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qcow2: Prevent allocating refcount blocks at offset 0 

Each entry in the qcow2 cache contains an offset field indicating the
location of the data in the qcow2 image. If the offset is 0 then it
means that the entry contains no data and is available to be used when
needed.

Because of that it is not possible to store in the cache the first
cluster of the qcow2 image (offset = 0). This is not a problem because
that cluster always contains the qcow2 header and we're not using this
cache for that.

However, if the qcow2 image is corrupted it can happen that we try to
allocate a new refcount block at offset 0, triggering this assertion
and crashing QEMU:

  qcow2_cache_entry_mark_dirty: Assertion `c->entries[i].offset != 0' failed

This patch adds an explicit check for this scenario and a new test
case.

This problem was originally reported here:

   https://bugs.launchpad.net/qemu/+bug/1728615

Reported-by: R.Nageswara Sastry <nasastry@in.ibm.com>
Signed-off-by: Alberto Garcia <berto@igalia.com>
Reviewed-by: Max Reitz <mreitz@redhat.com>
Message-id: 92a2fadd10d58b423f269c1d1a309af161cdc73f.1509718618.git.berto@igalia.com
Signed-off-by: Max Reitz <mreitz@redhat.com>
This commit is contained in:
Alberto Garcia 2017-11-03 16:18:50 +02:00 committed by Max Reitz
parent 191b5fbfa6
commit 6bf45d59f9
3 changed files with 26 additions and 0 deletions
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7
block/qcow2-refcount.c
View File

@ -367,6 +367,13 @@ static int alloc_refcount_block(BlockDriverState *bs,
return new_block;
}
/* If we're allocating the block at offset 0 then something is wrong */
if (new_block == 0) {
qcow2_signal_corruption(bs, true, -1, -1, "Preventing invalid "
"allocation of refcount block at offset 0");
return -EIO;
}
#ifdef DEBUG_ALLOC2
fprintf(stderr, "qcow2: Allocate refcount block %d for %" PRIx64
" at %" PRIx64 "\n",

11
tests/qemu-iotests/060
View File

@ -242,6 +242,17 @@ poke_file "$TEST_IMG" "$(($l2_offset+8))" "\x80\x00\x00\x00\x00\x06\x2a\x00"
# Should emit two error messages
$QEMU_IO -c "discard 0 64k" -c "read 64k 64k" "$TEST_IMG" | _filter_qemu_io
echo
echo "=== Testing empty refcount table with valid L1 and L2 tables ==="
echo
_make_test_img 64M
$QEMU_IO -c "write 0 64k" "$TEST_IMG" | _filter_qemu_io
poke_file "$TEST_IMG" "$rt_offset" "\x00\x00\x00\x00\x00\x00\x00\x00"
# Since the first data cluster is already allocated this triggers an
# allocation with an explicit offset (using qcow2_alloc_clusters_at())
# causing a refcount block to be allocated at offset 0
$QEMU_IO -c "write 0 128k" "$TEST_IMG" | _filter_qemu_io
# success, all done
echo "*** done"
rm -f $seq.full

8
tests/qemu-iotests/060.out
View File

@ -181,4 +181,12 @@ qcow2: Marking image as corrupt: Cluster allocation offset 0x62a00 unaligned (L2
discard 65536/65536 bytes at offset 0
64 KiB, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
read failed: Input/output error
=== Testing empty refcount table with valid L1 and L2 tables ===
Formatting 'TEST_DIR/t.IMGFMT', fmt=IMGFMT size=67108864
wrote 65536/65536 bytes at offset 0
64 KiB, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
qcow2: Marking image as corrupt: Preventing invalid allocation of refcount block at offset 0; further corruption events will be suppressed
write failed: Input/output error
*** done