From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id CADA82F9982; Tue, 26 Aug 2025 11:39:15 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=10.30.226.201 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1756208355; cv=none; b=u2WdbycAMhpPphcePBQawJh975ixRUtX9JoYZah+M//3c8/UTFWM/1TshQEH7i7Su5WSgvofKYO8vs0gu+ZSr8IyU3PTYbNFJnxjnKtCW7miGoXaw7kqaKoDfaNdWoA8BBqQ4ksnFBJuWZsRQtt8BvgyH080DVxZQ5ic9Ij+lLg= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1756208355; c=relaxed/simple; bh=hH1tWKL/ifosvRhcXHBKbrR5obmGK57mhij/aE0KHE4=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=aotzNgKZuuMxtAmOihL67f//lmqwrVpfzcbDYOWY3Fq3ZMNlrvG86ouYK8qvvF4B564Q9kZhA5FWtN9fUC/Qzi6PdCawGd6PQuATX+qKkT/bwIndRdQA8MLq+uYG1d/ZvjBnhid4ZNXHsxWW/BAntmZo3Gh27MGFASXdIbtT+H0= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b=Zm/Jai9p; arc=none smtp.client-ip=10.30.226.201 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b="Zm/Jai9p" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 5581EC4CEF1; Tue, 26 Aug 2025 11:39:15 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1756208355; bh=hH1tWKL/ifosvRhcXHBKbrR5obmGK57mhij/aE0KHE4=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=Zm/Jai9pOYh5Ozu6Q6txVDVvExpqirzxtq8XZD7I8anYM5jMSBeDV9S1qmU7tEeSp v/oyNMsCas0xbadufaBbbuYYa+krKDFwjDTXEBKgLJ/aGZXJnic+JYqGcJaic7rI1Q cUrPpuTESIalK9obpKNVZL8xCQsDVteyXrxzHE1Q= From: Greg Kroah-Hartman To: stable@vger.kernel.org Cc: Greg Kroah-Hartman , patches@lists.linux.dev, Will Deacon , "Michael S. Tsirkin" , Stefano Garzarella Subject: [PATCH 6.12 080/322] vsock/virtio: Validate length in packet header before skb_put() Date: Tue, 26 Aug 2025 13:08:15 +0200 Message-ID: <20250826110917.592976636@linuxfoundation.org> X-Mailer: git-send-email 2.50.1 In-Reply-To: <20250826110915.169062587@linuxfoundation.org> References: <20250826110915.169062587@linuxfoundation.org> User-Agent: quilt/0.68 X-stable: review X-Patchwork-Hint: ignore Precedence: bulk X-Mailing-List: patches@lists.linux.dev List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit 6.12-stable review patch. If anyone has any objections, please let me know. ------------------ From: Will Deacon commit 0dab92484474587b82e8e0455839eaf5ac7bf894 upstream. When receiving a vsock packet in the guest, only the virtqueue buffer size is validated prior to virtio_vsock_skb_rx_put(). Unfortunately, virtio_vsock_skb_rx_put() uses the length from the packet header as the length argument to skb_put(), potentially resulting in SKB overflow if the host has gone wonky. Validate the length as advertised by the packet header before calling virtio_vsock_skb_rx_put(). Cc: Fixes: 71dc9ec9ac7d ("virtio/vsock: replace virtio_vsock_pkt with sk_buff") Signed-off-by: Will Deacon Message-Id: <20250717090116.11987-3-will@kernel.org> Signed-off-by: Michael S. Tsirkin Reviewed-by: Stefano Garzarella Signed-off-by: Greg Kroah-Hartman --- net/vmw_vsock/virtio_transport.c | 12 ++++++++++-- 1 file changed, 10 insertions(+), 2 deletions(-) --- a/net/vmw_vsock/virtio_transport.c +++ b/net/vmw_vsock/virtio_transport.c @@ -624,8 +624,9 @@ static void virtio_transport_rx_work(str do { virtqueue_disable_cb(vq); for (;;) { + unsigned int len, payload_len; + struct virtio_vsock_hdr *hdr; struct sk_buff *skb; - unsigned int len; if (!virtio_transport_more_replies(vsock)) { /* Stop rx until the device processes already @@ -642,11 +643,18 @@ static void virtio_transport_rx_work(str vsock->rx_buf_nr--; /* Drop short/long packets */ - if (unlikely(len < sizeof(struct virtio_vsock_hdr) || + if (unlikely(len < sizeof(*hdr) || len > virtio_vsock_skb_len(skb))) { kfree_skb(skb); continue; } + + hdr = virtio_vsock_hdr(skb); + payload_len = le32_to_cpu(hdr->len); + if (unlikely(payload_len > len - sizeof(*hdr))) { + kfree_skb(skb); + continue; + } virtio_vsock_skb_rx_put(skb); virtio_transport_deliver_tap_pkt(skb);