Esempio n. 1
0
static void dump_path(const char *tag, struct ext2_extent_handle *handle,
		      struct extent_path *path)
{
	struct extent_path *ppp = path;
	printf("%s: level=%d\n", tag, handle->level);

	do {
		printf("%s: path=%ld buf=%p entries=%d max_entries=%d left=%d "
		       "visit_num=%d flags=0x%x end_blk=%llu curr=%p(%ld)\n",
		       tag, (ppp - handle->path), ppp->buf, ppp->entries,
		       ppp->max_entries, ppp->left, ppp->visit_num, ppp->flags,
		       ppp->end_blk, ppp->curr, ppp->curr - (void *)ppp->buf);
		printf("  ");
		dbg_show_header((struct ext3_extent_header *)ppp->buf);
		if (ppp->curr) {
			printf("  ");
			dbg_show_index(ppp->curr);
			printf("  ");
			dbg_show_extent(ppp->curr);
		}
		ppp--;
	} while (ppp >= handle->path);
	fflush(stdout);

	return;
}
Esempio n. 2
0
errcode_t ext2fs_extent_header_verify(void *ptr, int size)
{
	int eh_max, entry_size;
	struct ext3_extent_header *eh = ptr;

	dbg_show_header(eh);
	if (ext2fs_le16_to_cpu(eh->eh_magic) != EXT3_EXT_MAGIC)
		return EXT2_ET_EXTENT_HEADER_BAD;
	if (ext2fs_le16_to_cpu(eh->eh_entries) > ext2fs_le16_to_cpu(eh->eh_max))
		return EXT2_ET_EXTENT_HEADER_BAD;
	if (eh->eh_depth == 0)
		entry_size = sizeof(struct ext3_extent);
	else
		entry_size = sizeof(struct ext3_extent_idx);

	eh_max = (size - sizeof(*eh)) / entry_size;
	if ((ext2fs_le16_to_cpu(eh->eh_max) > eh_max) ||
	    (ext2fs_le16_to_cpu(eh->eh_max) < (eh_max - 2)))
		return EXT2_ET_EXTENT_HEADER_BAD;

	return 0;
}
/*
 * Verify the extent header as being sane
 */
errcode_t ext2fs_extent_header_verify(void *ptr, int size)
{
	int eh_max, entry_size;
	struct ext3_extent_header *eh = ptr;

	dbg_show_header(eh);
	if (ext2fs_le16_to_cpu(eh->eh_magic) != EXT3_EXT_MAGIC)
		return EXT2_ET_EXTENT_HEADER_BAD;
	if (ext2fs_le16_to_cpu(eh->eh_entries) > ext2fs_le16_to_cpu(eh->eh_max))
		return EXT2_ET_EXTENT_HEADER_BAD;
	if (eh->eh_depth == 0)
		entry_size = sizeof(struct ext3_extent);
	else
		entry_size = sizeof(struct ext3_extent_idx);

	eh_max = (size - sizeof(*eh)) / entry_size;
	/* Allow two extent-sized items at the end of the block, for
	 * ext4_extent_tail with checksum in the future. */
	if ((ext2fs_le16_to_cpu(eh->eh_max) > eh_max) ||
	    (ext2fs_le16_to_cpu(eh->eh_max) < (eh_max - 2)))
		return EXT2_ET_EXTENT_HEADER_BAD;

	return 0;
}