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From: Kees Cook <keescook@chromium.org>
To: Rasmus Villemoes <linux@rasmusvillemoes.dk>
Cc: Kees Cook <keescook@chromium.org>,
	Nick Desaulniers <ndesaulniers@google.com>,
	"Gustavo A. R. Silva" <gustavoars@kernel.org>,
	Nathan Chancellor <nathan@kernel.org>,
	Jason Gunthorpe <jgg@ziepe.ca>, Leon Romanovsky <leon@kernel.org>,
	Keith Busch <kbusch@kernel.org>, Len Baker <len.baker@gmx.com>,
	Jonathan Corbet <corbet@lwn.net>,
	linux-kernel@vger.kernel.org, linux-doc@vger.kernel.org,
	linux-hardening@vger.kernel.org
Subject: [PATCH v2 0/2] overflow: Implement size_t saturating arithmetic helpers
Date: Mon, 24 Jan 2022 15:23:40 -0800	[thread overview]
Message-ID: <20220124232342.3113350-1-keescook@chromium.org> (raw)

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


             reply	other threads:[~2022-01-25  3:54 UTC|newest]

Thread overview: 3+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2022-01-24 23:23 Kees Cook [this message]
2022-01-24 23:23 ` [PATCH v2 1/2] test_overflow: Regularize test reporting output Kees Cook
2022-01-24 23:23 ` [PATCH v2 2/2] overflow: Implement size_t saturating arithmetic helpers Kees Cook

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