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third_party_f2fs-tools/fsck/fsck.h
Robin Hsu e66e4c1f3b fsck: prevent buffer overrun in quota code 
A maliciously corrupted file systems can trigger buffer overruns in
the quota code used by fsck.

To fix it, quota file sizes are checked against real allocated
block index tables (inode, direct nodes, indirect nodes, double
indirect nodes).  If the size mismatches, the quota file is considered
corrupted and will be regenerated.

Signed-off-by: Robin Hsu <robinhsu@google.com>
Signed-off-by: Jaegeuk Kim <jaegeuk@kernel.org>
2020-06-23 16:58:44 -07:00

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/**
* fsck.h
*
* Copyright (c) 2013 Samsung Electronics Co., Ltd.
* http://www.samsung.com/
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 as
* published by the Free Software Foundation.
*/
#ifndef _FSCK_H_
#define _FSCK_H_
#include "f2fs.h"
struct quota_ctx;
#define FSCK_UNMATCHED_EXTENT 0x00000001
#define FSCK_INLINE_INODE 0x00000002
enum {
PREEN_MODE_0,
PREEN_MODE_1,
PREEN_MODE_2,
PREEN_MODE_MAX
};
enum {
NOERROR,
EWRONG_OPT,
ENEED_ARG,
EUNKNOWN_OPT,
EUNKNOWN_ARG,
};
enum SB_ADDR {
SB0_ADDR = 0,
SB1_ADDR,
SB_MAX_ADDR,
};
#define SB_MASK(i) (1 << i)
#define SB_MASK_ALL (SB_MASK(SB0_ADDR) | SB_MASK(SB1_ADDR))
/* fsck.c */
struct orphan_info {
u32 nr_inodes;
u32 *ino_list;
};
struct extent_info {
u32 fofs; /* start offset in a file */
u32 blk; /* start block address of the extent */
u32 len; /* length of the extent */
};
struct child_info {
u32 state;
u32 links;
u32 files;
u32 pgofs;
u8 dots;
u8 dir_level;
u32 p_ino; /*parent ino*/
u32 pp_ino; /*parent parent ino*/
struct extent_info ei;
u32 last_blk;
u32 i_namelen; /* dentry namelen */
};
struct f2fs_fsck {
struct f2fs_sb_info sbi;
struct orphan_info orphani;
struct chk_result {
u64 valid_blk_cnt;
u32 valid_nat_entry_cnt;
u32 valid_node_cnt;
u32 valid_inode_cnt;
u32 multi_hard_link_files;
u64 sit_valid_blocks;
u32 sit_free_segs;
u32 wp_fixed;
u32 wp_inconsistent_zones;
} chk;
struct hard_link_node *hard_link_list_head;
char *main_seg_usage;
char *main_area_bitmap;
char *nat_area_bitmap;
char *sit_area_bitmap;
u64 main_area_bitmap_sz;
u32 nat_area_bitmap_sz;
u32 sit_area_bitmap_sz;
u64 nr_main_blks;
u32 nr_nat_entries;
u32 dentry_depth;
struct f2fs_nat_entry *entries;
u32 nat_valid_inode_cnt;
struct quota_ctx *qctx;
};
#define BLOCK_SZ 4096
struct block {
unsigned char buf[BLOCK_SZ];
};
enum NODE_TYPE {
TYPE_INODE = 37,
TYPE_DIRECT_NODE = 43,
TYPE_INDIRECT_NODE = 53,
TYPE_DOUBLE_INDIRECT_NODE = 67,
TYPE_XATTR = 77
};
struct hard_link_node {
u32 nid;
u32 links;
u32 actual_links;
struct hard_link_node *next;
};
enum seg_type {
SEG_TYPE_DATA,
SEG_TYPE_CUR_DATA,
SEG_TYPE_NODE,
SEG_TYPE_CUR_NODE,
SEG_TYPE_MAX,
};
struct selabel_handle;
static inline bool need_fsync_data_record(struct f2fs_sb_info *sbi)
{
return !is_set_ckpt_flags(F2FS_CKPT(sbi), CP_UMOUNT_FLAG) ||
c.zoned_model == F2FS_ZONED_HM;
}
extern int fsck_chk_orphan_node(struct f2fs_sb_info *);
extern int fsck_chk_quota_node(struct f2fs_sb_info *);
extern int fsck_chk_quota_files(struct f2fs_sb_info *);
extern int fsck_sanity_check_nid(struct f2fs_sb_info *, u32,
