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qcow2-refcount: check_refcounts_l1(): check reserved bits 

Signed-off-by: Vladimir Sementsov-Ogievskiy <vsementsov@virtuozzo.com>
Reviewed-by: Eric Blake <eblake@redhat.com>
Tested-by: Kirill Tkhai <ktkhai@virtuozzo.com>
Reviewed-by: Hanna Reitz <hreitz@redhat.com>
Message-Id: <20210914122454.141075-10-vsementsov@virtuozzo.com>
Signed-off-by: Hanna Reitz <hreitz@redhat.com>
This commit is contained in:
Vladimir Sementsov-Ogievskiy 2021-09-14 15:24:53 +03:00 committed by Hanna Reitz
parent cd6efd60e9
commit 98bc07d6cd
2 changed files with 7 additions and 0 deletions
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6
block/qcow2-refcount.c
View File

@ -1902,6 +1902,12 @@ static int check_refcounts_l1(BlockDriverState *bs,
continue;
}
if (l1_table[i] & L1E_RESERVED_MASK) {
fprintf(stderr, "ERROR found L1 entry with reserved bits set: "
"%" PRIx64 "\n", l1_table[i]);
res->corruptions++;
}
l2_offset = l1_table[i] & L1E_OFFSET_MASK;
/* Mark L2 table as used */

1
block/qcow2.h
View File

@ -586,6 +586,7 @@ typedef enum QCow2MetadataOverlap {
(QCOW2_OL_CACHED | QCOW2_OL_INACTIVE_L2)
#define L1E_OFFSET_MASK 0x00fffffffffffe00ULL
#define L1E_RESERVED_MASK 0x7f000000000001ffULL
#define L2E_OFFSET_MASK 0x00fffffffffffe00ULL
#define L2E_STD_RESERVED_MASK 0x3f000000000001feULL