The image streaming block job restricts shared permissions of the nodes
it accesses. This can obviously fail when other users already got these
permissions. &error_abort is therefore wrong and can crash. Handle these
errors gracefully and just fail starting the block job.
Reported-by: Nini Gu <n...@redhat.com>
Signed-off-by: Kevin Wolf <kw...@redhat.com>
---
Based-on: 20210309121814.31078-1-kw...@redhat.com
('storage-daemon: Call job_cancel_sync_all() on shutdown')
block/stream.c | 15 +++++++++++----
tests/qemu-iotests/tests/qsd-jobs | 20 ++++++++++++++++++++
tests/qemu-iotests/tests/qsd-jobs.out | 10 ++++++++++
3 files changed, 41 insertions(+), 4 deletions(-)
diff --git a/block/stream.c b/block/stream.c
index 1fa742b0db..97bee482dc 100644
--- a/block/stream.c
+++ b/block/stream.c
@@ -206,7 +206,7 @@ void stream_start(const char *job_id, BlockDriverState *bs,
const char *filter_node_name,
Error **errp)
{
- StreamBlockJob *s;
+ StreamBlockJob *s = NULL;
BlockDriverState *iter;
bool bs_read_only;
int basic_flags = BLK_PERM_CONSISTENT_READ | BLK_PERM_WRITE_UNCHANGED;
@@ -214,6 +214,7 @@ void stream_start(const char *job_id, BlockDriverState *bs,
BlockDriverState *cor_filter_bs = NULL;
BlockDriverState *above_base;
QDict *opts;
+ int ret;
assert(!(base && bottom));
assert(!(backing_file_str && bottom));
@@ -303,7 +304,7 @@ void stream_start(const char *job_id, BlockDriverState *bs,
* queried only at the job start and then cached.
*/
if (block_job_add_bdrv(&s->common, "active node", bs, 0,
- basic_flags | BLK_PERM_WRITE, &error_abort)) {
+ basic_flags | BLK_PERM_WRITE, errp)) {
goto fail;
}
@@ -320,8 +321,11 @@ void stream_start(const char *job_id, BlockDriverState *bs,
for (iter = bdrv_filter_or_cow_bs(bs); iter != base;
iter = bdrv_filter_or_cow_bs(iter))
{
- block_job_add_bdrv(&s->common, "intermediate node", iter, 0,
- basic_flags, &error_abort);
+ ret = block_job_add_bdrv(&s->common, "intermediate node", iter, 0,
+ basic_flags, errp);
+ if (ret < 0) {
+ goto fail;
+ }
}
s->base_overlay = base_overlay;
@@ -337,6 +341,9 @@ void stream_start(const char *job_id, BlockDriverState *bs,
return;
fail:
+ if (s) {
+ job_early_fail(&s->common.job);
+ }
if (cor_filter_bs) {
bdrv_cor_filter_drop(cor_filter_bs);
}
diff --git a/tests/qemu-iotests/tests/qsd-jobs
b/tests/qemu-iotests/tests/qsd-jobs
index 1a1c534fac..972b6b3898 100755
--- a/tests/qemu-iotests/tests/qsd-jobs
+++ b/tests/qemu-iotests/tests/qsd-jobs
@@ -30,6 +30,7 @@ status=1 # failure is the default!
_cleanup()
{
_cleanup_test_img
+ rm -f "$SOCK_DIR/nbd.sock"
}
trap "_cleanup; exit \$status" 0 1 2 3 15
@@ -59,6 +60,25 @@ $QSD --chardev stdio,id=stdio --monitor chardev=stdio \
{"execute": "quit"}
EOF
+echo
+echo "=== Streaming can't get permission on base node ==="
+echo
+
+# Just make sure that this doesn't crash
+$QSD --chardev stdio,id=stdio --monitor chardev=stdio \
+ --blockdev node-name=file_base,driver=file,filename="$TEST_IMG.base" \
+ --blockdev node-name=fmt_base,driver=qcow2,file=file_base \
+ --blockdev node-name=file_overlay,driver=file,filename="$TEST_IMG" \
+ --blockdev
node-name=fmt_overlay,driver=qcow2,file=file_overlay,backing=fmt_base \
+ --nbd-server addr.type=unix,addr.path="$SOCK_DIR/nbd.sock" \
+ --export type=nbd,id=export1,node-name=fmt_base,writable=on,name=export1 \
+ <<EOF | _filter_qmp
+{"execute": "qmp_capabilities"}
+{"execute": "block-stream",
+ "arguments": {"device": "fmt_overlay", "job-id": "job0"}}
+{"execute": "quit"}
+EOF
+
# success, all done
echo "*** done"
rm -f $seq.full
diff --git a/tests/qemu-iotests/tests/qsd-jobs.out
b/tests/qemu-iotests/tests/qsd-jobs.out
index e3a684b34d..05e1165e80 100644
--- a/tests/qemu-iotests/tests/qsd-jobs.out
+++ b/tests/qemu-iotests/tests/qsd-jobs.out
@@ -19,4 +19,14 @@ QMP_VERSION
{"timestamp": {"seconds": TIMESTAMP, "microseconds": TIMESTAMP}, "event":
"BLOCK_JOB_COMPLETED", "data": {"device": "job0", "len": 0, "offset": 0,
"speed": 0, "type": "commit"}}
{"timestamp": {"seconds": TIMESTAMP, "microseconds": TIMESTAMP}, "event":
"JOB_STATUS_CHANGE", "data": {"status": "concluded", "id": "job0"}}
{"timestamp": {"seconds": TIMESTAMP, "microseconds": TIMESTAMP}, "event":
"JOB_STATUS_CHANGE", "data": {"status": "null", "id": "job0"}}
+
+=== Streaming can't get permission on base node ===
+
+QMP_VERSION
+{"return": {}}
+{"timestamp": {"seconds": TIMESTAMP, "microseconds": TIMESTAMP}, "event":
"JOB_STATUS_CHANGE", "data": {"status": "created", "id": "job0"}}
+{"timestamp": {"seconds": TIMESTAMP, "microseconds": TIMESTAMP}, "event":
"JOB_STATUS_CHANGE", "data": {"status": "null", "id": "job0"}}
+{"error": {"class": "GenericError", "desc": "Conflicts with use by a block
device as 'root', which uses 'write' on fmt_base"}}
+{"return": {}}
+{"timestamp": {"seconds": TIMESTAMP, "microseconds": TIMESTAMP}, "event":
"BLOCK_EXPORT_DELETED", "data": {"id": "export1"}}
*** done
--
2.29.2
