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([2a01:4b00:bd21:4f00:7cc6:d3ca:494:116c]) by smtp.gmail.com with ESMTPSA id 5b1f17b1804b1-4a17f493761sm221691685e9.2.2026.10.08.06.16.09 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Thu, 08 Oct 2026 06:16:09 -0700 (PDT) Message-ID: <6fbab5ad-e95b-4a19-a59e-4a1ec9a4f225@gmail.com> Date: Thu, 8 Oct 2026 14:16:00 +0100 Precedence: bulk X-Mailing-List: netdev@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 From: Pavel Begunkov 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> <36d9e570-15d8-4a2d-aafb-3ee6e5681205@gmail.com> Content-Language: en-US In-Reply-To: <36d9e570-15d8-4a2d-aafb-3ee6e5681205@gmail.com> Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit On 10/8/26 14:03, Pavel Begunkov wrote: > 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 Oops, should be reviewed-by Reviewed-by: Pavel Begunkov -- Pavel Begunkov