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[198.145.64.163]) by smtp.gmail.com with ESMTPSA id e4sm5075904pgi.94.2021.07.27.13.59.06 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Tue, 27 Jul 2021 13:59:08 -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 18/64] cxgb3: Use struct_group() for memcpy() region Date: Tue, 27 Jul 2021 13:58:09 -0700 Message-Id: <20210727205855.411487-19-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=1623; h=from:subject; bh=QhhwuNDqwvCqZzGgtIdcelj8gelXre9JSKqa+rdI4Ks=; b=owEBbQKS/ZANAwAKAYly9N/cbcAmAcsmYgBhAHOE+3A+NvAr12M3pvmHg5gBS+BMuzVkps12U6r6 oUWT/KOJAjMEAAEKAB0WIQSlw/aPIp3WD3I+bhOJcvTf3G3AJgUCYQBzhAAKCRCJcvTf3G3AJnYSD/ 9pCe8EneuIHsFG7O1h9Et9FPdQ4sf78aWG201MY4PkmUZ0eDhPiloiEL0ylEGfsAWVozXDrhIHytSc WDmiUNbkrIdxewQswK1NMMFNJ9Jg6zM/c8zAUNt/MzTm6UhPLvszd3txXLKTOrLOyhBueGBQ5hn+C1 5nEhLlbkW2lrfXHI6MECRZNC7n9ca6OXMeCF2+PxwSe96LQt65zkiu9DRp+JebzmgYrVRe3KCZA4++ 9s5AGSX4owqhIkXUVKuL5t+3moxKtTYBRIpDJFhv8IVHDuIXnjWcdqFudBLh0yEwuN7ojftkvan2dB BsuTkhZeg0acZ/dH0dqsbAQmWtVEBbr7DAfLSqRFyp6TZIID6Ixvj8fo5wG5smHK8Xlyl/GjlKxroY WDoUvKOW/J9slWszjune87PA91amTGSpQPBJ30fHEtl6pxwc2hvREl0rjOYopDh4fQVnlM/hG2RFL4 fodpvMq+aZajblMJTpkucy8wpuq+xzQmfu3HLPrOCeSb4MEvdRHmJz7i9ClO+p78cHY164Izuv0iXN dR11BddC3Oi//XeEhgFN90I/5ttFIoVhVZJPXT22XfeYrGSbMWnh7i8X2JPcxj3s6VhYSciaPqqxze NGd+nEE/9Bey/+V/7KcUxYiUZfNz7HPdVbAcPyXWIctj6leKTFSYkijFcf7g== X-Developer-Key: i=keescook@chromium.org; a=openpgp; fpr=A5C3F68F229DD60F723E6E138972F4DFDC6DC026 Precedence: bulk List-ID: X-Mailing-List: linux-wireless@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. 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; }