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Merge branch 'perf-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip

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Pull perf fix from Ingo Molnar:
 "A single fix to not allow nonsensical event groups that result in
  kernel warnings"

* 'perf-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
  perf/core: Fix group {cpu,task} validation
This commit is contained in:
Linus Torvalds 2017-08-26 08:59:50 -07:00
commit 53ede64de3
1 changed files with 19 additions and 20 deletions
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39
kernel/events/core.c
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@ -10032,28 +10032,27 @@ SYSCALL_DEFINE5(perf_event_open,
goto err_context;
/*
* Do not allow to attach to a group in a different
* task or CPU context:
* Make sure we're both events for the same CPU;
* grouping events for different CPUs is broken; since
* you can never concurrently schedule them anyhow.
*/
if (move_group) {
/*
* Make sure we're both on the same task, or both
* per-cpu events.
*/
if (group_leader->ctx->task != ctx->task)
goto err_context;
if (group_leader->cpu != event->cpu)
goto err_context;
/*
* Make sure we're both events for the same CPU;
* grouping events for different CPUs is broken; since
* you can never concurrently schedule them anyhow.
*/
if (group_leader->cpu != event->cpu)
goto err_context;
} else {
if (group_leader->ctx != ctx)
goto err_context;
}
/*
* Make sure we're both on the same task, or both
* per-CPU events.
*/
if (group_leader->ctx->task != ctx->task)
goto err_context;
/*
* Do not allow to attach to a group in a different task
* or CPU context. If we're moving SW events, we'll fix
* this up later, so allow that.
*/
if (!move_group && group_leader->ctx != ctx)
goto err_context;
/*
* Only a group leader can be exclusive or pinned