONSTRUCTORS
2376 mod->ctors = section_objs(hdr, sechdrs, secstrings, ".ctors",
2377 sizeof(*mod->ctors), &mod->num_ctors);
2380 #ifdef CONFIG_TRACEPOINTS
2381 mod->tracepoints = section_objs(hdr, sechdrs, secstrings,
2383 sizeof(*mod->tracepoints),
2384 &mod->num_tracepoints);
2386 #ifdef CONFIG_EVENT_TRACING
2387 mod->trace_events = section_objs(hdr, sechdrs, secstrings,
2389 sizeof(*mod->trace_events),
2390 &mod->num_trace_events);
2392 * This section contains pointers to allocated objects in the trace
2393 * code and not scanning it leads to false positives.
2395 kmemleak_scan_area(mod->trace_events, sizeof(*mod->trace_events) *
2396 mod->num_trace_events, GFP_KERNEL);
2398 #ifdef CONFIG_FTRACE_MCOUNT_RECORD
2399 /* sechdrs[0].sh_size is always zero */
2400 mod->ftrace_callsites = section_objs(hdr, sechdrs, secstrings,
2402 sizeof(*mod->ftrace_callsites),
2403 &mod->num_ftrace_callsites);
2405 #ifdef CONFIG_MODVERSIONS
2406 if ((mod->num_syms && !mod->crcs)
2407 || (mod->num_gpl_syms && !mod->gpl_crcs)
2408 || (mod->num_gpl_future_syms && !mod->gpl_future_crcs)
2409 #ifdef CONFIG_UNUSED_SYMBOLS
2410 || (mod->num_unused_syms && !mod->unused_crcs)
2411 || (mod->num_unused_gpl_syms && !mod->unused_gpl_crcs)
2414 err = try_to_force_load(mod,
2415 "no versions for exported symbols");
2421 /* Now do relocations. */
2422 for (i = 1; i < hdr->e_shnum; i++) {
2423 const char *strtab = (char *)sechdrs[strindex].sh_addr;
2424 unsigned int info = sechdrs[i].sh_info;
2426 /* Not a valid relocation section? */
2427 if (info >= hdr->e_shnum)
2430 /* Don't bother with non-allocated sections */
2431 if (!(sechdrs[info].sh_flags & SHF_ALLOC))
2434 if (sechdrs[i].sh_type == SHT_REL)
2435 err = apply_relocate(sechdrs, strtab, symindex, i,mod);
2436 else if (sechdrs[i].sh_type == SHT_RELA)
2437 err = apply_relocate_add(sechdrs, strtab, symindex, i,
2443 /* Find duplicate symbols */
2444 err = verify_export_symbols(mod);
2448 /* Set up and sort exception table */
2449 mod->extable = section_objs(hdr, sechdrs, secstrings, "__ex_table",
2450 sizeof(*mod->extable), &mod->num_exentries);
2451 sort_extable(mod->extable, mod->extable + mod->num_exentries);
2453 /* Finally, copy percpu area over. */
2454 percpu_modcopy(mod, (void *)sechdrs[pcpuindex].sh_addr,
2455 sechdrs[pcpuindex].sh_size);
2457 add_kallsyms(mod, sechdrs, hdr->e_shnum, symindex, strindex,
2458 symoffs, stroffs, secstrings, strmap);
2463 struct _ddebug *debug;
2464 unsigned int num_debug;
2466 debug = section_objs(hdr, sechdrs, secstrings, "__verbose",
2467 sizeof(*debug), &num_debug);
2469 dynamic_debug_setup(debug, num_debug);
2472 err = module_finalize(hdr, sechdrs, mod);
2476 /* flush the icache in correct context */
2481 * Flush the instruction cache, since we've played with text.
2482 * Do it before processing of module parameters, so the module
2483 * can provide parameter accessor functions of its own.
2485 if (mod->module_init)
2486 flush_icache_range((unsigned long)mod->module_init,
2487 (unsigned long)mod->module_init
2489 flush_icache_range((unsigned long)mod->module_core,
2490 (unsigned long)mod->module_core + mod->core_size);
2495 if (section_addr(hdr, sechdrs, secstrings, "__obsparm"))
2496 printk(KERN_WARNING "%s: Ignoring obsolete parameters\n",
2499 /* Now sew it into the lists so we can get lockdep and oops
2500 * info during argument parsing. Noone should access us, since
2501 * strong_try_module_get() will fail.
