From mboxrd@z Thu Jan 1 00:00:00 1970 Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.remote-ip=100.103.45.18 ARC-Seal: i=1; d=subspace.kernel.org; s=arc20261015; a=rsa-sha256; cv=none; t=1792605742; b=zhTbtAMNX9Z9/HHUOhAOFmEUmfRdr9zvpDu2QV5nZNehA9BvEhu3GoZxeKZLPPnIB0/M PtW7OW78Chad9oTgmV6GjHWIlE1ebBe2KavrICdvi0AMzMULR32hh2Dg2dCZo9wzvFE19 NSqmb105DpENoXabzRkzKK7dEl3gQsBgoiL1rit9iHD4RgNForFgGYw8qroJho2F6pXAk YcvKAWTxtsYz8CKacGPD/LkXz/DHnfKGPtESG5rV1qcWHgfQxZFFkwcrEPyTlRQ3PppaV cdK4djsSnRvgpjG+vMKV7qfiUCDVLggHm9qErzTbV7pBS8/yHhtoD58kzRaH0Zlzquw== ARC-Message-Signature: i=1; d=subspace.kernel.org; s=arc20261015; a=rsa-sha256; c=relaxed/relaxed; t=1792605742; h=Received:DKIM-Signature:Subject:To:Cc:From:Date:Message-ID: MIME-Version:Content-Type:Content-Transfer-Encoding; bh=Bwk5SqsThNKGcypvSrxTzTQ77sFGi05aHLuR7ykL69c=; b=0Q1ys+E/g8flgPksmFjiBgi4d6KbjBP0310AvcSVJVgvtvhpBpKNcWuB10pzg/qu+pGl gtZY96ameOb9SMK9PClWMSpYluHqcBd8YLyP4r5HBgIIqehcKa5UdJzYKd575nkE4HS7z pfZlw9RM1lx52uQVYI/SsBtaoIcYWaCFh5MwNCKrAVXCDIQbiUXFG91bvkEO79roTGqcn 8QBce6YDbTkFm0lAyqgHW/atb8B9CkLfnmjS+N5ieOya1KWqOYhrZcKZ1GMChck9xVtBj Sb+WsQIp3MgHnE6HVE+vcy1rJjo1GLlRYZ0gncvxHkfrhGuahUnthrjZzxdtsuZlDTA== ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dkim=pass header.d=linuxfoundation.org header.i=@linuxfoundation.org header.a=rsa-sha256 header.s=korg header.b=OD6jkNt7; arc=none smtp.remote-ip=100.103.45.18 Received: from smtp.kernel.org (quasi.space.kernel.org [100.103.45.18]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature ECDSA (prime256v1)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 735AC606A31A for ; Wed, 21 Oct 2026 18:02:22 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key, unprotected) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.a=rsa-sha256 header.s=korg header.b=OD6jkNt7 Received: by smtp.kernel.org (Postfix) with ESMTPSA id 8281B1F000C1; Wed, 21 Oct 2026 18:02:21 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linuxfoundation.org; s=korg; t=1792605742; bh=Bwk5SqsThNKGcypvSrxTzTQ77sFGi05aHLuR7ykL69c=; h=Subject:To:Cc:From:Date; b=OD6jkNt7eOF3JtT1ZivYTORiZFt9tZTlRMbuYJZ3ilNbHPi/vcw5VNAOQRQCCLvqt 1ZAzPA1PYX8X6STU+Ry4HtLdiHiFENyixgl/En1T0tvdLIknLvdDtKR/eU6JzKmS7m C2bk7BC+1h0Tm4ujWl0rFg6V+ClyhdCc9XfPROXo= Subject: FAILED: patch "[PATCH] vsock/vmci: validate packet source for connected sockets" failed to apply to 6.12-stable tree To: 4ncienth@gmail.com,kuba@kernel.org,pabeni@redhat.com,sashiko-bot@kernel.org,sgarzare@redhat.com,vishnu.dasa@broadcom.com Cc: From: Date: Wed, 21 Oct 2026 19:56:21 +0200 Message-ID: <2026102121-spotty-barge-9a74@gregkh> X-Mailing-List: stable@vger.kernel.org List-Id: List-Post: List-Help: List-Subscribe: List-Unsubscribe: List-Owner: Precedence: list MIME-Version: 1.0 Content-Type: text/plain; charset=ANSI_X3.4-1968 Content-Transfer-Encoding: 8bit The patch below does not apply to the 6.12-stable tree. If someone wants it applied there, or to any other stable or longterm tree, then please email the backport, including the original git commit id to . To reproduce the conflict and resubmit, you may use the following commands: git fetch https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/ linux-6.12.y git checkout FETCH_HEAD git cherry-pick -x ad9a7da3fa39c2d616ec0dd3cf6e30531d032fe7 # git commit -s git send-email --to '' --in-reply-to '2026102121-spotty-barge-9a74@gregkh' --subject-prefix 'PATCH 6.12.y' 'HEAD^..' Possible dependencies: thanks, greg k-h ------------------ original commit in Linus's tree ------------------ >From ad9a7da3fa39c2d616ec0dd3cf6e30531d032fe7 Mon Sep 17 00:00:00 2001 From: Daehyeon Ko <4ncienth@gmail.com> Date: Wed, 26 Aug 2026 09:39:28 +0900 Subject: [PATCH] vsock/vmci: validate packet source for connected sockets vmci_transport_recv_stream_cb() looks up sockets first by the full