[PATCH] Security: List corruption occured during file system automation test

[Shivnandan Kumar]

Hi  Stephen Smalley,

Reproduction path :- 
We do random  file system operation ( e.g. - Saving, Open, Play, Delete ) of files and during this some time we  abruptly power off the device.

Thanks,
Shivnandan

------- Original Message -------
Sender : Stephen Smalley<sds@xxxxxxxxxxxxx>
Date : Aug 26, 2014 23:46 (GMT+09:00)
Title : Re: [PATCH] Security: List corruption occured during file system automation test

Do you have a reproducer test case to trigger the bug?

On 08/21/2014 06:29 AM, Shivnandan Kumar wrote:
> Dear Eric Paris,
> 
> Sorry for the late reply.
> Yes I have back trace and I am attaching it.
> 
> First time the issue is reproduced then I have added some debug statement in the 
> file kernel/security/selinux/hooks.c to narrow down the problem  and then we 
> reproduce the issue again.
> I am attaching  complete back trace as well as my additional debug patch for 
> your reference.
> 
> Thanks,
> 
> Shivnandan
> 
> ------- *Original Message* -------
> 
> *Sender* : Eric Paris
> 
> *Date* : Aug 14, 2014 05:27 (GMT+09:00)
> 
> *Title* : Re: [PATCH] Security: List corruption occured during file system 
> automation test
> 
> Do you have a backtrace?
> 
> On Wed, Aug 13, 2014 at 8:30 AM, Al Viro wrote:
>  > On Wed, Aug 13, 2014 at 05:04:13PM +0530, shivnandan.k@xxxxxxxxxxx wrote:
>  >> From: Shivnandan Kumar
>  >>
>  >> List element was freed by  inode_free_security and then it uses rcu
>  >> element to point inode_free_rcu, since it inside a union so it
>  >> shares memory, sb_finish_set_opts now also try to free list element,
>  >
>  > How in hell does it find that element?
> 
> Thanks and Regards,
> 
> Shivnandan Kumar
> 
> 
> 
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Thanks and Regards,
Shivnandan Kumar