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[198.145.64.163]) by smtp.gmail.com with ESMTPSA id g3sm133895pjm.22.2021.09.20.11.08.55 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Mon, 20 Sep 2021 11:08:55 -0700 (PDT) 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 , 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 Message-Id: <20210920180853.1825195-1-keescook@chromium.org> X-Mailer: git-send-email 2.30.2 MIME-Version: 1.0 X-Developer-Signature: v=1; a=openpgp-sha256; l=685; h=from:subject; bh=FeG5PlfVQOLm7yYHENWE55wzEyBQPrLEryzPdosJgs4=; b=owEBbQKS/ZANAwAKAYly9N/cbcAmAcsmYgBhSM402j4bi/2udxuIImKCgmvR1/RMVmE5NfB0uQe9 ov29NnCJAjMEAAEKAB0WIQSlw/aPIp3WD3I+bhOJcvTf3G3AJgUCYUjONAAKCRCJcvTf3G3AJkCqD/ 9wne1Eptj0PIivZbRY8lVn4JyDC7UhAQr4gHCOyvPKbQ8YuHJZwKGwTftmmeOU9iR4vmLtg729JALP OGU249kFWYyRLcDTQYhN8IDTZAFOuWr49twoJAkugw0Oh1T+OQX64DMHeLxaqhNQVhEpmDVtfSuLIp Z6350Ufx3WfpKutOlwTN/snYSetedt/sXo7ebW3IEQQ3KjgraTlhQF2IlUvYnMpxx7NJLMdG66wSwD Od2hMQw/XKGRmRh3fJpRptzhA/oUGkKiGKFrFxyReQ9BdUacnYOLO8MLncsQ4DTRO7lVeFt42hgwQ5 PUtsstbbVYlGZ3RKmUj973T8/9+WDXs2je27S3nut+/uu/vY2d+Ehww1WhMUnmj0qoOQlGOTCKIWHI WxMQ0oMaKpBWIDjiHg4snsjgLxIC0RSwvNfnTmt8Blr/krbwZcRyoP3k/RWUI1JqEnuAmWI+cJ7NBq dFu7S4MC0718Q+hS2WQMaKFACmrH3HQT2mbvh1H5t6q518HbWEsFf4vbEUb7EbH1D31KG/DifLRjh9 KJLFUFHnumgao8bYjXwynF9v8tdUXDfXXNY2QIDWKhWYRVfqO2cMZOoxfpVsstai+aMRERT/7kzkMq KayOgWm9jy+bO7UvQv5WXgR17VZZT6XNxvVCZ++hQYmwJ7S+w25PbZBhywAw== X-Developer-Key: i=keescook@chromium.org; a=openpgp; fpr=A5C3F68F229DD60F723E6E138972F4DFDC6DC026 Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: linux-hardening@vger.kernel.org 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