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From: Peter Zijlstra <peterz@infradead.org>
To: Vince Weaver <vincent.weaver@maine.edu>
Cc: Al Viro <viro@zeniv.linux.org.uk>,
	linux-kernel@vger.kernel.org, Paul Mackerras <paulus@samba.org>,
	Ingo Molnar <mingo@redhat.com>,
	Arnaldo Carvalho de Melo <acme@ghostprotocols.net>,
	trinity@vger.kernel.org
Subject: Re: OOPS in perf_mmap_close()
Date: Wed, 29 May 2013 09:44:33 +0200	[thread overview]
Message-ID: <20130529074433.GB12193@twins.programming.kicks-ass.net> (raw)
In-Reply-To: <alpine.DEB.2.10.1305281418120.19080@vincent-weaver-1.um.maine.edu>

On Tue, May 28, 2013 at 02:22:11PM -0400, Vince Weaver wrote:
> On Tue, 28 May 2013, Vince Weaver wrote:
> 
> > It looks like this is already in tip, but I can confirm that this 
> > patch seems to fix things on my machine and holds up against longer 
> > fuzzing runs.
> 
> OK, I take it back.  Even with the new patch applied, my fuzzer can still 
> make the kernel leak user->locked_vm
> 
> I assume that the locked_vm value should go back to 0 once a process that 
> has a bunch of mmap'd perf_events opened exits?

Yep.

> I admit this is sort of an obscure corner case, but it does mean that a 
> user can leak user->locked_vm to the point that "perf record" no longer 
> works.

Hurm.. I don't suppose you have an easy reproducer handy eh? I'll go
stare at it. At least the current state is better than before, but
clearly we're not quite there yet.

  reply	other threads:[~2013-05-29  7:44 UTC|newest]

Thread overview: 65+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2013-05-22 19:35 OOPS in perf_mmap_close() Vince Weaver
2013-05-22 19:35 ` Vince Weaver
2013-05-22 23:56 ` Vince Weaver
2013-05-23  3:48   ` Vince Weaver
2013-05-23  4:48     ` Al Viro
2013-05-23 10:41       ` Peter Zijlstra
2013-05-23 14:09         ` Christoph Lameter
2013-05-23 15:24           ` Peter Zijlstra
2013-05-23 16:12             ` Christoph Lameter
2013-05-23 16:39               ` Peter Zijlstra
2013-05-23 17:59                 ` Christoph Lameter
2013-05-23 19:24                   ` Peter Zijlstra
2013-05-24 14:01                   ` [RFC][PATCH] mm: Fix RLIMIT_MEMLOCK Peter Zijlstra
2013-05-24 14:01                     ` Peter Zijlstra
2013-05-24 15:40                     ` Christoph Lameter
2013-05-24 15:40                       ` Christoph Lameter
2013-05-26  1:11                       ` KOSAKI Motohiro
2013-05-26  1:11                         ` KOSAKI Motohiro
2013-05-28 16:19                         ` Christoph Lameter
2013-05-28 16:19                           ` Christoph Lameter
2013-05-27  6:48                       ` Peter Zijlstra
2013-05-27  6:48                         ` Peter Zijlstra
2013-05-28 16:37                         ` Christoph Lameter
2013-05-28 16:37                           ` Christoph Lameter
2013-05-29  7:58                           ` [regression] " Ingo Molnar
2013-05-29  7:58                             ` Ingo Molnar
2013-05-29 19:53                             ` KOSAKI Motohiro
2013-05-29 19:53                               ` KOSAKI Motohiro
2013-05-30  6:32                               ` Ingo Molnar
2013-05-30  6:32                                 ` Ingo Molnar
2013-05-30 20:42                                 ` KOSAKI Motohiro
2013-05-30 20:42                                   ` KOSAKI Motohiro
2013-05-31  9:27                                   ` Ingo Molnar
2013-05-31  9:27                                     ` Ingo Molnar
2013-05-30 18:30                           ` Peter Zijlstra
2013-05-30 18:30                             ` Peter Zijlstra
2013-05-30 19:59                           ` Pekka Enberg
2013-05-30 19:59                             ` Pekka Enberg
2013-05-30 21:00                     ` KOSAKI Motohiro
2013-05-30 21:00                       ` KOSAKI Motohiro
2013-05-23 12:52       ` OOPS in perf_mmap_close() Peter Zijlstra
2013-05-23 14:10         ` Vince Weaver
2013-05-23 15:26           ` Peter Zijlstra
2013-05-23 15:47             ` Vince Weaver
2013-05-23 23:40             ` Vince Weaver
2013-05-24  9:21               ` Peter Zijlstra
2013-05-28  8:55               ` Peter Zijlstra
2013-05-28 13:29                 ` [tip:perf/urgent] perf: Fix perf mmap bugs tip-bot for Peter Zijlstra
2013-06-04  8:44                   ` Peter Zijlstra
2013-06-05 11:55                     ` Peter Zijlstra
2013-06-19 18:38                     ` [tip:perf/core] perf: Fix mmap() accounting hole tip-bot for Peter Zijlstra
2013-05-28 16:19                 ` OOPS in perf_mmap_close() Vince Weaver
2013-05-28 18:22                   ` Vince Weaver
2013-05-29  7:44                     ` Peter Zijlstra [this message]
2013-05-29 13:17                       ` Vince Weaver
2013-05-29 19:18                       ` Vince Weaver
2013-05-30  7:25                         ` Peter Zijlstra
2013-05-30 12:51                           ` Vince Weaver
2013-05-31 15:46                             ` Peter Zijlstra
2013-06-03 13:26                             ` Peter Zijlstra
2013-06-03 17:18                               ` Peter Zijlstra
2013-06-03 19:25                               ` Peter Zijlstra
2013-06-05 15:54                                 ` Vince Weaver
2013-06-05 16:54                                   ` Peter Zijlstra
2013-05-29  8:07                   ` Ingo Molnar

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