struct f2fs_node *, enum FILE_TYPE, enum NODE_TYPE,
struct node_info *);
extern int fsck_chk_node_blk(struct f2fs_sb_info *, struct f2fs_inode *, u32,
enum FILE_TYPE, enum NODE_TYPE, u32 *,
struct child_info *);
extern void fsck_chk_inode_blk(struct f2fs_sb_info *, u32, enum FILE_TYPE,
struct f2fs_node *, u32 *, struct node_info *, struct child_info *);
extern int fsck_chk_dnode_blk(struct f2fs_sb_info *, struct f2fs_inode *,
u32, enum FILE_TYPE, struct f2fs_node *, u32 *,
struct child_info *, struct node_info *);
extern int fsck_chk_idnode_blk(struct f2fs_sb_info *, struct f2fs_inode *,
enum FILE_TYPE, struct f2fs_node *, u32 *, struct child_info *);
extern int fsck_chk_didnode_blk(struct f2fs_sb_info *, struct f2fs_inode *,
enum FILE_TYPE, struct f2fs_node *, u32 *, struct child_info *);
extern int fsck_chk_data_blk(struct f2fs_sb_info *, int,
u32, struct child_info *, int, enum FILE_TYPE, u32, u16, u8, int);
extern int fsck_chk_dentry_blk(struct f2fs_sb_info *, int,
u32, struct child_info *, int, int);
int fsck_chk_inline_dentries(struct f2fs_sb_info *, struct f2fs_node *,
struct child_info *);
void fsck_chk_checkpoint(struct f2fs_sb_info *sbi);
int fsck_chk_meta(struct f2fs_sb_info *sbi);
void fsck_chk_and_fix_write_pointers(struct f2fs_sb_info *);
int fsck_chk_curseg_info(struct f2fs_sb_info *);
void pretty_print_filename(const u8 *raw_name, u32 len,
char out[F2FS_PRINT_NAMELEN], int enc_name);
extern void update_free_segments(struct f2fs_sb_info *);
void print_cp_state(u32);
extern void print_node_info(struct f2fs_sb_info *, struct f2fs_node *, int);
extern void print_inode_info(struct f2fs_sb_info *, struct f2fs_node *, int);
extern struct seg_entry *get_seg_entry(struct f2fs_sb_info *, unsigned int);
extern struct f2fs_summary_block *get_sum_block(struct f2fs_sb_info *,
unsigned int, int *);
extern int get_sum_entry(struct f2fs_sb_info *, u32, struct f2fs_summary *);
extern void update_sum_entry(struct f2fs_sb_info *, block_t,
struct f2fs_summary *);
extern void get_node_info(struct f2fs_sb_info *, nid_t, struct node_info *);
extern void nullify_nat_entry(struct f2fs_sb_info *, u32);
extern void rewrite_sit_area_bitmap(struct f2fs_sb_info *);
extern void build_nat_area_bitmap(struct f2fs_sb_info *);
extern void build_sit_area_bitmap(struct f2fs_sb_info *);
extern int f2fs_set_main_bitmap(struct f2fs_sb_info *, u32, int);
extern int f2fs_set_sit_bitmap(struct f2fs_sb_info *, u32);
extern void fsck_init(struct f2fs_sb_info *);
extern int fsck_verify(struct f2fs_sb_info *);
extern void fsck_free(struct f2fs_sb_info *);
extern int f2fs_ra_meta_pages(struct f2fs_sb_info *, block_t, int, int);
extern int f2fs_do_mount(struct f2fs_sb_info *);
extern void f2fs_do_umount(struct f2fs_sb_info *);
extern int f2fs_sparse_initialize_meta(struct f2fs_sb_info *);
extern void flush_journal_entries(struct f2fs_sb_info *);
extern void update_curseg_info(struct f2fs_sb_info *, int);
extern void zero_journal_entries(struct f2fs_sb_info *);
extern void flush_sit_entries(struct f2fs_sb_info *);
extern void move_curseg_info(struct f2fs_sb_info *, u64, int);
extern void write_curseg_info(struct f2fs_sb_info *);
extern int find_next_free_block(struct f2fs_sb_info *, u64 *, int, int, bool);
