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[198.145.64.163]) by smtp.gmail.com with ESMTPSA id h17sm4603571pfh.192.2021.08.17.23.14.14 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Tue, 17 Aug 2021 23:14:15 -0700 (PDT) From: Kees Cook To: linux-kernel@vger.kernel.org Cc: Kees Cook , Jes Sorensen , "David S. Miller" , Jakub Kicinski , linux-hippi@sunsite.dk, netdev@vger.kernel.org, "Gustavo A. R. Silva" , Greg Kroah-Hartman , Andrew Morton , linux-wireless@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 41/63] net: 802: Use memset_startat() to clear struct fields Date: Tue, 17 Aug 2021 23:05:11 -0700 Message-Id: <20210818060533.3569517-42-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=1181; h=from:subject; bh=C+6KD7t/6fG5hDgRQb4fosYJ4WHPortotbK235WcI2o=; b=owEBbQKS/ZANAwAKAYly9N/cbcAmAcsmYgBhHKMn5oDen6ROCRtoOkoprqxOZyis1cM1QgeAkzRs Z+Yu9WKJAjMEAAEKAB0WIQSlw/aPIp3WD3I+bhOJcvTf3G3AJgUCYRyjJwAKCRCJcvTf3G3AJoehD/ 9r6K6SUsL5lVEdFegLY8K/qjemzJ8Qx2dDCwnIGOnbcI770wVd2gUkq+8bMIiGTpuHm8KLfXED/VPo XEYrAiSzdYDynkSQ5uT93DAcDJecWMvkl5cUZenRJ9e335MwzPk46WbpMY5lsvDG4LBrEYQUe3GB15 fZ8nYwjw5Q+FqdH31kVwt/2NSANrGxWmVtnNghwDYLKm0CqhmEc4kK70cmiOpl45EDBUWHjcVcHhtk +PEcSI8yUja1AxKpyhVTXYsFHlVN/kEk65BL8+8npbvCk63MR9WStzKhTbrb23jLFEg5yu8WATqERe o8xICyKNkMqYX8hCFs5pnjdeEKWUc2/FYepf6KI7RGfKkvKyE2n/BKKsZFKeZ181uCBiO/JcP0Pipn OHApybTpw2p4YCgPfp4IRYVXIyQaygaAotgvJzqZQbLI8E7vsFhH+rcgXzUijzLTAFpUblDhEwLI6b cBzYe+DkWVZ6Glc4eJvXZCjr/W7SxC+nlNR+56QP4XtDM7sC1Yi5QeYqjWqQLKsSmiJ1twc3nx9dtJ qai0woqnGDGFUMcP9v95DEMFbrsh44dGCjOIVocZ3STFgPzYzmTzvVvmCwlMPH+NaZaZZI/NgHQYpw aSEEIjABnuJlCZR3/gTlppRk49XP0ANcu3hytZpYQh0SZTdqnExuxHJTAJ6g== X-Developer-Key: i=keescook@chromium.org; a=openpgp; fpr=A5C3F68F229DD60F723E6E138972F4DFDC6DC026 Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: linux-block@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. Use memset_startat() so memset() doesn't get confused about writing beyond the destination member that is intended to be the starting point of zeroing through the end of the struct. Cc: Jes Sorensen Cc: "David S. Miller" Cc: Jakub Kicinski Cc: linux-hippi@sunsite.dk Cc: netdev@vger.kernel.org Signed-off-by: Kees Cook --- net/802/hippi.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/net/802/hippi.c b/net/802/hippi.c index f80b33a8f7e0..6f71ffc8bdd1 100644 --- a/net/802/hippi.c +++ b/net/802/hippi.c @@ -65,7 +65,7 @@ static int hippi_header(struct sk_buff *skb, struct net_device *dev, hip->le.src_addr_type = 2; /* 12 bit SC address */ memcpy(hip->le.src_switch_addr, dev->dev_addr + 3, 3); - memset(&hip->le.reserved, 0, 16); + memset_startat(&hip->le, 0, reserved); hip->snap.dsap = HIPPI_EXTENDED_SAP; hip->snap.ssap = HIPPI_EXTENDED_SAP; -- 2.30.2