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Thu, 14 May 2026 19:42:38 -0700 (PDT) From: Qi Tang To: paul@paul-moore.com Cc: davem@davemloft.net, kuba@kernel.org, pabeni@redhat.com, edumazet@google.com, netdev@vger.kernel.org, lyutoon@gmail.com, horms@kernel.org, linux-security-module@vger.kernel.org, Qi Tang Subject: Re: [PATCH net 4/4] netlabel: validate CIPSO option against skb tail in netlbl_skbuff_getattr Date: Fri, 15 May 2026 10:42:33 +0800 Message-ID: <20260515024233.204019-1-tpluszz77@gmail.com> X-Mailer: git-send-email 2.47.3 In-Reply-To: References: 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 Agreed on the return value, same reasoning as on 3/4: a length mismatch here means post-parse mutation, and the unlabeled fallback is the wrong default for that. v2 returns -EINVAL on all three CIPSO bounds checks. The 8 is the offset of the first tag's length byte. CIPSO option header is type(1) + length(1) + DOI(4) = 6, plus the first tag header type(1) + length(1) = 2. We need ptr+8 readable before dereferencing ptr[7]. v2 will document this inline, and use CIPSO_V4_HDR_LEN if it's exposed in the header. Qi