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authorKevin Wolf <kwolf@redhat.com>2014-03-26 13:05:45 +0100
committerStefan Hajnoczi <stefanha@redhat.com>2014-04-01 14:19:09 +0200
commitce48f2f441ca98885267af6fd636a7cb804ee646 (patch)
treebd5dd8a13a805d7408162ed456389cf868f472f9 /tests/qemu-iotests
parent8c7de28305a514d7f879fdfc677ca11fbf60d2e9 (diff)
downloadqemu-ce48f2f441ca98885267af6fd636a7cb804ee646.zip
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qcow2: Validate snapshot table offset/size (CVE-2014-0144)
This avoid unbounded memory allocation and fixes a potential buffer overflow on 32 bit hosts. Signed-off-by: Kevin Wolf <kwolf@redhat.com> Reviewed-by: Max Reitz <mreitz@redhat.com> Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
Diffstat (limited to 'tests/qemu-iotests')
-rwxr-xr-xtests/qemu-iotests/08027
-rw-r--r--tests/qemu-iotests/080.out17
2 files changed, 44 insertions, 0 deletions
diff --git a/tests/qemu-iotests/080 b/tests/qemu-iotests/080
index f58ac73..8a8b460 100755
--- a/tests/qemu-iotests/080
+++ b/tests/qemu-iotests/080
@@ -47,6 +47,8 @@ header_size=104
offset_backing_file_offset=8
offset_refcount_table_offset=48
offset_refcount_table_clusters=56
+offset_nb_snapshots=60
+offset_snapshots_offset=64
offset_header_size=100
offset_ext_magic=$header_size
offset_ext_size=$((header_size + 4))
@@ -90,6 +92,31 @@ poke_file "$TEST_IMG" "$offset_refcount_table_offset" "\xff\xff\xff\xff\xff\xff\
poke_file "$TEST_IMG" "$offset_refcount_table_clusters" "\x00\x00\x00\x7f"
{ $QEMU_IO -c "read 0 512" $TEST_IMG; } 2>&1 | _filter_qemu_io | _filter_testdir
+echo
+echo "== Invalid snapshot table =="
+_make_test_img 64M
+poke_file "$TEST_IMG" "$offset_nb_snapshots" "\xff\xff\xff\xff"
+{ $QEMU_IO -c "read 0 512" $TEST_IMG; } 2>&1 | _filter_qemu_io | _filter_testdir
+poke_file "$TEST_IMG" "$offset_nb_snapshots" "\x7f\xff\xff\xff"
+{ $QEMU_IO -c "read 0 512" $TEST_IMG; } 2>&1 | _filter_qemu_io | _filter_testdir
+
+poke_file "$TEST_IMG" "$offset_snapshots_offset" "\xff\xff\xff\xff\xff\xff\x00\x00"
+poke_file "$TEST_IMG" "$offset_nb_snapshots" "\x00\x00\xff\xff"
+{ $QEMU_IO -c "read 0 512" $TEST_IMG; } 2>&1 | _filter_qemu_io | _filter_testdir
+
+poke_file "$TEST_IMG" "$offset_snapshots_offset" "\x12\x34\x56\x78\x90\xab\xcd\xef"
+poke_file "$TEST_IMG" "$offset_nb_snapshots" "\x00\x00\x00\x00"
+{ $QEMU_IO -c "read 0 512" $TEST_IMG; } 2>&1 | _filter_qemu_io | _filter_testdir
+
+echo
+echo "== Hitting snapshot table size limit =="
+_make_test_img 64M
+# Put the refcount table in a more or less safe place (16 MB)
+poke_file "$TEST_IMG" "$offset_snapshots_offset" "\x00\x00\x00\x00\x01\x00\x00\x00"
+poke_file "$TEST_IMG" "$offset_nb_snapshots" "\x00\x01\x00\x00"
+{ $QEMU_IMG snapshot -c test $TEST_IMG; } 2>&1 | _filter_testdir
+{ $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/080.out b/tests/qemu-iotests/080.out
index f919b58..b06f47f 100644
--- a/tests/qemu-iotests/080.out
+++ b/tests/qemu-iotests/080.out
@@ -30,4 +30,21 @@ no file open, try 'help open'
Formatting 'TEST_DIR/t.IMGFMT', fmt=IMGFMT size=67108864
qemu-io: can't open device TEST_DIR/t.qcow2: Invalid reference count table offset
no file open, try 'help open'
+
+== Invalid snapshot table ==
+Formatting 'TEST_DIR/t.IMGFMT', fmt=IMGFMT size=67108864
+qemu-io: can't open device TEST_DIR/t.qcow2: Too many snapshots
+no file open, try 'help open'
+qemu-io: can't open device TEST_DIR/t.qcow2: Too many snapshots
+no file open, try 'help open'
+qemu-io: can't open device TEST_DIR/t.qcow2: Invalid snapshot table offset
+no file open, try 'help open'
+qemu-io: can't open device TEST_DIR/t.qcow2: Invalid snapshot table offset
+no file open, try 'help open'
+
+== Hitting snapshot table size limit ==
+Formatting 'TEST_DIR/t.IMGFMT', fmt=IMGFMT size=67108864
+qemu-img: Could not create snapshot 'test': -27 (File too large)
+read 512/512 bytes at offset 0
+512 bytes, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
*** done