@@ -230,8 +230,29 @@ echo '=== Writable export ==='
fuse_export_add 'export-mp' "'mountpoint': '$EXT_MP', 'writable': true"
# Check that writing to the read-only export fails
-$QEMU_IO -f raw -c 'write -P 42 1M 64k' "$TEST_IMG" 2>&1 \
- | _filter_qemu_io | _filter_testdir | _filter_imgfmt
+output=$($QEMU_IO -f raw -c 'write -P 42 1M 64k' "$TEST_IMG" 2>&1 \
+ | _filter_qemu_io | _filter_testdir | _filter_imgfmt)
+
+# Expected reference output: Opening the file fails because it has no
+# write permission
+reference="Could not open 'TEST_DIR/t.IMGFMT': Permission denied"
+
+if echo "$output" | grep -q "$reference"; then
+ echo "Writing to read-only export failed: OK"
+elif echo "$output" | grep -q "write failed: Permission denied"; then
+ # With CAP_DAC_OVERRIDE (e.g. when running this test as root), the export
+ # can be opened regardless of its file permissions, but writing will then
+ # fail. This is not the result for which we want to test, so count this as
+ # a SKIP.
+ _casenotrun "Opening RO export as R/W succeeded, perhaps because of" \
+ "CAP_DAC_OVERRIDE"
+
+ # Still, write this to the reference output to make the test pass
+ echo "Writing to read-only export failed: OK"
+else
+ echo "Writing to read-only export failed: ERROR"
+ echo "$output"
+fi
# But here it should work
$QEMU_IO -f raw -c 'write -P 42 1M 64k' "$EXT_MP" | _filter_qemu_io
@@ -95,7 +95,7 @@ virtual size: 0 B (0 bytes)
'mountpoint': 'TEST_DIR/t.IMGFMT.fuse', 'writable': true
} }
{"return": {}}
-qemu-io: can't open device TEST_DIR/t.IMGFMT: Could not open 'TEST_DIR/t.IMGFMT': Permission denied
+Writing to read-only export failed: OK
wrote 65536/65536 bytes at offset 1048576
64 KiB, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
wrote 65536/65536 bytes at offset 1048576
With CAP_DAC_OVERRIDE (which e.g. root generally has), permission checks will be bypassed when opening files. 308 in one instance tries to open a read-only file (FUSE export) with qemu-io as read/write, and expects this to fail. However, when running it as root, opening will succeed (thanks to CAP_DAC_OVERRIDE) and only the actual write operation will fail. Note this as "Case not run", but have the test pass in either case. Reported-by: Vladimir Sementsov-Ogievskiy <vsementsov@virtuozzo.com> Fixes: 2c7dd057aa7bd7a875e9b1a53975c220d6380bc4 ("export/fuse: Pass default_permissions for mount") Signed-off-by: Hanna Reitz <hreitz@redhat.com> --- tests/qemu-iotests/308 | 25 +++++++++++++++++++++++-- tests/qemu-iotests/308.out | 2 +- 2 files changed, 24 insertions(+), 3 deletions(-)