Peter Zijlstra 9c2b9d30e2 perf: Fix perf bug in fork()
Oleg noticed that a cleanup by Sylvain actually uncovered a bug; by
calling perf_event_free_task() when failing sched_fork() we will not yet
have done the memset() on ->perf_event_ctxp[] and will therefore try and
'free' the inherited contexts, which are still in use by the parent
process.

This is bad and might explain some outstanding fuzzer failures ...

Suggested-by: Oleg Nesterov <oleg@redhat.com>
Reported-by: Oleg Nesterov <oleg@redhat.com>
Reported-by: Sylvain 'ythier' Hitier <sylvain.hitier@gmail.com>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Cc: Aaron Tomlin <atomlin@redhat.com>
Cc: Andrew Morton <akpm@linux-foundation.org>
Cc: Arnaldo Carvalho de Melo <acme@kernel.org>
Cc: Daeseok Youn <daeseok.youn@gmail.com>
Cc: David Rientjes <rientjes@google.com>
Cc: Kees Cook <keescook@chromium.org>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Rik van Riel <riel@redhat.com>
Cc: Vladimir Davydov <vdavydov@parallels.com>
Cc: <stable@vger.kernel.org>
Link: http://lkml.kernel.org/r/20140929101201.GE5430@worktop
Signed-off-by: Ingo Molnar <mingo@kernel.org>
2014-10-03 05:41:08 +02:00
..
2014-06-12 16:18:45 +02:00
2014-10-03 05:41:08 +02:00
2014-08-25 21:13:30 +02:00
2014-08-08 15:57:18 -07:00
2014-09-18 12:32:52 -04:00
2014-07-05 11:17:45 +02:00
2014-10-03 05:41:08 +02:00
2014-09-10 15:42:12 -07:00
2014-08-08 15:57:32 -07:00
2014-08-08 15:57:24 -07:00
2014-07-17 22:07:37 +02:00
2014-08-08 15:57:22 -07:00
2014-08-08 15:57:24 -07:00