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[198.145.64.163]) by smtp.gmail.com with ESMTPSA id l12sm5631661pgc.41.2021.08.17.23.14.12 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Tue, 17 Aug 2021 23:14:12 -0700 (PDT) From: Kees Cook To: linux-kernel@vger.kernel.org Cc: Kees Cook , Benjamin Herrenschmidt , Qinglang Miao , "Gustavo A. R. Silva" , Hulk Robot , Wang Wensheng , linuxppc-dev@lists.ozlabs.org, Michael Ellerman , Greg Kroah-Hartman , Andrew Morton , linux-wireless@vger.kernel.org, netdev@vger.kernel.org, dri-devel@lists.freedesktop.org, linux-staging@lists.linux.dev, linux-block@vger.kernel.org, linux-kbuild@vger.kernel.org, clang-built-linux@googlegroups.com, Rasmus Villemoes , linux-hardening@vger.kernel.org Subject: [PATCH v2 61/63] powerpc: Split memset() to avoid multi-field overflow Date: Tue, 17 Aug 2021 23:05:31 -0700 Message-Id: <20210818060533.3569517-62-keescook@chromium.org> X-Mailer: git-send-email 2.30.2 In-Reply-To: <20210818060533.3569517-1-keescook@chromium.org> References: <20210818060533.3569517-1-keescook@chromium.org> MIME-Version: 1.0 X-Developer-Signature: v=1; a=openpgp-sha256; l=1360; h=from:subject; bh=JCECg/Hewr4d9JO4WQR5kDd0IjByC1o9V4GNPJaYPKM=; b=owEBbQKS/ZANAwAKAYly9N/cbcAmAcsmYgBhHKMrEHk87hiQVCzgI18EL/HOEsDc4MJhIkHkaVTZ DZKWkUOJAjMEAAEKAB0WIQSlw/aPIp3WD3I+bhOJcvTf3G3AJgUCYRyjKwAKCRCJcvTf3G3AJjKnD/ 9vO5rK1NcyiJFD1V1xX5Q3QwJPN1EMRWYcJsr5dTRrhYDef2VBoAd3vGVJhv5tPWCziVR95zI+LgIL d02IU4Ow0Hf/RnPFBOD9Lk1pR4bdZqy2udFH1tE06S0wBxz6HBgDxKiHg0hd49XAZs+xsJCSVXM+ks ZJe+gXBJkwU0QQlyx97a3srOeF6TBCIwRbfsc1ny8kqeq7rHXhuez2Nl/jEpDrSY7P6MGZ0RS9pwGp BG8XE5jwyatTqBbwztRYJO6EDxF1oljeN+vw6wXSMzHTs0P0jZF+xhBsDePue4SrU1uYVK4eI314VF ytJTqzumiq1LoMoetRo7XbnZL9HC+8KQkD7iex+cbwbl0vBuTQNERQCXbWiuHcR7WbrVndhdzqr/qr 7kpYWqqHhGYN42VOTCoEV+CxxyGt6O1oEwupEs9JwlhAHT0ET/3m5v95ln9sj4q/idsJQyugW9w9wS B+pdNyiwZvnrIR6r8PjnSHwflJuJYyRkP28Ci+HZxNLOE9WlE6UmnuDmdrcVKpWz+nctnlPQ9JHhAq vpfGhXMnm0qF1zx5IYh+d69+ZRtUQbUKz2k4hFKSxvSse3CvWfi63pBT3m1O556umLnQD6zZbq4vQZ p0vLhJOR+anh57gwE1CG5ilwh9jU07xLpPrNzUQkHrIgJsiMsfqPJrC73E9g== X-Developer-Key: i=keescook@chromium.org; a=openpgp; fpr=A5C3F68F229DD60F723E6E138972F4DFDC6DC026 Precedence: bulk List-ID: X-Mailing-List: netdev@vger.kernel.org In preparation for FORTIFY_SOURCE performing compile-time and run-time field bounds checking for memset(), avoid intentionally writing across neighboring fields. Instead of writing across a field boundary with memset(), move the call to just the array, and an explicit zeroing of the prior field. Cc: Benjamin Herrenschmidt Cc: Qinglang Miao Cc: "Gustavo A. R. Silva" Cc: Hulk Robot Cc: Wang Wensheng Cc: linuxppc-dev@lists.ozlabs.org Signed-off-by: Kees Cook Reviewed-by: Michael Ellerman Link: https://lore.kernel.org/lkml/87czqsnmw9.fsf@mpe.ellerman.id.au --- drivers/macintosh/smu.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) diff --git a/drivers/macintosh/smu.c b/drivers/macintosh/smu.c index 94fb63a7b357..59ce431da7ef 100644 --- a/drivers/macintosh/smu.c +++ b/drivers/macintosh/smu.c @@ -848,7 +848,8 @@ int smu_queue_i2c(struct smu_i2c_cmd *cmd) cmd->read = cmd->info.devaddr & 0x01; switch(cmd->info.type) { case SMU_I2C_TRANSFER_SIMPLE: - memset(&cmd->info.sublen, 0, 4); + cmd->info.sublen = 0; + memset(&cmd->info.subaddr, 0, 3); break; case SMU_I2C_TRANSFER_COMBINED: cmd->info.devaddr &= 0xfe;