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[198.145.64.163]) by smtp.gmail.com with ESMTPSA id f5sm4570524pfn.134.2021.08.17.23.14.12 (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 , Pablo Neira Ayuso , Jozsef Kadlecsik , Florian Westphal , "David S. Miller" , Jakub Kicinski , netfilter-devel@vger.kernel.org, coreteam@netfilter.org, 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 40/63] netfilter: conntrack: Use memset_startat() to zero struct nf_conn Date: Tue, 17 Aug 2021 23:05:10 -0700 Message-Id: <20210818060533.3569517-41-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=1292; h=from:subject; bh=fE+HPCTs14JsaXA0VZ1+azTXm9sRPSgAjXFdw5wZMQo=; b=owEBbQKS/ZANAwAKAYly9N/cbcAmAcsmYgBhHKMn9jUxUjmhnSM6V4Tc0qU7XODXJhF3t5WIJd3Y koV1FpKJAjMEAAEKAB0WIQSlw/aPIp3WD3I+bhOJcvTf3G3AJgUCYRyjJwAKCRCJcvTf3G3AJhk3D/ 9Y7TD9jWlZ06v+vvdPdc8QlSMediOUFC1q3DoYi7bvc4YyEqXGUCbEBONwNQLvsK3hI4ED3PL+2IhD hz/Dbx5DT2T40OMCMycZbUmvAgn6pOBBpw2q5g7L1MPBPiZjTMXq8E4ovppbe62BM08pHEnfAugWsL Vg8PPE0Mpa5a+QOsrBwIXi58FdhL+TgFoZSeBzbJm+KmZX4h++dF5E6mfecc7iWTRI8x9S8/YHdEh9 ZIb37NLdJeVivXFEuz3DfGGLCuGfbSDNomkElBmWe2yPoHWjEkJTWn6RNq+MEAjA9TJ5TJ3HDso1/K sKW9g8e4L1L/rtxaFXF9BV/xpTwz0kRs0XsBqZ+kJVDfducMf0ve5e9o39+ZRvnlGz1cBPnku+/z+w 0bwBKb/ZheH0vYU+K8EWpKneqiHfpTz4StFzfiQRwhbiGP3RgP5fcXs0kJTQd7Pb2ELVtqLcT+gjk9 6GhJhWeDD/p/qHw7tNmVAq61F9fgKxmA+c7cUPkuWqkaozXqUnyya2WLhQ5LvSbSIIu7/NC2yfZ+vB 5nw/neLBHyCcwQZyeBRVjmkcwXCcmWSOAeUgya9iGsWYJAEHUAkIzm1Hk4kcF6HSJmjPw9ayH8RBkV zBGERJvvVpyPFtl03OuHfjGRW4wn6Zs+wzWO0oB8CiPowPcXXUv7O9y+3+xA== 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_startat() to avoid confusing memset() about writing beyond the target struct member. Cc: Pablo Neira Ayuso Cc: Jozsef Kadlecsik Cc: Florian Westphal Cc: "David S. Miller" Cc: Jakub Kicinski Cc: netfilter-devel@vger.kernel.org Cc: coreteam@netfilter.org Cc: netdev@vger.kernel.org Signed-off-by: Kees Cook --- net/netfilter/nf_conntrack_core.c | 4 +--- 1 file changed, 1 insertion(+), 3 deletions(-) diff --git a/net/netfilter/nf_conntrack_core.c b/net/netfilter/nf_conntrack_core.c index d31dbccbe7bd..060503230519 100644 --- a/net/netfilter/nf_conntrack_core.c +++ b/net/netfilter/nf_conntrack_core.c @@ -1500,9 +1500,7 @@ __nf_conntrack_alloc(struct net *net, ct->status = 0; ct->timeout = 0; write_pnet(&ct->ct_net, net); - memset(&ct->__nfct_init_offset, 0, - offsetof(struct nf_conn, proto) - - offsetof(struct nf_conn, __nfct_init_offset)); + memset_after(ct, 0, __nfct_init_offset); nf_ct_zone_add(ct, zone);