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 575FAC433EF for ; Mon, 29 Nov 2021 22:15:24 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S234197AbhK2WSk (ORCPT ); Mon, 29 Nov 2021 17:18:40 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:56698 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S232256AbhK2WQu (ORCPT ); Mon, 29 Nov 2021 17:16:50 -0500 Received: from ams.source.kernel.org (ams.source.kernel.org [IPv6:2604:1380:4601:e00::1]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 6B2A6C12A744; Mon, 29 Nov 2021 10:22:51 -0800 (PST) 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 ams.source.kernel.org (Postfix) with ESMTPS id 340A5B815D8; Mon, 29 Nov 2021 18:22:50 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 618A6C53FAD; Mon, 29 Nov 2021 18:22:48 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1638210168; bh=ESoaIK34csQ1vjXp7MT5Dr3PqUJpW09XP33yV6MX5R4=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=ME30do61bUrm9HcArsQ1mfJYfWZjHfWsqGvJ6+ZMruvo8FITxu+gm2hzVTQ9UtNSv dvt9pCVt6rfHvmcLnqSOY+3xF193ALE1PMWloDEp/FzVj8ApHCuWXp5nLn/a9ZpI52 aFd7kXoTzo8+Fjzk7L7J4DPmabRf2kKkjFKBtVPo= From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Juergen Gross , Jan Beulich , =?UTF-8?q?Roger=20Pau=20Monn=C3=A9?= Subject: [PATCH 4.19 64/69] xen/blkfront: dont trust the backend response data blindly Date: Mon, 29 Nov 2021 19:18:46 +0100 Message-Id: <20211129181705.725376687@linuxfoundation.org> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20211129181703.670197996@linuxfoundation.org> References: <20211129181703.670197996@linuxfoundation.org> User-Agent: quilt/0.66 MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: Juergen Gross commit b94e4b147fd1992ad450e1fea1fdaa3738753373 upstream. Today blkfront will trust the backend to send only sane response data. In order to avoid privilege escalations or crashes in case of malicious backends verify the data to be within expected limits. Especially make sure that the response always references an outstanding request. Introduce a new state of the ring BLKIF_STATE_ERROR which will be switched to in case an inconsistency is being detected. Recovering from this state is possible only via removing and adding the virtual device again (e.g. via a suspend/resume cycle). Make all warning messages issued due to valid error responses rate limited in order to avoid message floods being triggered by a malicious backend. Signed-off-by: Juergen Gross Reviewed-by: Jan Beulich Acked-by: Roger Pau Monné Link: https://lore.kernel.org/r/20210730103854.12681-4-jgross@suse.com Signed-off-by: Juergen Gross Signed-off-by: Greg Kroah-Hartman --- drivers/block/xen-blkfront.c | 70 ++++++++++++++++++++++++++++++++----------- 1 file changed, 53 insertions(+), 17 deletions(-) --- a/drivers/block/xen-blkfront.c +++ b/drivers/block/xen-blkfront.c @@ -80,6 +80,7 @@ enum blkif_state { BLKIF_STATE_DISCONNECTED, BLKIF_STATE_CONNECTED, BLKIF_STATE_SUSPENDED, + BLKIF_STATE_ERROR, }; struct grant { @@ -89,6 +90,7 @@ struct grant { }; enum blk_req_status { + REQ_PROCESSING, REQ_WAITING, REQ_DONE, REQ_ERROR, @@ -533,7 +535,7 @@ static unsigned long blkif_ring_get_requ id = get_id_from_freelist(rinfo); rinfo->shadow[id].request = req; - rinfo->shadow[id].status = REQ_WAITING; + rinfo->shadow[id].status = REQ_PROCESSING; rinfo->shadow[id].associated_id = NO_ASSOCIATED_ID; rinfo->shadow[id].req.u.rw.id = id; @@ -562,6 +564,7 @@ static int blkif_queue_discard_req(struc /* Copy the request to the ring page. */ *final_ring_req = *ring_req; + rinfo->shadow[id].status = REQ_WAITING; return 0; } @@ -837,8 +840,11 @@ static int blkif_queue_rw_req(struct req /* Copy request(s) to the ring page. */ *final_ring_req = *ring_req; - if (unlikely(require_extra_req)) + rinfo->shadow[id].status = REQ_WAITING; + if (unlikely(require_extra_req)) { *final_extra_ring_req = *extra_ring_req; + rinfo->shadow[extra_id].status = REQ_WAITING; + } if (new_persistent_gnts) gnttab_free_grant_references(setup.gref_head); @@ -1412,8 +1418,8 @@ static enum blk_req_status blkif_rsp_to_ static int blkif_get_final_status(enum blk_req_status s1, enum blk_req_status s2) { - BUG_ON(s1 == REQ_WAITING); - BUG_ON(s2 == REQ_WAITING); + BUG_ON(s1 < REQ_DONE); + BUG_ON(s2 < REQ_DONE); if (s1 == REQ_ERROR || s2 == REQ_ERROR) return BLKIF_RSP_ERROR; @@ -1446,7 +1452,7 @@ static bool blkif_completion(unsigned lo s->status = blkif_rsp_to_req_status(bret->status); /* Wait the second response if not yet here. */ - if (s2->status == REQ_WAITING) + if (s2->status < REQ_DONE) return false; bret->status = blkif_get_final_status(s->status, @@ -1565,11 +1571,17 @@ static irqreturn_t blkif_interrupt(int i spin_lock_irqsave(&rinfo->ring_lock, flags); again: - rp = rinfo->ring.sring->rsp_prod; - rmb(); /* Ensure we see queued responses up to 'rp'. */ + rp = READ_ONCE(rinfo->ring.sring->rsp_prod); + virt_rmb(); /* Ensure we see queued responses up to 'rp'. */ + if (RING_RESPONSE_PROD_OVERFLOW(&rinfo->ring, rp)) { + pr_alert("%s: illegal number of responses %u\n", + info->gd->disk_name, rp - rinfo->ring.rsp_cons); + goto err; + } for (i = rinfo->ring.rsp_cons; i != rp; i++) { unsigned long id; + unsigned int op; RING_COPY_RESPONSE(&rinfo->ring, i, &bret); id = bret.id; @@ -1580,14 +1592,28 @@ static irqreturn_t blkif_interrupt(int i * look in get_id_from_freelist. */ if (id >= BLK_RING_SIZE(info)) { - WARN(1, "%s: response to %s has incorrect id (%ld)\n", - info->gd->disk_name, op_name(bret.operation), id); - /* We can't safely get the 'struct request' as - * the id is busted. */ - continue; + pr_alert("%s: response has incorrect id (%ld)\n", + info->gd->disk_name, id); + goto err; + } + if (rinfo->shadow[id].status != REQ_WAITING) { + pr_alert("%s: response references no pending request\n", + info->gd->disk_name); + goto err; } + + rinfo->shadow[id].status = REQ_PROCESSING; req = rinfo->shadow[id].request; + op = rinfo->shadow[id].req.operation; + if (op == BLKIF_OP_INDIRECT) + op = rinfo->shadow[id].req.u.indirect.indirect_op; + if (bret.operation != op) { + pr_alert("%s: response has wrong operation (%u instead of %u)\n", + info->gd->disk_name, bret.operation, op); + goto err; + } + if (bret.operation != BLKIF_OP_DISCARD) { /* * We may need to wait for an extra response if the @@ -1612,7 +1638,8 @@ static irqreturn_t blkif_interrupt(int i case BLKIF_OP_DISCARD: if (unlikely(bret.status == BLKIF_RSP_EOPNOTSUPP)) { struct request_queue *rq = info->rq; - printk(KERN_WARNING "blkfront: %s: %s op failed\n", + + pr_warn_ratelimited("blkfront: %s: %s op failed\n", info->gd->disk_name, op_name(bret.operation)); blkif_req(req)->error = BLK_STS_NOTSUPP; info->feature_discard = 0; @@ -1624,13 +1651,13 @@ static irqreturn_t blkif_interrupt(int i case BLKIF_OP_FLUSH_DISKCACHE: case BLKIF_OP_WRITE_BARRIER: if (unlikely(bret.status == BLKIF_RSP_EOPNOTSUPP)) { - printk(KERN_WARNING "blkfront: %s: %s op failed\n", + pr_warn_ratelimited("blkfront: %s: %s op failed\n", info->gd->disk_name, op_name(bret.operation)); blkif_req(req)->error = BLK_STS_NOTSUPP; } if (unlikely(bret.status == BLKIF_RSP_ERROR && rinfo->shadow[id].req.u.rw.nr_segments == 0)) { - printk(KERN_WARNING "blkfront: %s: empty %s op failed\n", + pr_warn_ratelimited("blkfront: %s: empty %s op failed\n", info->gd->disk_name, op_name(bret.operation)); blkif_req(req)->error = BLK_STS_NOTSUPP; } @@ -1645,8 +1672,9 @@ static irqreturn_t blkif_interrupt(int i case BLKIF_OP_READ: case BLKIF_OP_WRITE: if (unlikely(bret.status != BLKIF_RSP_OKAY)) - dev_dbg(&info->xbdev->dev, "Bad return from blkdev data " - "request: %x\n", bret.status); + dev_dbg_ratelimited(&info->xbdev->dev, + "Bad return from blkdev data request: %#x\n", + bret.status); break; default: @@ -1671,6 +1699,14 @@ static irqreturn_t blkif_interrupt(int i spin_unlock_irqrestore(&rinfo->ring_lock, flags); return IRQ_HANDLED; + + err: + info->connected = BLKIF_STATE_ERROR; + + spin_unlock_irqrestore(&rinfo->ring_lock, flags); + + pr_alert("%s disabled for further use\n", info->gd->disk_name); + return IRQ_HANDLED; }