linux-kernel - [PATCH 0/3] mm/slab: Improved sanity checking

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Date:   Wed, 29 May 2019 21:50:14 -0700
From:   Kees Cook <keescook@...omium.org>
To:     Andrew Morton <akpm@...ux-foundation.org>
Cc:     Kees Cook <keescook@...omium.org>,
        Matthew Wilcox <willy@...radead.org>,
        Alexander Popov <alex.popov@...ux.com>,
        Alexander Potapenko <glider@...gle.com>,
        Christoph Lameter <cl@...ux.com>,
        Pekka Enberg <penberg@...nel.org>,
        David Rientjes <rientjes@...gle.com>,
        Joonsoo Kim <iamjoonsoo.kim@....com>,
        linux-kernel@...r.kernel.org, linux-mm@...ck.org
Subject: [PATCH 0/3] mm/slab: Improved sanity checking

Hi,

This adds defenses against slab cache confusion (as seen in real-world
exploits[1]) and gracefully handles type confusions when trying to look
up slab caches from an arbitrary page. (Also is patch 3: new LKDTM tests
for these defenses as well as for the existing double-free detection. To
avoid possible merge conflicts, I'd prefer patch 3 went via drivers/misc,
which I will send to Greg separately, but I've included it here to help
illustrate the issues.)

-Kees

[1] https://github.com/ThomasKing2014/slides/raw/master/Building%20universal%20Android%20rooting%20with%20a%20type%20confusion%20vulnerability.pdf

Kees Cook (3):
  mm/slab: Validate cache membership under freelist hardening
  mm/slab: Sanity-check page type when looking up cache
  lkdtm/heap: Add tests for freelist hardening

 drivers/misc/lkdtm/core.c  |  5 +++
 drivers/misc/lkdtm/heap.c  | 72 ++++++++++++++++++++++++++++++++++++++
 drivers/misc/lkdtm/lkdtm.h |  5 +++
 mm/slab.c                  | 14 ++++----
 mm/slab.h                  | 29 +++++++++------
 5 files changed, 107 insertions(+), 18 deletions(-)

-- 
2.17.1