mirror of
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
synced 2024-11-01 08:58:07 +00:00
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 */
|
|
|
|
#ifndef __FAST_COMMIT_H__
|
|
#define __FAST_COMMIT_H__
|
|
|
|
/*
|
|
* Note this file is present in e2fsprogs/lib/ext2fs/fast_commit.h and
|
|
* linux/fs/ext4/fast_commit.h. These file should always be byte identical.
|
|
*/
|
|
|
|
/* Fast commit tags */
|
|
#define EXT4_FC_TAG_ADD_RANGE 0x0001
|
|
#define EXT4_FC_TAG_DEL_RANGE 0x0002
|
|
#define EXT4_FC_TAG_CREAT 0x0003
|
|
#define EXT4_FC_TAG_LINK 0x0004
|
|
#define EXT4_FC_TAG_UNLINK 0x0005
|
|
#define EXT4_FC_TAG_INODE 0x0006
|
|
#define EXT4_FC_TAG_PAD 0x0007
|
|
#define EXT4_FC_TAG_TAIL 0x0008
|
|
#define EXT4_FC_TAG_HEAD 0x0009
|
|
|
|
#define EXT4_FC_SUPPORTED_FEATURES 0x0
|
|
|
|
/* On disk fast commit tlv value structures */
|
|
|
|
/* Fast commit on disk tag length structure */
|
|
struct ext4_fc_tl {
|
|
__le16 fc_tag;
|
|
__le16 fc_len;
|
|
};
|
|
|
|
/* Value structure for tag EXT4_FC_TAG_HEAD. */
|
|
struct ext4_fc_head {
|
|
__le32 fc_features;
|
|
__le32 fc_tid;
|
|
};
|
|
|
|
/* Value structure for EXT4_FC_TAG_ADD_RANGE. */
|
|
struct ext4_fc_add_range {
|
|
__le32 fc_ino;
|
|
__u8 fc_ex[12];
|
|
};
|
|
|
|
/* Value structure for tag EXT4_FC_TAG_DEL_RANGE. */
|
|
struct ext4_fc_del_range {
|
|
__le32 fc_ino;
|
|
__le32 fc_lblk;
|
|
__le32 fc_len;
|
|
};
|
|
|
|
/*
|
|
* This is the value structure for tags EXT4_FC_TAG_CREAT, EXT4_FC_TAG_LINK
|
|
* and EXT4_FC_TAG_UNLINK.
|
|
*/
|
|
struct ext4_fc_dentry_info {
|
|
__le32 fc_parent_ino;
|
|
__le32 fc_ino;
|
|
__u8 fc_dname[];
|
|
};
|
|
|
|
/* Value structure for EXT4_FC_TAG_INODE. */
|
|
struct ext4_fc_inode {
|
|
__le32 fc_ino;
|
|
__u8 fc_raw_inode[];
|
|
};
|
|
|
|
/* Value structure for tag EXT4_FC_TAG_TAIL. */
|
|
struct ext4_fc_tail {
|
|
__le32 fc_tid;
|
|
__le32 fc_crc;
|
|
};
|
|
|
|
/* Tag base length */
|
|
#define EXT4_FC_TAG_BASE_LEN (sizeof(struct ext4_fc_tl))
|
|
|
|
/*
|
|
* Fast commit status codes
|
|
*/
|
|
enum {
|
|
EXT4_FC_STATUS_OK = 0,
|
|
EXT4_FC_STATUS_INELIGIBLE,
|
|
EXT4_FC_STATUS_SKIPPED,
|
|
EXT4_FC_STATUS_FAILED,
|
|
};
|
|
|
|
/*
|
|
* Fast commit ineligiblity reasons:
|
|
*/
|
|
enum {
|
|
EXT4_FC_REASON_XATTR = 0,
|
|
EXT4_FC_REASON_CROSS_RENAME,
|
|
EXT4_FC_REASON_JOURNAL_FLAG_CHANGE,
|
|
EXT4_FC_REASON_NOMEM,
|
|
EXT4_FC_REASON_SWAP_BOOT,
|
|
EXT4_FC_REASON_RESIZE,
|
|
EXT4_FC_REASON_RENAME_DIR,
|
|
EXT4_FC_REASON_FALLOC_RANGE,
|
|
EXT4_FC_REASON_INODE_JOURNAL_DATA,
|
|
EXT4_FC_REASON_ENCRYPTED_FILENAME,
|
|
EXT4_FC_REASON_MAX
|
|
};
|
|
|
|
#ifdef __KERNEL__
|
|
/*
|
|
* In memory list of dentry updates that are performed on the file
|
|
* system used by fast commit code.
