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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