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 X-Spam-Level: X-Spam-Status: No, score=-16.8 required=3.0 tests=BAYES_00,DKIM_INVALID, DKIM_SIGNED,INCLUDES_CR_TRAILER,INCLUDES_PATCH,MAILING_LIST_MULTI, SPF_HELO_NONE,URIBL_BLOCKED,USER_AGENT_GIT autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id AB70DC11F6F for ; Sat, 10 Jul 2021 23:50:17 +0000 (UTC) Received: from smtp1.osuosl.org (smtp1.osuosl.org [140.211.166.138]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPS id 69B5561154 for ; Sat, 10 Jul 2021 23:50:17 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 69B5561154 Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=kernel.org Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=virtualization-bounces@lists.linux-foundation.org Received: from localhost (localhost [127.0.0.1]) by smtp1.osuosl.org (Postfix) with ESMTP id 4B18783AC8; Sat, 10 Jul 2021 23:50:17 +0000 (UTC) X-Virus-Scanned: amavisd-new at osuosl.org Received: from smtp1.osuosl.org ([127.0.0.1]) by localhost (smtp1.osuosl.org [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id FFmQn86y5RG3; Sat, 10 Jul 2021 23:50:16 +0000 (UTC) Received: from lists.linuxfoundation.org (lf-lists.osuosl.org [IPv6:2605:bc80:3010:104::8cd3:938]) by smtp1.osuosl.org (Postfix) with ESMTPS id C287983AB5; Sat, 10 Jul 2021 23:50:15 +0000 (UTC) Received: from lf-lists.osuosl.org (localhost [127.0.0.1]) by lists.linuxfoundation.org (Postfix) with ESMTP id A9933C0010; Sat, 10 Jul 2021 23:50:15 +0000 (UTC) Received: from smtp4.osuosl.org (smtp4.osuosl.org [140.211.166.137]) by lists.linuxfoundation.org (Postfix) with ESMTP id 2E11AC000E for ; Sat, 10 Jul 2021 23:50:14 +0000 (UTC) Received: from localhost (localhost [127.0.0.1]) by smtp4.osuosl.org (Postfix) with ESMTP id 1C23C404E0 for ; Sat, 10 Jul 2021 23:50:14 +0000 (UTC) X-Virus-Scanned: amavisd-new at osuosl.org Authentication-Results: smtp4.osuosl.org (amavisd-new); dkim=pass (2048-bit key) header.d=kernel.org Received: from smtp4.osuosl.org ([127.0.0.1]) by localhost (smtp4.osuosl.org [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id 3F3iq6--b_IU for ; Sat, 10 Jul 2021 23:50:12 +0000 (UTC) X-Greylist: domain auto-whitelisted by SQLgrey-1.8.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp4.osuosl.org (Postfix) with ESMTPS id E80D0404A0 for ; Sat, 10 Jul 2021 23:50:12 +0000 (UTC) Received: by mail.kernel.org (Postfix) with ESMTPSA id BE14961355; Sat, 10 Jul 2021 23:50:11 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1625961012; bh=HOxSyPrt04JCbP6msvV7QklAOcAnbKgXxpTQnRh46tI=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=JWCchJ8gB9juOrF6tEwdaMiiULSicP5443SSuV1DJZEdPfaIr8jSpEqFT1Vt9Uahk MHDaZTvu4ZTWwSaMxOcHvlpIuZle5+ThkLAoLwFT2QH7LO1g2jdSVcPy//u1frsPRI 6QDpfQ7ZRuPu+dseFTxCU85+uOYCMPl2o0jfA+2xkR4ukuO5S4Z7IkIetPN1nXtGH7 qZN3VFhTb6AGauxEVbfY0PvEj1HFpN67q9TfQS6+L+2UARAwEJBzp6uhF0y/EY3A32 fuaUAHuWf+8gTOVmJfuMpVPaCDRyddkQAyMLrA33/o7zGyxd/ysHr/OYomLbFJ6T79 lTRbJjOa7PAqQ== From: Sasha Levin To: linux-kernel@vger.kernel.org, stable@vger.kernel.org Subject: [PATCH AUTOSEL 5.12 41/43] virtio_console: Assure used length from device is limited Date: Sat, 10 Jul 2021 19:49:13 -0400 Message-Id: <20210710234915.3220342-41-sashal@kernel.org> X-Mailer: git-send-email 2.30.2 In-Reply-To: <20210710234915.3220342-1-sashal@kernel.org> References: <20210710234915.3220342-1-sashal@kernel.org> MIME-Version: 1.0 X-stable: review X-Patchwork-Hint: Ignore Cc: Sasha Levin , Xie Yongji , virtualization@lists.linux-foundation.org, "Michael S . Tsirkin" X-BeenThere: virtualization@lists.linux-foundation.org X-Mailman-Version: 2.1.15 Precedence: list List-Id: Linux virtualization List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Errors-To: virtualization-bounces@lists.linux-foundation.org Sender: "Virtualization" From: Xie Yongji [ Upstream commit d00d8da5869a2608e97cfede094dfc5e11462a46 ] The buf->len might come from an untrusted device. This ensures the value would not exceed the size of the buffer to avoid data corruption or loss. Signed-off-by: Xie Yongji Acked-by: Jason Wang Link: https://lore.kernel.org/r/20210525125622.1203-1-xieyongji@bytedance.com Signed-off-by: Michael S. Tsirkin Signed-off-by: Sasha Levin --- drivers/char/virtio_console.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) diff --git a/drivers/char/virtio_console.c b/drivers/char/virtio_console.c index 1836cc56e357..673522874cec 100644 --- a/drivers/char/virtio_console.c +++ b/drivers/char/virtio_console.c @@ -475,7 +475,7 @@ static struct port_buffer *get_inbuf(struct port *port) buf = virtqueue_get_buf(port->in_vq, &len); if (buf) { - buf->len = len; + buf->len = min_t(size_t, len, buf->size); buf->offset = 0; port->stats.bytes_received += len; } @@ -1712,7 +1712,7 @@ static void control_work_handler(struct work_struct *work) while ((buf = virtqueue_get_buf(vq, &len))) { spin_unlock(&portdev->c_ivq_lock); - buf->len = len; + buf->len = min_t(size_t, len, buf->size); buf->offset = 0; handle_control_message(vq->vdev, portdev, buf); -- 2.30.2 _______________________________________________ Virtualization mailing list Virtualization@lists.linux-foundation.org https://lists.linuxfoundation.org/mailman/listinfo/virtualization