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iotests/308: Fix for CAP_DAC_OVERRIDE 

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: 2c7dd057aa
       ("export/fuse: Pass default_permissions for mount")
Signed-off-by: Hanna Reitz <hreitz@redhat.com>
Message-Id: <20220103120014.13061-1-hreitz@redhat.com>
Signed-off-by: Kevin Wolf <kwolf@redhat.com>
This commit is contained in:
Hanna Reitz 2022-01-03 13:00:14 +01:00 committed by Kevin Wolf
parent 2ca1d5d6b9
commit e2eec2819a
2 changed files with 24 additions and 3 deletions
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25
tests/qemu-iotests/308
View File

@ -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

2
tests/qemu-iotests/308.out
View File

@ -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