1934 строки
58 KiB
C
1934 строки
58 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/*
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* Copyright (C) Qu Wenruo 2017. All rights reserved.
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*/
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/*
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* The module is used to catch unexpected/corrupted tree block data.
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* Such behavior can be caused either by a fuzzed image or bugs.
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*
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* The objective is to do leaf/node validation checks when tree block is read
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* from disk, and check *every* possible member, so other code won't
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* need to checking them again.
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*
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* Due to the potential and unwanted damage, every checker needs to be
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* carefully reviewed otherwise so it does not prevent mount of valid images.
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*/
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#include <linux/types.h>
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#include <linux/stddef.h>
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#include <linux/error-injection.h>
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#include "ctree.h"
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#include "tree-checker.h"
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#include "disk-io.h"
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#include "compression.h"
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#include "volumes.h"
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#include "misc.h"
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#include "btrfs_inode.h"
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/*
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* Error message should follow the following format:
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* corrupt <type>: <identifier>, <reason>[, <bad_value>]
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*
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* @type: leaf or node
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* @identifier: the necessary info to locate the leaf/node.
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* It's recommended to decode key.objecitd/offset if it's
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* meaningful.
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* @reason: describe the error
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* @bad_value: optional, it's recommended to output bad value and its
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* expected value (range).
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*
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* Since comma is used to separate the components, only space is allowed
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* inside each component.
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*/
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/*
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* Append generic "corrupt leaf/node root=%llu block=%llu slot=%d: " to @fmt.
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* Allows callers to customize the output.
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*/
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__printf(3, 4)
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__cold
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static void generic_err(const struct extent_buffer *eb, int slot,
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const char *fmt, ...)
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{
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const struct btrfs_fs_info *fs_info = eb->fs_info;
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struct va_format vaf;
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va_list args;
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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(fs_info,
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"corrupt %s: root=%llu block=%llu slot=%d, %pV",
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btrfs_header_level(eb) == 0 ? "leaf" : "node",
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btrfs_header_owner(eb), btrfs_header_bytenr(eb), slot, &vaf);
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va_end(args);
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}
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/*
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* Customized reporter for extent data item, since its key objectid and
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* offset has its own meaning.
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*/
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__printf(3, 4)
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__cold
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static void file_extent_err(const struct extent_buffer *eb, int slot,
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const char *fmt, ...)
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{
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const struct btrfs_fs_info *fs_info = eb->fs_info;
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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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btrfs_item_key_to_cpu(eb, &key, slot);
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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(fs_info,
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"corrupt %s: root=%llu block=%llu slot=%d ino=%llu file_offset=%llu, %pV",
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btrfs_header_level(eb) == 0 ? "leaf" : "node",
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btrfs_header_owner(eb), btrfs_header_bytenr(eb), slot,
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key.objectid, key.offset, &vaf);
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va_end(args);
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}
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/*
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* Return 0 if the btrfs_file_extent_##name is aligned to @alignment
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* Else return 1
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*/
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#define CHECK_FE_ALIGNED(leaf, slot, fi, name, alignment) \
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({ \
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if (unlikely(!IS_ALIGNED(btrfs_file_extent_##name((leaf), (fi)), \
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(alignment)))) \
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file_extent_err((leaf), (slot), \
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"invalid %s for file extent, have %llu, should be aligned to %u", \
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(#name), btrfs_file_extent_##name((leaf), (fi)), \
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(alignment)); \
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(!IS_ALIGNED(btrfs_file_extent_##name((leaf), (fi)), (alignment))); \
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})
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static u64 file_extent_end(struct extent_buffer *leaf,
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struct btrfs_key *key,
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struct btrfs_file_extent_item *extent)
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{
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u64 end;
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u64 len;
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if (btrfs_file_extent_type(leaf, extent) == BTRFS_FILE_EXTENT_INLINE) {
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len = btrfs_file_extent_ram_bytes(leaf, extent);
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end = ALIGN(key->offset + len, leaf->fs_info->sectorsize);
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} else {
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len = btrfs_file_extent_num_bytes(leaf, extent);
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end = key->offset + len;
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}
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return end;
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}
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/*
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* Customized report for dir_item, the only new important information is
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* key->objectid, which represents inode number
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*/
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__printf(3, 4)
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__cold
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static void dir_item_err(const struct extent_buffer *eb, int slot,
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const char *fmt, ...)
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{
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const struct btrfs_fs_info *fs_info = eb->fs_info;
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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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btrfs_item_key_to_cpu(eb, &key, slot);
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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(fs_info,
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"corrupt %s: root=%llu block=%llu slot=%d ino=%llu, %pV",
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btrfs_header_level(eb) == 0 ? "leaf" : "node",
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btrfs_header_owner(eb), btrfs_header_bytenr(eb), slot,
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key.objectid, &vaf);
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va_end(args);
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}
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/*
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* This functions checks prev_key->objectid, to ensure current key and prev_key
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* share the same objectid as inode number.
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*
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* This is to detect missing INODE_ITEM in subvolume trees.
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*
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* Return true if everything is OK or we don't need to check.
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* Return false if anything is wrong.
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*/
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static bool check_prev_ino(struct extent_buffer *leaf,
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struct btrfs_key *key, int slot,
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struct btrfs_key *prev_key)
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{
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/* No prev key, skip check */
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if (slot == 0)
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return true;
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/* Only these key->types needs to be checked */
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ASSERT(key->type == BTRFS_XATTR_ITEM_KEY ||
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key->type == BTRFS_INODE_REF_KEY ||
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key->type == BTRFS_DIR_INDEX_KEY ||
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key->type == BTRFS_DIR_ITEM_KEY ||
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key->type == BTRFS_EXTENT_DATA_KEY);
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/*
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* Only subvolume trees along with their reloc trees need this check.
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* Things like log tree doesn't follow this ino requirement.
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*/
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if (!is_fstree(btrfs_header_owner(leaf)))
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return true;
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if (key->objectid == prev_key->objectid)
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return true;
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/* Error found */
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dir_item_err(leaf, slot,
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"invalid previous key objectid, have %llu expect %llu",
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prev_key->objectid, key->objectid);
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return false;
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}
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static int check_extent_data_item(struct extent_buffer *leaf,
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struct btrfs_key *key, int slot,
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struct btrfs_key *prev_key)
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{
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struct btrfs_fs_info *fs_info = leaf->fs_info;
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struct btrfs_file_extent_item *fi;
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u32 sectorsize = fs_info->sectorsize;
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u32 item_size = btrfs_item_size(leaf, slot);
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u64 extent_end;
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if (unlikely(!IS_ALIGNED(key->offset, sectorsize))) {
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file_extent_err(leaf, slot,
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"unaligned file_offset for file extent, have %llu should be aligned to %u",
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key->offset, sectorsize);
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return -EUCLEAN;
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}
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/*
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* Previous key must have the same key->objectid (ino).
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* It can be XATTR_ITEM, INODE_ITEM or just another EXTENT_DATA.
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* But if objectids mismatch, it means we have a missing
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* INODE_ITEM.
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*/
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if (unlikely(!check_prev_ino(leaf, key, slot, prev_key)))
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return -EUCLEAN;
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fi = btrfs_item_ptr(leaf, slot, struct btrfs_file_extent_item);
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/*
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* Make sure the item contains at least inline header, so the file
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* extent type is not some garbage.
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*/
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if (unlikely(item_size < BTRFS_FILE_EXTENT_INLINE_DATA_START)) {
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file_extent_err(leaf, slot,
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"invalid item size, have %u expect [%zu, %u)",
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item_size, BTRFS_FILE_EXTENT_INLINE_DATA_START,
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SZ_4K);
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return -EUCLEAN;
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}
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if (unlikely(btrfs_file_extent_type(leaf, fi) >=
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BTRFS_NR_FILE_EXTENT_TYPES)) {
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file_extent_err(leaf, slot,
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"invalid type for file extent, have %u expect range [0, %u]",
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btrfs_file_extent_type(leaf, fi),
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BTRFS_NR_FILE_EXTENT_TYPES - 1);
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return -EUCLEAN;
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}
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/*
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* Support for new compression/encryption must introduce incompat flag,
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* and must be caught in open_ctree().
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*/
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if (unlikely(btrfs_file_extent_compression(leaf, fi) >=
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BTRFS_NR_COMPRESS_TYPES)) {
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file_extent_err(leaf, slot,
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"invalid compression for file extent, have %u expect range [0, %u]",
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btrfs_file_extent_compression(leaf, fi),
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BTRFS_NR_COMPRESS_TYPES - 1);
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return -EUCLEAN;
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}
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if (unlikely(btrfs_file_extent_encryption(leaf, fi))) {
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file_extent_err(leaf, slot,
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"invalid encryption for file extent, have %u expect 0",
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btrfs_file_extent_encryption(leaf, fi));
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return -EUCLEAN;
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}
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if (btrfs_file_extent_type(leaf, fi) == BTRFS_FILE_EXTENT_INLINE) {
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/* Inline extent must have 0 as key offset */
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if (unlikely(key->offset)) {
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file_extent_err(leaf, slot,
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"invalid file_offset for inline file extent, have %llu expect 0",
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key->offset);
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return -EUCLEAN;
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}
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/* Compressed inline extent has no on-disk size, skip it */
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if (btrfs_file_extent_compression(leaf, fi) !=
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BTRFS_COMPRESS_NONE)
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return 0;
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/* Uncompressed inline extent size must match item size */
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if (unlikely(item_size != BTRFS_FILE_EXTENT_INLINE_DATA_START +
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btrfs_file_extent_ram_bytes(leaf, fi))) {
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file_extent_err(leaf, slot,
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"invalid ram_bytes for uncompressed inline extent, have %u expect %llu",
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item_size, BTRFS_FILE_EXTENT_INLINE_DATA_START +
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btrfs_file_extent_ram_bytes(leaf, fi));
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return -EUCLEAN;
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}
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return 0;
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}
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/* Regular or preallocated extent has fixed item size */
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if (unlikely(item_size != sizeof(*fi))) {
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file_extent_err(leaf, slot,
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"invalid item size for reg/prealloc file extent, have %u expect %zu",
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item_size, sizeof(*fi));
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return -EUCLEAN;
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}
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if (unlikely(CHECK_FE_ALIGNED(leaf, slot, fi, ram_bytes, sectorsize) ||
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CHECK_FE_ALIGNED(leaf, slot, fi, disk_bytenr, sectorsize) ||
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CHECK_FE_ALIGNED(leaf, slot, fi, disk_num_bytes, sectorsize) ||
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CHECK_FE_ALIGNED(leaf, slot, fi, offset, sectorsize) ||
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CHECK_FE_ALIGNED(leaf, slot, fi, num_bytes, sectorsize)))
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return -EUCLEAN;
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/* Catch extent end overflow */
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if (unlikely(check_add_overflow(btrfs_file_extent_num_bytes(leaf, fi),
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key->offset, &extent_end))) {
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file_extent_err(leaf, slot,
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"extent end overflow, have file offset %llu extent num bytes %llu",
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key->offset,
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btrfs_file_extent_num_bytes(leaf, fi));
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return -EUCLEAN;
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}
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/*
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* Check that no two consecutive file extent items, in the same leaf,
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* present ranges that overlap each other.
