linux-kernel - Re: kernel: signal: NULL ptr deref when killing process

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Message-ID: <53F60E58.2050708@oracle.com>
Date:	Thu, 21 Aug 2014 11:20:56 -0400
From:	Sasha Levin <sasha.levin@...cle.com>
To:	Oleg Nesterov <oleg@...hat.com>,
	David Howells <dhowells@...hat.com>
CC:	Andrew Morton <akpm@...ux-foundation.org>, richard@....at,
	Dave Jones <davej@...hat.com>,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: kernel: signal: NULL ptr deref when killing process

On 08/20/2014 10:12 AM, Oleg Nesterov wrote:
> On 08/20, Sasha Levin wrote:
>> >
>> > Hi all,
>> >
>> > While fuzzing with trinity inside a KVM tools guest running the latest -next
>> > kernel, I've stumbled on the following spew:
> Thanks...
> 
> looks like, kill_ok_by_cred()->__task_cred(t) returns NULL at first glance.
> perhaps you can show the result of "make kernel/signal.s" to be sure? Or at
> least the full "objdump -d kernel/signal.o".

Attached.

Thanks,
Sasha

Download attachment "signal.s.xz" of type "application/x-xz" (168828 bytes)