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

Andy Lutomirski
2014-06-16T17:50:25Z

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

On Mon, Jun 16, 2014 at 10:36 AM, Toralf Förster <toralf.foerster@gmx.de> wrote:
> On 06/16/2014 07:32 PM, Andy Lutomirski wrote:
>> On Mon, Jun 16, 2014 at 10:29 AM, Richard Weinberger <richard@nod.at> wrote:
>>> Am 16.06.2014 19:25, schrieb Andy Lutomirski:
>>>> On Mon, Jun 16, 2014 at 10:21 AM, Richard Weinberger
>>>> <richard.weinberger@gmail.com> wrote:
>>>>> On Mon, Jun 16, 2014 at 6:33 PM, Toralf Förster <toralf.foerster@gmx.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