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*/
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if (slot > 0 &&
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prev_key->objectid == key->objectid &&
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prev_key->type == BTRFS_EXTENT_DATA_KEY) {
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struct btrfs_file_extent_item *prev_fi;
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u64 prev_end;
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prev_fi = btrfs_item_ptr(leaf, slot - 1,
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struct btrfs_file_extent_item);
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prev_end = file_extent_end(leaf, prev_key, prev_fi);
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if (unlikely(prev_end > key->offset)) {
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file_extent_err(leaf, slot - 1,
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"file extent end range (%llu) goes beyond start offset (%llu) of the next file extent",
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prev_end, key->offset);
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return -EUCLEAN;
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}
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}
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return 0;
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}
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static int check_csum_item(struct extent_buffer *leaf, struct btrfs_key *key,
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int slot, struct btrfs_key *prev_key)
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{
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struct btrfs_fs_info *fs_info = leaf->fs_info;
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u32 sectorsize = fs_info->sectorsize;
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const u32 csumsize = fs_info->csum_size;
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if (unlikely(key->objectid != BTRFS_EXTENT_CSUM_OBJECTID)) {
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generic_err(leaf, slot,
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"invalid key objectid for csum item, have %llu expect %llu",
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key->objectid, BTRFS_EXTENT_CSUM_OBJECTID);
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return -EUCLEAN;
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}
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if (unlikely(!IS_ALIGNED(key->offset, sectorsize))) {
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generic_err(leaf, slot,
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"unaligned key offset for csum item, have %llu should be aligned to %u",
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key->offset, sectorsize);
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return -EUCLEAN;
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}
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if (unlikely(!IS_ALIGNED(btrfs_item_size(leaf, slot), csumsize))) {
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generic_err(leaf, slot,
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"unaligned item size for csum item, have %u should be aligned to %u",
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btrfs_item_size(leaf, slot), csumsize);
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return -EUCLEAN;
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}
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if (slot > 0 && prev_key->type == BTRFS_EXTENT_CSUM_KEY) {
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u64 prev_csum_end;
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u32 prev_item_size;
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prev_item_size = btrfs_item_size(leaf, slot - 1);
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prev_csum_end = (prev_item_size / csumsize) * sectorsize;
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prev_csum_end += prev_key->offset;
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if (unlikely(prev_csum_end > key->offset)) {
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generic_err(leaf, slot - 1,
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"csum end range (%llu) goes beyond the start range (%llu) of the next csum item",
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prev_csum_end, key->offset);
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return -EUCLEAN;
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}
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}
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return 0;
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}
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/* Inode item error output has the same format as dir_item_err() */
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#define inode_item_err(eb, slot, fmt, ...) \
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dir_item_err(eb, slot, fmt, __VA_ARGS__)
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static int check_inode_key(struct extent_buffer *leaf, struct btrfs_key *key,
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int slot)
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{
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struct btrfs_key item_key;
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bool is_inode_item;
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btrfs_item_key_to_cpu(leaf, &item_key, slot);
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is_inode_item = (item_key.type == BTRFS_INODE_ITEM_KEY);
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/* For XATTR_ITEM, location key should be all 0 */
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if (item_key.type == BTRFS_XATTR_ITEM_KEY) {
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if (unlikely(key->objectid != 0 || key->type != 0 ||
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key->offset != 0))
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return -EUCLEAN;
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return 0;
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}
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if (unlikely((key->objectid < BTRFS_FIRST_FREE_OBJECTID ||
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key->objectid > BTRFS_LAST_FREE_OBJECTID) &&
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key->objectid != BTRFS_ROOT_TREE_DIR_OBJECTID &&
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key->objectid != BTRFS_FREE_INO_OBJECTID)) {
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if (is_inode_item) {
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generic_err(leaf, slot,
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"invalid key objectid: has %llu expect %llu or [%llu, %llu] or %llu",
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key->objectid, BTRFS_ROOT_TREE_DIR_OBJECTID,
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BTRFS_FIRST_FREE_OBJECTID,
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BTRFS_LAST_FREE_OBJECTID,
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BTRFS_FREE_INO_OBJECTID);
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} else {
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dir_item_err(leaf, slot,
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"invalid location key objectid: has %llu expect %llu or [%llu, %llu] or %llu",
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key->objectid, BTRFS_ROOT_TREE_DIR_OBJECTID,
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BTRFS_FIRST_FREE_OBJECTID,
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BTRFS_LAST_FREE_OBJECTID,
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BTRFS_FREE_INO_OBJECTID);
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}
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return -EUCLEAN;
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}
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if (unlikely(key->offset != 0)) {
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if (is_inode_item)
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inode_item_err(leaf, slot,
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"invalid key offset: has %llu expect 0",
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key->offset);
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else
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dir_item_err(leaf, slot,
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"invalid location key offset:has %llu expect 0",
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key->offset);
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return -EUCLEAN;
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}
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return 0;
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}
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static int check_root_key(struct extent_buffer *leaf, struct btrfs_key *key,
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int slot)
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{
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struct btrfs_key item_key;
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bool is_root_item;
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btrfs_item_key_to_cpu(leaf, &item_key, slot);
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is_root_item = (item_key.type == BTRFS_ROOT_ITEM_KEY);
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/* No such tree id */
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if (unlikely(key->objectid == 0)) {
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if (is_root_item)
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generic_err(leaf, slot, "invalid root id 0");
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else
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dir_item_err(leaf, slot,
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"invalid location key root id 0");
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return -EUCLEAN;
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}
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/* DIR_ITEM/INDEX/INODE_REF is not allowed to point to non-fs trees */
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if (unlikely(!is_fstree(key->objectid) && !is_root_item)) {
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dir_item_err(leaf, slot,
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"invalid location key objectid, have %llu expect [%llu, %llu]",
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key->objectid, BTRFS_FIRST_FREE_OBJECTID,
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BTRFS_LAST_FREE_OBJECTID);
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return -EUCLEAN;
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}
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/*
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* ROOT_ITEM with non-zero offset means this is a snapshot, created at
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* @offset transid.
|
|
* Furthermore, for location key in DIR_ITEM, its offset is always -1.
|
|
*
|
|
* So here we only check offset for reloc tree whose key->offset must
|
|
* be a valid tree.
|
|
*/
|
|
if (unlikely(key->objectid == BTRFS_TREE_RELOC_OBJECTID &&
|
|
key->offset == 0)) {
|
|
generic_err(leaf, slot, "invalid root id 0 for reloc tree");
|
|
return -EUCLEAN;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
static int check_dir_item(struct extent_buffer *leaf,
|
|
struct btrfs_key *key, struct btrfs_key *prev_key,
|
|
int slot)
|
|
{
|
|
struct btrfs_fs_info *fs_info = leaf->fs_info;
|
|
struct btrfs_dir_item *di;
|
|
u32 item_size = btrfs_item_size(leaf, slot);
|
|
u32 cur = 0;
|
|
|
|
if (unlikely(!check_prev_ino(leaf, key, slot, prev_key)))
|
|
return -EUCLEAN;
|
|
|
|
di = btrfs_item_ptr(leaf, slot, struct btrfs_dir_item);
|
|
while (cur < item_size) {
|
|
struct btrfs_key location_key;
|
|
u32 name_len;
|
|
u32 data_len;
|
|
u32 max_name_len;
|
|
u32 total_size;
|
|
u32 name_hash;
|
|
u8 dir_type;
|
|
int ret;
|
|
|
|
/* header itself should not cross item boundary */
|
|
if (unlikely(cur + sizeof(*di) > item_size)) {
|
|
dir_item_err(leaf, slot,
|
|
"dir item header crosses item boundary, have %zu boundary %u",
|
|
cur + sizeof(*di), item_size);
|
|
return -EUCLEAN;
|
|
}
|
|
|
|
/* Location key check */
|
|
btrfs_dir_item_key_to_cpu(leaf, di, &location_key);
|
|
if (location_key.type == BTRFS_ROOT_ITEM_KEY) {
|
|
ret = check_root_key(leaf, &location_key, slot);
|
|
if (unlikely(ret < 0))
|
|
return ret;
|
|
} else if (location_key.type == BTRFS_INODE_ITEM_KEY ||
|
|
location_key.type == 0) {
|
|
ret = check_inode_key(leaf, &location_key, slot);
|
|
if (unlikely(ret < 0))
|
|
return ret;
|
|
} else {
|
|
dir_item_err(leaf, slot,
|
|
"invalid location key type, have %u, expect %u or %u",
|
|
location_key.type, BTRFS_ROOT_ITEM_KEY,
|
|
BTRFS_INODE_ITEM_KEY);
|
|
return -EUCLEAN;
|
|
}
|
|
|
|
/* dir type check */
|
|
dir_type = btrfs_dir_type(leaf, di);
|
|
if (unlikely(dir_type >= BTRFS_FT_MAX)) {
|
|
dir_item_err(leaf, slot,
|
|
"invalid dir item type, have %u expect [0, %u)",
|
|
dir_type, BTRFS_FT_MAX);
|
|
return -EUCLEAN;
|
|
}
|
|
|
|
if (unlikely(key->type == BTRFS_XATTR_ITEM_KEY &&
|
|
dir_type != BTRFS_FT_XATTR)) {
|
|
dir_item_err(leaf, slot,
|
|
"invalid dir item type for XATTR key, have %u expect %u",
|
|
dir_type, BTRFS_FT_XATTR);
|
|
return -EUCLEAN;
|
|
}
|
|
if (unlikely(dir_type == BTRFS_FT_XATTR &&
|
|
key->type != BTRFS_XATTR_ITEM_KEY)) {
|
|
dir_item_err(leaf, slot,
|
|
"xattr dir type found for non-XATTR key");
|
|
return -EUCLEAN;
|
|
}
|
|
if (dir_type == BTRFS_FT_XATTR)
|
|
max_name_len = XATTR_NAME_MAX;
|
|
else
|
|
max_name_len = BTRFS_NAME_LEN;
|
|
|
|
/* Name/data length check */
|
|
name_len = btrfs_dir_name_len(leaf, di);
|
|
data_len = btrfs_dir_data_len(leaf, di);
|
|
if (unlikely(name_len > max_name_len)) {
|
|
dir_item_err(leaf, slot,
|
|
"dir item name len too long, have %u max %u",
|
|
name_len, max_name_len);
|
|
return -EUCLEAN;
|
|
}
|
|
if (unlikely(name_len + data_len > BTRFS_MAX_XATTR_SIZE(fs_info))) {
|
|
dir_item_err(leaf, slot,
|
|
"dir item name and data len too long, have %u max %u",
|
|
name_len + data_len,
|
|
BTRFS_MAX_XATTR_SIZE(fs_info));
|
|
return -EUCLEAN;
|
|
}
|
|
|
|
if (unlikely(data_len && dir_type != BTRFS_FT_XATTR)) {
|
|
dir_item_err(leaf, slot,
|
|
"dir item with invalid data len, have %u expect 0",
|
|
data_len);
|
|
return -EUCLEAN;
|
|
}
|
|
|
|
total_size = sizeof(*di) + name_len + data_len;
|
|
|
|
/* header and name/data should not cross item boundary */
|
|
if (unlikely(cur + total_size > item_size)) {
|
|
dir_item_err(leaf, slot,
|
|
"dir item data crosses item boundary, have %u boundary %u",
|
|
cur + total_size, item_size);
|
|
return -EUCLEAN;
|
|
}
|
|
|
|
/*
|
|
* Special check for XATTR/DIR_ITEM, as key->offset is name
|
|
* hash, should match its name
|
|
*/
|
|
if (key->type == BTRFS_DIR_ITEM_KEY ||
|
|
key->type == BTRFS_XATTR_ITEM_KEY) {
|
|
char namebuf[max(BTRFS_NAME_LEN, XATTR_NAME_MAX)];
|
|
|
|
read_extent_buffer(leaf, namebuf,
|
|
(unsigned long)(di + 1), name_len);
|
|
name_hash = btrfs_name_hash(namebuf, name_len);
|
|
if (unlikely(key->offset != name_hash)) {
|
|
dir_item_err(leaf, slot,
|
|
"name hash mismatch with key, have 0x%016x expect 0x%016llx",
|
|
name_hash, key->offset);
|
|
return -EUCLEAN;
|
|
}
|
|
}
|
|
cur += total_size;
|
|
di = (struct btrfs_dir_item *)((void *)di + total_size);
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
__printf(3, 4)
|
|
__cold
|
|
static void block_group_err(const struct extent_buffer *eb, int slot,
|
|
const char *fmt, ...)
