From: Kees Cook <keescook@chromium.org>
To: Paul Menzel <pmenzel@molgen.mpg.de>
Cc: Andrew Morton <akpm@linux-foundation.org>,
LKML <linux-kernel@vger.kernel.org>,
amd-gfx@lists.freedesktop.org, Duncan <1i5t5.duncan@cox.net>,
Anthony Ruhier <anthony.ruhier@gmail.com>,
Vinicius <mphantomx@yahoo.com.br>,
Thorsten Leemhuis <regressions@leemhuis.info>
Subject: Re: [Regression] hangs caused by commit 3202fa62fb (slub: relocate freelist pointer to middle of object)
Date: Tue, 21 Jul 2020 12:00:36 -0700 [thread overview]
Message-ID: <202007211156.D8BEDEA247@keescook> (raw)
In-Reply-To: <15cbac6d-1f96-2ba9-cb54-08af6682f56d@molgen.mpg.de>
On Tue, Jul 21, 2020 at 04:55:12PM +0200, Paul Menzel wrote:
> No idea, if you are aware of it yet, but three people verified that commit
> 3202fa62fb (slub: relocate freelist pointer to middle of object) causes a
> regression on AMD hardware [1].
Hi, thanks for emailing; I don't get bugzilla notifications, so I hadn't
seen this yet.
> It’d be great, if you took a look, and advised if this commit (and
> follow-ups) should be reverted, until the issue is analyzed.
There have been a number of fixes to that commit (which I see are
mentioned in a quick skim of the bug), but they've mostly been around
additional slab debugging features. If it's causing a problem outside
of that, my instinct would be there might be a use-after-free happening,
but I'll go read the bug more closely now, and comment there (or here,
if needed).
Thanks!
--
Kees Cook
prev parent reply other threads:[~2020-07-21 19:00 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-07-21 14:55 [Regression] hangs caused by commit 3202fa62fb (slub: relocate freelist pointer to middle of object) Paul Menzel
2020-07-21 19:00 ` Kees Cook [this message]
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