linux-kernel - Re: 3.15: kernel BUG at kernel/auditsc.c:1525!

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Message-ID: <CALCETrVw6f7iy4qTMgSt8k9N4rOWJ_mm9LbrtVZ9YFORacriSQ@mail.gmail.com>
Date:	Mon, 16 Jun 2014 10:50:01 -0700
From:	Andy Lutomirski <luto@...capital.net>
To:	Toralf Förster <toralf.foerster@....de>,
	Eric Paris <eparis@...hat.com>
Cc:	Richard Weinberger <richard@....at>,
	Richard Weinberger <richard.weinberger@...il.com>,
	Linux Kernel <linux-kernel@...r.kernel.org>
Subject: Re: 3.15: kernel BUG at kernel/auditsc.c:1525!

cc: eparis.  This might be a new audit bug.

On Mon, Jun 16, 2014 at 10:36 AM, Toralf Förster <toralf.foerster@....de> wrote:
> On 06/16/2014 07:32 PM, Andy Lutomirski wrote:
>> On Mon, Jun 16, 2014 at 10:29 AM, Richard Weinberger <richard@....at> wrote:
>>> Am 16.06.2014 19:25, schrieb Andy Lutomirski:
>>>> On Mon, Jun 16, 2014 at 10:21 AM, Richard Weinberger
>>>> <richard.weinberger@...il.com> wrote:
>>>>> On Mon, Jun 16, 2014 at 6:33 PM, Toralf Förster <toralf.foerster@....de> wrote:
>>>>>> $ cat syscall.c
>>>>>> #include <unistd.h>
>>>>>> #include <sys/syscall.h>
>>>>>> int main(){return syscall(1000)!=-1;}
>>>>
>>>> What architecture are you building for?  On i386 and x86_64, 1000
>>>> shouldn't be big enough to trigger this.
>>>
>>> Toralf, is this an UML kernel?
>>>
>>
>> I'm also interested in the userspace architecture.  If it's x32
>> userspace, then I'm not surprised that there's a problem.
>
> It is a x86 system (ThinkPad T420) - not x32.

I don't think this is CVE-2014-3917.  It looks like you're hitting this BUG:

BUG_ON(context->in_syscall || context->name_count);

Can you send the output of:

auditctl -l [run as root]

and

dmesg |grep audit

Are you using ptrace or anything like that (e.g. strace) when you
trigger this?  Are you using a funny glibc version?  Do you have
selinux or something like that enabled?

--Andy
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