From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 927A1C4332F for ; Fri, 1 Apr 2022 14:50:58 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S242908AbiDAOwo (ORCPT ); Fri, 1 Apr 2022 10:52:44 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:54884 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1350066AbiDAOrI (ORCPT ); Fri, 1 Apr 2022 10:47:08 -0400 Received: from dfw.source.kernel.org (dfw.source.kernel.org [139.178.84.217]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id E0CFF2A03FC; Fri, 1 Apr 2022 07:37:02 -0700 (PDT) Received: from smtp.kernel.org (relay.kernel.org [52.25.139.140]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by dfw.source.kernel.org (Postfix) with ESMTPS id E5B2B60915; Fri, 1 Apr 2022 14:36:31 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 7709AC340F2; Fri, 1 Apr 2022 14:36:29 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1648823791; bh=z2US9SuqGeb8MNBIv52FpTTXwXw4NnMl51Uz1mvkp6E=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=aXBntU8Y55DhgI2a7cIPEmWFZnyJ9i3ScEE1agmt7Atyy2LwYmJbmz6MDnOmr0p4r 2BVaNiareYG+hRCifSCHRjGQpwR01/Du4WzddCXmkxpJPqwRSQahDgrbUPfEfIylIz YRMypehPiqCi/pqCTUXa1iu72+9W+qcq79WomDtjdtoOefSOhR/dkoB/a00NCsnEwO i8y7eFI+HBfpKP2rmIWN5CAAvRaUFPEwx6Ir7cHBRqAuKxiN3qwD7KWBUE+mTqGM4k RNvG6QChdQrlMp3cjvZ/OeEAfEd+o2YdwL7hc3F2N81g2JRoSUH7Jvb+ZgqNAb4R8W n1ONGNDkcKrMw== From: Sasha Levin To: linux-kernel@vger.kernel.org, stable@vger.kernel.org Cc: Harold Huang , Eric Dumazet , Jason Wang , Jakub Kicinski , Sasha Levin , davem@davemloft.net, pabeni@redhat.com, mst@redhat.com, ast@kernel.org, daniel@iogearbox.net, hawk@kernel.org, john.fastabend@gmail.com, netdev@vger.kernel.org, kvm@vger.kernel.org, virtualization@lists.linux-foundation.org, bpf@vger.kernel.org Subject: [PATCH AUTOSEL 5.16 079/109] tuntap: add sanity checks about msg_controllen in sendmsg Date: Fri, 1 Apr 2022 10:32:26 -0400 Message-Id: <20220401143256.1950537-79-sashal@kernel.org> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20220401143256.1950537-1-sashal@kernel.org> References: <20220401143256.1950537-1-sashal@kernel.org> MIME-Version: 1.0 X-stable: review X-Patchwork-Hint: Ignore Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: netdev@vger.kernel.org From: Harold Huang [ Upstream commit 74a335a07a17d131b9263bfdbdcb5e40673ca9ca ] In patch [1], tun_msg_ctl was added to allow pass batched xdp buffers to tun_sendmsg. Although we donot use msg_controllen in this path, we should check msg_controllen to make sure the caller pass a valid msg_ctl. [1]: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=fe8dd45bb7556246c6b76277b1ba4296c91c2505 Reported-by: Eric Dumazet Suggested-by: Jason Wang Signed-off-by: Harold Huang Acked-by: Jason Wang Link: https://lore.kernel.org/r/20220303022441.383865-1-baymaxhuang@gmail.com Signed-off-by: Jakub Kicinski Signed-off-by: Sasha Levin --- drivers/net/tap.c | 3 ++- drivers/net/tun.c | 3 ++- drivers/vhost/net.c | 1 + 3 files changed, 5 insertions(+), 2 deletions(-) diff --git a/drivers/net/tap.c b/drivers/net/tap.c index 8e3a28ba6b28..ba2ef5437e16 100644 --- a/drivers/net/tap.c +++ b/drivers/net/tap.c @@ -1198,7 +1198,8 @@ static int tap_sendmsg(struct socket *sock, struct msghdr *m, struct xdp_buff *xdp; int i; - if (ctl && (ctl->type == TUN_MSG_PTR)) { + if (m->msg_controllen == sizeof(struct tun_msg_ctl) && + ctl && ctl->type == TUN_MSG_PTR) { for (i = 0; i < ctl->num; i++) { xdp = &((struct xdp_buff *)ctl->ptr)[i]; tap_get_user_xdp(q, xdp); diff --git a/drivers/net/tun.c b/drivers/net/tun.c index 45a67e72a02c..02de8d998bfa 100644 --- a/drivers/net/tun.c +++ b/drivers/net/tun.c @@ -2489,7 +2489,8 @@ static int tun_sendmsg(struct socket *sock, struct msghdr *m, size_t total_len) if (!tun) return -EBADFD; - if (ctl && (ctl->type == TUN_MSG_PTR)) { + if (m->msg_controllen == sizeof(struct tun_msg_ctl) && + ctl && ctl->type == TUN_MSG_PTR) { struct tun_page tpage; int n = ctl->num; int flush = 0; diff --git a/drivers/vhost/net.c b/drivers/vhost/net.c index 28ef323882fb..792ab5f23647 100644 --- a/drivers/vhost/net.c +++ b/drivers/vhost/net.c @@ -473,6 +473,7 @@ static void vhost_tx_batch(struct vhost_net *net, goto signal_used; msghdr->msg_control = &ctl; + msghdr->msg_controllen = sizeof(ctl); err = sock->ops->sendmsg(sock, msghdr, 0); if (unlikely(err < 0)) { vq_err(&nvq->vq, "Fail to batch sending packets\n"); -- 2.34.1