linux-kernel - Re: Fwd: Potential out-of-bounds in ftrace_regex

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Message-ID: <20131002223437.GA15728@redhat.com>
Date:	Wed, 2 Oct 2013 18:34:37 -0400
From:	Dave Jones <davej@...hat.com>
To:	Steven Rostedt <rostedt@...dmis.org>
Cc:	Andrey Konovalov <andreyknvl@...gle.com>,
	linux-kernel@...r.kernel.org, fweisbec@...il.com, mingo@...hat.com,
	Dmitry Vyukov <dvyukov@...gle.com>,
	Kostya Serebryany <kcc@...gle.com>
Subject: Re: Fwd: Potential out-of-bounds in ftrace_regex_release

On Wed, Oct 02, 2013 at 04:18:02PM -0400, Steven Rostedt wrote:
 > On Wed, 2013-10-02 at 14:57 -0400, Dave Jones wrote:
 > 
 > > And that's the cause. I wonder what was being opened.
 > > Do you happen to have a trinity-child log for that thread ?
 > 
 > Thanks for the update. This definitely looks like the bug, and explains
 > a lot. I'll look into this, as I'm currently at a conference, it may be
 > sporadic.

another potential clue.. I looked over some logs from some crashes, and saw that just before
the crash, there was a call to unshare(), after which the uid changed from 1000 to 65534.
Is that something that ftrace is prepared for ?

	Dave

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