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[198.145.64.163]) by smtp.gmail.com with ESMTPSA id i24sm3255991pfr.207.2021.07.27.14.06.55 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Tue, 27 Jul 2021 14:07:01 -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 54/64] ipv6: Use struct_group() to zero rt6_info Date: Tue, 27 Jul 2021 13:58:45 -0700 Message-Id: <20210727205855.411487-55-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=2014; h=from:subject; bh=9FxEXENVJNuB45fHUbaxMj4hb424u+KXBOvcDXadQUU=; b=owEBbQKS/ZANAwAKAYly9N/cbcAmAcsmYgBhAHOMr1s7rjBnwnV0YvEmCppP2KjiI7qwbNhC0tnR LR54sH2JAjMEAAEKAB0WIQSlw/aPIp3WD3I+bhOJcvTf3G3AJgUCYQBzjAAKCRCJcvTf3G3AJvB1D/ 9HyBVTCMQFZVnce4Q7z9RSSZaLEhmwSMwOLxk45KjDsJAOP3HcDjbkcb2t+AmQxHosaQzMYzJBsPLM fI6MGo8d7iglJul2X+wgatbPcEehYNvmi9N2hSNViixrkSMFXRYD9gNgZxmurHn3poTaQBFJeH/CMt i0K0Mf9xJLh09ZTUaBEMkeBp92msj4wB0UzT2YgQVbRBg/2h2H9tSdBS7ou3xC8W1K4gsOB+p8y9Z9 E6xK8yOM9010RaqlQJ7Xwiw/qBjEzM4v6/BvFKOfF7nbprnDsEcm1n3uqkj3PJ0XdUXpvHAc5ObsoB KO/0wpq+dvC4caLYvsafIZqOaz3hLgcDlRNbqQtK2sC08guGWc1MHoTfZoyOpPcsvKpv6Ez1ugjb2i pyJ0WkxY6xI4NtO334xyOlpSXADvHv+yqhiucaHger+9V1z3cVGZWQJMnpNFHTjqetSkyOaPhGCfT6 eygtBdkni37ipeLcPOAVtXgZH4iuKxdilblIEAG1YqFqpciOhCgtYiCt3itR4hpyhJp61nLn2XSysU lMIbYdUyBQlmwsWY79F0ezh83tePY6wggdyAujypUrGKiYTgTpH817kU7KBH2AB7YhuYQevj9FEHhD B/H1yY45d73/j38Hw4+briFVcL4khdU1nni0efnXIAMBNb0nJPEsOcf21O/g== X-Developer-Key: i=keescook@chromium.org; a=openpgp; fpr=A5C3F68F229DD60F723E6E138972F4DFDC6DC026 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. Add struct_group() to mark region of struct rt6_info that should be initialized to zero. Signed-off-by: Kees Cook --- include/net/ip6_fib.h | 30 ++++++++++++++++-------------- net/ipv6/route.c | 4 +--- 2 files changed, 17 insertions(+), 17 deletions(-) diff --git a/include/net/ip6_fib.h b/include/net/ip6_fib.h index 15b7fbe6b15c..9816e7444918 100644 --- a/include/net/ip6_fib.h +++ b/include/net/ip6_fib.h @@ -205,20 +205,22 @@ struct fib6_info { struct rt6_info { struct dst_entry dst; - struct fib6_info __rcu *from; - int sernum; - - struct rt6key rt6i_dst; - struct rt6key rt6i_src; - struct in6_addr rt6i_gateway; - struct inet6_dev *rt6i_idev; - u32 rt6i_flags; - - struct list_head rt6i_uncached; - struct uncached_list *rt6i_uncached_list; - - /* more non-fragment space at head required */ - unsigned short rt6i_nfheader_len; + struct_group(init, + struct fib6_info __rcu *from; + int sernum; + + struct rt6key rt6i_dst; + struct rt6key rt6i_src; + struct in6_addr rt6i_gateway; + struct inet6_dev *rt6i_idev; + u32 rt6i_flags; + + struct list_head rt6i_uncached; + struct uncached_list *rt6i_uncached_list; + + /* more non-fragment space at head required */ + unsigned short rt6i_nfheader_len; + ); }; struct fib6_result { diff --git a/net/ipv6/route.c b/net/ipv6/route.c index 6b8051106aba..bbcc605bab57 100644 --- a/net/ipv6/route.c +++ b/net/ipv6/route.c @@ -327,9 +327,7 @@ static const struct rt6_info ip6_blk_hole_entry_template = { static void rt6_info_init(struct rt6_info *rt) { - struct dst_entry *dst = &rt->dst; - - memset(dst + 1, 0, sizeof(*rt) - sizeof(*dst)); + memset(&rt->init, 0, sizeof(rt->init)); INIT_LIST_HEAD(&rt->rt6i_uncached); }