2502 * lockdep/oops can run asynchronous, so use the RCU list insertion
2503 * function to insert in a way safe to concurrent readers.
2504 * The mutex protects against concurrent writers.
2506 mutex_lock(&module_mutex);
2507 if (find_module(mod->name)) {
2509 /* This will also unlock the mutex */
2510 goto already_exists;
2513 list_add_rcu(&mod->list, &modules);
2514 mutex_unlock(&module_mutex);
2516 err = parse_args(mod->name, mod->args, mod->kp, mod->num_kp, NULL);
2520 err = mod_sysfs_setup(mod, mod->kp, mod->num_kp);
2524 add_sect_attrs(mod, hdr->e_shnum, secstrings, sechdrs);
2525 add_notes_attrs(mod, hdr->e_shnum, secstrings, sechdrs);
2527 /* Get rid of temporary copy */
2530 trace_module_load(mod);
2536 mutex_lock(&module_mutex);
2537 /* Unlink carefully: kallsyms could be walking list. */
2538 list_del_rcu(&mod->list);
2540 mutex_unlock(&module_mutex);
2541 synchronize_sched();
2542 module_arch_cleanup(mod);
2545 module_unload_free(mod);
2546 #if defined(CONFIG_MODULE_UNLOAD)
2547 free_percpu(mod->refptr);
2550 module_free(mod, mod->module_init);
2552 module_free(mod, mod->module_core);
2553 /* mod will be freed with core. Don't access it beyond this line! */
2555 free_percpu(percpu);
2561 return ERR_PTR(err);
2564 printk(KERN_ERR "Module len %lu truncated\n", len);
2569 /* Call module constructors. */
2570 static void do_mod_ctors(struct module *mod)
2572 #ifdef CONFIG_CONSTRUCTORS
2575 for (i = 0; i < mod->num_ctors; i++)
2580 /* This is where the real work happens */
2581 SYSCALL_DEFINE3(init_module, void __user *, umod,
2582 unsigned long, len, const char __user *, uargs)
2587 /* Must have permission */
2588 if (!capable(CAP_SYS_MODULE) || modules_disabled)
2591 /* Do all the hard work */
2592 mod = load_module(umod, len, uargs);
2594 return PTR_ERR(mod);
2596 blocking_notifier_call_chain(&module_notify_list,
2597 MODULE_STATE_COMING, mod);
2600 /* Start the module */
2601 if (mod->init != NULL)
2602 ret = do_one_initcall(mod->init);
2604 /* Init routine failed: abort. Try to protect us from
2605 buggy refcounters. */
2606 mod->state = MODULE_STATE_GOING;
2607 synchronize_sched();
2609 blocking_notifier_call_chain(&module_notify_list,
2610 MODULE_STATE_GOING, mod);
2612 wake_up(&module_wq);
2617 "%s: '%s'->init suspiciously returned %d, it should follow 0/-E convention\n"
2618 "%s: loading module anyway...\n",
2619 __func__, mod->name, ret,
2624 /* Now it's a first class citizen! Wake up anyone waiting for it. */
2625 mod->state = MODULE_STATE_LIVE;
2626 wake_up(&module_wq);
2627 blocking_notifier_call_chain(&module_notify_list,
2628 MODULE_STATE_LIVE, mod);
2630 /* We need to finish all async code before the module init sequence is done */
2631 async_synchronize_full();
2633 mutex_lock(&module_mutex);
2634 /* Drop initial reference. */
2636 trim_init_extable(mod);
2637 #ifdef CONFIG_KALLSYMS
2638 mod->num_symtab = mod->core_num_syms;
2639 mod->symtab = mod->core_symtab;
2640 mod->strtab = mod->core_strtab;
2642 module_free(mod, mod->module_init);
2643 mod->module_init = NULL;
2645 mod->init_text_size = 0;
2646 mutex_unlock(&module_mutex);
2651 static inline int within(unsigned long addr, void *start, unsigned long size)
2653 return ((void *)addr >= start && (void *)addr < start + size);
2656 #ifdef CONFIG_KALLSYMS
2658 * This ignores the intensely annoying "mapping symbols" found
2659 * in ARM ELF files: $a, $t and $d.
