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| author |   aliguori <aliguori@c046a42c-6fe2-441c-8c8c-71466251a162> | 2009-04-21 23:12:02 +0000 |
|---|---|---|
| committer | aliguori <aliguori@c046a42c-6fe2-441c-8c8c-71466251a162> | 2009-04-21 23:12:02 +0000 |
| commit | 54c42368f57c02b0970bb32b4542f99b913908ba (patch) | |
| tree | 6ee1edba29568dc112a7c7d5c5d1665726f7f7ed /block-qcow2.c | |
| parent | qcow2: Refcount checking code cleanup (Kevin Wolf) (diff) | |
| download | qemu-kvm-54c42368f57c02b0970bb32b4542f99b913908ba.tar.gz qemu-kvm-54c42368f57c02b0970bb32b4542f99b913908ba.tar.bz2 qemu-kvm-54c42368f57c02b0970bb32b4542f99b913908ba.zip | |
qcow2: Add plausibility check for L1/L2 entries (Kevin Wolf)
From: Kevin Wolf <kwolf@redhat.com>
All L1 and L2 entries must point at the start of a cluster. If there is some
offset into the cluster, the entry is corrupted.
Signed-off-by: Kevin Wolf <kwolf@redhat.com>
Signed-off-by: Anthony Liguori <aliguori@us.ibm.com>
git-svn-id: svn://svn.savannah.nongnu.org/qemu/trunk@7217 c046a42c-6fe2-441c-8c8c-71466251a162
Diffstat (limited to 'block-qcow2.c')
| -rw-r--r-- | block-qcow2.c | 14 |
1 files changed, 14 insertions, 0 deletions
diff --git a/block-qcow2.c b/block-qcow2.c index eacac4d35..7840634b5 100644 --- a/block-qcow2.c +++ b/block-qcow2.c @@ -2666,6 +2666,13 @@ static int check_refcounts_l2(BlockDriverState *bs, errors += inc_refcounts(bs, refcount_table, refcount_table_size, offset, s->cluster_size); + + /* Correct offsets are cluster aligned */ + if (offset & (s->cluster_size - 1)) { + fprintf(stderr, "ERROR offset=%" PRIx64 ": Cluster is not " + "properly aligned; L2 entry corrupted.\n", offset); + errors++; + } } } } @@ -2734,6 +2741,13 @@ static int check_refcounts_l1(BlockDriverState *bs, l2_offset, s->cluster_size); + /* L2 tables are cluster aligned */ + if (l2_offset & (s->cluster_size - 1)) { + fprintf(stderr, "ERROR l2_offset=%" PRIx64 ": Table is not " + "cluster aligned; L1 entry corrupted\n", l2_offset); + errors++; + } + /* Process and check L2 entries */ ret = check_refcounts_l2(bs, refcount_table, refcount_table_size, l2_offset, check_copied); |