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

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Date:   Mon, 20 Sep 2021 11:08:51 -0700
From:   Kees Cook <keescook@...omium.org>
To:     Rasmus Villemoes <linux@...musvillemoes.dk>
Cc:     Kees Cook <keescook@...omium.org>,
        "Gustavo A. R. Silva" <gustavoars@...nel.org>,
        Nathan Chancellor <nathan@...nel.org>,
        Jason Gunthorpe <jgg@...pe.ca>,
        Nick Desaulniers <ndesaulniers@...gle.com>,
        Leon Romanovsky <leon@...nel.org>,
        Keith Busch <kbusch@...nel.org>, Len Baker <len.baker@....com>,
        linux-kernel@...r.kernel.org, linux-hardening@...r.kernel.org
Subject: [PATCH 0/2] overflow: Implement size_t saturating arithmetic helpers

Hi,

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

Thanks,

-Kees

[1] https://lore.kernel.org/lkml/?q=%22open-coded+arithmetic%22

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

 include/linux/overflow.h | 140 ++++++++++++++++++++++++---------------
 lib/test_overflow.c      | 111 ++++++++++++++++++++++++-------
 2 files changed, 175 insertions(+), 76 deletions(-)

-- 
2.30.2