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Date:   Mon, 20 Sep 2021 11:08:51 -0700
From:   Kees Cook <>
To:     Rasmus Villemoes <>
Cc:     Kees Cook <>,
        "Gustavo A. R. Silva" <>,
        Nathan Chancellor <>,
        Jason Gunthorpe <>,
        Nick Desaulniers <>,
        Leon Romanovsky <>,
        Keith Busch <>, Len Baker <>,,
Subject: [PATCH 0/2] overflow: Implement size_t saturating arithmetic helpers


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.




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(-)


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