From: Kees Cook <keescook@chromium.org>
To: Andrew Morton <akpm@linux-foundation.org>
Cc: Kees Cook <keescook@chromium.org>,
Christoph Lameter <cl@linux.com>,
Vlastimil Babka <vbabka@suse.cz>,
Waiman Long <longman@redhat.com>, Marco Elver <elver@google.com>,
Pekka Enberg <penberg@kernel.org>,
David Rientjes <rientjes@google.com>,
Joonsoo Kim <iamjoonsoo.kim@lge.com>,
Roman Gushchin <guro@fb.com>,
linux-kernel@vger.kernel.org, linux-doc@vger.kernel.org,
linux-mm@kvack.org
Subject: [PATCH v3 0/3] Actually fix freelist pointer vs redzoning
Date: Wed, 14 Oct 2020 20:37:09 -0700 [thread overview]
Message-ID: <20201015033712.1491731-1-keescook@chromium.org> (raw)
v3:
- fix commit messages to properly reflect the direction of the overwrite
- justify the less-than-word-size patch better
- add Acks
- move some Fixes up into the commit log as just references
v2: https://lore.kernel.org/lkml/20201009195411.4018141-1-keescook@chromium.org
v1: https://lore.kernel.org/lkml/20201008233443.3335464-1-keescook@chromium.org
This fixes redzoning vs the freelist pointer (both for middle-position
and very small caches). Both are "theoretical" fixes, in that I see no
evidence of such small-sized caches actually be used in the kernel, but
that's no reason to let the bugs continue to exist. :)
Note on patch 2: Christopher NAKed it, but I actually think this is a
reasonable thing to add -- the "too small" check is only made when built
with CONFIG_DEBUG_VM, so it *is* actually possible for someone to trip
over this directly, even if it would never make it into a released
kernel. I see no reason to just leave this foot-gun in place, though, so
we might as well just fix it too. (Which seems to be what Longman was
similarly supporting, IIUC.)
Anyway, if patch 2 stays NAKed, that's fine. It's entirely separable,
and the other 2 can land. :)
Thanks!
-Kees
Kees Cook (3):
mm/slub: Clarify verification reporting
mm/slub: Fix redzoning for small allocations
mm/slub: Actually fix freelist pointer vs redzoning
Documentation/vm/slub.rst | 10 +++++-----
mm/slub.c | 36 +++++++++++++++---------------------
2 files changed, 20 insertions(+), 26 deletions(-)
--
2.25.1
next reply other threads:[~2020-10-15 3:37 UTC|newest]
Thread overview: 7+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-10-15 3:37 Kees Cook [this message]
2020-10-15 3:37 ` [PATCH v3 1/3] mm/slub: Clarify verification reporting Kees Cook
2020-10-15 3:37 ` [PATCH v3 2/3] mm/slub: Fix redzoning for small allocations Kees Cook
2020-10-15 3:37 ` [PATCH v3 3/3] mm/slub: Actually fix freelist pointer vs redzoning Kees Cook
2020-10-15 8:23 ` [PATCH v3 0/3] " Christopher Lameter
2020-10-15 9:44 ` Vlastimil Babka
2020-10-15 22:03 ` Kees Cook
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