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[198.145.64.163]) by smtp.gmail.com with ESMTPSA id v129sm7166195pfc.71.2021.06.21.14.54.21 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Mon, 21 Jun 2021 14:54:21 -0700 (PDT) From: Kees Cook To: "David S . Miller" Cc: Kees Cook , Sunil Goutham , Linu Cherian , Geetha sowjanya , Jerin Jacob , hariprasad , Subbaraya Sundeep , Jakub Kicinski , linux-kernel@vger.kernel.org, netdev@vger.kernel.org, linux-hardening@vger.kernel.org Subject: [PATCH] octeontx2-af: Avoid field-overflowing memcpy() Date: Mon, 21 Jun 2021 14:54:19 -0700 Message-Id: <20210621215419.1407886-1-keescook@chromium.org> X-Mailer: git-send-email 2.30.2 MIME-Version: 1.0 X-Patch-Hashes: v=1; h=sha256; g=b17b800f29ea6e6ad1b30b0c2ecbb7df53d261dd; i=11l6vH6fAxI3yJ0jzd3eaE2f+yyEs0bXJk1UH8s59xw=; m=9pzQoBWf6cgaZyB52H8V+Tt7PyeU+Nsu+QkJXmVQ/Sk=; p=6bBIi/RIyCcdYNjz3LFf9VU0AE7+w5vEKRR5cY+Qht0= X-Patch-Sig: m=pgp; i=keescook@chromium.org; s=0x0x8972F4DFDC6DC026; b=iQIzBAABCgAdFiEEpcP2jyKd1g9yPm4TiXL039xtwCYFAmDRCosACgkQiXL039xtwCbRrg/+OrW nyJ8YIB/UpRzbZHxWA1oSiqwjP9z2JIe4sFxhNYEzQrqrhKzi1Wduovg6z6UoQ98al9pa8mfMwkjS 2gQ9lxesJzFgYTdsOB7UVXQyu+r0s17xVgeYeDvWX0/0yjvfpNTUf1PA4kSp1lqTF7CSqWwK5yIwu +zJSgDk0l3HdCKPHtTo7t0lwVho45jKnsdJEBs8CBQO9zaD2hBEOawGopmQas7Xn80Bz+fb99wkwx UqwqrtYkDzUO11LGmRMcDa8ivU0hxVOBWC4wfrfU6Bev4vJPBTPPzdygjjTuFWGkf9Xjs7GQt8BRC YTu6aeWcfIvy2ESE1PRimwwnf/G+8o5EsbxNtmqdXeklc/oEecB9MjOChPz9dGoSxRbTzr2BlNsBI mXH6BKETE3e+qY5tSJ9pouJcuCMafSgsCjUXkzHgDeNJ/y+SJYBuoBRgvrihhPBkC7SFmo6/+24M8 rnBLcakwmw5wOZ5XU+z1B5gOxvtX1nTCEnDLjmaof1Mu6k1CDAtG5cAIKKQlx10VImJ4MZpEXFPho MOFmBdH6eADBk1Jla7W281yJqT/oc/ZpPU54sMbEja+sH9zhfciaDszw7cnxOKEUNfSXPTgL+8bk+ wX63AgUI+31sLhulhNQ/GrfbI0qhxRKTqCseaEDKuOhiXPxnf8Odo/5UMnzbeGes= Precedence: bulk List-ID: X-Mailing-List: netdev@vger.kernel.org X-Patchwork-Delegate: kuba@kernel.org In preparation for FORTIFY_SOURCE performing compile-time and run-time field bounds checking for memcpy(), memmove(), and memset(), avoid intentionally writing across neighboring fields. To avoid having memcpy() think a u64 "prof" is being written beyond, adjust the prof member type by adding struct nix_bandprof_s to the union to match the other structs. This silences the following future warning: In file included from ./include/linux/string.h:253, from ./include/linux/bitmap.h:10, from ./include/linux/cpumask.h:12, from ./arch/x86/include/asm/cpumask.h:5, from ./arch/x86/include/asm/msr.h:11, from ./arch/x86/include/asm/processor.h:22, from ./arch/x86/include/asm/timex.h:5, from ./include/linux/timex.h:65, from ./include/linux/time32.h:13, from ./include/linux/time.h:60, from ./include/linux/stat.h:19, from ./include/linux/module.h:13, from drivers/net/ethernet/marvell/octeontx2/af/rvu_nix.c:11: In function '__fortify_memcpy_chk', inlined from '__fortify_memcpy' at ./include/linux/fortify-string.h:310:2, inlined from 'rvu_nix_blk_aq_enq_inst' at drivers/net/ethernet/marvell/octeontx2/af/rvu_nix.c:910:5: ./include/linux/fortify-string.h:268:4: warning: call to '__write_overflow_field' declared with attribute warning: detected write beyond size of field (1st parameter); please use struct_group() [-Wattribute-warning] 268 | __write_overflow_field(); | ^~~~~~~~~~~~~~~~~~~~~~~~ drivers/net/ethernet/marvell/octeontx2/af/rvu_nix.c: ... else if (req->ctype == NIX_AQ_CTYPE_BANDPROF) memcpy(&rsp->prof, ctx, sizeof(struct nix_bandprof_s)); ... Signed-off-by: Kees Cook Tested-by: Subbaraya Sundeep --- drivers/net/ethernet/marvell/octeontx2/af/mbox.h | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/drivers/net/ethernet/marvell/octeontx2/af/mbox.h b/drivers/net/ethernet/marvell/octeontx2/af/mbox.h index 7d7dfa8d8a3f..770d86262838 100644 --- a/drivers/net/ethernet/marvell/octeontx2/af/mbox.h +++ b/drivers/net/ethernet/marvell/octeontx2/af/mbox.h @@ -746,7 +746,7 @@ struct nix_aq_enq_rsp { struct nix_cq_ctx_s cq; struct nix_rsse_s rss; struct nix_rx_mce_s mce; - u64 prof; + struct nix_bandprof_s prof; }; };