[stable] please do not merge 058504edd026 (was Re: fs: use after free in /proc/pid/mountinfo)

[David Rientjes]

On Fri, 4 Jul 2014, Sasha Levin wrote:

> > Does this now reproduce on Linus's tree?  If so, does reverting commit
> > 058504edd026 ("fs/seq_file: fallback to vmalloc allocation") prevent this 
> > issue?
> > 
> > This is a use-after-free since the poison value is 0x6b and I'm presuming 
> > that your /proc/self/mountinfo may be larger than PAGE_SIZE in your 
> > testing environment.
> > 
> 
> Good call, reverting that patch made both issues go away.
> 

Thanks for checking, Sasha.

Stable maintainers, please do not merge commit 058504edd026 ("fs/seq_file: 
fallback to vmalloc allocation") that is annotated with a cc for 
stable@xxxxxxxxxxxxxxx in Linus's tree into stable kernels.

Although we're at 3.16-rc3, I'm hoping that we can get a fix for the 
use-after-free in the next couple days before asking for a revert.  Sasha 
confirms[*] this commit causes the bug.

Thanks.

 [*] http://marc.info/?l=linux-kernel&m=140448573612154
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