| Message ID | 20210524142031.142109-11-vsementsov@virtuozzo.com (mailing list archive) |
|---|---|
| State | New, archived |
| Headers | show |
| Series | qcow2 check: check some reserved bits and subcluster bitmaps | expand |
On 24.05.21 16:20, Vladimir Sementsov-Ogievskiy wrote: > Split checking for reserved bits out of aligned offset check. > > Signed-off-by: Vladimir Sementsov-Ogievskiy <vsementsov@virtuozzo.com> > Reviewed-by: Eric Blake <eblake@redhat.com> > Tested-by: Kirill Tkhai <ktkhai@virtuozzo.com> > --- > block/qcow2.h | 1 + > block/qcow2-refcount.c | 10 +++++++++- > 2 files changed, 10 insertions(+), 1 deletion(-) Reviewed-by: Hanna Reitz <hreitz@redhat.com>
diff --git a/block/qcow2.h b/block/qcow2.h index 58fd7f1678..fd48a89d45 100644 --- a/block/qcow2.h +++ b/block/qcow2.h @@ -591,6 +591,7 @@ typedef enum QCow2MetadataOverlap { #define L2E_STD_RESERVED_MASK 0x3f000000000001feULL #define REFT_OFFSET_MASK 0xfffffffffffffe00ULL +#define REFT_RESERVED_MASK 0x1ffULL #define INV_OFFSET (-1ULL) diff --git a/block/qcow2-refcount.c b/block/qcow2-refcount.c index 5903e058b9..57311c5610 100644 --- a/block/qcow2-refcount.c +++ b/block/qcow2-refcount.c @@ -2091,9 +2091,17 @@ static int check_refblocks(BlockDriverState *bs, BdrvCheckResult *res, for(i = 0; i < s->refcount_table_size; i++) { uint64_t offset, cluster; - offset = s->refcount_table[i]; + offset = s->refcount_table[i] & REFT_OFFSET_MASK; cluster = offset >> s->cluster_bits; + if (s->refcount_table[i] & REFT_RESERVED_MASK) { + fprintf(stderr, "ERROR refcount table entry %" PRId64 " has " + "reserved bits set\n", i); + res->corruptions++; + *rebuild = true; + continue; + } + /* Refcount blocks are cluster aligned */ if (offset_into_cluster(s, offset)) { fprintf(stderr, "ERROR refcount block %" PRId64 " is not "