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([2a01:4b00:bd21:4f00:7cc6:d3ca:494:116c]) by smtp.gmail.com with ESMTPSA id 4fb4d7f45d1cf-6b00aa4c9b8sm1413473a12.37.2026.10.08.06.03.26 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Thu, 08 Oct 2026 06:03:26 -0700 (PDT) Message-ID: <36d9e570-15d8-4a2d-aafb-3ee6e5681205@gmail.com> Date: Thu, 8 Oct 2026 14:03:17 +0100 Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH net v1] net: devmem: prevent mixing fragments from different bindings To: Mina Almasry , Stanislav Fomichev , Paolo Abeni , Kaiyuan Zhang , netdev@vger.kernel.org, linux-kernel@vger.kernel.org Cc: "David S. Miller" , Eric Dumazet , Jakub Kicinski , Simon Horman , Bobby Eshleman , Ralf Lici References: <20261008033952.1399670-1-almasrymina@google.com> Content-Language: en-US From: Pavel Begunkov In-Reply-To: <20261008033952.1399670-1-almasrymina@google.com> Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit On 10/8/26 04:39, Mina Almasry wrote: > validate_xmit_unreadable_skb() only inspects shinfo->frags[0] and > assumes all fragments in an unreadable skb belong to that same devmem > binding. However, tcp_sendmsg_locked() only checks that readability > matches the presence of a binding (skb_frags_readable(skb) != !binding), > allowing consecutive sendmsg() calls with different dmabuf bindings to > collapse into the same skb and bypass per-device and unbind checks in > validate_xmit_unreadable_skb(). > > Add net_devmem_skb_binding() to query the binding associated with an > skb, reuse it in validate_xmit_unreadable_skb(), and check in > zerocopy_fill_skb_from_devmem() that existing fragments match the target > binding. Looks good Pavel Begunkov -- Pavel Begunkov