linux-kernel - [PATCH v4 0/3] Actually fix freelist pointer vs redzoning

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Message-Id: <20210608183955.280836-1-keescook@chromium.org>
Date:   Tue,  8 Jun 2021 11:39:52 -0700
From:   Kees Cook <keescook@...omium.org>
To:     Andrew Morton <akpm@...ux-foundation.org>
Cc:     Kees Cook <keescook@...omium.org>,
        Vlastimil Babka <vbabka@...e.cz>,
        Marco Elver <elver@...gle.com>,
        Christoph Lameter <cl@...ux.com>,
        "Lin, Zhenpeng" <zplin@....edu>, Pekka Enberg <penberg@...nel.org>,
        David Rientjes <rientjes@...gle.com>,
        Joonsoo Kim <iamjoonsoo.kim@....com>,
        Roman Gushchin <guro@...com>, linux-kernel@...r.kernel.org,
        linux-doc@...r.kernel.org, linux-mm@...ck.org
Subject: [PATCH v4 0/3] Actually fix freelist pointer vs redzoning

v4:
- remove redundant size check
v3: https://lore.kernel.org/lkml/20201015033712.1491731-1-keescook@chromium.org
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, especially since
people doing local development keep tripping over it. :)

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/slab_common.c          |  3 +--
 mm/slub.c                 | 36 +++++++++++++++---------------------
 3 files changed, 21 insertions(+), 28 deletions(-)

-- 
2.25.1