#include "block/block_int.h"
#include "block/qcow2.h"
-typedef struct QEMU_PACKED QCowSnapshotHeader {
- /* header is 8 byte aligned */
- uint64_t l1_table_offset;
-
- uint32_t l1_size;
- uint16_t id_str_size;
- uint16_t name_size;
-
- uint32_t date_sec;
- uint32_t date_nsec;
-
- uint64_t vm_clock_nsec;
-
- uint32_t vm_state_size;
- uint32_t extra_data_size; /* for extension */
- /* extra data follows */
- /* id_str follows */
- /* name follows */
-} QCowSnapshotHeader;
-
-typedef struct QEMU_PACKED QCowSnapshotExtraData {
- uint64_t vm_state_size_large;
- uint64_t disk_size;
-} QCowSnapshotExtraData;
-
void qcow2_free_snapshots(BlockDriverState *bs)
{
BDRVQcowState *s = bs->opaque;
}
offset += name_size;
sn->name[name_size] = '\0';
+
+ if (offset - s->snapshots_offset > QCOW_MAX_SNAPSHOTS_SIZE) {
+ ret = -EFBIG;
+ goto fail;
+ }
}
+ assert(offset - s->snapshots_offset <= INT_MAX);
s->snapshots_size = offset - s->snapshots_offset;
return 0;
uint32_t nb_snapshots;
uint64_t snapshots_offset;
} QEMU_PACKED header_data;
- int64_t offset, snapshots_offset;
+ int64_t offset, snapshots_offset = 0;
int ret;
/* compute the size of the snapshots */
offset += sizeof(extra);
offset += strlen(sn->id_str);
offset += strlen(sn->name);
+
+ if (offset > QCOW_MAX_SNAPSHOTS_SIZE) {
+ ret = -EFBIG;
+ goto fail;
+ }
}
+
+ assert(offset <= INT_MAX);
snapshots_size = offset;
/* Allocate space for the new snapshot list */
snapshots_offset = qcow2_alloc_clusters(bs, snapshots_size);
offset = snapshots_offset;
if (offset < 0) {
- return offset;
+ ret = offset;
+ goto fail;
}
ret = bdrv_flush(bs);
if (ret < 0) {
- return ret;
+ goto fail;
}
/* The snapshot list position has not yet been updated, so these clusters
* must indeed be completely free */
- ret = qcow2_pre_write_overlap_check(bs, QCOW2_OL_DEFAULT, offset,
- s->snapshots_size);
+ ret = qcow2_pre_write_overlap_check(bs, 0, offset, snapshots_size);
if (ret < 0) {
- return ret;
+ goto fail;
}
id_str_size = strlen(sn->id_str);
name_size = strlen(sn->name);
+ assert(id_str_size <= UINT16_MAX && name_size <= UINT16_MAX);
h.id_str_size = cpu_to_be16(id_str_size);
h.name_size = cpu_to_be16(name_size);
offset = align_offset(offset, 8);
return 0;
fail:
+ if (snapshots_offset > 0) {
+ qcow2_free_clusters(bs, snapshots_offset, snapshots_size,
+ QCOW2_DISCARD_ALWAYS);
+ }
return ret;
}
{
BDRVQcowState *s = bs->opaque;
QCowSnapshot *sn;
- int i, id, id_max = 0;
+ int i;
+ unsigned long id, id_max = 0;
for(i = 0; i < s->nb_snapshots; i++) {
sn = s->snapshots + i;
if (id > id_max)
id_max = id;
}
- snprintf(id_str, id_str_size, "%d", id_max + 1);
+ snprintf(id_str, id_str_size, "%lu", id_max + 1);
}
static int find_snapshot_by_id_and_name(BlockDriverState *bs,
uint64_t *l1_table = NULL;
int64_t l1_table_offset;
+ if (s->nb_snapshots >= QCOW_MAX_SNAPSHOTS) {
+ return -EFBIG;
+ }
+
memset(sn, 0, sizeof(*sn));
/* Generate an ID if it wasn't passed */
l1_table[i] = cpu_to_be64(s->l1_table[i]);
}
- ret = qcow2_pre_write_overlap_check(bs, QCOW2_OL_DEFAULT,
- sn->l1_table_offset, s->l1_size * sizeof(uint64_t));
+ ret = qcow2_pre_write_overlap_check(bs, 0, sn->l1_table_offset,
+ s->l1_size * sizeof(uint64_t));
if (ret < 0) {
goto fail;
}
if (ret < 0) {
g_free(s->snapshots);
s->snapshots = old_snapshot_list;
+ s->nb_snapshots--;
goto fail;
}
goto fail;
}
- ret = qcow2_pre_write_overlap_check(bs,
- QCOW2_OL_DEFAULT & ~QCOW2_OL_ACTIVE_L1,
- s->l1_table_offset, cur_l1_bytes);
+ ret = qcow2_pre_write_overlap_check(bs, QCOW2_OL_ACTIVE_L1,
+ s->l1_table_offset, cur_l1_bytes);
if (ret < 0) {
goto fail;
}
s->nb_snapshots--;
ret = qcow2_write_snapshots(bs);
if (ret < 0) {
- error_setg(errp, "Failed to remove snapshot from snapshot list");
+ error_setg_errno(errp, -ret,
+ "Failed to remove snapshot from snapshot list");
return ret;
}
ret = qcow2_update_snapshot_refcount(bs, sn.l1_table_offset,
sn.l1_size, -1);
if (ret < 0) {
- error_setg(errp, "Failed to free the cluster and L1 table");
+ error_setg_errno(errp, -ret, "Failed to free the cluster and L1 table");
return ret;
}
qcow2_free_clusters(bs, sn.l1_table_offset, sn.l1_size * sizeof(uint64_t),
/* must update the copied flag on the current cluster offsets */
ret = qcow2_update_snapshot_refcount(bs, s->l1_table_offset, s->l1_size, 0);
if (ret < 0) {
- error_setg(errp, "Failed to update snapshot status in disk");
+ error_setg_errno(errp, -ret,
+ "Failed to update snapshot status in disk");
return ret;
}
return s->nb_snapshots;
}
-int qcow2_snapshot_load_tmp(BlockDriverState *bs, const char *snapshot_name)
+int qcow2_snapshot_load_tmp(BlockDriverState *bs,
+ const char *snapshot_id,
+ const char *name,
+ Error **errp)
{
int i, snapshot_index;
BDRVQcowState *s = bs->opaque;
assert(bs->read_only);
/* Search the snapshot */
- snapshot_index = find_snapshot_by_id_or_name(bs, snapshot_name);
+ snapshot_index = find_snapshot_by_id_and_name(bs, snapshot_id, name);
if (snapshot_index < 0) {
+ error_setg(errp,
+ "Can't find snapshot");
return -ENOENT;
}
sn = &s->snapshots[snapshot_index];
/* Allocate and read in the snapshot's L1 table */
- new_l1_bytes = s->l1_size * sizeof(uint64_t);
+ if (sn->l1_size > QCOW_MAX_L1_SIZE) {
+ error_setg(errp, "Snapshot L1 table too large");
+ return -EFBIG;
+ }
+ new_l1_bytes = sn->l1_size * sizeof(uint64_t);
new_l1_table = g_malloc0(align_offset(new_l1_bytes, 512));
ret = bdrv_pread(bs->file, sn->l1_table_offset, new_l1_table, new_l1_bytes);
if (ret < 0) {
+ error_setg(errp, "Failed to read l1 table for snapshot");
g_free(new_l1_table);
return ret;
}
projects / qemu.git / blobdiff