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Thu, 14 May 2026 09:51:47 -0700 (PDT) Received: from Tplus.localdomain ([114.243.117.21]) by smtp.gmail.com with ESMTPSA id d9443c01a7336-2bd5c2631basm27937825ad.34.2026.05.14.09.51.42 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 14 May 2026 09:51:46 -0700 (PDT) From: Qi Tang To: davem@davemloft.net, kuba@kernel.org, pabeni@redhat.com, edumazet@google.com Cc: netdev@vger.kernel.org, lyutoon@gmail.com, stable@vger.kernel.org, Qi Tang , David Ahern , Ido Schimmel , Simon Horman , Paul Moore , Huw Davies , linux-security-module@vger.kernel.org Subject: [PATCH net 0/4] net: trust-after-modification fixes for IPv4 options + netlabel Date: Fri, 15 May 2026 00:51:30 +0800 Message-ID: <20260514165139.436961-1-tpluszz77@gmail.com> X-Mailer: git-send-email 2.43.0 Precedence: bulk X-Mailing-List: linux-security-module@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Four small bounds-check fixes for a recurring pattern in IPv4 options and CIPSO/CALIPSO consumers. The parse-time validator stores only the option offset into IPCB / skb metadata. Later consumers (cmsg echo, mrouted report, netlabel getattr) re-read the length / pointer / cat_len bytes from the skb body and use them for indexed memcpy or bitmap walk. An nftables payload mutation reachable from an unprivileged user namespace (CAP_NET_ADMIN inside the namespace) rewrites those bytes between parse and consume. 1/4 __ip_options_echo() 40-byte stack OOB write (KASAN: stack-out-of-bounds, Write of size 255). 2/4 ipmr_cache_report() Up to 40-byte OOB read of skb head leaked into the IGMPMSG cmsg delivered to mrouted. 3/4 netlbl_skbuff_getattr() / CALIPSO ~232-byte slab OOB read driving SELinux/Smack MLS category bitmap. 4/4 netlbl_skbuff_getattr() / CIPSO Sibling of 3/4 on the AF_INET (CIPSO IPv4) path. Qi Tang (4): ipv4: validate ip_options length in __ip_options_echo() against skb tail ipv4: ipmr: clamp ip_hdrlen against skb_headlen in ipmr_cache_report netlabel: validate CALIPSO option against skb tail in netlbl_skbuff_getattr netlabel: validate CIPSO option against skb tail in netlbl_skbuff_getattr net/ipv4/ip_options.c | 8 ++++++++ net/ipv4/ipmr.c | 2 +- net/netlabel/netlabel_kapi.c | 27 +++++++++++++++++++++++---- 3 files changed, 32 insertions(+), 5 deletions(-) -- 2.47.3