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[198.145.64.163]) by smtp.gmail.com with ESMTPSA id v10sm313376pfg.162.2021.11.18.10.37.49 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 18 Nov 2021 10:37:49 -0800 (PST) From: Kees Cook To: Saeed Mahameed Cc: Kees Cook , Leon Romanovsky , "David S. Miller" , Jakub Kicinski , linux-kernel@vger.kernel.org, netdev@vger.kernel.org, linux-rdma@vger.kernel.org, linux-hardening@vger.kernel.org Subject: [PATCH] net/mlx5e: Use struct_group() for memcpy() region Date: Thu, 18 Nov 2021 10:37:48 -0800 Message-Id: <20211118183748.1283069-1-keescook@chromium.org> X-Mailer: git-send-email 2.30.2 MIME-Version: 1.0 X-Developer-Signature: v=1; a=openpgp-sha256; l=2065; h=from:subject; bh=5h1/OCbcMC9fSZGebngnGdh+E0sfjUIlmjyL7n2bbX0=; b=owEBbQKS/ZANAwAKAYly9N/cbcAmAcsmYgBhlp171Vyvp59PAA8HQAbsKsvjRM9PHtYPsKBL4acu CDa8lw+JAjMEAAEKAB0WIQSlw/aPIp3WD3I+bhOJcvTf3G3AJgUCYZadewAKCRCJcvTf3G3AJjJyD/ 4nVg1irFelKvdZ02Th2MFSO4WzpimbnUZGifMbJ9L4pb52/n77LB3drjD6NSKlGtEaFlVyvNB/q0RH +t/6kzu/hCv25FLpy+J6YbtieBUc8Z7Kg7lW8weJX68+CWq+x3l0WyLhvkf9HlFZYWmrJBvC3AC6x5 dI0QXV4svrZEPVbYXsPfvAzX+4EDWdU9s7zA09cEH/a9lZdqyBvDoDQiTEEColX1wlqh13LZ3/n0Zq XOB4CCOqJCMlVnO9zINDvQYcH54PDqtqs4V9c9oZMVHbbyqELLtqCye3Ro0gFCi84RQ9pBtgBS+VDy mznZ3n6bPNcfnTfsA1Dihx8wWa6thbBI5S86q35YSkZxyiUnTU45jLBdYBhVE4I1oXDAVq/LpKYGv6 sgtYOkpjTGovnUhqboAgs8hfQQmAiZzzzKPq+86NsanzBWMWd3maqAMUNHYJPdJaqA6Uibnjke/1UI S5rQgcUS7i6Hbe3b2xk9hPo847RY/mh+MSUZHI4DPJAtgX0uxEfcLKoTZsGJFL+Qbe/MnmV8mTQ1RP 2oyRGggP9SLnZ1SNPIbbNbkpVYjgfgvMFseD5DfdK7/VdtmUkgFcwOc6uk6dy/cJF3dDOzAnHEhi1+ LbRyBwkAWgx7RJYydaCeTzzcKygH91nEK0WjuQja6ADP01c168owKfL4arnQ== 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 vlan_ethhdr around members h_dest and h_source, 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 h_dest. "pahole" shows no size nor member offset changes to struct vlan_ethhdr. "objdump -d" shows no object code changes. Signed-off-by: Kees Cook --- drivers/net/ethernet/mellanox/mlx5/core/en_tx.c | 2 +- include/linux/if_vlan.h | 6 ++++-- 2 files changed, 5 insertions(+), 3 deletions(-) diff --git a/drivers/net/ethernet/mellanox/mlx5/core/en_tx.c b/drivers/net/ethernet/mellanox/mlx5/core/en_tx.c index 7fd33b356cc8..ee7ecb88adc1 100644 --- a/drivers/net/ethernet/mellanox/mlx5/core/en_tx.c +++ b/drivers/net/ethernet/mellanox/mlx5/core/en_tx.c @@ -208,7 +208,7 @@ static inline void mlx5e_insert_vlan(void *start, struct sk_buff *skb, u16 ihs) int cpy1_sz = 2 * ETH_ALEN; int cpy2_sz = ihs - cpy1_sz; - memcpy(vhdr, skb->data, cpy1_sz); + memcpy(&vhdr->addrs, skb->data, cpy1_sz); vhdr->h_vlan_proto = skb->vlan_proto; vhdr->h_vlan_TCI = cpu_to_be16(skb_vlan_tag_get(skb)); memcpy(&vhdr->h_vlan_encapsulated_proto, skb->data + cpy1_sz, cpy2_sz); diff --git a/include/linux/if_vlan.h b/include/linux/if_vlan.h index 41a518336673..45aad461aa34 100644 --- a/include/linux/if_vlan.h +++ b/include/linux/if_vlan.h @@ -46,8 +46,10 @@ struct vlan_hdr { * @h_vlan_encapsulated_proto: packet type ID or len */ struct vlan_ethhdr { - unsigned char h_dest[ETH_ALEN]; - unsigned char h_source[ETH_ALEN]; + struct_group(addrs, + unsigned char h_dest[ETH_ALEN]; + unsigned char h_source[ETH_ALEN]; + ); __be16 h_vlan_proto; __be16 h_vlan_TCI; __be16 h_vlan_encapsulated_proto; -- 2.30.2