|
|
{
|
|
const struct btrfs_fs_info *fs_info = eb->fs_info;
|
|
struct btrfs_key key;
|
|
struct va_format vaf;
|
|
va_list args;
|
|
|
|
btrfs_item_key_to_cpu(eb, &key, slot);
|
|
va_start(args, fmt);
|
|
|
|
vaf.fmt = fmt;
|
|
vaf.va = &args;
|
|
|
|
btrfs_crit(fs_info,
|
|
"corrupt %s: root=%llu block=%llu slot=%d bg_start=%llu bg_len=%llu, %pV",
|
|
btrfs_header_level(eb) == 0 ? "leaf" : "node",
|
|
btrfs_header_owner(eb), btrfs_header_bytenr(eb), slot,
|
|
key.objectid, key.offset, &vaf);
|
|
va_end(args);
|
|
}
|
|
|
|
static int check_block_group_item(struct extent_buffer *leaf,
|
|
struct btrfs_key *key, int slot)
|
|
{
|
|
struct btrfs_fs_info *fs_info = leaf->fs_info;
|
|
struct btrfs_block_group_item bgi;
|
|
u32 item_size = btrfs_item_size(leaf, slot);
|
|
u64 chunk_objectid;
|
|
u64 flags;
|
|
u64 type;
|
|
|
|
/*
|
|
* Here we don't really care about alignment since extent allocator can
|
|
* handle it. We care more about the size.
|
|
*/
|
|
if (unlikely(key->offset == 0)) {
|
|
block_group_err(leaf, slot,
|
|
"invalid block group size 0");
|
|
return -EUCLEAN;
|
|
}
|
|
|
|
if (unlikely(item_size != sizeof(bgi))) {
|
|
block_group_err(leaf, slot,
|
|
"invalid item size, have %u expect %zu",
|
|
item_size, sizeof(bgi));
|
|
return -EUCLEAN;
|
|
}
|
|
|
|
read_extent_buffer(leaf, &bgi, btrfs_item_ptr_offset(leaf, slot),
|
|
sizeof(bgi));
|
|
chunk_objectid = btrfs_stack_block_group_chunk_objectid(&bgi);
|
|
if (btrfs_fs_incompat(fs_info, EXTENT_TREE_V2)) {
|
|
/*
|
|
* We don't init the nr_global_roots until we load the global
|
|
* roots, so this could be 0 at mount time. If it's 0 we'll
|
|
* just assume we're fine, and later we'll check against our
|
|
* actual value.
|
|
*/
|
|
if (unlikely(fs_info->nr_global_roots &&
|
|
chunk_objectid >= fs_info->nr_global_roots)) {
|
|
block_group_err(leaf, slot,
|
|
"invalid block group global root id, have %llu, needs to be <= %llu",
|
|
chunk_objectid,
|
|
fs_info->nr_global_roots);
|
|
return -EUCLEAN;
|
|
}
|
|
} else if (unlikely(chunk_objectid != BTRFS_FIRST_CHUNK_TREE_OBJECTID)) {
|
|
block_group_err(leaf, slot,
|
|
"invalid block group chunk objectid, have %llu expect %llu",
|
|
btrfs_stack_block_group_chunk_objectid(&bgi),
|
|
BTRFS_FIRST_CHUNK_TREE_OBJECTID);
|
|
return -EUCLEAN;
|
|
}
|
|
|
|
if (unlikely(btrfs_stack_block_group_used(&bgi) > key->offset)) {
|
|
block_group_err(leaf, slot,
|
|
"invalid block group used, have %llu expect [0, %llu)",
|
|
btrfs_stack_block_group_used(&bgi), key->offset);
|
|
return -EUCLEAN;
|
|
}
|
|
|
|
flags = btrfs_stack_block_group_flags(&bgi);
|
|
if (unlikely(hweight64(flags & BTRFS_BLOCK_GROUP_PROFILE_MASK) > 1)) {
|
|
block_group_err(leaf, slot,
|
|
"invalid profile flags, have 0x%llx (%lu bits set) expect no more than 1 bit set",
|
|
flags & BTRFS_BLOCK_GROUP_PROFILE_MASK,
|
|
hweight64(flags & BTRFS_BLOCK_GROUP_PROFILE_MASK));
|
|
return -EUCLEAN;
|
|
}
|
|
|
|
type = flags & BTRFS_BLOCK_GROUP_TYPE_MASK;
|
|
if (unlikely(type != BTRFS_BLOCK_GROUP_DATA &&
|
|
type != BTRFS_BLOCK_GROUP_METADATA &&
|
|
type != BTRFS_BLOCK_GROUP_SYSTEM &&
|
|
type != (BTRFS_BLOCK_GROUP_METADATA |
|
|
BTRFS_BLOCK_GROUP_DATA))) {
|
|
block_group_err(leaf, slot,
|
|
"invalid type, have 0x%llx (%lu bits set) expect either 0x%llx, 0x%llx, 0x%llx or 0x%llx",
|
|
type, hweight64(type),
|
|
BTRFS_BLOCK_GROUP_DATA, BTRFS_BLOCK_GROUP_METADATA,
|
|
BTRFS_BLOCK_GROUP_SYSTEM,
|
|
BTRFS_BLOCK_GROUP_METADATA | BTRFS_BLOCK_GROUP_DATA);
|
|
return -EUCLEAN;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
__printf(4, 5)
|
|
__cold
|
|
static void chunk_err(const struct extent_buffer *leaf,
|
|
const struct btrfs_chunk *chunk, u64 logical,
|
|
const char *fmt, ...)
|
|
{
|
|
const struct btrfs_fs_info *fs_info = leaf->fs_info;
|
|
bool is_sb;
|
|
struct va_format vaf;
|
|
va_list args;
|
|
int i;
|
|
int slot = -1;
|
|
|
|
/* Only superblock eb is able to have such small offset */
|
|
is_sb = (leaf->start == BTRFS_SUPER_INFO_OFFSET);
|
|
|
|
if (!is_sb) {
|
|
/*
|
|
* Get the slot number by iterating through all slots, this
|
|
* would provide better readability.
|
|
*/
|
|
for (i = 0; i < btrfs_header_nritems(leaf); i++) {
|
|
if (btrfs_item_ptr_offset(leaf, i) ==
|
|
(unsigned long)chunk) {
|
|
slot = i;
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
va_start(args, fmt);
|
|
vaf.fmt = fmt;
|
|
vaf.va = &args;
|
|
|
|
if (is_sb)
|
|
btrfs_crit(fs_info,
|
|
"corrupt superblock syschunk array: chunk_start=%llu, %pV",
|
|
logical, &vaf);
|
|
else
|
|
btrfs_crit(fs_info,
|
|
"corrupt leaf: root=%llu block=%llu slot=%d chunk_start=%llu, %pV",
|
|
BTRFS_CHUNK_TREE_OBJECTID, leaf->start, slot,
|
|
logical, &vaf);
|
|
va_end(args);
|
|
}
|
|
|
|
/*
|
|
* The common chunk check which could also work on super block sys chunk array.
|
|
*
|
|
* Return -EUCLEAN if anything is corrupted.
|
|
* Return 0 if everything is OK.