|
|
*/
|
|
struct ext4_fc_dentry_update {
|
|
int fcd_op; /* Type of update create / unlink / link */
|
|
int fcd_parent; /* Parent inode number */
|
|
int fcd_ino; /* Inode number */
|
|
struct qstr fcd_name; /* Dirent name */
|
|
unsigned char fcd_iname[DNAME_INLINE_LEN]; /* Dirent name string */
|
|
struct list_head fcd_list;
|
|
struct list_head fcd_dilist;
|
|
};
|
|
|
|
struct ext4_fc_stats {
|
|
unsigned int fc_ineligible_reason_count[EXT4_FC_REASON_MAX];
|
|
unsigned long fc_num_commits;
|
|
unsigned long fc_ineligible_commits;
|
|
unsigned long fc_failed_commits;
|
|
unsigned long fc_skipped_commits;
|
|
unsigned long fc_numblks;
|
|
u64 s_fc_avg_commit_time;
|
|
};
|
|
|
|
#define EXT4_FC_REPLAY_REALLOC_INCREMENT 4
|
|
|
|
/*
|
|
* Physical block regions added to different inodes due to fast commit
|
|
* recovery. These are set during the SCAN phase. During the replay phase,
|
|
* our allocator excludes these from its allocation. This ensures that
|
|
* we don't accidentally allocating a block that is going to be used by
|
|
* another inode.
|
|
*/
|
|
struct ext4_fc_alloc_region {
|
|
ext4_lblk_t lblk;
|
|
ext4_fsblk_t pblk;
|
|
int ino, len;
|
|
};
|
|
|
|
/*
|
|
* Fast commit replay state.
|
|
*/
|
|
struct ext4_fc_replay_state {
|
|
int fc_replay_num_tags;
|
|
int fc_replay_expected_off;
|
|
int fc_current_pass;
|
|
int fc_cur_tag;
|
|
int fc_crc;
|
|
struct ext4_fc_alloc_region *fc_regions;
|
|
int fc_regions_size, fc_regions_used, fc_regions_valid;
|
|
int *fc_modified_inodes;
|
|
int fc_modified_inodes_used, fc_modified_inodes_size;
|
|
};
|
|
|
|
#define region_last(__region) (((__region)->lblk) + ((__region)->len) - 1)
|
|
#endif
|
|
|
|
static inline const char *tag2str(__u16 tag)
|
|
{
|
|
switch (tag) {
|
|
case EXT4_FC_TAG_LINK:
|
|
return "ADD_ENTRY";
|
|
case EXT4_FC_TAG_UNLINK:
|
|
return "DEL_ENTRY";
|
|
case EXT4_FC_TAG_ADD_RANGE:
|
|
return "ADD_RANGE";
|
|
case EXT4_FC_TAG_CREAT:
|
|
return "CREAT_DENTRY";
|
|
case EXT4_FC_TAG_DEL_RANGE:
|
|
return "DEL_RANGE";
|
|
case EXT4_FC_TAG_INODE:
|
|
return "INODE";
|
|
case EXT4_FC_TAG_PAD:
|
|
return "PAD";
|
|
case EXT4_FC_TAG_TAIL:
|
|
return "TAIL";
|
|
case EXT4_FC_TAG_HEAD:
|
|
return "HEAD";
|
|
default:
|
|
return "ERROR";
|
|
}
|
|
}
|
|
|
|
#endif /* __FAST_COMMIT_H__ */
|