diff options
| author | Alberto Garcia <berto@igalia.com> | 2018-03-06 18:14:12 +0200 |
|---|---|---|
| committer | Kevin Wolf <kwolf@redhat.com> | 2018-03-09 15:17:47 +0100 |
| commit | 0c2ada8136a993b1fae9cee2c26b357e9c56c016 (patch) | |
| tree | 73a42021cb247729f0b834a31d114927ed381814 /block/qcow2-refcount.c | |
| parent | db5794f1f17d1f8247c0ea8e6f0376a47b112466 (diff) | |
qcow2: Make qemu-img check detect corrupted L1 tables in snapshots
'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>
Diffstat (limited to 'block/qcow2-refcount.c')
| -rw-r--r-- | block/qcow2-refcount.c | 14 |
1 files changed, 14 insertions, 0 deletions
diff --git a/block/qcow2-refcount.c b/block/qcow2-refcount.c index b18ea0ca98..362deaf303 100644 --- a/block/qcow2-refcount.c +++ b/block/qcow2-refcount.c @@ -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) { |