lkml.org 
[lkml]   [2014]   [Sep]   [29]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
Date
From
SubjectRe: [PATCH] fork.c: copy_process(): fix cleanup WRT perf_event_free_task()
On Mon, Sep 29, 2014 at 02:07:22PM +0200, Ingo Molnar wrote:
>
> * Peter Zijlstra <peterz@infradead.org> wrote:
>
> > Subject: 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..
> >
> > 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>
>
> Could this fix a couple of fuzzer triggered perf crashes perhaps?

It could indeed I suppose.. you never know what paths those fuzzers
manage to hit.


\
 
 \ /
  Last update: 2014-09-29 16:21    [W:2.378 / U:0.488 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site