mirror of https://github.com/xqemu/xqemu.git
qcow2: Check L1 table parameters in qcow2_expand_zero_clusters()
This function iterates over all snapshots of a qcow2 file in order to expand all zero clusters, but it does not validate the snapshots' L1 tables first. We now have a function to take care of this, so let's use it. We can also take the opportunity to replace the sector-based bdrv_read() with bdrv_pread(). Cc: Eric Blake <eblake@redhat.com> Signed-off-by: Alberto Garcia <berto@igalia.com> Reviewed-by: Eric Blake <eblake@redhat.com> Signed-off-by: Kevin Wolf <kwolf@redhat.com>
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314e8d3928
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c9a442e450
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@ -25,6 +25,7 @@
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#include "qemu/osdep.h"
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#include "qemu/osdep.h"
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#include <zlib.h>
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#include <zlib.h>
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#include "qapi/error.h"
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#include "qemu-common.h"
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#include "qemu-common.h"
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#include "block/block_int.h"
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#include "block/block_int.h"
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#include "block/qcow2.h"
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#include "block/qcow2.h"
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@ -2092,11 +2093,21 @@ int qcow2_expand_zero_clusters(BlockDriverState *bs,
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}
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}
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for (i = 0; i < s->nb_snapshots; i++) {
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for (i = 0; i < s->nb_snapshots; i++) {
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int l1_sectors = DIV_ROUND_UP(s->snapshots[i].l1_size *
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int l1_size2;
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sizeof(uint64_t), BDRV_SECTOR_SIZE);
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uint64_t *new_l1_table;
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Error *local_err = NULL;
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uint64_t *new_l1_table =
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ret = qcow2_validate_table(bs, s->snapshots[i].l1_table_offset,
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g_try_realloc(l1_table, l1_sectors * BDRV_SECTOR_SIZE);
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s->snapshots[i].l1_size, sizeof(uint64_t),
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QCOW_MAX_L1_SIZE, "Snapshot L1 table",
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&local_err);
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if (ret < 0) {
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error_report_err(local_err);
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goto fail;
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}
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l1_size2 = s->snapshots[i].l1_size * sizeof(uint64_t);
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new_l1_table = g_try_realloc(l1_table, l1_size2);
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if (!new_l1_table) {
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if (!new_l1_table) {
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ret = -ENOMEM;
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ret = -ENOMEM;
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@ -2105,9 +2116,8 @@ int qcow2_expand_zero_clusters(BlockDriverState *bs,
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l1_table = new_l1_table;
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l1_table = new_l1_table;
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ret = bdrv_read(bs->file,
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ret = bdrv_pread(bs->file, s->snapshots[i].l1_table_offset,
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s->snapshots[i].l1_table_offset / BDRV_SECTOR_SIZE,
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l1_table, l1_size2);
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(void *)l1_table, l1_sectors);
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if (ret < 0) {
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if (ret < 0) {
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goto fail;
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goto fail;
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}
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}
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@ -177,6 +177,7 @@ _make_test_img 64M
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{ $QEMU_IMG snapshot -c test $TEST_IMG; } 2>&1 | _filter_testdir
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{ $QEMU_IMG snapshot -c test $TEST_IMG; } 2>&1 | _filter_testdir
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poke_file "$TEST_IMG" "$offset_snap1_l1_offset" "\x00\x00\x00\x00\x00\x40\x02\x00"
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poke_file "$TEST_IMG" "$offset_snap1_l1_offset" "\x00\x00\x00\x00\x00\x40\x02\x00"
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{ $QEMU_IMG convert -s test $TEST_IMG $TEST_IMG.snap; } 2>&1 | _filter_testdir
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{ $QEMU_IMG convert -s test $TEST_IMG $TEST_IMG.snap; } 2>&1 | _filter_testdir
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{ $QEMU_IMG amend -o compat=0.10 $TEST_IMG; } 2>&1 | _filter_testdir
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echo
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echo
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echo "== Invalid snapshot L1 table size =="
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echo "== Invalid snapshot L1 table size =="
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@ -185,6 +186,7 @@ _make_test_img 64M
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{ $QEMU_IMG snapshot -c test $TEST_IMG; } 2>&1 | _filter_testdir
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{ $QEMU_IMG snapshot -c test $TEST_IMG; } 2>&1 | _filter_testdir
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poke_file "$TEST_IMG" "$offset_snap1_l1_size" "\x10\x00\x00\x00"
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poke_file "$TEST_IMG" "$offset_snap1_l1_size" "\x10\x00\x00\x00"
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{ $QEMU_IMG convert -s test $TEST_IMG $TEST_IMG.snap; } 2>&1 | _filter_testdir
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{ $QEMU_IMG convert -s test $TEST_IMG $TEST_IMG.snap; } 2>&1 | _filter_testdir
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{ $QEMU_IMG amend -o compat=0.10 $TEST_IMG; } 2>&1 | _filter_testdir
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# success, all done
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# success, all done
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echo "*** done"
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echo "*** done"
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@ -64,10 +64,14 @@ Formatting 'TEST_DIR/t.IMGFMT', fmt=IMGFMT size=67108864
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wrote 512/512 bytes at offset 0
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wrote 512/512 bytes at offset 0
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512 bytes, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
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512 bytes, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
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qemu-img: Failed to load snapshot: Snapshot L1 table offset invalid
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qemu-img: Failed to load snapshot: Snapshot L1 table offset invalid
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qemu-img: Snapshot L1 table offset invalid
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qemu-img: Error while amending options: Invalid argument
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== Invalid snapshot L1 table size ==
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== Invalid snapshot L1 table size ==
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Formatting 'TEST_DIR/t.IMGFMT', fmt=IMGFMT size=67108864
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Formatting 'TEST_DIR/t.IMGFMT', fmt=IMGFMT size=67108864
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wrote 512/512 bytes at offset 0
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wrote 512/512 bytes at offset 0
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512 bytes, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
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512 bytes, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
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qemu-img: Failed to load snapshot: Snapshot L1 table too large
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qemu-img: Failed to load snapshot: Snapshot L1 table too large
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qemu-img: Snapshot L1 table too large
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qemu-img: Error while amending options: File too large
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*** done
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*** done
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