From patchwork Mon Sep 2 15:24:13 2019 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Peter Lieven X-Patchwork-Id: 1156665 Return-Path: X-Original-To: incoming@patchwork.ozlabs.org Delivered-To: patchwork-incoming@bilbo.ozlabs.org Authentication-Results: ozlabs.org; spf=pass (mailfrom) smtp.mailfrom=nongnu.org (client-ip=209.51.188.17; helo=lists.gnu.org; envelope-from=qemu-devel-bounces+incoming=patchwork.ozlabs.org@nongnu.org; receiver=) Authentication-Results: ozlabs.org; dmarc=none (p=none dis=none) header.from=kamp.de Received: from lists.gnu.org (lists.gnu.org [209.51.188.17]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by ozlabs.org (Postfix) with ESMTPS id 46MYmN40gSz9s7T for ; Tue, 3 Sep 2019 01:24:50 +1000 (AEST) Received: from localhost ([::1]:37454 helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1i4oCF-0003sN-DX for incoming@patchwork.ozlabs.org; Mon, 02 Sep 2019 11:24:47 -0400 Received: from eggs.gnu.org ([2001:470:142:3::10]:40401) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1i4oBs-0003rx-26 for qemu-devel@nongnu.org; Mon, 02 Sep 2019 11:24:25 -0400 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1i4oBp-0006wG-FE for qemu-devel@nongnu.org; Mon, 02 Sep 2019 11:24:22 -0400 Received: from kerio.kamp.de ([195.62.97.192]:35255) by eggs.gnu.org with esmtps (TLS1.0:DHE_RSA_AES_256_CBC_SHA1:32) (Exim 4.71) (envelope-from ) id 1i4oBp-0006rY-5j for qemu-devel@nongnu.org; Mon, 02 Sep 2019 11:24:21 -0400 X-Footer: a2FtcC5kZQ== Received: from submission.kamp.de ([195.62.97.28]) by kerio.kamp.de with ESMTPS (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256 bits)) for qemu-devel@nongnu.org; Mon, 2 Sep 2019 17:24:12 +0200 Received: (qmail 63058 invoked from network); 2 Sep 2019 15:24:15 -0000 Received: from lieven-pc.kamp-intra.net (HELO lieven-pc) (relay@kamp.de@::ffff:172.21.12.60) by submission.kamp.de with ESMTPS (DHE-RSA-AES256-GCM-SHA384 encrypted) ESMTPA; 2 Sep 2019 15:24:15 -0000 Received: by lieven-pc (Postfix, from userid 1060) id 3735513DF82; Mon, 2 Sep 2019 17:24:15 +0200 (CEST) From: Peter Lieven To: qemu-block@nongnu.org Date: Mon, 2 Sep 2019 17:24:13 +0200 Message-Id: <20190902152413.14070-1-pl@kamp.de> X-Mailer: git-send-email 2.17.1 X-detected-operating-system: by eggs.gnu.org: GNU/Linux 2.2.x-3.x [generic] X-Received-From: 195.62.97.192 Subject: [Qemu-devel] [PATCH V2] block/vhdx: add check for truncated image files X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.23 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: kwolf@redhat.com, codyprime@gmail.com, Peter Lieven , qemu-devel@nongnu.org, mreitz@redhat.com, jhf@kamp.de Errors-To: qemu-devel-bounces+incoming=patchwork.ozlabs.org@nongnu.org Sender: "Qemu-devel" qemu is currently not able to detect truncated vhdx image files. Add a basic check if all allocated blocks are reachable at open and report all errors during bdrv_co_check. Signed-off-by: Peter Lieven --- V2: - add error reporting [Kevin] - use bdrv_getlength instead of bdrv_get_allocated_file_size [Kevin] - factor out BAT entry check and add error reporting for region overlaps - already check on vhdx_open block/vhdx.c | 85 +++++++++++++++++++++++++++++++++++++++++----------- 