source and destination tuple, then by destination only in the bound table. The fallback can select a non-listening socket without checking whether the packet came from its stored peer. This was reproduced with two VMCI contexts. A RST from the context not stored in a TCP_SYN_SENT socket reset that socket after it was selected by the destination-only lookup. VMCI can process notification packets in bottom-half context when the socket is not owned by user context, or defer packets to a workqueue. Use vsock_check_source() after taking the socket lock in the bottom-half path, and recheck after lock_sock() in the workqueue path. Listening sockets continue to accept packets from any source. Reply with a RST addressed from the received packet before dropping a source that fails validation. This preserves the existing reset behavior for bound non-listening and concurrently closed sockets without directing the reset to a connected socket's stored peer. Fixes: d021c344051a ("VSOCK: Introduce VM Sockets") Reported-by: Sashiko Closes: https://lore.kernel.org/netdev/20260814121255.6B5001F000E9@smtp.kernel.org/ Cc: stable@vger.kernel.org Suggested-by: Stefano Garzarella Suggested-by: Paolo Abeni Signed-off-by: Daehyeon Ko <4ncienth@gmail.com> Reviewed-by: Vishnu Dasa Link: https://patch.msgid.link/20260826003929.966160-3-4ncienth@gmail.com Signed-off-by: Jakub Kicinski diff --git a/net/vmw_vsock/vmci_transport.c b/net/vmw_vsock/vmci_transport.c index 1c4ee039c166..1f186e8f8364 100644 --- a/net/vmw_vsock/vmci_transport.c +++ b/net/vmw_vsock/vmci_transport.c @@ -680,11 +680,13 @@ static int vmci_transport_recv_stream_cb(void *data, struct vmci_datagram *dg) struct vmci_transport_packet *pkt; struct vsock_sock *vsk; bool bh_process_pkt; + bool drop_pkt; int err; sk = NULL; err = VMCI_SUCCESS; bh_process_pkt = false; + drop_pkt = false; /* Ignore incoming packets from resources that aren't vsock * implementations. @@ -765,17 +767,29 @@ static int vmci_transport_recv_stream_cb(void *data, struct vmci_datagram *dg) bh_lock_sock(sk); if (!sock_owned_by_user(sk)) { - /* The local context ID may be out of date, update it. */ - vsk->local_addr.svm_cid = dst.svm_cid; + if (sk->sk_state != TCP_LISTEN && + !vsock_check_source(vsk, &vmci_transport, &src)) { + drop_pkt = true; + err = VMCI_ERROR_NO_ACCESS; + } else { + /* The local context ID may be out of date, update it. */ + vsk->local_addr.svm_cid = dst.svm_cid; - if (sk->sk_state == TCP_ESTABLISHED) - vmci_trans(vsk)->notify_ops->handle_notify_pkt( - sk, pkt, true, &dst, &src, - &bh_process_pkt); + if (sk->sk_state == TCP_ESTABLISHED) + vmci_trans(vsk)->notify_ops->handle_notify_pkt(sk, pkt, true, + &dst, &src, + &bh_process_pkt); + } } bh_unlock_sock(sk); + if (drop_pkt) { + if (vmci_transport_send_reset_bh(&dst, &src, pkt) < 0) + pr_err("unable to send reset\n"); + goto out; + } + if (!bh_process_pkt) { struct vmci_transport_recv_pkt_info *recv_pkt_info; @@ -900,6 +914,7 @@ static void vmci_transport_recv_pkt_work(struct work_struct *work) { struct vmci_transport_recv_pkt_info *recv_pkt_info; struct vmci_transport_packet *pkt; + struct sockaddr_vm src; struct sock *sk; recv_pkt_info = @@ -908,6 +923,12 @@ static void vmci_transport_recv_pkt_work(struct work_struct *work) pkt = &recv_pkt_info->pkt; lock_sock(sk); + vsock_addr_init(&src, pkt->dg.src.context, pkt->src_port); + if (sk->sk_state != TCP_LISTEN && + !vsock_check_source(vsock_sk(sk), &vmci_transport, &src)) { + vmci_transport_reply_reset(pkt); + goto out; + } /* The local context ID may be out of date. */ vsock_sk(sk)->local_addr.svm_cid = pkt->dg.dst.context; @@ -937,6 +958,7 @@ static void vmci_transport_recv_pkt_work(struct work_struct *work) break; } +out: release_sock(sk); kfree(recv_pkt_info); /* Release reference obtained in the stream callback when we fetched