linux-kernel - [PATCH v2 0/2] overflow: Implement size

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Date:   Mon, 24 Jan 2022 15:23:40 -0800
From:   Kees Cook <keescook@...omium.org>
To:     Rasmus Villemoes <linux@...musvillemoes.dk>
Cc:     Kees Cook <keescook@...omium.org>,
        Nick Desaulniers <ndesaulniers@...gle.com>,
        "Gustavo A. R. Silva" <gustavoars@...nel.org>,
        Nathan Chancellor <nathan@...nel.org>,
        Jason Gunthorpe <jgg@...pe.ca>,
        Leon Romanovsky <leon@...nel.org>,
        Keith Busch <kbusch@...nel.org>, Len Baker <len.baker@....com>,
        Jonathan Corbet <corbet@....net>, linux-kernel@...r.kernel.org,
        linux-doc@...r.kernel.org, linux-hardening@...r.kernel.org
Subject: [PATCH v2 0/2] overflow: Implement size_t saturating arithmetic helpers

Hi,

While doing more array_size() scans on the kernel, and reviewing recent[1]
struct_size() work[2], it became clear we needed helpers to perform
composed saturating adds and multiplies. This creates those helpers and
updates the self tests to check them.

v1: https://lore.kernel.org/lkml/20210920180853.1825195-1-keescook@chromium.org/
v2:
 - use static inlines instead of macros (Rasmus)
 - undef local helpers defs in selftest (Rasmus)
 - Make sure to keep saturation for size_sub() arguments
 - update selftests for size_sub() behavior
 - Add reviews

Thanks,

-Kees

[1] https://lore.kernel.org/linux-hardening/202201241213.82E7D9F598@keescook/
[2] https://lore.kernel.org/lkml/?q=%22open-coded+arithmetic%22

Kees Cook (2):
  test_overflow: Regularize test reporting output
  overflow: Implement size_t saturating arithmetic helpers

 Documentation/process/deprecated.rst |  20 +++-
 include/linux/overflow.h             | 110 +++++++++++--------
 lib/test_overflow.c                  | 152 ++++++++++++++++++++++-----
 3 files changed, 214 insertions(+), 68 deletions(-)

-- 
2.30.2