Re: file access causes a kernel bug

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On 01/30/2014 12:27 PM, Richard Yao wrote:
> On 01/30/2014 12:07 PM, Matthew Thode wrote:
>> On 01/30/2014 10:41 AM, Stephen Smalley wrote:
>>> On 01/30/2014 10:51 AM, Matthew Thode wrote:
>>>> On 01/30/2014 09:45 AM, Stephen Smalley wrote:
>>>>> We'll have to investigate, as that obviously shouldn't be possible.
>>>>> Wouldn't be allowed in enforcing mode or for any non-root process.
> 
> This is an untested conjecture, but I believe that a FUSE filesystem
> could be used to trigger this in enforcing mode. If I am right, a custom
> FUSE filesystem could trigger it with ease. However, I do not see what
> that would accomplish beyond triggering the BUG_ON.

SELinux does not presently request or use xattrs from FUSE filesystems,
so I don't believe this is presently an issue, but I understand.

> 
>>> Try the attached patch.
>>>
>>>
>> Confirmed that this fixes it :D thanks a ton for this.
> 
> This patch looks good to me. Feel free to append my Acked-by:
> 
> Acked-by: Richard Yao <ryao@xxxxxxxxxx>
> 

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