platform/chrome: cros_ec_debugfs: detach log reader wq from devm

[ Upstream commit 0e8eb5e8acbad19ac2e1856b2fb2320184299b33 ]

Debugfs console_log uses devm memory (e.g. debug_info in
cros_ec_console_log_poll()).  However, lifecycles of device and debugfs
are independent.  An use-after-free issue is observed if userland
program operates the debugfs after the memory has been freed.

The call trace:
 do_raw_spin_lock
 _raw_spin_lock_irqsave
 remove_wait_queue
 ep_unregister_pollwait
 ep_remove
 do_epoll_ctl

A Python example to reproduce the issue:
... import select
... p = select.epoll()
... f = open('/sys/kernel/debug/cros_scp/console_log')
... p.register(f, select.POLLIN)
... p.poll(1)
[(4, 1)]                    # 4=fd, 1=select.POLLIN

[ shutdown cros_scp at the point ]

... p.poll(1)
[(4, 16)]                   # 4=fd, 16=select.POLLHUP
... p.unregister(f)

An use-after-free issue raises here.  It called epoll_ctl with
EPOLL_CTL_DEL which in turn to use the workqueue in the devm (i.e.
log_wq).

Detaches log reader's workqueue from devm to make sure it is persistent
even if the device has been removed.

Signed-off-by: Tzung-Bi Shih <tzungbi@google.com>
Reviewed-by: Guenter Roeck <groeck@google.com>
Link: https://lore.kernel.org/r/20220209051130.386175-1-tzungbi@google.com
Signed-off-by: Benson Leung <bleung@chromium.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>

diff --git a/drivers/platform/chrome/cros_ec_debugfs.c b/drivers/platform/chrome/cros_ec_debugfs.c
index 272c898..0dbceee 100644 (file)
--- a/drivers/platform/chrome/cros_ec_debugfs.c
+++ b/drivers/platform/chrome/cros_ec_debugfs.c
@@ -25,6 +25,9 @@
 
 #define CIRC_ADD(idx, size, value)     (((idx) + (value)) & ((size) - 1))
 
+/* waitqueue for log readers */
+static DECLARE_WAIT_QUEUE_HEAD(cros_ec_debugfs_log_wq);
+
 /**
  * struct cros_ec_debugfs - EC debugging information.
  *
@@ -33,7 +36,6 @@
  * @log_buffer: circular buffer for console log information
  * @read_msg: preallocated EC command and buffer to read console log
  * @log_mutex: mutex to protect circular buffer
- * @log_wq: waitqueue for log readers
  * @log_poll_work: recurring task to poll EC for new console log data
  * @panicinfo_blob: panicinfo debugfs blob
  */
@@ -44,7 +46,6 @@ struct cros_ec_debugfs {
        struct circ_buf log_buffer;
        struct cros_ec_command *read_msg;
        struct mutex log_mutex;
-       wait_queue_head_t log_wq;
        struct delayed_work log_poll_work;
        /* EC panicinfo */
        struct debugfs_blob_wrapper panicinfo_blob;
@@ -107,7 +108,7 @@ static void cros_ec_console_log_work(struct work_struct *__work)
                        buf_space--;
                }
 
-               wake_up(&debug_info->log_wq);
+               wake_up(&cros_ec_debugfs_log_wq);
        }
 
        mutex_unlock(&debug_info->log_mutex);
@@ -141,7 +142,7 @@ static ssize_t cros_ec_console_log_read(struct file *file, char __user *buf,
 
                mutex_unlock(&debug_info->log_mutex);
 
-               ret = wait_event_interruptible(debug_info->log_wq,
+               ret = wait_event_interruptible(cros_ec_debugfs_log_wq,
                                        CIRC_CNT(cb->head, cb->tail, LOG_SIZE));
                if (ret < 0)
                        return ret;
@@ -173,7 +174,7 @@ static __poll_t cros_ec_console_log_poll(struct file *file,
        struct cros_ec_debugfs *debug_info = file->private_data;
        __poll_t mask = 0;
 
-       poll_wait(file, &debug_info->log_wq, wait);
+       poll_wait(file, &cros_ec_debugfs_log_wq, wait);
 
        mutex_lock(&debug_info->log_mutex);
        if (CIRC_CNT(debug_info->log_buffer.head,
@@ -377,7 +378,6 @@ static int cros_ec_create_console_log(struct cros_ec_debugfs *debug_info)
        debug_info->log_buffer.tail = 0;
 
        mutex_init(&debug_info->log_mutex);
-       init_waitqueue_head(&debug_info->log_wq);
 
        debugfs_create_file("console_log", S_IFREG | 0444, debug_info->dir,
                            debug_info, &cros_ec_console_log_fops);