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Mon, 21 Sep 2026 20:03:16 -0700 (PDT) Received: from localhost.localdomain ([2601:155:4200:2c80:2875:43a3:e345:710c]) by smtp.gmail.com with ESMTPSA id 00721157ae682-8a2c1b02abdsm1471447b3.17.2026.09.21.20.03.14 (version=TLS1_3 cipher=TLS_CHACHA20_POLY1305_SHA256 bits=256/256); Mon, 21 Sep 2026 20:03:15 -0700 (PDT) From: Paulos Yibelo To: netdev@vger.kernel.org Cc: richard@nod.at, anton.ivanov@cambridgegreys.com, johannes@sipsolutions.net, willemdebruijn.kernel@gmail.com, jasowangio@gmail.com, mst@redhat.com, eperezma@redhat.com, xuanzhuo@linux.alibaba.com, andrew+netdev@lunn.ch, pablo@netfilter.org, fw@strlen.de, phil@nwl.cc, razor@blackwall.org, idosch@nvidia.com, dsahern@kernel.org, davem@davemloft.net, edumazet@google.com, kuba@kernel.org, pabeni@redhat.com, horms@kernel.org, linux-um@lists.infradead.org, virtualization@lists.linux.dev, netfilter-devel@vger.kernel.org, coreteam@netfilter.org, bridge@lists.linux.dev, linux-kernel@vger.kernel.org Subject: [PATCH net v6 0/2] net: prevent partial checksums from modifying network headers Date: Mon, 21 Sep 2026 23:03:08 -0400 Message-ID: <20260922030310.8684-1-habte.yibelo@gmail.com> X-Mailer: git-send-email 2.46.0 Precedence: bulk X-Mailing-List: netdev@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit A virtio-net header can supply CHECKSUM_PARTIAL metadata whose checksum start resolves inside a network header. Software checksum completion can then modify bytes the stack has already parsed. Patch 1 checks the data-relative L3 origin in the virtio-net conversion paths. Patch 2 checks the parsed header length before checksum completion in IPv4 and IPv6 fragmentation paths. Changes in v6 address Michael S. Tsirkin's review of v5: - Name the Ethernet-only L3 parser accordingly. - Derive the AF_PACKET L3 offset and protocol from the actual Ethernet frame, including inline VLAN tags on an ETH_P_IP raw socket. - Use the IPv6 base-header minimum for IPv6 checksum-only packets, including IFF_TUN before skb->protocol is set. - Restore Assisted-by: LLM on both patches. Patch 2's code is unchanged. Validation: focused x86 allmodconfig and UML defconfig W=1 object builds, strict checkpatch, and application of the exact mail series to the stated base. No runtime regression reproducer was run. Link: https://lore.kernel.org/netdev/20260921025341.44846-1-habte.yibelo@gmail.com/ Paulos Yibelo (2): net: validate virtio checksum start after network header ip: reject partial checksums covering network headers arch/um/drivers/vector_transports.c | 13 +++- drivers/net/tun_vnet.h | 52 ++++++++++++- drivers/net/virtio_net.c | 10 ++- include/linux/virtio_net.h | 87 ++++++++++++++++++---- net/bridge/netfilter/nf_conntrack_bridge.c | 21 ++++-- net/ipv4/ip_output.c | 23 ++++-- net/ipv6/ip6_output.c | 12 ++- net/ipv6/netfilter.c | 12 ++- net/packet/af_packet.c | 24 +++++- 9 files changed, 214 insertions(+), 40 deletions(-) base-commit: 1e24c4f2ee44be0eee94092b5d13cbdb4bdf0d60 -- 2.46.0