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qcow2: Make qemu-img check detect corrupted L1 tables in snapshots

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'qemu-img check' cannot detect if a snapshot's L1 table is corrupted.
This patch checks the table's offset and size and reports corruption
if the values are not valid.

This patch doesn't add code to fix that corruption yet, only to detect
and report it.

Signed-off-by: Alberto Garcia <berto@igalia.com>
Reviewed-by: Eric Blake <eblake@redhat.com>
Signed-off-by: Kevin Wolf <kwolf@redhat.com>
This commit is contained in:
Alberto Garcia 2018-03-06 18:14:12 +02:00 • committed by Kevin Wolf
parent db5794f1f1
commit 0c2ada8136
3 changed files with 36 additions and 0 deletions
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14
block/qcow2-refcount.c
View file

@ -2047,6 +2047,20 @@ static int calculate_refcounts(BlockDriverState *bs, BdrvCheckResult *res,
/* snapshots */
for (i = 0; i < s->nb_snapshots; i++) {
sn = s->snapshots + i;
if (offset_into_cluster(s, sn->l1_table_offset)) {
fprintf(stderr, "ERROR snapshot %s (%s) l1_offset=%#" PRIx64 ": "
"L1 table is not cluster aligned; snapshot table entry "
"corrupted\n", sn->id_str, sn->name, sn->l1_table_offset);
res->corruptions++;
continue;
}
if (sn->l1_size > QCOW_MAX_L1_SIZE / sizeof(uint64_t)) {
fprintf(stderr, "ERROR snapshot %s (%s) l1_size=%#" PRIx32 ": "
"L1 table is too large; snapshot table entry corrupted\n",
sn->id_str, sn->name, sn->l1_size);
res->corruptions++;
continue;
}
ret = check_refcounts_l1(bs, res, refcount_table, nb_clusters,
sn->l1_table_offset, sn->l1_size, 0, fix);
if (ret < 0) {