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[198.145.64.163]) by smtp.gmail.com with ESMTPSA id q19sm5028194pgj.17.2021.07.27.14.16.53 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Tue, 27 Jul 2021 14:16:54 -0700 (PDT) From: Kees Cook To: linux-hardening@vger.kernel.org Cc: Kees Cook , "Gustavo A. R. Silva" , Keith Packard , Greg Kroah-Hartman , Andrew Morton , linux-kernel@vger.kernel.org, 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 Subject: [PATCH 46/64] IB/mthca: Use memset_after() for clearing mpt_entry Date: Tue, 27 Jul 2021 13:58:37 -0700 Message-Id: <20210727205855.411487-47-keescook@chromium.org> X-Mailer: git-send-email 2.30.2 In-Reply-To: <20210727205855.411487-1-keescook@chromium.org> References: <20210727205855.411487-1-keescook@chromium.org> MIME-Version: 1.0 X-Developer-Signature: v=1; a=openpgp-sha256; l=1125; h=from:subject; bh=EIIm+0VdwQ9IH2XMV6ts5pIWwaxyRwboIG5815tF7+o=; b=owEBbQKS/ZANAwAKAYly9N/cbcAmAcsmYgBhAHOKarr4bIPgvwWH2qKkwLe6/q8cDAlBzD3bLA24 ll85FGeJAjMEAAEKAB0WIQSlw/aPIp3WD3I+bhOJcvTf3G3AJgUCYQBzigAKCRCJcvTf3G3AJvwwEA ChEYdVEvOlY6ZSSDwSK+GqTMcoJtHYXIXerlg3cv7Z5B/nj+4tsVkjpbbg6qYJ7G6Wn5LCRzlLTF/B JEQNK1K018MnLFUCnQdrWeHhqOML4Z+QY9330qvih8kbryLwUmmPm8tMDr8k7xeqODqXV0ysJUPb2N xVAh/ldKgMIWN0SIEK4b/AeC9lC2gYUHs0M9ufsvUwE/w7u4/dJRXGEtfOnpjbz9EiJRevDyOxG/L7 5kQTjyY65fkZSD9d3DQYA0of/YGF5vIAzSb90hB4BR+6elYWhMJodLf6s9scmQdVrWhXQ4dVg6J+8M ycSHtAUfvV0kejqMCcI904M9g4jJuniybmlBLuzSIsi21ELju85L/7B9KiYaqlPgChXogQSPXNk5Kd 54beIYuu1Fd49rYR1R8WtEoklJaIrmJSkYaEDaYgFR3e7sXiui1Lo6/7QEjLjklWuNupXgY7d+KgBw oCFrVzGvwPnUGDQnGEfR2OxN6HzTznt5SuyVEVOZkOSmgu5uS6ad9csIugS5srvBjmEQQuXMfiCcAe FRY7ypPn9oUPWMah/ykVuPdD7cmvKT/OghOEHP/qza9WeqolkQBPyj4t9m6qBq2lsFMVjj3xVeXXM2 +eC9JXnzHZx87wkFYpcVJstfzhif8T3qljrVvmM3fY2NknXhqRg98uBOWpsQ== 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. Use memset_after() 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. Signed-off-by: Kees Cook --- drivers/infiniband/hw/mthca/mthca_mr.c | 3 +-- 1 file changed, 1 insertion(+), 2 deletions(-) diff --git a/drivers/infiniband/hw/mthca/mthca_mr.c b/drivers/infiniband/hw/mthca/mthca_mr.c index ce0e0867e488..64adba5c067d 100644 --- a/drivers/infiniband/hw/mthca/mthca_mr.c +++ b/drivers/infiniband/hw/mthca/mthca_mr.c @@ -469,8 +469,7 @@ int mthca_mr_alloc(struct mthca_dev *dev, u32 pd, int buffer_size_shift, mpt_entry->start = cpu_to_be64(iova); mpt_entry->length = cpu_to_be64(total_size); - memset(&mpt_entry->lkey, 0, - sizeof *mpt_entry - offsetof(struct mthca_mpt_entry, lkey)); + memset_after(mpt_entry, 0, length); if (mr->mtt) mpt_entry->mtt_seg =