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https://github.com/edk2-porting/linux-next.git
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btrfs: tree-checker: Add EXTENT_ITEM and METADATA_ITEM check
This patch introduces the ability to check extent items. This check involves: - key->objectid check Basic alignment check. - key->type check Against btrfs_extent_item::type and SKINNY_METADATA feature. - key->offset alignment check for EXTENT_ITEM - key->offset check for METADATA_ITEM - item size check Both against minimal size and stepping check. - btrfs_extent_item check Checks its flags and generation. - btrfs_extent_inline_ref checks Against 4 types inline ref. Checks bytenr alignment and tree level. - btrfs_extent_item::refs check Check against total refs found in inline refs. This check would be the most complex single item check due to its nature of inlined items. Signed-off-by: Qu Wenruo <wqu@suse.com> Reviewed-by: David Sterba <dsterba@suse.com> Signed-off-by: David Sterba <dsterba@suse.com>
This commit is contained in:
Qu Wenruo
David Sterba
parent
f11369897e
commit
f82d1c7ca8
@ -910,6 +910,250 @@ static int check_root_item(struct extent_buffer *leaf, struct btrfs_key *key,
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return 0;
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}
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__printf(3,4)
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__cold
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static void extent_err(const struct extent_buffer *eb, int slot,
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const char *fmt, ...)
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{
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struct btrfs_key key;
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struct va_format vaf;
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va_list args;
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u64 bytenr;
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u64 len;
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btrfs_item_key_to_cpu(eb, &key, slot);
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bytenr = key.objectid;
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if (key.type == BTRFS_METADATA_ITEM_KEY)
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len = eb->fs_info->nodesize;
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else
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len = key.offset;
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va_start(args, fmt);
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vaf.fmt = fmt;
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vaf.va = &args;
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btrfs_crit(eb->fs_info,
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"corrupt %s: block=%llu slot=%d extent bytenr=%llu len=%llu %pV",
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btrfs_header_level(eb) == 0 ? "leaf" : "node",
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eb->start, slot, bytenr, len, &vaf);
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va_end(args);
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}
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static int check_extent_item(struct extent_buffer *leaf,
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struct btrfs_key *key, int slot)
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{
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struct btrfs_fs_info *fs_info = leaf->fs_info;
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struct btrfs_extent_item *ei;
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bool is_tree_block = false;
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unsigned long ptr; /* Current pointer inside inline refs */
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unsigned long end; /* Extent item end */
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const u32 item_size = btrfs_item_size_nr(leaf, slot);
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u64 flags;
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u64 generation;
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u64 total_refs; /* Total refs in btrfs_extent_item */
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u64 inline_refs = 0; /* found total inline refs */
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if (key->type == BTRFS_METADATA_ITEM_KEY &&
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!btrfs_fs_incompat(fs_info, SKINNY_METADATA)) {
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generic_err(leaf, slot,
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"invalid key type, METADATA_ITEM type invalid when SKINNY_METADATA feature disabled");
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return -EUCLEAN;
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}
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/* key->objectid is the bytenr for both key types */
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if (!IS_ALIGNED(key->objectid, fs_info->sectorsize)) {
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generic_err(leaf, slot,
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"invalid key objectid, have %llu expect to be aligned to %u",
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key->objectid, fs_info->sectorsize);
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return -EUCLEAN;
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}
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/* key->offset is tree level for METADATA_ITEM_KEY */
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if (key->type == BTRFS_METADATA_ITEM_KEY &&
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key->offset >= BTRFS_MAX_LEVEL) {
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extent_err(leaf, slot,
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"invalid tree level, have %llu expect [0, %u]",
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key->offset, BTRFS_MAX_LEVEL - 1);
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return -EUCLEAN;
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}
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/*
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* EXTENT/METADATA_ITEM consists of:
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* 1) One btrfs_extent_item
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* Records the total refs, type and generation of the extent.