|
|
*/
|
|
int btrfs_check_chunk_valid(struct extent_buffer *leaf,
|
|
struct btrfs_chunk *chunk, u64 logical)
|
|
{
|
|
struct btrfs_fs_info *fs_info = leaf->fs_info;
|
|
u64 length;
|
|
u64 chunk_end;
|
|
u64 stripe_len;
|
|
u16 num_stripes;
|
|
u16 sub_stripes;
|
|
u64 type;
|
|
u64 features;
|
|
bool mixed = false;
|
|
int raid_index;
|
|
int nparity;
|
|
int ncopies;
|
|
|
|
length = btrfs_chunk_length(leaf, chunk);
|
|
stripe_len = btrfs_chunk_stripe_len(leaf, chunk);
|
|
num_stripes = btrfs_chunk_num_stripes(leaf, chunk);
|
|
sub_stripes = btrfs_chunk_sub_stripes(leaf, chunk);
|
|
type = btrfs_chunk_type(leaf, chunk);
|
|
raid_index = btrfs_bg_flags_to_raid_index(type);
|
|
ncopies = btrfs_raid_array[raid_index].ncopies;
|
|
nparity = btrfs_raid_array[raid_index].nparity;
|
|
|
|
if (unlikely(!num_stripes)) {
|
|
chunk_err(leaf, chunk, logical,
|
|
"invalid chunk num_stripes, have %u", num_stripes);
|
|
return -EUCLEAN;
|
|
}
|
|
if (unlikely(num_stripes < ncopies)) {
|
|
chunk_err(leaf, chunk, logical,
|
|
"invalid chunk num_stripes < ncopies, have %u < %d",
|
|
num_stripes, ncopies);
|
|
return -EUCLEAN;
|
|
}
|
|
if (unlikely(nparity && num_stripes == nparity)) {
|
|
chunk_err(leaf, chunk, logical,
|
|
"invalid chunk num_stripes == nparity, have %u == %d",
|
|
num_stripes, nparity);
|
|
return -EUCLEAN;
|
|
}
|
|
if (unlikely(!IS_ALIGNED(logical, fs_info->sectorsize))) {
|
|
chunk_err(leaf, chunk, logical,
|
|
"invalid chunk logical, have %llu should aligned to %u",
|
|
logical, fs_info->sectorsize);
|
|
return -EUCLEAN;
|
|
}
|
|
if (unlikely(btrfs_chunk_sector_size(leaf, chunk) != fs_info->sectorsize)) {
|
|
chunk_err(leaf, chunk, logical,
|
|
"invalid chunk sectorsize, have %u expect %u",
|
|
btrfs_chunk_sector_size(leaf, chunk),
|
|
fs_info->sectorsize);
|
|
return -EUCLEAN;
|
|
}
|
|
if (unlikely(!length || !IS_ALIGNED(length, fs_info->sectorsize))) {
|
|
chunk_err(leaf, chunk, logical,
|
|
"invalid chunk length, have %llu", length);
|
|
return -EUCLEAN;
|
|
}
|
|
if (unlikely(check_add_overflow(logical, length, &chunk_end))) {
|
|
chunk_err(leaf, chunk, logical,
|
|
"invalid chunk logical start and length, have logical start %llu length %llu",
|
|
logical, length);
|
|
return -EUCLEAN;
|
|
}
|
|
if (unlikely(!is_power_of_2(stripe_len) || stripe_len != BTRFS_STRIPE_LEN)) {
|
|
chunk_err(leaf, chunk, logical,
|
|
"invalid chunk stripe length: %llu",
|
|
stripe_len);
|
|
return -EUCLEAN;
|
|
}
|
|
if (unlikely(type & ~(BTRFS_BLOCK_GROUP_TYPE_MASK |
|
|
BTRFS_BLOCK_GROUP_PROFILE_MASK))) {
|
|
chunk_err(leaf, chunk, logical,
|
|
"unrecognized chunk type: 0x%llx",
|
|
~(BTRFS_BLOCK_GROUP_TYPE_MASK |
|
|
BTRFS_BLOCK_GROUP_PROFILE_MASK) &
|
|
btrfs_chunk_type(leaf, chunk));
|
|
return -EUCLEAN;
|
|
}
|
|
|
|
if (unlikely(!has_single_bit_set(type & BTRFS_BLOCK_GROUP_PROFILE_MASK) &&
|
|
(type & BTRFS_BLOCK_GROUP_PROFILE_MASK) != 0)) {
|
|
chunk_err(leaf, chunk, logical,
|
|
"invalid chunk profile flag: 0x%llx, expect 0 or 1 bit set",
|
|
type & BTRFS_BLOCK_GROUP_PROFILE_MASK);
|
|
return -EUCLEAN;
|
|
}
|
|
if (unlikely((type & BTRFS_BLOCK_GROUP_TYPE_MASK) == 0)) {
|
|
chunk_err(leaf, chunk, logical,
|
|
"missing chunk type flag, have 0x%llx one bit must be set in 0x%llx",
|
|
type, BTRFS_BLOCK_GROUP_TYPE_MASK);
|
|
return -EUCLEAN;
|
|
}
|
|
|
|
if (unlikely((type & BTRFS_BLOCK_GROUP_SYSTEM) &&
|
|
(type & (BTRFS_BLOCK_GROUP_METADATA |
|
|
BTRFS_BLOCK_GROUP_DATA)))) {
|
|
chunk_err(leaf, chunk, logical,
|
|
"system chunk with data or metadata type: 0x%llx",
|
|
type);
|
|
return -EUCLEAN;
|
|
}
|
|
|
|
features = btrfs_super_incompat_flags(fs_info->super_copy);
|
|
if (features & BTRFS_FEATURE_INCOMPAT_MIXED_GROUPS)
|
|
mixed = true;
|
|
|
|
if (!mixed) {
|
|
if (unlikely((type & BTRFS_BLOCK_GROUP_METADATA) &&
|
|
(type & BTRFS_BLOCK_GROUP_DATA))) {
|
|
chunk_err(leaf, chunk, logical,
|
|
"mixed chunk type in non-mixed mode: 0x%llx", type);
|
|
return -EUCLEAN;
|
|
}
|
|
}
|
|
|
|
if (unlikely((type & BTRFS_BLOCK_GROUP_RAID10 &&
|
|
sub_stripes != btrfs_raid_array[BTRFS_RAID_RAID10].sub_stripes) ||
|
|
(type & BTRFS_BLOCK_GROUP_RAID1 &&
|
|
num_stripes != btrfs_raid_array[BTRFS_RAID_RAID1].devs_min) ||
|
|
(type & BTRFS_BLOCK_GROUP_RAID1C3 &&
|
|
num_stripes != btrfs_raid_array[BTRFS_RAID_RAID1C3].devs_min) ||
|
|
(type & BTRFS_BLOCK_GROUP_RAID1C4 &&
|
|
num_stripes != btrfs_raid_array[BTRFS_RAID_RAID1C4].devs_min) ||
|
|
(type & BTRFS_BLOCK_GROUP_RAID5 &&
|
|
num_stripes < btrfs_raid_array[BTRFS_RAID_RAID5].devs_min) ||
|
|
(type & BTRFS_BLOCK_GROUP_RAID6 &&
|
|
num_stripes < btrfs_raid_array[BTRFS_RAID_RAID6].devs_min) ||
|
|
(type & BTRFS_BLOCK_GROUP_DUP &&
|
|
num_stripes != btrfs_raid_array[BTRFS_RAID_DUP].dev_stripes) ||
|
|
((type & BTRFS_BLOCK_GROUP_PROFILE_MASK) == 0 &&
|
|
num_stripes != btrfs_raid_array[BTRFS_RAID_SINGLE].dev_stripes))) {
|
|
chunk_err(leaf, chunk, logical,
|
|
"invalid num_stripes:sub_stripes %u:%u for profile %llu",
|
|
num_stripes, sub_stripes,
|
|
type & BTRFS_BLOCK_GROUP_PROFILE_MASK);
|
|
return -EUCLEAN;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* Enhanced version of chunk item checker.
|
|
*
|
|
* The common btrfs_check_chunk_valid() doesn't check item size since it needs
|
|
* to work on super block sys_chunk_array which doesn't have full item ptr.
|
|
*/
|
|
static int check_leaf_chunk_item(struct extent_buffer *leaf,
|
|
struct btrfs_chunk *chunk,
|
|
struct btrfs_key *key, int slot)
|
|
{
|
|
int num_stripes;
|
|
|
|
if (unlikely(btrfs_item_size(leaf, slot) < sizeof(struct btrfs_chunk))) {
|
|
chunk_err(leaf, chunk, key->offset,
|
|
"invalid chunk item size: have %u expect [%zu, %u)",
|
|
btrfs_item_size(leaf, slot),
|
|
sizeof(struct btrfs_chunk),
|
|
BTRFS_LEAF_DATA_SIZE(leaf->fs_info));
|
|
return -EUCLEAN;
|
|
}
|
|
|
|
num_stripes = btrfs_chunk_num_stripes(leaf, chunk);
|
|
/* Let btrfs_check_chunk_valid() handle this error type */
|
|
if (num_stripes == 0)
|
|
goto out;
|
|
|
|
if (unlikely(btrfs_chunk_item_size(num_stripes) !=
|
|
btrfs_item_size(leaf, slot))) {
|
|
chunk_err(leaf, chunk, key->offset,
|
|
"invalid chunk item size: have %u expect %lu",
|
|
btrfs_item_size(leaf, slot),
|
|
btrfs_chunk_item_size(num_stripes));
|
|
return -EUCLEAN;
|
|
}
|
|
out:
|
|
return btrfs_check_chunk_valid(leaf, chunk, key->offset);
|
|
}
|
|
|
|
__printf(3, 4)
|
|
__cold
|
|
static void dev_item_err(const struct extent_buffer *eb, int slot,
|
|
const char *fmt, ...)
|
|
{
|
|
struct btrfs_key key;
|
|
struct va_format vaf;
|
|
va_list args;
|
|
|
|
btrfs_item_key_to_cpu(eb, &key, slot);
|
|
va_start(args, fmt);
|
|
|
|
vaf.fmt = fmt;
|
|
vaf.va = &args;
|
|
|
|
btrfs_crit(eb->fs_info,
|
|
"corrupt %s: root=%llu block=%llu slot=%d devid=%llu %pV",
|
|
btrfs_header_level(eb) == 0 ? "leaf" : "node",
|
|
btrfs_header_owner(eb), btrfs_header_bytenr(eb), slot,
|
|
key.objectid, &vaf);
|
|
va_end(args);
|
|
}
|
|
|
|
static int check_dev_item(struct extent_buffer *leaf,
|
|
struct btrfs_key *key, int slot)
|
|
{
|
|
struct btrfs_dev_item *ditem;
|
|
const u32 item_size = btrfs_item_size(leaf, slot);
|
|
|
|
if (unlikely(key->objectid != BTRFS_DEV_ITEMS_OBJECTID)) {
|
|
dev_item_err(leaf, slot,
|
|
"invalid objectid: has=%llu expect=%llu",
|
|
key->objectid, BTRFS_DEV_ITEMS_OBJECTID);
|
|
return -EUCLEAN;
|
|
}
|
|
|
|
if (unlikely(item_size != sizeof(*ditem))) {
|
|
dev_item_err(leaf, slot, "invalid item size: has %u expect %zu",
|
|
item_size, sizeof(*ditem));
|
|
return -EUCLEAN;
|
|
}
|
|
|
|
ditem = btrfs_item_ptr(leaf, slot, struct btrfs_dev_item);
|
|
if (unlikely(btrfs_device_id(leaf, ditem) != key->offset)) {
|
|
dev_item_err(leaf, slot,
|
|
"devid mismatch: key has=%llu item has=%llu",
|
|
key->offset, btrfs_device_id(leaf, ditem));
|
|
return -EUCLEAN;
|
|
}
|
|
|
|
/*
|
|
* For device total_bytes, we don't have reliable way to check it, as
|
|
* it can be 0 for device removal. Device size check can only be done
|
|
* by dev extents check.