2661 static inline int is_arm_mapping_symbol(const char *str)
2663 return str[0] == '$' && strchr("atd", str[1])
2664 && (str[2] == '\0' || str[2] == '.');
2667 static const char *get_ksymbol(struct module *mod,
2669 unsigned long *size,
2670 unsigned long *offset)
2672 unsigned int i, best = 0;
2673 unsigned long nextval;
2675 /* At worse, next value is at end of module */
2676 if (within_module_init(addr, mod))
2677 nextval = (unsigned long)mod->module_init+mod->init_text_size;
2679 nextval = (unsigned long)mod->module_core+mod->core_text_size;
2681 /* Scan for closest preceeding symbol, and next symbol. (ELF
2682 starts real symbols at 1). */
2683 for (i = 1; i < mod->num_symtab; i++) {
2684 if (mod->symtab[i].st_shndx == SHN_UNDEF)
2687 /* We ignore unnamed symbols: they're uninformative
2688 * and inserted at a whim. */
2689 if (mod->symtab[i].st_value <= addr
2690 && mod->symtab[i].st_value > mod->symtab[best].st_value
2691 && *(mod->strtab + mod->symtab[i].st_name) != '\0'
2692 && !is_arm_mapping_symbol(mod->strtab + mod->symtab[i].st_name))
2694 if (mod->symtab[i].st_value > addr
2695 && mod->symtab[i].st_value < nextval
2696 && *(mod->strtab + mod->symtab[i].st_name) != '\0'
2697 && !is_arm_mapping_symbol(mod->strtab + mod->symtab[i].st_name))
2698 nextval = mod->symtab[i].st_value;
2705 *size = nextval - mod->symtab[best].st_value;
2707 *offset = addr - mod->symtab[best].st_value;
2708 return mod->strtab + mod->symtab[best].st_name;
2711 /* For kallsyms to ask for address resolution. NULL means not found. Careful
2712 * not to lock to avoid deadlock on oopses, simply disable preemption. */
2713 const char *module_address_lookup(unsigned long addr,
2714 unsigned long *size,
2715 unsigned long *offset,
2720 const char *ret = NULL;
2723 list_for_each_entry_rcu(mod, &modules, list) {
2724 if (within_module_init(addr, mod) ||
2725 within_module_core(addr, mod)) {
2727 *modname = mod->name;
2728 ret = get_ksymbol(mod, addr, size, offset);
2732 /* Make a copy in here where it's safe */
2734 strncpy(namebuf, ret, KSYM_NAME_LEN - 1);
2741 int lookup_module_symbol_name(unsigned long addr, char *symname)
2746 list_for_each_entry_rcu(mod, &modules, list) {
2747 if (within_module_init(addr, mod) ||
2748 within_module_core(addr, mod)) {
2751 sym = get_ksymbol(mod, addr, NULL, NULL);
2754 strlcpy(symname, sym, KSYM_NAME_LEN);
2764 int lookup_module_symbol_attrs(unsigned long addr, unsigned long *size,
2765 unsigned long *offset, char *modname, char *name)
2770 list_for_each_entry_rcu(mod, &modules, list) {
2771 if (within_module_init(addr, mod) ||
2772 within_module_core(addr, mod)) {
2775 sym = get_ksymbol(mod, addr, size, offset);
2779 strlcpy(modname, mod->name, MODULE_NAME_LEN);
2781 strlcpy(name, sym, KSYM_NAME_LEN);
2791 int module_get_kallsym(unsigned int symnum, unsigned long *value, char *type,
2792 char *name, char *module_name, int *exported)
2797 list_for_each_entry_rcu(mod, &modules, list) {
2798 if (symnum < mod->num_symtab) {
2799 *value = mod->symtab[symnum].st_value;
2800 *type = mod->symtab[symnum].st_info;
2801 strlcpy(name, mod->strtab + mod->symtab[symnum].st_name,
2803 strlcpy(module_name, mod->name, MODULE_NAME_LEN);
2804 *exported = is_exported(name, *value, mod);
2808 symnum -= mod->num_symtab;
2814 static unsigned long mod_find_symname(struct module *mod, const char *name)
2818 for (i = 0; i < mod->num_symtab; i++)
2819 if (strcmp(name, mod->strtab+mod->symtab[i].st_name) == 0 &&
2820 mod->symtab[i].st_info != 'U')
2821 return mod->symtab[i].st_value;
