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[198.145.64.163]) by smtp.gmail.com with ESMTPSA id v20sm5270585pgi.39.2021.08.17.23.14.15 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Tue, 17 Aug 2021 23:14:19 -0700 (PDT) From: Kees Cook To: linux-kernel@vger.kernel.org Cc: Kees Cook , "David S. Miller" , Hideaki YOSHIFUJI , David Ahern , Jakub Kicinski , 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 39/63] ipv6: Use memset_after() to zero rt6_info Date: Tue, 17 Aug 2021 23:05:09 -0700 Message-Id: <20210818060533.3569517-40-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=1045; h=from:subject; bh=Xphf8KZ59311q+SS41lPdZSHzYQuR48YTVr6kaXwlq8=; b=owEBbQKS/ZANAwAKAYly9N/cbcAmAcsmYgBhHKMmSJWz3eXi3vB6HuJ8ZVOxVmfPJDOfgTngkXFJ Y1HtemeJAjMEAAEKAB0WIQSlw/aPIp3WD3I+bhOJcvTf3G3AJgUCYRyjJgAKCRCJcvTf3G3AJlNxD/ 9sppezWOBqAWwsgfxRdXp14+IggzlcV6Cmuy+3yoHyda/CdCTve1snqU/mJj9ikiLYc+kAugfad4F0 cTsFl+ID962FFCkUfX+wrf2rcqUBBFlgJb2t38JcXrnDO88rm3r76AL2Wma0ueNPmaH5WllhHC2rCK fXKPe24PYrG5OSOBDVj0fD/osVthtrCfm/J2MtX+UxWh2FPgLGPm8bIuPN1IO4o/bkmRAPRJf3kWdx OKIoFSgRnAQCFZAkoDmto4fssngysQ/8xlWWYJ9nL7hXj3ybM7i4Riea2vc7uMtQ/LdrD24dqEDmKe f3+J4WogRasAKWDsVi1LKZLojHKBb+ZlIs6kkWujZ6bqPTPjVxgKPF1SyrDNzFRofsvKIdmiaocbM8 7Mbap+xZuyeBTwmrqENziN5DQQZC7J8joprP3D5XEgjPSSfo10I0ZhuYGFkZImfW3drIF9MNa/UFwb K/jR9NhcwjBeArtPiUgjZ/eTrdZygthG5tuDwEvP65vF/0qwPA/rmr7iPNZkf43crxfhCRZxUf8LGs suQoBCZbvMkCKKlTKgtbFTehnkPqB2dleq9pZC86P1KKoE7a9I7zAFa0vwJ32McHUjN4QjWLWEnIo1 ySO6vVD3cBOQ7RlV165HYCseHGnNSRZD6wdVzFjMgZMzsSBDx6RZHTkAU6fQ== 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. Use memset_after() to clear everything after the dst_entry member of struct rt6_info. Cc: "David S. Miller" Cc: Hideaki YOSHIFUJI Cc: David Ahern Cc: Jakub Kicinski Cc: netdev@vger.kernel.org Signed-off-by: Kees Cook --- net/ipv6/route.c | 4 +--- 1 file changed, 1 insertion(+), 3 deletions(-) diff --git a/net/ipv6/route.c b/net/ipv6/route.c index 6cf4bb89ca69..bd0ab3e436e7 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_after(rt, 0, dst); INIT_LIST_HEAD(&rt->rt6i_uncached); } -- 2.30.2