|
|
*/
|
|
if (unlikely(btrfs_device_bytes_used(leaf, ditem) >
|
|
btrfs_device_total_bytes(leaf, ditem))) {
|
|
dev_item_err(leaf, slot,
|
|
"invalid bytes used: have %llu expect [0, %llu]",
|
|
btrfs_device_bytes_used(leaf, ditem),
|
|
btrfs_device_total_bytes(leaf, ditem));
|
|
return -EUCLEAN;
|
|
}
|
|
/*
|
|
* Remaining members like io_align/type/gen/dev_group aren't really
|
|
* utilized. Skip them to make later usage of them easier.
|
|
*/
|
|
return 0;
|
|
}
|
|
|
|
static int check_inode_item(struct extent_buffer *leaf,
|
|
struct btrfs_key *key, int slot)
|
|
{
|
|
struct btrfs_fs_info *fs_info = leaf->fs_info;
|
|
struct btrfs_inode_item *iitem;
|
|
u64 super_gen = btrfs_super_generation(fs_info->super_copy);
|
|
u32 valid_mask = (S_IFMT | S_ISUID | S_ISGID | S_ISVTX | 0777);
|
|
const u32 item_size = btrfs_item_size(leaf, slot);
|
|
u32 mode;
|
|
int ret;
|
|
u32 flags;
|
|
u32 ro_flags;
|
|
|
|
ret = check_inode_key(leaf, key, slot);
|
|
if (unlikely(ret < 0))
|
|
return ret;
|
|
|
|
if (unlikely(item_size != sizeof(*iitem))) {
|
|
generic_err(leaf, slot, "invalid item size: has %u expect %zu",
|
|
item_size, sizeof(*iitem));
|
|
return -EUCLEAN;
|
|
}
|
|
|
|
iitem = btrfs_item_ptr(leaf, slot, struct btrfs_inode_item);
|
|
|
|
/* Here we use super block generation + 1 to handle log tree */
|
|
if (unlikely(btrfs_inode_generation(leaf, iitem) > super_gen + 1)) {
|
|
inode_item_err(leaf, slot,
|
|
"invalid inode generation: has %llu expect (0, %llu]",
|
|
btrfs_inode_generation(leaf, iitem),
|
|
super_gen + 1);
|
|
return -EUCLEAN;
|
|
}
|
|
/* Note for ROOT_TREE_DIR_ITEM, mkfs could set its transid 0 */
|
|
if (unlikely(btrfs_inode_transid(leaf, iitem) > super_gen + 1)) {
|
|
inode_item_err(leaf, slot,
|
|
"invalid inode transid: has %llu expect [0, %llu]",
|
|
btrfs_inode_transid(leaf, iitem), super_gen + 1);
|
|
return -EUCLEAN;
|
|
}
|
|
|
|
/*
|
|
* For size and nbytes it's better not to be too strict, as for dir
|
|
* item its size/nbytes can easily get wrong, but doesn't affect
|
|
* anything in the fs. So here we skip the check.
|
|
*/
|
|
mode = btrfs_inode_mode(leaf, iitem);
|
|
if (unlikely(mode & ~valid_mask)) {
|
|
inode_item_err(leaf, slot,
|
|
"unknown mode bit detected: 0x%x",
|
|
mode & ~valid_mask);
|
|
return -EUCLEAN;
|
|
}
|
|
|
|
/*
|
|
* S_IFMT is not bit mapped so we can't completely rely on
|
|
* is_power_of_2/has_single_bit_set, but it can save us from checking
|
|
* FIFO/CHR/DIR/REG. Only needs to check BLK, LNK and SOCKS
|
|
*/
|
|
if (!has_single_bit_set(mode & S_IFMT)) {
|
|
if (unlikely(!S_ISLNK(mode) && !S_ISBLK(mode) && !S_ISSOCK(mode))) {
|
|
inode_item_err(leaf, slot,
|
|
"invalid mode: has 0%o expect valid S_IF* bit(s)",
|
|
mode & S_IFMT);
|
|
return -EUCLEAN;
|
|
}
|
|
}
|
|
if (unlikely(S_ISDIR(mode) && btrfs_inode_nlink(leaf, iitem) > 1)) {
|
|
inode_item_err(leaf, slot,
|
|
"invalid nlink: has %u expect no more than 1 for dir",
|
|
btrfs_inode_nlink(leaf, iitem));
|
|
return -EUCLEAN;
|
|
}
|
|
btrfs_inode_split_flags(btrfs_inode_flags(leaf, iitem), &flags, &ro_flags);
|
|
if (unlikely(flags & ~BTRFS_INODE_FLAG_MASK)) {
|
|
inode_item_err(leaf, slot,
|
|
"unknown incompat flags detected: 0x%x", flags);
|
|
return -EUCLEAN;
|
|
}
|
|
if (unlikely(!sb_rdonly(fs_info->sb) &&
|
|
(ro_flags & ~BTRFS_INODE_RO_FLAG_MASK))) {
|
|
inode_item_err(leaf, slot,
|
|
"unknown ro-compat flags detected on writeable mount: 0x%x",
|
|
ro_flags);
|
|
return -EUCLEAN;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
static int check_root_item(struct extent_buffer *leaf, struct btrfs_key *key,
|
|
int slot)
|
|
{
|
|
struct btrfs_fs_info *fs_info = leaf->fs_info;
|
|
struct btrfs_root_item ri = { 0 };
|
|
const u64 valid_root_flags = BTRFS_ROOT_SUBVOL_RDONLY |
|
|
BTRFS_ROOT_SUBVOL_DEAD;
|
|
int ret;
|
|
|
|
ret = check_root_key(leaf, key, slot);
|
|
if (unlikely(ret < 0))
|
|
return ret;
|
|
|
|
if (unlikely(btrfs_item_size(leaf, slot) != sizeof(ri) &&
|
|
btrfs_item_size(leaf, slot) !=
|
|
btrfs_legacy_root_item_size())) {
|
|
generic_err(leaf, slot,
|
|
"invalid root item size, have %u expect %zu or %u",
|
|
btrfs_item_size(leaf, slot), sizeof(ri),
|
|
btrfs_legacy_root_item_size());
|
|
return -EUCLEAN;
|
|
}
|
|
|
|
/*
|
|
* For legacy root item, the members starting at generation_v2 will be
|
|
* all filled with 0.
|
|
* And since we allow geneartion_v2 as 0, it will still pass the check.
|
|
*/
|
|
read_extent_buffer(leaf, &ri, btrfs_item_ptr_offset(leaf, slot),
|
|
btrfs_item_size(leaf, slot));
|
|
|
|
/* Generation related */
|
|
if (unlikely(btrfs_root_generation(&ri) >
|
|
btrfs_super_generation(fs_info->super_copy) + 1)) {
|
|
generic_err(leaf, slot,
|
|
"invalid root generation, have %llu expect (0, %llu]",
|
|
btrfs_root_generation(&ri),
|
|
btrfs_super_generation(fs_info->super_copy) + 1);
|
|
return -EUCLEAN;
|
|
}
|
|
if (unlikely(btrfs_root_generation_v2(&ri) >
|
|
btrfs_super_generation(fs_info->super_copy) + 1)) {
|
|
generic_err(leaf, slot,
|
|
"invalid root v2 generation, have %llu expect (0, %llu]",
|
|
btrfs_root_generation_v2(&ri),
|
|
btrfs_super_generation(fs_info->super_copy) + 1);
|
|
return -EUCLEAN;
|
|
}
|
|
if (unlikely(btrfs_root_last_snapshot(&ri) >
|
|
btrfs_super_generation(fs_info->super_copy) + 1)) {
|
|
generic_err(leaf, slot,
|
|
"invalid root last_snapshot, have %llu expect (0, %llu]",
|
|
btrfs_root_last_snapshot(&ri),
|
|
btrfs_super_generation(fs_info->super_copy) + 1);
|
|
return -EUCLEAN;
|
|
}
|
|
|
|
/* Alignment and level check */
|
|
if (unlikely(!IS_ALIGNED(btrfs_root_bytenr(&ri), fs_info->sectorsize))) {
|
|
generic_err(leaf, slot,
|
|
"invalid root bytenr, have %llu expect to be aligned to %u",
|
|
btrfs_root_bytenr(&ri), fs_info->sectorsize);
|
|
return -EUCLEAN;
|
|
}
|
|
if (unlikely(btrfs_root_level(&ri) >= BTRFS_MAX_LEVEL)) {
|
|
generic_err(leaf, slot,
|
|
"invalid root level, have %u expect [0, %u]",
|
|
btrfs_root_level(&ri), BTRFS_MAX_LEVEL - 1);
|
|
return -EUCLEAN;
|
|
}
|
|
if (unlikely(btrfs_root_drop_level(&ri) >= BTRFS_MAX_LEVEL)) {
|
|
generic_err(leaf, slot,
|
|
"invalid root level, have %u expect [0, %u]",
|
|
btrfs_root_drop_level(&ri), BTRFS_MAX_LEVEL - 1);
|
|
return -EUCLEAN;
|
|
}
|
|
|
|
/* Flags check */
|
|
if (unlikely(btrfs_root_flags(&ri) & ~valid_root_flags)) {
|
|
generic_err(leaf, slot,
|
|
"invalid root flags, have 0x%llx expect mask 0x%llx",
|
|
btrfs_root_flags(&ri), valid_root_flags);
|
|
return -EUCLEAN;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
__printf(3,4)
|
|
__cold
|
|
static void extent_err(const struct extent_buffer *eb, int slot,
|
|
const char *fmt, ...)