2825 /* Look for this name: can be of form module:name. */
2826 unsigned long module_kallsyms_lookup_name(const char *name)
2830 unsigned long ret = 0;
2832 /* Don't lock: we're in enough trouble already. */
2834 if ((colon = strchr(name, ':')) != NULL) {
2836 if ((mod = find_module(name)) != NULL)
2837 ret = mod_find_symname(mod, colon+1);
2840 list_for_each_entry_rcu(mod, &modules, list)
2841 if ((ret = mod_find_symname(mod, name)) != 0)
2848 int module_kallsyms_on_each_symbol(int (*fn)(void *, const char *,
2849 struct module *, unsigned long),
2856 list_for_each_entry(mod, &modules, list) {
2857 for (i = 0; i < mod->num_symtab; i++) {
2858 ret = fn(data, mod->strtab + mod->symtab[i].st_name,
2859 mod, mod->symtab[i].st_value);
2866 #endif /* CONFIG_KALLSYMS */
2868 static char *module_flags(struct module *mod, char *buf)
2873 mod->state == MODULE_STATE_GOING ||
2874 mod->state == MODULE_STATE_COMING) {
2876 if (mod->taints & (1 << TAINT_PROPRIETARY_MODULE))
2878 if (mod->taints & (1 << TAINT_FORCED_MODULE))
2880 if (mod->taints & (1 << TAINT_CRAP))
2883 * TAINT_FORCED_RMMOD: could be added.
2884 * TAINT_UNSAFE_SMP, TAINT_MACHINE_CHECK, TAINT_BAD_PAGE don't
2888 /* Show a - for module-is-being-unloaded */
2889 if (mod->state == MODULE_STATE_GOING)
2891 /* Show a + for module-is-being-loaded */
2892 if (mod->state == MODULE_STATE_COMING)
2901 #ifdef CONFIG_PROC_FS
2902 /* Called by the /proc file system to return a list of modules. */
2903 static void *m_start(struct seq_file *m, loff_t *pos)
2905 mutex_lock(&module_mutex);
2906 return seq_list_start(&modules, *pos);
2909 static void *m_next(struct seq_file *m, void *p, loff_t *pos)
2911 return seq_list_next(p, &modules, pos);
2914 static void m_stop(struct seq_file *m, void *p)
2916 mutex_unlock(&module_mutex);
2919 static int m_show(struct seq_file *m, void *p)
2921 struct module *mod = list_entry(p, struct module, list);
2924 seq_printf(m, "%s %u",
2925 mod->name, mod->init_size + mod->core_size);
2926 print_unload_info(m, mod);
2928 /* Informative for users. */
2929 seq_printf(m, " %s",
2930 mod->state == MODULE_STATE_GOING ? "Unloading":
2931 mod->state == MODULE_STATE_COMING ? "Loading":
2933 /* Used by oprofile and other similar tools. */
2934 seq_printf(m, " 0x%p", mod->module_core);
2938 seq_printf(m, " %s", module_flags(mod, buf));
2940 seq_printf(m, "\n");
2944 /* Format: modulename size refcount deps address
2946 Where refcount is a number or -, and deps is a comma-separated list
2949 static const struct seq_operations modules_op = {
2956 static int modules_open(struct inode *inode, struct file *file)
2958 return seq_open(file, &modules_op);
2961 static const struct file_operations proc_modules_operations = {
2962 .open = modules_open,
2964 .llseek = seq_lseek,
2965 .release = seq_release,
2968 static int __init proc_modules_init(void)
2970 proc_create("modules", 0, NULL, &proc_modules_operations);
2973 module_init(proc_modules_init);
2976 /* Given an address, look for it in the module exception tables. */
2977 const struct exception_table_entry *search_module_extables(unsigned long addr)
2979 const struct exception_table_entry *e = NULL;
2983 list_for_each_entry_rcu(mod, &modules, list) {
2984 if (mod->num_exentries == 0)
2987 e = search_extable(mod->extable,
2988 mod->extable + mod->num_exentries - 1,
2995 /* Now, if we found one, we are running inside it now, hence
2996 we cannot unload the module, hence no refcnt needed. */
3001 * is_module_address - is this address inside a module?
