linux-hardening - [PATCH 0/5] Add __alloc_size() for better bounds checking

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Date:   Tue, 17 Aug 2021 22:08:36 -0700
From:   Kees Cook <keescook@...omium.org>
To:     linux-kernel@...r.kernel.org
Cc:     Kees Cook <keescook@...omium.org>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Miguel Ojeda <ojeda@...nel.org>,
        Nathan Chancellor <nathan@...nel.org>,
        Nick Desaulniers <ndesaulniers@...gle.com>,
        Daniel Micay <danielmicay@...il.com>,
        Christoph Lameter <cl@...ux.com>,
        Pekka Enberg <penberg@...nel.org>,
        David Rientjes <rientjes@...gle.com>,
        Joonsoo Kim <iamjoonsoo.kim@....com>,
        Vlastimil Babka <vbabka@...e.cz>,
        Dennis Zhou <dennis@...nel.org>, Tejun Heo <tj@...nel.org>,
        Masahiro Yamada <masahiroy@...nel.org>,
        Michal Marek <michal.lkml@...kovi.net>,
        clang-built-linux@...glegroups.com, linux-mm@...ck.org,
        linux-kbuild@...r.kernel.org, linux-hardening@...r.kernel.org
Subject: [PATCH 0/5] Add __alloc_size() for better bounds checking

Hi,

GCC and Clang both use the "alloc_size" attribute to assist with bounds
checking around the use of allocation functions. Add the attribute,
adjust the Makefile to silence needless warnings, and add the hints to
the allocators where possible. These changes have been in use for a
while now in GrapheneOS.

To build without warnings, this series needs a couple small fixes for
allmodconfig, which I sent separately:
https://lore.kernel.org/lkml/20210818044540.1601664-1-keescook@chromium.org/
https://lore.kernel.org/lkml/20210818044252.1533634-1-keescook@chromium.org/
https://lore.kernel.org/lkml/20210818043912.1466447-1-keescook@chromium.org/

I figure I can take this via my "overflow" series, or it could go via
-mm?

-Kees

Kees Cook (5):
  Compiler Attributes: Add __alloc_size() for better bounds checking
  slab: Add __alloc_size attributes for better bounds checking
  mm/page_alloc: Add __alloc_size attributes for better bounds checking
  percpu: Add __alloc_size attributes for better bounds checking
  mm/vmalloc: Add __alloc_size attributes for better bounds checking

 Makefile                            |  6 +++-
 include/linux/compiler_attributes.h |  6 ++++
 include/linux/gfp.h                 |  4 +--
 include/linux/percpu.h              |  6 ++--
 include/linux/slab.h                | 50 ++++++++++++++++++-----------
 include/linux/vmalloc.h             | 22 ++++++-------
 6 files changed, 58 insertions(+), 36 deletions(-)

-- 
2.30.2