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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
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