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From: Kees Cook <keescook@chromium.org>
To: Rasmus Villemoes <linux@rasmusvillemoes.dk>
Cc: Kees Cook <keescook@chromium.org>,
	"Gustavo A. R. Silva" <gustavoars@kernel.org>,
	Nathan Chancellor <nathan@kernel.org>,
	Jason Gunthorpe <jgg@ziepe.ca>,
	Nick Desaulniers <ndesaulniers@google.com>,
	Leon Romanovsky <leon@kernel.org>,
	Keith Busch <kbusch@kernel.org>, Len Baker <len.baker@gmx.com>,
	linux-kernel@vger.kernel.org, linux-hardening@vger.kernel.org
Subject: [PATCH 0/2] overflow: Implement size_t saturating arithmetic helpers
Date: Mon, 20 Sep 2021 11:08:51 -0700	[thread overview]
Message-ID: <20210920180853.1825195-1-keescook@chromium.org> (raw)

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


             reply	other threads:[~2021-09-21  1:33 UTC|newest]

Thread overview: 12+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-09-20 18:08 Kees Cook [this message]
2021-09-20 18:08 ` [PATCH 1/2] overflow: Implement size_t saturating arithmetic helpers Kees Cook
2021-09-20 22:06   ` Nick Desaulniers
2021-09-21  1:38     ` Kees Cook
2021-09-21  6:51   ` Rasmus Villemoes
2021-09-21 19:07     ` Kees Cook
2022-01-24 21:13     ` Kees Cook
2022-01-24 21:16       ` Nick Desaulniers
2022-01-25 12:58       ` Jason Gunthorpe
2021-09-20 18:08 ` [PATCH 2/2] test_overflow: Regularize test reporting output Kees Cook
2021-09-20 22:10   ` Nick Desaulniers
2021-09-21  6:56     ` Rasmus Villemoes

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