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This is the 5.4.88 stable release

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Merge 5.4.88 into android11-5.4-lts

Changes in 5.4.88
	Revert "drm/amd/display: Fix memory leaks in S3 resume"
	Revert "mtd: spinand: Fix OOB read"
	dmaengine: at_hdmac: Substitute kzalloc with kmalloc
	dmaengine: at_hdmac: add missing put_device() call in at_dma_xlate()
	dmaengine: at_hdmac: add missing kfree() call in at_dma_xlate()
	kdev_t: always inline major/minor helper functions
	iio:imu:bmi160: Fix alignment and data leak issues
	fuse: fix bad inode
	perf: Break deadlock involving exec_update_mutex
	rwsem: Implement down_read_killable_nested
	rwsem: Implement down_read_interruptible
	exec: Transform exec_update_mutex into a rw_semaphore
	mwifiex: Fix possible buffer overflows in mwifiex_cmd_802_11_ad_hoc_start
	Linux 5.4.88

Signed-off-by: Greg Kroah-Hartman <[email protected]>
Change-Id: I2e7792fc0001b7df699b4477fabf97914c0aeceb
This commit is contained in:
Greg Kroah-Hartman 2021-01-11 14:29:58 +01:00
commit 51e9c21c50
24 changed files with 211 additions and 103 deletions
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52
kernel/events/core.c
View file

@ -1254,7 +1254,7 @@ static void put_ctx(struct perf_event_context *ctx)
* function.
*
* Lock order:
* exec_update_mutex
* exec_update_lock
* task_struct::perf_event_mutex
* perf_event_context::mutex
* perf_event::child_mutex;
@ -11036,24 +11036,6 @@ SYSCALL_DEFINE5(perf_event_open,
goto err_task;
}
if (task) {
err = mutex_lock_interruptible(&task->signal->exec_update_mutex);
if (err)
goto err_task;
/*
* Reuse ptrace permission checks for now.
*
* We must hold exec_update_mutex across this and any potential
* perf_install_in_context() call for this new event to
* serialize against exec() altering our credentials (and the
* perf_event_exit_task() that could imply).
*/
err = -EACCES;
if (!ptrace_may_access(task, PTRACE_MODE_READ_REALCREDS))
goto err_cred;
}
if (flags & PERF_FLAG_PID_CGROUP)
cgroup_fd = pid;
@ -11061,7 +11043,7 @@ SYSCALL_DEFINE5(perf_event_open,
NULL, NULL, cgroup_fd);
if (IS_ERR(event)) {
err = PTR_ERR(event);
goto err_cred;
goto err_task;
}
if (is_sampling_event(event)) {
@ -11180,6 +11162,24 @@ SYSCALL_DEFINE5(perf_event_open,
goto err_context;
}
if (task) {
err = down_read_interruptible(&task->signal->exec_update_lock);
if (err)
goto err_file;
/*
* Preserve ptrace permission check for backwards compatibility.
*
* We must hold exec_update_lock across this and any potential
* perf_install_in_context() call for this new event to
* serialize against exec() altering our credentials (and the
* perf_event_exit_task() that could imply).
*/
err = -EACCES;
if (!ptrace_may_access(task, PTRACE_MODE_READ_REALCREDS))
goto err_cred;
}
if (move_group) {
gctx = __perf_event_ctx_lock_double(group_leader, ctx);
@ -11333,7 +11333,7 @@ SYSCALL_DEFINE5(perf_event_open,
mutex_unlock(&ctx->mutex);
if (task) {
mutex_unlock(&task->signal->exec_update_mutex);
up_read(&task->signal->exec_update_lock);
put_task_struct(task);
}
@ -11355,7 +11355,10 @@ err_locked:
if (move_group)
perf_event_ctx_unlock(group_leader, gctx);
mutex_unlock(&ctx->mutex);
/* err_file: */
err_cred:
if (task)
up_read(&task->signal->exec_update_lock);
err_file:
fput(event_file);
err_context:
perf_unpin_context(ctx);
@ -11367,9 +11370,6 @@ err_alloc:
*/
if (!event_file)
free_event(event);
err_cred:
if (task)
mutex_unlock(&task->signal->exec_update_mutex);
err_task:
if (task)
put_task_struct(task);
@ -11674,7 +11674,7 @@ static void perf_event_exit_task_context(struct task_struct *child, int ctxn)
/*
* When a child task exits, feed back event values to parent events.
*
* Can be called with exec_update_mutex held when called from
* Can be called with exec_update_lock held when called from
* install_exec_creds().
*/
void perf_event_exit_task(struct task_struct *child)