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[198.145.64.163]) by smtp.gmail.com with ESMTPSA id t20sm2997336pgb.16.2021.08.17.23.05.54 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Tue, 17 Aug 2021 23:05:57 -0700 (PDT) From: Kees Cook To: linux-kernel@vger.kernel.org Cc: Kees Cook , Raju Rangoju , "David S. Miller" , 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 14/63] cxgb3: Use struct_group() for memcpy() region Date: Tue, 17 Aug 2021 23:04:44 -0700 Message-Id: <20210818060533.3569517-15-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=1772; h=from:subject; bh=dC6mcEspFz77gHbxWbBozA/2WMcBANzLR6HyJHBb8Uk=; b=owEBbQKS/ZANAwAKAYly9N/cbcAmAcsmYgBhHKMgVl8joI0ywpJ0LBjKJdVvCciANpNIOWTCAd0k tQdZJNSJAjMEAAEKAB0WIQSlw/aPIp3WD3I+bhOJcvTf3G3AJgUCYRyjIAAKCRCJcvTf3G3AJpJlD/ 94VIp465N4ZikuyhCqr9oOxy3hfC8wSJm8aVEwloaG01XD1LFCR8s27vmn7TaR3Onvi0mShPzxfZVp z/0QHutcgzRmdKNmqUJplk8jCLV/Ka51qcE6BTRvOMGquGDo2ct0ChYwMZDk1LMPNJ2jm64OPw5nKY y0crYHeld2bi9RXWQ+Ukx77u16N/RWqpwUyRVbAqD1S4Bdan5KxpbN5Xq0t50nCnvKAyIzHv9Nk/+s bLOdz5lavXExfcEWBkCycCMFlNEl2riJKH5C9yoaPdGxylxjbWhFDsGBeTnUOVoiCNnlTV9RdcJl3R s029/Oh4nOA1H+Vg7mE0DW/vIHISxFXQ702NKF0D8XG5CuW1PTI6qbzGffXYHTDzApNzS7NmjkFTJs qvjyLJeTlYxFgqXgwtjvR2JZMsu/QY2tSZGxcZ2t2Vot8PoU19q6BtLBv2htxt/A1VgnpntQz8w3T9 2g3JsgEdrrRmIRG0jtyJgCi968GluQnrByGPGL0PLPvgKluk4p/jLJDYvjZg6GaoB0zLXOy3sXtYYt nnmde30+gam1BpjliHZbYIEqoSqGNVd0iwK8Deo4DkRqqFVT7CfbSDCPFub2TYNvLMWHfrp/zvIIXS uVJup0qetCqvbanZgkYM4YYEZmZ41k/RQ1gFaZ/uMI2ZTumZZrqJt1PlHysQ== X-Developer-Key: i=keescook@chromium.org; a=openpgp; fpr=A5C3F68F229DD60F723E6E138972F4DFDC6DC026 Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.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. Use struct_group() in struct rss_hdr around members imm_data and intr_gen, so they can be referenced together. This will allow memcpy() and sizeof() to more easily reason about sizes, improve readability, and avoid future warnings about writing beyond the end of imm_data. "pahole" shows no size nor member offset changes to struct rss_hdr. "objdump -d" shows no object code changes. Cc: Raju Rangoju Cc: "David S. Miller" Cc: Jakub Kicinski Cc: netdev@vger.kernel.org Signed-off-by: Kees Cook --- drivers/net/ethernet/chelsio/cxgb3/sge.c | 9 ++++++--- 1 file changed, 6 insertions(+), 3 deletions(-) diff --git a/drivers/net/ethernet/chelsio/cxgb3/sge.c b/drivers/net/ethernet/chelsio/cxgb3/sge.c index cb5c79c43bc9..1ab1bd86a3a6 100644 --- a/drivers/net/ethernet/chelsio/cxgb3/sge.c +++ b/drivers/net/ethernet/chelsio/cxgb3/sge.c @@ -126,8 +126,10 @@ struct rsp_desc { /* response queue descriptor */ struct rss_header rss_hdr; __be32 flags; __be32 len_cq; - u8 imm_data[47]; - u8 intr_gen; + struct_group(immediate, + u8 imm_data[47]; + u8 intr_gen; + ); }; /* @@ -929,7 +931,8 @@ static inline struct sk_buff *get_imm_packet(const struct rsp_desc *resp) if (skb) { __skb_put(skb, IMMED_PKT_SIZE); - skb_copy_to_linear_data(skb, resp->imm_data, IMMED_PKT_SIZE); + BUILD_BUG_ON(IMMED_PKT_SIZE != sizeof(resp->immediate)); + skb_copy_to_linear_data(skb, &resp->immediate, IMMED_PKT_SIZE); } return skb; } -- 2.30.2