1 file changed, 68 insertions(+), 17 deletions(-) diff --git a/block/vhdx.c b/block/vhdx.c index 6a09d0a55c..6afba5e8c2 100644 --- a/block/vhdx.c +++ b/block/vhdx.c @@ -24,6 +24,7 @@ #include "qemu/option.h" #include "qemu/crc32c.h" #include "qemu/bswap.h" +#include "qemu/error-report.h" #include "vhdx.h" #include "migration/blocker.h" #include "qemu/uuid.h" @@ -235,6 +236,9 @@ static int vhdx_region_check(BDRVVHDXState *s, uint64_t start, uint64_t length) end = start + length; QLIST_FOREACH(r, &s->regions, entries) { if (!((start >= r->end) || (end <= r->start))) { + error_report("VHDX region %" PRIu64 "-%" PRIu64 " overlaps with " + "region %" PRIu64 "-%." PRIu64, start, end, r->start, + r->end); ret = -EINVAL; goto exit; } @@ -877,6 +881,60 @@ static void vhdx_calc_bat_entries(BDRVVHDXState *s) } +static int vhdx_check_bat_entries(BlockDriverState *bs, int *errcnt) +{ + BDRVVHDXState *s = bs->opaque; + int64_t image_file_size = bdrv_getlength(bs->file->bs); + uint64_t payblocks = s->chunk_ratio; + int i, ret = 0; + + for (i = 0; i < s->bat_entries; i++) { + if ((s->bat[i] & VHDX_BAT_STATE_BIT_MASK) == + PAYLOAD_BLOCK_FULLY_PRESENT) { + /* + * Check if fully allocated BAT entries do not reside after + * end of the image file. + */ + if ((s->bat[i] & VHDX_BAT_FILE_OFF_MASK) + s->block_size > + image_file_size) { + error_report("VHDX BAT entry %d offset points after end of " + "file. Image has probably been truncated.", i); + ret = -EINVAL; + if (!errcnt) { + break; + } + (*errcnt)++; + } + + /* + * verify populated BAT field file offsets against + * region table and log entries + */ + if (payblocks--) { + /* payload bat entries */ + int ret2; + ret2 = vhdx_region_check(s, s->bat[i] & VHDX_BAT_FILE_OFF_MASK, + s->block_size); + if (ret2 < 0) { + ret = -EINVAL; + if (errcnt) { + break; + } + (*errcnt)++; + } + } else { + payblocks = s->chunk_ratio; + /* + * Once differencing files are supported, verify sector bitmap + * blocks here + */ + } + } + } + + return ret; +} + static void vhdx_close(BlockDriverState *bs) { BDRVVHDXState *s = bs->opaque; @@ -981,25 +1039,15 @@ static int vhdx_open(BlockDriverState *bs, QDict *options, int flags, goto fail; } - uint64_t payblocks = s->chunk_ratio; - /* endian convert, and verify populated BAT field file offsets against - * region table and log entries */ + /* endian convert populated BAT field entires */ for (i = 0; i < s->bat_entries; i++) { s->bat[i] = le64_to_cpu(s->bat[i]); - if (payblocks--) { - /* payload bat entries */ - if ((s->bat[i] & VHDX_BAT_STATE_BIT_MASK) == - PAYLOAD_BLOCK_FULLY_PRESENT) { - ret = vhdx_region_check(s, s->bat[i] & VHDX_BAT_FILE_OFF_MASK, - s->block_size); - if (ret < 0) { - goto fail; - } - } - } else { - payblocks = s->chunk_ratio; - /* Once differencing files are supported, verify sector bitmap - * blocks here */ + } + + if (!(flags & BDRV_O_CHECK)) { + ret = vhdx_check_bat_entries(bs, NULL); + if (ret < 0) { + goto fail; } } @@ -2072,6 +2120,9 @@ static int coroutine_fn vhdx_co_check(BlockDriverState *bs, if (s->log_replayed_on_open) { result->corruptions_fixed++; } + + vhdx_check_bat_entries(bs, &result->corruptions); + return 0; }