3002 * @addr: the address to check.
3004 * See is_module_text_address() if you simply want to see if the address
3005 * is code (not data).
3007 bool is_module_address(unsigned long addr)
3012 ret = __module_address(addr) != NULL;
3019 * __module_address - get the module which contains an address.
3020 * @addr: the address.
3022 * Must be called with preempt disabled or module mutex held so that
3023 * module doesn't get freed during this.
3025 struct module *__module_address(unsigned long addr)
3029 if (addr < module_addr_min || addr > module_addr_max)
3032 list_for_each_entry_rcu(mod, &modules, list)
3033 if (within_module_core(addr, mod)
3034 || within_module_init(addr, mod))
3038 EXPORT_SYMBOL_GPL(__module_address);
3041 * is_module_text_address - is this address inside module code?
3042 * @addr: the address to check.
3044 * See is_module_address() if you simply want to see if the address is
3045 * anywhere in a module. See kernel_text_address() for testing if an
3046 * address corresponds to kernel or module code.
3048 bool is_module_text_address(unsigned long addr)
3053 ret = __module_text_address(addr) != NULL;
3060 * __module_text_address - get the module whose code contains an address.
3061 * @addr: the address.
3063 * Must be called with preempt disabled or module mutex held so that
3064 * module doesn't get freed during this.
3066 struct module *__module_text_address(unsigned long addr)
3068 struct module *mod = __module_address(addr);
3070 /* Make sure it's within the text section. */
3071 if (!within(addr, mod->module_init, mod->init_text_size)
3072 && !within(addr, mod->module_core, mod->core_text_size))
3077 EXPORT_SYMBOL_GPL(__module_text_address);
3079 /* Don't grab lock, we're oopsing. */
3080 void print_modules(void)
3085 printk(KERN_DEFAULT "Modules linked in:");
3086 /* Most callers should already have preempt disabled, but make sure */
3088 list_for_each_entry_rcu(mod, &modules, list)
3089 printk(" %s%s", mod->name, module_flags(mod, buf));
3091 if (last_unloaded_module[0])
3092 printk(" [last unloaded: %s]", last_unloaded_module);
3096 #ifdef CONFIG_MODVERSIONS
3097 /* Generate the signature for all relevant module structures here.
3098 * If these change, we don't want to try to parse the module. */
3099 void module_layout(struct module *mod,
3100 struct modversion_info *ver,
3101 struct kernel_param *kp,
3102 struct kernel_symbol *ks,
3103 struct tracepoint *tp)
3106 EXPORT_SYMBOL(module_layout);
3109 #ifdef CONFIG_TRACEPOINTS
3110 void module_update_tracepoints(void)
3114 mutex_lock(&module_mutex);
3115 list_for_each_entry(mod, &modules, list)
3117 tracepoint_update_probe_range(mod->tracepoints,
3118 mod->tracepoints + mod->num_tracepoints);
3119 mutex_unlock(&module_mutex);
3123 * Returns 0 if current not found.
3124 * Returns 1 if current found.
3126 int module_get_iter_tracepoints(struct tracepoint_iter *iter)
3128 struct module *iter_mod;
3131 mutex_lock(&module_mutex);
3132 list_for_each_entry(iter_mod, &modules, list) {
3133 if (!iter_mod->taints) {
3135 * Sorted module list
3137 if (iter_mod < iter->module)
3139 else if (iter_mod > iter->module)
3140 iter->tracepoint = NULL;
3141 found = tracepoint_get_iter_range(&iter->tracepoint,
3142 iter_mod->tracepoints,
3143 iter_mod->tracepoints
3144 + iter_mod->num_tracepoints);
3146 iter->module = iter_mod;
3151 mutex_unlock(&module_mutex);