use after free in fork()

Stefan Bader stefan.bader at
Mon Nov 20 15:29:41 UTC 2017

On 16.11.2017 23:17, Jason A. Donenfeld wrote:
> Hey guys,
> I think you may have forgotten to backport this into your 16.04 hwe
> kernel (and maybe others too that I haven't tried):

Hi Jason,

could you open a launchpad bug for this? Ideal would be to run "ubuntu-bug
linux" on an affected machine (just one running the hwe kernel to get the
environment right). Note down the patch reference below in the description and
let us know the bug number here. Thanks.

From a quick check, the patch was for 4.7+ and fixed in 4.13, so hwe would be
the only affected kernel version. Upstream stable only picked it up in 4.12.10
as any older versions were already out of support.


> I'm able to pretty quickly oops a kernel, and I've actually been
> experiencing this in the wild on network-facing boxes when the
> scheduler is under high load.
> Can you patch?
> Thanks,
> Jason

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