extern void duplicate_checkpoint(struct f2fs_sb_info *);
extern void write_checkpoint(struct f2fs_sb_info *);
extern void write_checkpoints(struct f2fs_sb_info *);
extern void update_superblock(struct f2fs_super_block *, int);
extern void update_data_blkaddr(struct f2fs_sb_info *, nid_t, u16, block_t);
extern void update_nat_blkaddr(struct f2fs_sb_info *, nid_t, nid_t, block_t);
extern void print_raw_sb_info(struct f2fs_super_block *);
extern pgoff_t current_nat_addr(struct f2fs_sb_info *, nid_t, int *);
extern u32 get_free_segments(struct f2fs_sb_info *);
extern void get_current_sit_page(struct f2fs_sb_info *,
unsigned int, struct f2fs_sit_block *);
extern void rewrite_current_sit_page(struct f2fs_sb_info *, unsigned int,
struct f2fs_sit_block *);
extern u32 update_nat_bits_flags(struct f2fs_super_block *,
struct f2fs_checkpoint *, u32);
extern void write_nat_bits(struct f2fs_sb_info *, struct f2fs_super_block *,
struct f2fs_checkpoint *, int);
/* dump.c */
struct dump_option {
nid_t nid;
nid_t start_nat;
nid_t end_nat;
int start_sit;
int end_sit;
int start_ssa;
int end_ssa;
int32_t blk_addr;
};
extern void nat_dump(struct f2fs_sb_info *, nid_t, nid_t);
extern void sit_dump(struct f2fs_sb_info *, unsigned int, unsigned int);
extern void ssa_dump(struct f2fs_sb_info *, int, int);
extern void dump_node(struct f2fs_sb_info *, nid_t, int);
extern int dump_info_from_blkaddr(struct f2fs_sb_info *, u32);
extern unsigned int start_bidx_of_node(unsigned int, struct f2fs_node *);
/* defrag.c */
int f2fs_defragment(struct f2fs_sb_info *, u64, u64, u64, int);
/* resize.c */
int f2fs_resize(struct f2fs_sb_info *);
/* sload.c */
int f2fs_sload(struct f2fs_sb_info *);
/* segment.c */
int reserve_new_block(struct f2fs_sb_info *, block_t *,
struct f2fs_summary *, int, bool);
int new_data_block(struct f2fs_sb_info *, void *,
struct dnode_of_data *, int);
int f2fs_build_file(struct f2fs_sb_info *, struct dentry *);
void f2fs_alloc_nid(struct f2fs_sb_info *, nid_t *);
void set_data_blkaddr(struct dnode_of_data *);
block_t new_node_block(struct f2fs_sb_info *,
struct dnode_of_data *, unsigned int);
/* segment.c */
struct quota_file;
u64 f2fs_quota_size(struct quota_file *);
u64 f2fs_read(struct f2fs_sb_info *, nid_t, u8 *, u64, pgoff_t);
u64 f2fs_write(struct f2fs_sb_info *, nid_t, u8 *, u64, pgoff_t);
void f2fs_filesize_update(struct f2fs_sb_info *, nid_t, u64);
int get_dnode_of_data(struct f2fs_sb_info *, struct dnode_of_data *,
pgoff_t, int);
void make_dentry_ptr(struct f2fs_dentry_ptr *, struct f2fs_node *, void *, int);
int f2fs_create(struct f2fs_sb_info *, struct dentry *);
int f2fs_mkdir(struct f2fs_sb_info *, struct dentry *);
int f2fs_symlink(struct f2fs_sb_info *, struct dentry *);
int inode_set_selinux(struct f2fs_sb_info *, u32, const char *);
int f2fs_find_path(struct f2fs_sb_info *, char *, nid_t *);
nid_t f2fs_lookup(struct f2fs_sb_info *, struct f2fs_node *, u8 *, int);
int f2fs_add_link(struct f2fs_sb_info *, struct f2fs_node *,
const unsigned char *, int, nid_t, int, block_t, int);
/* xattr.c */
void *read_all_xattrs(struct f2fs_sb_info *, struct f2fs_node *);
#endif /* _FSCK_H_ */
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