|
|
{
|
|
struct btrfs_key key;
|
|
struct va_format vaf;
|
|
va_list args;
|
|
u64 bytenr;
|
|
u64 len;
|
|
|
|
btrfs_item_key_to_cpu(eb, &key, slot);
|
|
bytenr = key.objectid;
|
|
if (key.type == BTRFS_METADATA_ITEM_KEY ||
|
|
key.type == BTRFS_TREE_BLOCK_REF_KEY ||
|
|
key.type == BTRFS_SHARED_BLOCK_REF_KEY)
|
|
len = eb->fs_info->nodesize;
|
|
else
|
|
len = key.offset;
|
|
va_start(args, fmt);
|
|
|
|
vaf.fmt = fmt;
|
|
vaf.va = &args;
|
|
|
|
btrfs_crit(eb->fs_info,
|
|
"corrupt %s: block=%llu slot=%d extent bytenr=%llu len=%llu %pV",
|
|
btrfs_header_level(eb) == 0 ? "leaf" : "node",
|
|
eb->start, slot, bytenr, len, &vaf);
|
|
va_end(args);
|
|
}
|
|
|
|
static int check_extent_item(struct extent_buffer *leaf,
|
|
struct btrfs_key *key, int slot,
|
|
struct btrfs_key *prev_key)
|
|
{
|
|
struct btrfs_fs_info *fs_info = leaf->fs_info;
|
|
struct btrfs_extent_item *ei;
|
|
bool is_tree_block = false;
|
|
unsigned long ptr; /* Current pointer inside inline refs */
|
|
unsigned long end; /* Extent item end */
|
|
const u32 item_size = btrfs_item_size(leaf, slot);
|
|
u64 flags;
|
|
u64 generation;
|
|
u64 total_refs; /* Total refs in btrfs_extent_item */
|
|
u64 inline_refs = 0; /* found total inline refs */
|
|
|
|
if (unlikely(key->type == BTRFS_METADATA_ITEM_KEY &&
|
|
!btrfs_fs_incompat(fs_info, SKINNY_METADATA))) {
|
|
generic_err(leaf, slot,
|
|
"invalid key type, METADATA_ITEM type invalid when SKINNY_METADATA feature disabled");
|
|
return -EUCLEAN;
|
|
}
|
|
/* key->objectid is the bytenr for both key types */
|
|
if (unlikely(!IS_ALIGNED(key->objectid, fs_info->sectorsize))) {
|
|
generic_err(leaf, slot,
|
|
"invalid key objectid, have %llu expect to be aligned to %u",
|
|
key->objectid, fs_info->sectorsize);
|
|
return -EUCLEAN;
|
|
}
|
|
|
|
/* key->offset is tree level for METADATA_ITEM_KEY */
|
|
if (unlikely(key->type == BTRFS_METADATA_ITEM_KEY &&
|
|
key->offset >= BTRFS_MAX_LEVEL)) {
|
|
extent_err(leaf, slot,
|
|
"invalid tree level, have %llu expect [0, %u]",
|
|
key->offset, BTRFS_MAX_LEVEL - 1);
|
|
return -EUCLEAN;
|
|
}
|
|
|
|
/*
|
|
* EXTENT/METADATA_ITEM consists of:
|
|
* 1) One btrfs_extent_item
|
|
* Records the total refs, type and generation of the extent.
|
|
*
|
|
* 2) One btrfs_tree_block_info (for EXTENT_ITEM and tree backref only)
|
|
* Records the first key and level of the tree block.
|
|
*
|
|
* 2) Zero or more btrfs_extent_inline_ref(s)
|
|
* Each inline ref has one btrfs_extent_inline_ref shows:
|
|
* 2.1) The ref type, one of the 4
|
|
* TREE_BLOCK_REF Tree block only
|
|
* SHARED_BLOCK_REF Tree block only
|
|
* EXTENT_DATA_REF Data only
|
|
* SHARED_DATA_REF Data only
|
|
* 2.2) Ref type specific data
|
|
* Either using btrfs_extent_inline_ref::offset, or specific
|
|
* data structure.
|
|
*/
|
|
if (unlikely(item_size < sizeof(*ei))) {
|
|
extent_err(leaf, slot,
|
|
"invalid item size, have %u expect [%zu, %u)",
|
|
item_size, sizeof(*ei),
|
|
BTRFS_LEAF_DATA_SIZE(fs_info));
|
|
return -EUCLEAN;
|
|
}
|
|
end = item_size + btrfs_item_ptr_offset(leaf, slot);
|
|
|
|
/* Checks against extent_item */
|
|
ei = btrfs_item_ptr(leaf, slot, struct btrfs_extent_item);
|
|
flags = btrfs_extent_flags(leaf, ei);
|
|
total_refs = btrfs_extent_refs(leaf, ei);
|
|
generation = btrfs_extent_generation(leaf, ei);
|
|
if (unlikely(generation >
|
|
btrfs_super_generation(fs_info->super_copy) + 1)) {
|
|
extent_err(leaf, slot,
|
|
"invalid generation, have %llu expect (0, %llu]",
|
|
generation,
|
|
btrfs_super_generation(fs_info->super_copy) + 1);
|
|
return -EUCLEAN;
|
|
}
|
|
if (unlikely(!has_single_bit_set(flags & (BTRFS_EXTENT_FLAG_DATA |
|
|
BTRFS_EXTENT_FLAG_TREE_BLOCK)))) {
|
|
extent_err(leaf, slot,
|
|
"invalid extent flag, have 0x%llx expect 1 bit set in 0x%llx",
|
|
flags, BTRFS_EXTENT_FLAG_DATA |
|
|
BTRFS_EXTENT_FLAG_TREE_BLOCK);
|
|
return -EUCLEAN;
|
|
}
|
|
is_tree_block = !!(flags & BTRFS_EXTENT_FLAG_TREE_BLOCK);
|
|
if (is_tree_block) {
|
|
if (unlikely(key->type == BTRFS_EXTENT_ITEM_KEY &&
|
|
key->offset != fs_info->nodesize)) {
|
|
extent_err(leaf, slot,
|
|
"invalid extent length, have %llu expect %u",
|
|
key->offset, fs_info->nodesize);
|
|
return -EUCLEAN;
|
|
}
|
|
} else {
|
|
if (unlikely(key->type != BTRFS_EXTENT_ITEM_KEY)) {
|
|
extent_err(leaf, slot,
|
|
"invalid key type, have %u expect %u for data backref",
|
|
key->type, BTRFS_EXTENT_ITEM_KEY);
|
|
return -EUCLEAN;
|
|
}
|
|
if (unlikely(!IS_ALIGNED(key->offset, fs_info->sectorsize))) {
|
|
extent_err(leaf, slot,
|
|
"invalid extent length, have %llu expect aligned to %u",
|
|
key->offset, fs_info->sectorsize);
|
|
return -EUCLEAN;
|
|
}
|
|
if (unlikely(flags & BTRFS_BLOCK_FLAG_FULL_BACKREF)) {
|
|
extent_err(leaf, slot,
|
|
"invalid extent flag, data has full backref set");
|
|
return -EUCLEAN;
|
|
}
|
|
}
|
|
ptr = (unsigned long)(struct btrfs_extent_item *)(ei + 1);
|
|
|
|
/* Check the special case of btrfs_tree_block_info */
|
|
if (is_tree_block && key->type != BTRFS_METADATA_ITEM_KEY) {
|
|
struct btrfs_tree_block_info *info;
|
|
|
|
info = (struct btrfs_tree_block_info *)ptr;
|
|
if (unlikely(btrfs_tree_block_level(leaf, info) >= BTRFS_MAX_LEVEL)) {
|
|
extent_err(leaf, slot,
|
|
"invalid tree block info level, have %u expect [0, %u]",
|
|
btrfs_tree_block_level(leaf, info),
|
|
BTRFS_MAX_LEVEL - 1);
|
|
return -EUCLEAN;
|
|
}
|
|
ptr = (unsigned long)(struct btrfs_tree_block_info *)(info + 1);
|
|
}
|
|
|
|
/* Check inline refs */
|
|
while (ptr < end) {
|
|
struct btrfs_extent_inline_ref *iref;
|
|
struct btrfs_extent_data_ref *dref;
|
|
struct btrfs_shared_data_ref *sref;
|
|
u64 dref_offset;
|
|
u64 inline_offset;
|
|
u8 inline_type;
|
|
|
|
if (unlikely(ptr + sizeof(*iref) > end)) {
|
|
extent_err(leaf, slot,
|
|
"inline ref item overflows extent item, ptr %lu iref size %zu end %lu",
|
|
ptr, sizeof(*iref), end);
|
|
return -EUCLEAN;
|
|
}
|
|
iref = (struct btrfs_extent_inline_ref *)ptr;
|
|
inline_type = btrfs_extent_inline_ref_type(leaf, iref);
|
|
inline_offset = btrfs_extent_inline_ref_offset(leaf, iref);
|
|
if (unlikely(ptr + btrfs_extent_inline_ref_size(inline_type) > end)) {
|
|
extent_err(leaf, slot,
|
|
"inline ref item overflows extent item, ptr %lu iref size %u end %lu",
|
|
ptr, inline_type, end);
|
|
return -EUCLEAN;
|
|
}
|
|
|
|
switch (inline_type) {
|
|
/* inline_offset is subvolid of the owner, no need to check */
|
|
case BTRFS_TREE_BLOCK_REF_KEY:
|
|
inline_refs++;
|
|
break;
|
|
/* Contains parent bytenr */
|
|
case BTRFS_SHARED_BLOCK_REF_KEY:
|
|
if (unlikely(!IS_ALIGNED(inline_offset,
|
|
fs_info->sectorsize))) {
|
|
extent_err(leaf, slot,
|
|
"invalid tree parent bytenr, have %llu expect aligned to %u",
|
|
inline_offset, fs_info->sectorsize);
|
|
return -EUCLEAN;
|
|
}
|
|
inline_refs++;
|
|
break;
|
|
/*
|
|
* Contains owner subvolid, owner key objectid, adjusted offset.
|
|
* The only obvious corruption can happen in that offset.
