linux-kernel - Re: [PATCH 1/2] aio: fix aio request leak when events are reaped by userspace

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Message-ID: <x49a992b25p.fsf@segfault.boston.devel.redhat.com>
Date:	Tue, 24 Jun 2014 14:20:02 -0400
From:	Jeff Moyer <jmoyer@...hat.com>
To:	Benjamin LaHaise <bcrl@...ck.org>
Cc:	Linus Torvalds <torvalds@...ux-foundation.org>,
	security@...nel.org, linux-aio@...ck.org,
	linux-kernel@...r.kernel.org, Mateusz Guzik <mguzik@...hat.com>,
	Petr Matousek <pmatouse@...hat.com>,
	Kent Overstreet <kmo@...erainc.com>, stable@...r.kernel.org
Subject: Re: [PATCH 1/2] aio: fix aio request leak when events are reaped by userspace

Benjamin LaHaise <bcrl@...ck.org> writes:

> The aio cleanups and optimizations by kmo that were merged into the 3.10
> tree added a regression for userspace event reaping.  Specifically, the
> reference counts are not decremented if the event is reaped in userspace,
> leading to the application being unable to submit further aio requests.
> This patch applies to 3.12+.  A separate backport is required for 3.10/3.11.
> This issue was uncovered as part of CVE-2014-0206.
>
> Signed-off-by: Benjamin LaHaise <bcrl@...ck.org>

Reviewed-by: Jeff Moyer <jmoyer@...hat.com>
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