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*
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* 2) One btrfs_tree_block_info (for EXTENT_ITEM and tree backref only)
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* Records the first key and level of the tree block.
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*
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* 2) Zero or more btrfs_extent_inline_ref(s)
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* Each inline ref has one btrfs_extent_inline_ref shows:
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* 2.1) The ref type, one of the 4
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* TREE_BLOCK_REF Tree block only
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* SHARED_BLOCK_REF Tree block only
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* EXTENT_DATA_REF Data only
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* SHARED_DATA_REF Data only
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* 2.2) Ref type specific data
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* Either using btrfs_extent_inline_ref::offset, or specific
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* data structure.
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*/
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if (item_size < sizeof(*ei)) {
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extent_err(leaf, slot,
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"invalid item size, have %u expect [%zu, %u)",
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item_size, sizeof(*ei),
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BTRFS_LEAF_DATA_SIZE(fs_info));
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return -EUCLEAN;
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}
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end = item_size + btrfs_item_ptr_offset(leaf, slot);
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/* Checks against extent_item */
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ei = btrfs_item_ptr(leaf, slot, struct btrfs_extent_item);
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flags = btrfs_extent_flags(leaf, ei);
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total_refs = btrfs_extent_refs(leaf, ei);
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generation = btrfs_extent_generation(leaf, ei);
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if (generation > btrfs_super_generation(fs_info->super_copy) + 1) {
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extent_err(leaf, slot,
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"invalid generation, have %llu expect (0, %llu]",
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generation,
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btrfs_super_generation(fs_info->super_copy) + 1);
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return -EUCLEAN;
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}
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if (!is_power_of_2(flags & (BTRFS_EXTENT_FLAG_DATA |
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BTRFS_EXTENT_FLAG_TREE_BLOCK))) {
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extent_err(leaf, slot,
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"invalid extent flag, have 0x%llx expect 1 bit set in 0x%llx",
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flags, BTRFS_EXTENT_FLAG_DATA |
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BTRFS_EXTENT_FLAG_TREE_BLOCK);
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return -EUCLEAN;
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}
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is_tree_block = !!(flags & BTRFS_EXTENT_FLAG_TREE_BLOCK);
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if (is_tree_block) {
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if (key->type == BTRFS_EXTENT_ITEM_KEY &&
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key->offset != fs_info->nodesize) {
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extent_err(leaf, slot,
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"invalid extent length, have %llu expect %u",
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key->offset, fs_info->nodesize);
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return -EUCLEAN;
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}
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} else {
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if (key->type != BTRFS_EXTENT_ITEM_KEY) {
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extent_err(leaf, slot,
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"invalid key type, have %u expect %u for data backref",
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key->type, BTRFS_EXTENT_ITEM_KEY);
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return -EUCLEAN;
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}
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if (!IS_ALIGNED(key->offset, fs_info->sectorsize)) {
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extent_err(leaf, slot,
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"invalid extent length, have %llu expect aligned to %u",
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key->offset, fs_info->sectorsize);
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return -EUCLEAN;
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}
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}
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ptr = (unsigned long)(struct btrfs_extent_item *)(ei + 1);
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/* Check the special case of btrfs_tree_block_info */
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if (is_tree_block && key->type != BTRFS_METADATA_ITEM_KEY) {
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struct btrfs_tree_block_info *info;
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info = (struct btrfs_tree_block_info *)ptr;
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if (btrfs_tree_block_level(leaf, info) >= BTRFS_MAX_LEVEL) {
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extent_err(leaf, slot,
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"invalid tree block info level, have %u expect [0, %u]",
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btrfs_tree_block_level(leaf, info),
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BTRFS_MAX_LEVEL - 1);
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return -EUCLEAN;
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}
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ptr = (unsigned long)(struct btrfs_tree_block_info *)(info + 1);
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}
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/* Check inline refs */
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while (ptr < end) {
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struct btrfs_extent_inline_ref *iref;
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struct btrfs_extent_data_ref *dref;
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struct btrfs_shared_data_ref *sref;
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u64 dref_offset;
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u64 inline_offset;
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u8 inline_type;
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if (ptr + sizeof(*iref) > end) {