|
|
*/
|
|
case BTRFS_EXTENT_DATA_REF_KEY:
|
|
dref = (struct btrfs_extent_data_ref *)(&iref->offset);
|
|
dref_offset = btrfs_extent_data_ref_offset(leaf, dref);
|
|
if (unlikely(!IS_ALIGNED(dref_offset,
|
|
fs_info->sectorsize))) {
|
|
extent_err(leaf, slot,
|
|
"invalid data ref offset, have %llu expect aligned to %u",
|
|
dref_offset, fs_info->sectorsize);
|
|
return -EUCLEAN;
|
|
}
|
|
inline_refs += btrfs_extent_data_ref_count(leaf, dref);
|
|
break;
|
|
/* Contains parent bytenr and ref count */
|
|
case BTRFS_SHARED_DATA_REF_KEY:
|
|
sref = (struct btrfs_shared_data_ref *)(iref + 1);
|
|
if (unlikely(!IS_ALIGNED(inline_offset,
|
|
fs_info->sectorsize))) {
|
|
extent_err(leaf, slot,
|
|
"invalid data parent bytenr, have %llu expect aligned to %u",
|
|
inline_offset, fs_info->sectorsize);
|
|
return -EUCLEAN;
|
|
}
|
|
inline_refs += btrfs_shared_data_ref_count(leaf, sref);
|
|
break;
|
|
default:
|
|
extent_err(leaf, slot, "unknown inline ref type: %u",
|
|
inline_type);
|
|
return -EUCLEAN;
|
|
}
|
|
ptr += btrfs_extent_inline_ref_size(inline_type);
|
|
}
|
|
/* No padding is allowed */
|
|
if (unlikely(ptr != end)) {
|
|
extent_err(leaf, slot,
|
|
"invalid extent item size, padding bytes found");
|
|
return -EUCLEAN;
|
|
}
|
|
|
|
/* Finally, check the inline refs against total refs */
|
|
if (unlikely(inline_refs > total_refs)) {
|
|
extent_err(leaf, slot,
|
|
"invalid extent refs, have %llu expect >= inline %llu",
|
|
total_refs, inline_refs);
|
|
return -EUCLEAN;
|
|
}
|
|
|
|
if ((prev_key->type == BTRFS_EXTENT_ITEM_KEY) ||
|
|
(prev_key->type == BTRFS_METADATA_ITEM_KEY)) {
|
|
u64 prev_end = prev_key->objectid;
|
|
|
|
if (prev_key->type == BTRFS_METADATA_ITEM_KEY)
|
|
prev_end += fs_info->nodesize;
|
|
else
|
|
prev_end += prev_key->offset;
|
|
|
|
if (unlikely(prev_end > key->objectid)) {
|
|
extent_err(leaf, slot,
|
|
"previous extent [%llu %u %llu] overlaps current extent [%llu %u %llu]",
|
|
prev_key->objectid, prev_key->type,
|
|
prev_key->offset, key->objectid, key->type,
|
|
key->offset);
|
|
return -EUCLEAN;
|
|
}
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int check_simple_keyed_refs(struct extent_buffer *leaf,
|
|
struct btrfs_key *key, int slot)
|
|
{
|
|
u32 expect_item_size = 0;
|
|
|
|
if (key->type == BTRFS_SHARED_DATA_REF_KEY)
|
|
expect_item_size = sizeof(struct btrfs_shared_data_ref);
|
|
|
|
if (unlikely(btrfs_item_size(leaf, slot) != expect_item_size)) {
|
|
generic_err(leaf, slot,
|
|
"invalid item size, have %u expect %u for key type %u",
|
|
btrfs_item_size(leaf, slot),
|
|
expect_item_size, key->type);
|
|
return -EUCLEAN;
|
|
}
|
|
if (unlikely(!IS_ALIGNED(key->objectid, leaf->fs_info->sectorsize))) {
|
|
generic_err(leaf, slot,
|
|
"invalid key objectid for shared block ref, have %llu expect aligned to %u",
|
|
key->objectid, leaf->fs_info->sectorsize);
|
|
return -EUCLEAN;
|
|
}
|
|
if (unlikely(key->type != BTRFS_TREE_BLOCK_REF_KEY &&
|
|
!IS_ALIGNED(key->offset, leaf->fs_info->sectorsize))) {
|
|
extent_err(leaf, slot,
|
|
"invalid tree parent bytenr, have %llu expect aligned to %u",
|
|
key->offset, leaf->fs_info->sectorsize);
|
|
return -EUCLEAN;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
static int check_extent_data_ref(struct extent_buffer *leaf,
|
|
struct btrfs_key *key, int slot)
|
|
{
|
|
struct btrfs_extent_data_ref *dref;
|
|
unsigned long ptr = btrfs_item_ptr_offset(leaf, slot);
|
|
const unsigned long end = ptr + btrfs_item_size(leaf, slot);
|
|
|
|
if (unlikely(btrfs_item_size(leaf, slot) % sizeof(*dref) != 0)) {
|
|
generic_err(leaf, slot,
|
|
"invalid item size, have %u expect aligned to %zu for key type %u",
|
|
btrfs_item_size(leaf, slot),
|
|
sizeof(*dref), key->type);
|
|
return -EUCLEAN;
|
|
}
|
|
if (unlikely(!IS_ALIGNED(key->objectid, leaf->fs_info->sectorsize))) {
|
|
generic_err(leaf, slot,
|
|
"invalid key objectid for shared block ref, have %llu expect aligned to %u",
|
|
key->objectid, leaf->fs_info->sectorsize);
|
|
return -EUCLEAN;
|
|
}
|
|
for (; ptr < end; ptr += sizeof(*dref)) {
|
|
u64 offset;
|
|
|
|
/*
|
|
* We cannot check the extent_data_ref hash due to possible
|
|
* overflow from the leaf due to hash collisions.
|
|
*/
|
|
dref = (struct btrfs_extent_data_ref *)ptr;
|
|
offset = btrfs_extent_data_ref_offset(leaf, dref);
|
|
if (unlikely(!IS_ALIGNED(offset, leaf->fs_info->sectorsize))) {
|
|
extent_err(leaf, slot,
|
|
"invalid extent data backref offset, have %llu expect aligned to %u",
|
|
offset, leaf->fs_info->sectorsize);
|
|
return -EUCLEAN;
|
|
}
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
#define inode_ref_err(eb, slot, fmt, args...) \
|
|
inode_item_err(eb, slot, fmt, ##args)
|
|
static int check_inode_ref(struct extent_buffer *leaf,
|
|
struct btrfs_key *key, struct btrfs_key *prev_key,
|
|
int slot)
|
|
{
|
|
struct btrfs_inode_ref *iref;
|
|
unsigned long ptr;
|
|
unsigned long end;
|
|
|
|
if (unlikely(!check_prev_ino(leaf, key, slot, prev_key)))
|
|
return -EUCLEAN;
|
|
/* namelen can't be 0, so item_size == sizeof() is also invalid */
|
|
if (unlikely(btrfs_item_size(leaf, slot) <= sizeof(*iref))) {
|
|
inode_ref_err(leaf, slot,
|
|
"invalid item size, have %u expect (%zu, %u)",
|
|
btrfs_item_size(leaf, slot),
|
|
sizeof(*iref), BTRFS_LEAF_DATA_SIZE(leaf->fs_info));
|
|
return -EUCLEAN;
|
|
}
|
|
|
|
ptr = btrfs_item_ptr_offset(leaf, slot);
|
|
end = ptr + btrfs_item_size(leaf, slot);
|
|
while (ptr < end) {
|
|
u16 namelen;
|
|
|
|
if (unlikely(ptr + sizeof(iref) > end)) {
|
|
inode_ref_err(leaf, slot,
|
|
"inode ref overflow, ptr %lu end %lu inode_ref_size %zu",
|
|
ptr, end, sizeof(iref));
|
|
return -EUCLEAN;
|
|
}
|
|
|
|
iref = (struct btrfs_inode_ref *)ptr;
|
|
namelen = btrfs_inode_ref_name_len(leaf, iref);
|
|
if (unlikely(ptr + sizeof(*iref) + namelen > end)) {
|
|
inode_ref_err(leaf, slot,
|
|
"inode ref overflow, ptr %lu end %lu namelen %u",
|
|
ptr, end, namelen);
|
|
return -EUCLEAN;
|
|
}
|
|
|
|
/*
|
|
* NOTE: In theory we should record all found index numbers
|
|
* to find any duplicated indexes, but that will be too time
|
|
* consuming for inodes with too many hard links.
|
|
*/
|
|
ptr += sizeof(*iref) + namelen;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* Common point to switch the item-specific validation.
|
|
*/
|
|
static int check_leaf_item(struct extent_buffer *leaf,
|
|
struct btrfs_key *key, int slot,
|
|
struct btrfs_key *prev_key)
|
|
{
|
|
int ret = 0;
|
|
struct btrfs_chunk *chunk;
|
|
|
|
switch (key->type) {
|
|
case BTRFS_EXTENT_DATA_KEY:
|
|
ret = check_extent_data_item(leaf, key, slot, prev_key);
|
|
break;
|
|
case BTRFS_EXTENT_CSUM_KEY:
|
|
ret = check_csum_item(leaf, key, slot, prev_key);
|
|
break;
|
|
case BTRFS_DIR_ITEM_KEY:
|
|
case BTRFS_DIR_INDEX_KEY:
|
|
case BTRFS_XATTR_ITEM_KEY:
|
|
ret = check_dir_item(leaf, key, prev_key, slot);
|
|
break;
|
|
case BTRFS_INODE_REF_KEY:
|
|
ret = check_inode_ref(leaf, key, prev_key, slot);
|
|
break;
|
|
case BTRFS_BLOCK_GROUP_ITEM_KEY:
|
|
ret = check_block_group_item(leaf, key, slot);
|
|
break;
|
|
case BTRFS_CHUNK_ITEM_KEY:
|
|
chunk = btrfs_item_ptr(leaf, slot, struct btrfs_chunk);
|
|
ret = check_leaf_chunk_item(leaf, chunk, key, slot);
|
|
break;
|
|
case BTRFS_DEV_ITEM_KEY:
|
|
ret = check_dev_item(leaf, key, slot);
|
|
break;
|
|
case BTRFS_INODE_ITEM_KEY:
|
|
ret = check_inode_item(leaf, key, slot);
|
|
break;
|
|
case BTRFS_ROOT_ITEM_KEY:
|
|
ret = check_root_item(leaf, key, slot);
|
|
break;
|
|
case BTRFS_EXTENT_ITEM_KEY:
|
|
case BTRFS_METADATA_ITEM_KEY:
|
|
ret = check_extent_item(leaf, key, slot, prev_key);
|
|
break;
|
|
case BTRFS_TREE_BLOCK_REF_KEY:
|
|
case BTRFS_SHARED_DATA_REF_KEY:
|
|
case BTRFS_SHARED_BLOCK_REF_KEY:
|
|
ret = check_simple_keyed_refs(leaf, key, slot);
|
|
break;
|
|
case BTRFS_EXTENT_DATA_REF_KEY:
|
|
ret = check_extent_data_ref(leaf, key, slot);
|
|
break;
|
|
}
|
|
return ret;
|
|
}
|
|
|
|
static int check_leaf(struct extent_buffer *leaf, bool check_item_data)
|
|
{
|
|
struct btrfs_fs_info *fs_info = leaf->fs_info;
|
|
/* No valid key type is 0, so all key should be larger than this key */
|
|
struct btrfs_key prev_key = {0, 0, 0};
|
|
struct btrfs_key key;
|
|
u32 nritems = btrfs_header_nritems(leaf);
|
|
int slot;
|
|
|
|
if (unlikely(btrfs_header_level(leaf) != 0)) {
|
|
generic_err(leaf, 0,
|
|
"invalid level for leaf, have %d expect 0",
|
|
btrfs_header_level(leaf));
|
|
return -EUCLEAN;
|
|
}
|
|
|
|
/*
|
|
* Extent buffers from a relocation tree have a owner field that
|
|
* corresponds to the subvolume tree they are based on. So just from an
|
|
* extent buffer alone we can not find out what is the id of the
|
|
* corresponding subvolume tree, so we can not figure out if the extent
|
|
* buffer corresponds to the root of the relocation tree or not. So
|
|
* skip this check for relocation trees.
