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perf: Fix orphan hole

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We should set event->owner before we install the event,
otherwise there is a hole where the target task can fork() and
we'll not inherit the event because it thinks the event is
orphaned.

Signed-off-by: Peter Zijlstra <[email protected]>
Cc: Arnaldo Carvalho de Melo <[email protected]>
Cc: Jiri Olsa <[email protected]>
Cc: Linus Torvalds <[email protected]>
Cc: Thomas Gleixner <[email protected]>
Cc: [email protected]
Signed-off-by: Ingo Molnar <[email protected]>
This commit is contained in:
Peter Zijlstra 2016-01-25 14:08:45 +01:00 • committed by Ingo Molnar
commit 78cd2c748f
1 changed files with 2 additions and 2 deletions
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4
kernel/events/core.c
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@ -8489,6 +8489,8 @@ SYSCALL_DEFINE5(perf_event_open,
perf_event__header_size(event);
perf_event__id_header_size(event);
event->owner = current;
perf_install_in_context(ctx, event, event->cpu);
perf_unpin_context(ctx);
@ -8498,8 +8500,6 @@ SYSCALL_DEFINE5(perf_event_open,
put_online_cpus();
event->owner = current;
mutex_lock(&current->perf_event_mutex);
list_add_tail(&event->owner_entry, &current->perf_event_list);
mutex_unlock(&current->perf_event_mutex);