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extent_err(leaf, slot,
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"inline ref item overflows extent item, ptr %lu iref size %zu end %lu",
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ptr, sizeof(*iref), end);
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return -EUCLEAN;
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}
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iref = (struct btrfs_extent_inline_ref *)ptr;
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inline_type = btrfs_extent_inline_ref_type(leaf, iref);
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inline_offset = btrfs_extent_inline_ref_offset(leaf, iref);
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if (ptr + btrfs_extent_inline_ref_size(inline_type) > end) {
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extent_err(leaf, slot,
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"inline ref item overflows extent item, ptr %lu iref size %u end %lu",
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ptr, inline_type, end);
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return -EUCLEAN;
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}
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switch (inline_type) {
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/* inline_offset is subvolid of the owner, no need to check */
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case BTRFS_TREE_BLOCK_REF_KEY:
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inline_refs++;
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break;
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/* Contains parent bytenr */
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case BTRFS_SHARED_BLOCK_REF_KEY:
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if (!IS_ALIGNED(inline_offset, fs_info->sectorsize)) {
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extent_err(leaf, slot,
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"invalid tree parent bytenr, have %llu expect aligned to %u",
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inline_offset, fs_info->sectorsize);
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return -EUCLEAN;
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}
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inline_refs++;
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break;
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/*
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* Contains owner subvolid, owner key objectid, adjusted offset.
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* The only obvious corruption can happen in that offset.
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*/
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case BTRFS_EXTENT_DATA_REF_KEY:
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dref = (struct btrfs_extent_data_ref *)(&iref->offset);
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dref_offset = btrfs_extent_data_ref_offset(leaf, dref);
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if (!IS_ALIGNED(dref_offset, fs_info->sectorsize)) {
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extent_err(leaf, slot,
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"invalid data ref offset, have %llu expect aligned to %u",
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dref_offset, fs_info->sectorsize);
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return -EUCLEAN;
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}
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inline_refs += btrfs_extent_data_ref_count(leaf, dref);
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break;
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/* Contains parent bytenr and ref count */
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case BTRFS_SHARED_DATA_REF_KEY:
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sref = (struct btrfs_shared_data_ref *)(iref + 1);
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if (!IS_ALIGNED(inline_offset, fs_info->sectorsize)) {
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extent_err(leaf, slot,
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"invalid data parent bytenr, have %llu expect aligned to %u",
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inline_offset, fs_info->sectorsize);
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return -EUCLEAN;
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}
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inline_refs += btrfs_shared_data_ref_count(leaf, sref);
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break;
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default:
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extent_err(leaf, slot, "unknown inline ref type: %u",
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inline_type);
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return -EUCLEAN;
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}
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ptr += btrfs_extent_inline_ref_size(inline_type);
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}
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/* No padding is allowed */
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if (ptr != end) {
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extent_err(leaf, slot,
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"invalid extent item size, padding bytes found");
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return -EUCLEAN;
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}
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/* Finally, check the inline refs against total refs */
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if (inline_refs > total_refs) {
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extent_err(leaf, slot,
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"invalid extent refs, have %llu expect >= inline %llu",
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total_refs, inline_refs);
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return -EUCLEAN;
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}
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return 0;
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}
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/*
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* Common point to switch the item-specific validation.
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*/
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@ -948,6 +1192,10 @@ static int check_leaf_item(struct extent_buffer *leaf,
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case BTRFS_ROOT_ITEM_KEY:
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ret = check_root_item(leaf, key, slot);
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break;
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case BTRFS_EXTENT_ITEM_KEY:
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case BTRFS_METADATA_ITEM_KEY:
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ret = check_extent_item(leaf, key, slot);
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break;
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}
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return ret;
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}
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