|
|
*/
|
|
if (nritems == 0 && !btrfs_header_flag(leaf, BTRFS_HEADER_FLAG_RELOC)) {
|
|
u64 owner = btrfs_header_owner(leaf);
|
|
|
|
/* These trees must never be empty */
|
|
if (unlikely(owner == BTRFS_ROOT_TREE_OBJECTID ||
|
|
owner == BTRFS_CHUNK_TREE_OBJECTID ||
|
|
owner == BTRFS_DEV_TREE_OBJECTID ||
|
|
owner == BTRFS_FS_TREE_OBJECTID ||
|
|
owner == BTRFS_DATA_RELOC_TREE_OBJECTID)) {
|
|
generic_err(leaf, 0,
|
|
"invalid root, root %llu must never be empty",
|
|
owner);
|
|
return -EUCLEAN;
|
|
}
|
|
|
|
/* Unknown tree */
|
|
if (unlikely(owner == 0)) {
|
|
generic_err(leaf, 0,
|
|
"invalid owner, root 0 is not defined");
|
|
return -EUCLEAN;
|
|
}
|
|
|
|
/* EXTENT_TREE_V2 can have empty extent trees. */
|
|
if (btrfs_fs_incompat(fs_info, EXTENT_TREE_V2))
|
|
return 0;
|
|
|
|
if (unlikely(owner == BTRFS_EXTENT_TREE_OBJECTID)) {
|
|
generic_err(leaf, 0,
|
|
"invalid root, root %llu must never be empty",
|
|
owner);
|
|
return -EUCLEAN;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
if (unlikely(nritems == 0))
|
|
return 0;
|
|
|
|
/*
|
|
* Check the following things to make sure this is a good leaf, and
|
|
* leaf users won't need to bother with similar sanity checks:
|
|
*
|
|
* 1) key ordering
|
|
* 2) item offset and size
|
|
* No overlap, no hole, all inside the leaf.
|
|
* 3) item content
|
|
* If possible, do comprehensive sanity check.
|
|
* NOTE: All checks must only rely on the item data itself.
|
|
*/
|
|
for (slot = 0; slot < nritems; slot++) {
|
|
u32 item_end_expected;
|
|
u64 item_data_end;
|
|
int ret;
|
|
|
|
btrfs_item_key_to_cpu(leaf, &key, slot);
|
|
|
|
/* Make sure the keys are in the right order */
|
|
if (unlikely(btrfs_comp_cpu_keys(&prev_key, &key) >= 0)) {
|
|
generic_err(leaf, slot,
|
|
"bad key order, prev (%llu %u %llu) current (%llu %u %llu)",
|
|
prev_key.objectid, prev_key.type,
|
|
prev_key.offset, key.objectid, key.type,
|
|
key.offset);
|
|
return -EUCLEAN;
|
|
}
|
|
|
|
item_data_end = (u64)btrfs_item_offset(leaf, slot) +
|
|
btrfs_item_size(leaf, slot);
|
|
/*
|
|
* Make sure the offset and ends are right, remember that the
|
|
* item data starts at the end of the leaf and grows towards the
|
|
* front.
|
|
*/
|
|
if (slot == 0)
|
|
item_end_expected = BTRFS_LEAF_DATA_SIZE(fs_info);
|
|
else
|
|
item_end_expected = btrfs_item_offset(leaf,
|
|
slot - 1);
|
|
if (unlikely(item_data_end != item_end_expected)) {
|
|
generic_err(leaf, slot,
|
|
"unexpected item end, have %llu expect %u",
|
|
item_data_end, item_end_expected);
|
|
return -EUCLEAN;
|
|
}
|
|
|
|
/*
|
|
* Check to make sure that we don't point outside of the leaf,
|
|
* just in case all the items are consistent to each other, but
|
|
* all point outside of the leaf.
|
|
*/
|
|
if (unlikely(item_data_end > BTRFS_LEAF_DATA_SIZE(fs_info))) {
|
|
generic_err(leaf, slot,
|
|
"slot end outside of leaf, have %llu expect range [0, %u]",
|
|
item_data_end, BTRFS_LEAF_DATA_SIZE(fs_info));
|
|
return -EUCLEAN;
|
|
}
|
|
|
|
/* Also check if the item pointer overlaps with btrfs item. */
|
|
if (unlikely(btrfs_item_ptr_offset(leaf, slot) <
|
|
btrfs_item_nr_offset(slot) + sizeof(struct btrfs_item))) {
|
|
generic_err(leaf, slot,
|
|
"slot overlaps with its data, item end %lu data start %lu",
|
|
btrfs_item_nr_offset(slot) +
|
|
sizeof(struct btrfs_item),
|
|
btrfs_item_ptr_offset(leaf, slot));
|
|
return -EUCLEAN;
|
|
}
|
|
|
|
if (check_item_data) {
|
|
/*
|
|
* Check if the item size and content meet other
|
|
* criteria
|
|
*/
|
|
ret = check_leaf_item(leaf, &key, slot, &prev_key);
|
|
if (unlikely(ret < 0))
|
|
return ret;
|
|
}
|
|
|
|
prev_key.objectid = key.objectid;
|
|
prev_key.type = key.type;
|
|
prev_key.offset = key.offset;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
int btrfs_check_leaf_full(struct extent_buffer *leaf)
|
|
{
|
|
return check_leaf(leaf, true);
|
|
}
|
|
ALLOW_ERROR_INJECTION(btrfs_check_leaf_full, ERRNO);
|
|
|
|
int btrfs_check_leaf_relaxed(struct extent_buffer *leaf)
|
|
{
|
|
return check_leaf(leaf, false);
|
|
}
|
|
|
|
int btrfs_check_node(struct extent_buffer *node)
|
|
{
|
|
struct btrfs_fs_info *fs_info = node->fs_info;
|
|
unsigned long nr = btrfs_header_nritems(node);
|
|
struct btrfs_key key, next_key;
|
|
int slot;
|
|
int level = btrfs_header_level(node);
|
|
u64 bytenr;
|
|
int ret = 0;
|
|
|
|
if (unlikely(level <= 0 || level >= BTRFS_MAX_LEVEL)) {
|
|
generic_err(node, 0,
|
|
"invalid level for node, have %d expect [1, %d]",
|
|
level, BTRFS_MAX_LEVEL - 1);
|
|
return -EUCLEAN;
|
|
}
|
|
if (unlikely(nr == 0 || nr > BTRFS_NODEPTRS_PER_BLOCK(fs_info))) {
|
|
btrfs_crit(fs_info,
|
|
"corrupt node: root=%llu block=%llu, nritems too %s, have %lu expect range [1,%u]",
|
|
btrfs_header_owner(node), node->start,
|
|
nr == 0 ? "small" : "large", nr,
|
|
BTRFS_NODEPTRS_PER_BLOCK(fs_info));
|
|
return -EUCLEAN;
|
|
}
|
|
|
|
for (slot = 0; slot < nr - 1; slot++) {
|
|
bytenr = btrfs_node_blockptr(node, slot);
|
|
btrfs_node_key_to_cpu(node, &key, slot);
|
|
btrfs_node_key_to_cpu(node, &next_key, slot + 1);
|
|
|
|
if (unlikely(!bytenr)) {
|
|
generic_err(node, slot,
|
|
"invalid NULL node pointer");
|
|
ret = -EUCLEAN;
|
|
goto out;
|
|
}
|
|
if (unlikely(!IS_ALIGNED(bytenr, fs_info->sectorsize))) {
|
|
generic_err(node, slot,
|
|
"unaligned pointer, have %llu should be aligned to %u",
|
|
bytenr, fs_info->sectorsize);
|
|
ret = -EUCLEAN;
|
|
goto out;
|
|
}
|
|
|
|
if (unlikely(btrfs_comp_cpu_keys(&key, &next_key) >= 0)) {
|
|
generic_err(node, slot,
|
|
"bad key order, current (%llu %u %llu) next (%llu %u %llu)",
|
|
key.objectid, key.type, key.offset,
|
|
next_key.objectid, next_key.type,
|
|
next_key.offset);
|
|
ret = -EUCLEAN;
|
|
goto out;
|
|
}
|
|
}
|
|
out:
|
|
return ret;
|
|
}
|
|
ALLOW_ERROR_INJECTION(btrfs_check_node, ERRNO);
|
|
|
|
int btrfs_check_eb_owner(const struct extent_buffer *eb, u64 root_owner)
|
|
{
|
|
const bool is_subvol = is_fstree(root_owner);
|
|
const u64 eb_owner = btrfs_header_owner(eb);
|
|
|
|
/*
|
|
* Skip dummy fs, as selftests don't create unique ebs for each dummy
|
|
* root.
|
|
*/
|
|
if (test_bit(BTRFS_FS_STATE_DUMMY_FS_INFO, &eb->fs_info->fs_state))
|
|
return 0;
|
|
/*
|
|
* There are several call sites (backref walking, qgroup, and data
|
|
* reloc) passing 0 as @root_owner, as they are not holding the
|
|
* tree root. In that case, we can not do a reliable ownership check,
|
|
* so just exit.
|
|
*/
|
|
if (root_owner == 0)
|
|
return 0;
|
|
/*
|
|
* These trees use key.offset as their owner, our callers don't have
|
|
* the extra capacity to pass key.offset here. So we just skip them.
|
|
*/
|
|
if (root_owner == BTRFS_TREE_LOG_OBJECTID ||
|
|
root_owner == BTRFS_TREE_RELOC_OBJECTID)
|
|
return 0;
|
|
|
|
if (!is_subvol) {
|
|
/* For non-subvolume trees, the eb owner should match root owner */
|
|
if (unlikely(root_owner != eb_owner)) {
|
|
btrfs_crit(eb->fs_info,
|
|
"corrupted %s, root=%llu block=%llu owner mismatch, have %llu expect %llu",
|
|
btrfs_header_level(eb) == 0 ? "leaf" : "node",
|
|
root_owner, btrfs_header_bytenr(eb), eb_owner,
|
|
root_owner);
|
|
return -EUCLEAN;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* For subvolume trees, owners can mismatch, but they should all belong
|
|
* to subvolume trees.
|
|
*/
|
|
if (unlikely(is_subvol != is_fstree(eb_owner))) {
|
|
btrfs_crit(eb->fs_info,
|
|
"corrupted %s, root=%llu block=%llu owner mismatch, have %llu expect [%llu, %llu]",
|
|
btrfs_header_level(eb) == 0 ? "leaf" : "node",
|
|
root_owner, btrfs_header_bytenr(eb), eb_owner,
|
|
BTRFS_FIRST_FREE_OBJECTID, BTRFS_LAST_FREE_OBJECTID);
|
|
return -EUCLEAN;
|
|
}
|
|
return 0;
|
|
}
|