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[198.145.64.163]) by smtp.gmail.com with ESMTPSA id r18sm5038817pgk.54.2021.07.27.14.06.52 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Tue, 27 Jul 2021 14:06:54 -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 41/64] net: dccp: Use memset_after() for TP zeroing Date: Tue, 27 Jul 2021 13:58:32 -0700 Message-Id: <20210727205855.411487-42-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=950; h=from:subject; bh=setFCuudESAmPvU7TENmlV2MS4FRl7JRml2jjTFJDIg=; b=owEBbQKS/ZANAwAKAYly9N/cbcAmAcsmYgBhAHOJKZ5loXhOKkjkBoj4absMkEGlM+ZkGAgDZtTY /isiJOGJAjMEAAEKAB0WIQSlw/aPIp3WD3I+bhOJcvTf3G3AJgUCYQBziQAKCRCJcvTf3G3AJl2GEA CkmbILRtScVKazMb1tWpR5Wl/pQ4wUktuV62qIpYEEpFPkHrnESIQz1ChkzSepdcASTNc4T6oa0NP9 WsXo723hzRQElBcUpAdaEQZWe/aRzQgxz6NuJ0ucec44ap26fdlOUq5jkNdSul5xj992thaeMiUWHl M4YJzdgCpzk8OEKhzLzvrViKkK+IaPDmTMBwHh7u5gjX9tk2OqSPx/ZXot6tYvhFg6/Oy0vv+xHrlp iovAgyyLvDPGPpUEgGj2aKBFXc/d/xxdCSuI3b1elrnHoEBod1sM3BVLd8BTraljZmNAi7wrINJzHM eu2aKaVwpvUJwWQr2BuBBRGeV74y1K8w+/Tvp0fufvz6558D1uGi5jCrDj5V4/Nj5+HrvI6IbWlYbY NSCPJB6kzUX1DRdtcu/6/wMtBFe02I7zLytHfwOcQVNqWqm6EA+YewjYVECp7lCvhT+po+Tp2LcZA6 YKyyOzP6+CTDLOyriNbgoebelLFhlWWOSb9rZGEBhs9FxI4qFJJAxmatGkCcUH0MYAz6v5PPfjvR86 yjrrxYWYwC6cjmhctqIhpAdMEd0GZec2ed3KYFABa9OyGSC8Ezex48JITcr9RBnKCdqux3UCJodziE nhi84Hw40jD0Ho9czi4juaFwDxA2xtuq+zKB1K159GTFsJfOh3CFAYS1xoow== X-Developer-Key: i=keescook@chromium.org; a=openpgp; fpr=A5C3F68F229DD60F723E6E138972F4DFDC6DC026 Content-Transfer-Encoding: 8bit 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 --- net/dccp/trace.h | 4 +--- 1 file changed, 1 insertion(+), 3 deletions(-) diff --git a/net/dccp/trace.h b/net/dccp/trace.h index 5062421beee9..3c2594da49fc 100644 --- a/net/dccp/trace.h +++ b/net/dccp/trace.h @@ -60,9 +60,7 @@ TRACE_EVENT(dccp_probe, __entry->tx_t_ipi = hc->tx_t_ipi; } else { __entry->tx_s = 0; - memset(&__entry->tx_rtt, 0, (void *)&__entry->tx_t_ipi - - (void *)&__entry->tx_rtt + - sizeof(__entry->tx_t_ipi)); + memset_after(__entry, 0, tx_s); } ), -- 2.30.2