From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from eggs.gnu.org ([2001:4830:134:3::10]:38112) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1XF833-0008MH-1h for qemu-devel@nongnu.org; Wed, 06 Aug 2014 16:43:21 -0400 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1XF82o-0005Gc-MN for qemu-devel@nongnu.org; Wed, 06 Aug 2014 16:43:00 -0400 Received: from e9.ny.us.ibm.com ([32.97.182.139]:39521) by eggs.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1XF82o-0005GK-De for qemu-devel@nongnu.org; Wed, 06 Aug 2014 16:42:46 -0400 Received: from /spool/local by e9.ny.us.ibm.com with IBM ESMTP SMTP Gateway: Authorized Use Only! Violators will be prosecuted for from ; Wed, 6 Aug 2014 16:42:46 -0400 From: Michael Roth Date: Wed, 6 Aug 2014 15:38:59 -0500 Message-Id: <1407357598-21541-50-git-send-email-mdroth@linux.vnet.ibm.com> In-Reply-To: <1407357598-21541-1-git-send-email-mdroth@linux.vnet.ibm.com> References: <1407357598-21541-1-git-send-email-mdroth@linux.vnet.ibm.com> Subject: [Qemu-devel] [PATCH 049/108] qcow1: Stricter backing file length check List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , To: qemu-devel@nongnu.org Cc: qemu-stable@nongnu.org From: Kevin Wolf Like qcow2 since commit 6d33e8e7, error out on invalid lengths instead of silently truncating them to 1023. Also don't rely on bdrv_pread() catching integer overflows that make len negative, but use unsigned variables in the first place. Cc: qemu-stable@nongnu.org Signed-off-by: Kevin Wolf Reviewed-by: Benoit Canet (cherry picked from commit d66e5cee002c471b78139228a4e7012736b375f9) Signed-off-by: Michael Roth --- block/qcow.c | 7 +++++-- tests/qemu-iotests/092 | 11 +++++++++++ tests/qemu-iotests/092.out | 7 +++++++ 3 files changed, 23 insertions(+), 2 deletions(-) diff --git a/block/qcow.c b/block/qcow.c index f9cb009..c0a3b89 100644 --- a/block/qcow.c +++ b/block/qcow.c @@ -97,7 +97,8 @@ static int qcow_open(BlockDriverState *bs, QDict *options, int flags, Error **errp) { BDRVQcowState *s = bs->opaque; - int len, i, shift, ret; + unsigned int len, i, shift; + int ret; QCowHeader header; ret = bdrv_pread(bs->file, 0, &header, sizeof(header)); @@ -201,7 +202,9 @@ static int qcow_open(BlockDriverState *bs, QDict *options, int flags, if (header.backing_file_offset != 0) { len = header.backing_file_size; if (len > 1023) { - len = 1023; + error_setg(errp, "Backing file name too long"); + ret = -EINVAL; + goto fail; } ret = bdrv_pread(bs->file, header.backing_file_offset, bs->backing_file, len); diff --git a/tests/qemu-iotests/092 b/tests/qemu-iotests/092 index ae6ca76..a8c0c9c 100755 --- a/tests/qemu-iotests/092 +++ b/tests/qemu-iotests/092 @@ -43,6 +43,8 @@ _supported_fmt qcow _supported_proto generic _supported_os Linux +offset_backing_file_offset=8 +offset_backing_file_size=16 offset_size=24 offset_cluster_bits=32 offset_l2_bits=33 @@ -81,6 +83,15 @@ poke_file "$TEST_IMG" "$offset_size" "\xee\xee\xee\xee\xee\xee\xee\xee" poke_file "$TEST_IMG" "$offset_size" "\x7f\xff\xff\xff\xff\xff\xff\xff" { $QEMU_IO -c "write 0 64M" $TEST_IMG; } 2>&1 | _filter_qemu_io | _filter_testdir +echo +echo "== Invalid backing file length ==" +_make_test_img 64M +poke_file "$TEST_IMG" "$offset_backing_file_offset" "\x00\x00\x00\xff" +poke_file "$TEST_IMG" "$offset_backing_file_size" "\xff\xff\xff\xff" +{ $QEMU_IO -c "read 0 512" $TEST_IMG; } 2>&1 | _filter_qemu_io | _filter_testdir +poke_file "$TEST_IMG" "$offset_backing_file_size" "\x7f\xff\xff\xff" +{ $QEMU_IO -c "read 0 512" $TEST_IMG; } 2>&1 | _filter_qemu_io | _filter_testdir + # success, all done echo "*** done" rm -f $seq.full diff --git a/tests/qemu-iotests/092.out b/tests/qemu-iotests/092.out index ac03302..496d8f0 100644 --- a/tests/qemu-iotests/092.out +++ b/tests/qemu-iotests/092.out @@ -28,4 +28,11 @@ qemu-io: can't open device TEST_DIR/t.qcow: Image too large no file open, try 'help open' qemu-io: can't open device TEST_DIR/t.qcow: Image too large no file open, try 'help open' + +== Invalid backing file length == +Formatting 'TEST_DIR/t.IMGFMT', fmt=IMGFMT size=67108864 +qemu-io: can't open device TEST_DIR/t.qcow: Backing file name too long +no file open, try 'help open' +qemu-io: can't open device TEST_DIR/t.qcow: Backing file name too long +no file open, try 'help open' *** done -- 1.9.1