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[198.145.64.163]) by smtp.gmail.com with ESMTPSA id q14sm4721670pfn.73.2021.07.27.14.06.50 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Tue, 27 Jul 2021 14:06:50 -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 55/64] RDMA/mlx5: Use struct_group() to zero struct mlx5_ib_mr Date: Tue, 27 Jul 2021 13:58:46 -0700 Message-Id: <20210727205855.411487-56-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=1274; h=from:subject; bh=oY909dEANo6V3IFn0noc67FV5hBK8uceU7oGCjc7zOw=; b=owEBbQKS/ZANAwAKAYly9N/cbcAmAcsmYgBhAHOMh317iG5OLcRV6f6KOkZ9q+C2N36hwkRl8LQQ C7eGawSJAjMEAAEKAB0WIQSlw/aPIp3WD3I+bhOJcvTf3G3AJgUCYQBzjAAKCRCJcvTf3G3AJg4UD/ 9BnzAT1Z7CsW+TRX8tpO/bHWsp1ALKoQrreRJNLcuwaofCAjFi8BnU29qFDffCG8DWqAC3Pmtj4p39 RskVkYUAy5axxifQzhefjhk7tLjvkw2mmeV+0QGdeg2rbLL5Dpmmav2A7WaFsWyg7W74/0ud+a6Hbc M4RLDpYX0mM68jox12+Syr653lTWFNFS86gcN1Q975/PUD2xYk3dY3H3s2zF7i9XFyEP2N2G5zErPl ED8ZrAbuSSNxMO5rke2YVbiw/FbKveB5UCkCgtjoT7lSW9mZYdr144xmSl8iaDmr3LYdfAxQG6WpF1 N2W+2K9FRkZT0VZd9PdKAMbV3Ofm9qyfYEnpmGGs0y4uhKJtYKpv60s7YXeG+eQtwR/bCFvecfShz5 rvqvYF46IrMS8jbLeJHjqvjyd1hw+zCAJKd2c4R2LPUZ7WDVjRNGtq82PEZ2Tr725JvJTSLKrGx8YA tWmn4rCBBSu/PqTl3206VAZLiP+HeqZxC26TE27C7IcR67ONOX3U06CdJRm2X3VkQMJVPvT0OYPmRr DH5V/sNlfiZe0r9fNcKAYsCQaHKXs6D2jYAWqxqm2msNETdd60wrVAfUL77zKIV9hqqj6sRIXPhZ8R +len0ulP7Zp0NQRxZYGLikaPmhWeDXiQR88kCVUq6p0rdBPBuFSFYAGLjJSQ== 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 In preparation for FORTIFY_SOURCE performing compile-time and run-time field bounds checking for memset(), avoid intentionally writing across neighboring fields. Add struct_group() to mark region of struct mlx5_ib_mr that should be initialized to zero. Signed-off-by: Kees Cook --- drivers/infiniband/hw/mlx5/mlx5_ib.h | 4 +++- 1 file changed, 3 insertions(+), 1 deletion(-) diff --git a/drivers/infiniband/hw/mlx5/mlx5_ib.h b/drivers/infiniband/hw/mlx5/mlx5_ib.h index 585fb00bdce8..830066e95260 100644 --- a/drivers/infiniband/hw/mlx5/mlx5_ib.h +++ b/drivers/infiniband/hw/mlx5/mlx5_ib.h @@ -644,6 +644,7 @@ struct mlx5_ib_mr { struct ib_umem *umem; /* This is zero'd when the MR is allocated */ + struct_group(cleared, union { /* Used only while the MR is in the cache */ struct { @@ -691,12 +692,13 @@ struct mlx5_ib_mr { bool is_odp_implicit; }; }; + ); }; /* Zero the fields in the mr that are variant depending on usage */ static inline void mlx5_clear_mr(struct mlx5_ib_mr *mr) { - memset(mr->out, 0, sizeof(*mr) - offsetof(struct mlx5_ib_mr, out)); + memset(&mr->cleared, 0, sizeof(mr->cleared)); } static inline bool is_odp_mr(struct mlx5_ib_mr *mr) -- 2.30.2