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authorPeter Zijlstra <peterz@infradead.org>2016-01-25 16:08:45 +0300
committerIngo Molnar <mingo@kernel.org>2016-01-28 22:06:35 +0300
commit78cd2c748f459739ff864dd9308c0f6caf7f6e41 (patch)
treeb25470373d9ed5c038833854b466e3725a56cf68 /kernel/events
parent45c815f06b80031659c63d7b93e580015d6024dd (diff)
downloadlinux-78cd2c748f459739ff864dd9308c0f6caf7f6e41.tar.xz
perf: Fix orphan hole
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 <peterz@infradead.org> Cc: Arnaldo Carvalho de Melo <acme@redhat.com> Cc: Jiri Olsa <jolsa@redhat.com> Cc: Linus Torvalds <torvalds@linux-foundation.org> Cc: Thomas Gleixner <tglx@linutronix.de> Cc: linux-kernel@vger.kernel.org Signed-off-by: Ingo Molnar <mingo@kernel.org>
Diffstat (limited to 'kernel/events')
-rw-r--r--kernel/events/core.c4
1 files changed, 2 insertions, 2 deletions
diff --git a/kernel/events/core.c b/kernel/events/core.c
index 9de4d352ba8c..6759f2a332d7 100644
--- a/kernel/events/core.c
+++ b/kernel/events/core.c
@@ -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);