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64b4a25c3d
Validate the inode and filename lengths in fast-commit journal records
so that a malicious fast-commit journal cannot cause a crash by having
invalid values for these. Also validate EXT4_FC_TAG_DEL_RANGE.
Fixes: aa75f4d3da ("ext4: main fast-commit commit path")
Cc: <stable@vger.kernel.org> # v5.10+
Signed-off-by: Eric Biggers <ebiggers@google.com>
Link: https://lore.kernel.org/r/20221106224841.279231-5-ebiggers@kernel.org
Signed-off-by: Theodore Ts'o <tytso@mit.edu>
187 lines
4.2 KiB
C
187 lines
4.2 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
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#ifndef __FAST_COMMIT_H__
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#define __FAST_COMMIT_H__
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/*
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* Note this file is present in e2fsprogs/lib/ext2fs/fast_commit.h and
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* linux/fs/ext4/fast_commit.h. These file should always be byte identical.
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*/
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/* Fast commit tags */
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#define EXT4_FC_TAG_ADD_RANGE 0x0001
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#define EXT4_FC_TAG_DEL_RANGE 0x0002
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#define EXT4_FC_TAG_CREAT 0x0003
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#define EXT4_FC_TAG_LINK 0x0004
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#define EXT4_FC_TAG_UNLINK 0x0005
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#define EXT4_FC_TAG_INODE 0x0006
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#define EXT4_FC_TAG_PAD 0x0007
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#define EXT4_FC_TAG_TAIL 0x0008
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#define EXT4_FC_TAG_HEAD 0x0009
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#define EXT4_FC_SUPPORTED_FEATURES 0x0
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/* On disk fast commit tlv value structures */
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/* Fast commit on disk tag length structure */
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struct ext4_fc_tl {
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__le16 fc_tag;
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__le16 fc_len;
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};
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/* Value structure for tag EXT4_FC_TAG_HEAD. */
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struct ext4_fc_head {
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__le32 fc_features;
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__le32 fc_tid;
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};
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/* Value structure for EXT4_FC_TAG_ADD_RANGE. */
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struct ext4_fc_add_range {
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__le32 fc_ino;
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__u8 fc_ex[12];
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};
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/* Value structure for tag EXT4_FC_TAG_DEL_RANGE. */
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struct ext4_fc_del_range {
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__le32 fc_ino;
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__le32 fc_lblk;
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__le32 fc_len;
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};
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/*
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* This is the value structure for tags EXT4_FC_TAG_CREAT, EXT4_FC_TAG_LINK
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* and EXT4_FC_TAG_UNLINK.
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*/
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struct ext4_fc_dentry_info {
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__le32 fc_parent_ino;
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__le32 fc_ino;
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__u8 fc_dname[];
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};
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/* Value structure for EXT4_FC_TAG_INODE. */
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struct ext4_fc_inode {
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__le32 fc_ino;
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__u8 fc_raw_inode[];
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};
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/* Value structure for tag EXT4_FC_TAG_TAIL. */
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struct ext4_fc_tail {
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__le32 fc_tid;
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__le32 fc_crc;
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};
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/* Tag base length */
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#define EXT4_FC_TAG_BASE_LEN (sizeof(struct ext4_fc_tl))
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/*
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* Fast commit status codes
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*/
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enum {
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EXT4_FC_STATUS_OK = 0,
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EXT4_FC_STATUS_INELIGIBLE,
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EXT4_FC_STATUS_SKIPPED,
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EXT4_FC_STATUS_FAILED,
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};
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/*
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* Fast commit ineligiblity reasons:
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*/
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enum {
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EXT4_FC_REASON_XATTR = 0,
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EXT4_FC_REASON_CROSS_RENAME,
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EXT4_FC_REASON_JOURNAL_FLAG_CHANGE,
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EXT4_FC_REASON_NOMEM,
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EXT4_FC_REASON_SWAP_BOOT,
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EXT4_FC_REASON_RESIZE,
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EXT4_FC_REASON_RENAME_DIR,
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EXT4_FC_REASON_FALLOC_RANGE,
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EXT4_FC_REASON_INODE_JOURNAL_DATA,
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EXT4_FC_REASON_ENCRYPTED_FILENAME,
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EXT4_FC_REASON_MAX
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};
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#ifdef __KERNEL__
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/*
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* In memory list of dentry updates that are performed on the file
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* system used by fast commit code.
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*/
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struct ext4_fc_dentry_update {
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int fcd_op; /* Type of update create / unlink / link */
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int fcd_parent; /* Parent inode number */
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int fcd_ino; /* Inode number */
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struct qstr fcd_name; /* Dirent name */
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unsigned char fcd_iname[DNAME_INLINE_LEN]; /* Dirent name string */
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struct list_head fcd_list;
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struct list_head fcd_dilist;
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};
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struct ext4_fc_stats {
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unsigned int fc_ineligible_reason_count[EXT4_FC_REASON_MAX];
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unsigned long fc_num_commits;
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unsigned long fc_ineligible_commits;
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unsigned long fc_failed_commits;
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unsigned long fc_skipped_commits;
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unsigned long fc_numblks;
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u64 s_fc_avg_commit_time;
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};
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#define EXT4_FC_REPLAY_REALLOC_INCREMENT 4
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/*
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* Physical block regions added to different inodes due to fast commit
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* recovery. These are set during the SCAN phase. During the replay phase,
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* our allocator excludes these from its allocation. This ensures that
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* we don't accidentally allocating a block that is going to be used by
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* another inode.
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*/
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struct ext4_fc_alloc_region {
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ext4_lblk_t lblk;
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ext4_fsblk_t pblk;
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int ino, len;
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};
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/*
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* Fast commit replay state.
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*/
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struct ext4_fc_replay_state {
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int fc_replay_num_tags;
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int fc_replay_expected_off;
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int fc_current_pass;
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int fc_cur_tag;
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int fc_crc;
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struct ext4_fc_alloc_region *fc_regions;
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int fc_regions_size, fc_regions_used, fc_regions_valid;
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int *fc_modified_inodes;
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int fc_modified_inodes_used, fc_modified_inodes_size;
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};
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#define region_last(__region) (((__region)->lblk) + ((__region)->len) - 1)
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#endif
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static inline const char *tag2str(__u16 tag)
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{
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switch (tag) {
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case EXT4_FC_TAG_LINK:
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return "ADD_ENTRY";
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case EXT4_FC_TAG_UNLINK:
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return "DEL_ENTRY";
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case EXT4_FC_TAG_ADD_RANGE:
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return "ADD_RANGE";
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case EXT4_FC_TAG_CREAT:
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return "CREAT_DENTRY";
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case EXT4_FC_TAG_DEL_RANGE:
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return "DEL_RANGE";
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case EXT4_FC_TAG_INODE:
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return "INODE";
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case EXT4_FC_TAG_PAD:
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return "PAD";
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case EXT4_FC_TAG_TAIL:
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return "TAIL";
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case EXT4_FC_TAG_HEAD:
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return "HEAD";
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default:
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return "ERROR";
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}
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}
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#endif /* __FAST_COMMIT_H__ */
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