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- Handle vendor extension and allocation entries as unrecognized benign secondary entries.
 - Fix wrong ->i_blocks on devices with non-512 byte sector.
 - Add the check to avoid returning -EIO from exfat_readdir() at current position exceeding the directory size.
 - Fix a bug that reach the end of the directory stream at a position not aligned with the dentry size.
 - Redefine DIR_DELETED as 0xFFFFFFF7, the bad cluster number.
 - Two cleanup fixes and fix cluster leakage in error handling.
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Merge tag 'exfat-for-6.3-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/linkinjeon/exfat

Pull exfat updates from Namjae Jeon:

 - Handle vendor extension and allocation entries as unrecognized benign
   secondary entries

 - Fix wrong ->i_blocks on devices with non-512 byte sector

 - Add the check to avoid returning -EIO from exfat_readdir() at current
   position exceeding the directory size

 - Fix a bug that reach the end of the directory stream at a position
   not aligned with the dentry size

 - Redefine DIR_DELETED as 0xFFFFFFF7, the bad cluster number

 - Two cleanup fixes and fix cluster leakage in error handling

* tag 'exfat-for-6.3-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/linkinjeon/exfat:
  exfat: fix the newly allocated clusters are not freed in error handling
  exfat: don't print error log in normal case
  exfat: remove unneeded code from exfat_alloc_cluster()
  exfat: handle unreconized benign secondary entries
  exfat: fix inode->i_blocks for non-512 byte sector size device
  exfat: redefine DIR_DELETED as the bad cluster number
  exfat: fix reporting fs error when reading dir beyond EOF
  exfat: fix unexpected EOF while reading dir
This commit is contained in:
Linus Torvalds 2023-03-01 08:42:27 -08:00
commit e103ecedce
8 changed files with 101 additions and 60 deletions
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90
fs/exfat/dir.c
View File

@ -29,14 +29,15 @@ static int exfat_extract_uni_name(struct exfat_dentry *ep,
}
static void exfat_get_uniname_from_ext_entry(struct super_block *sb,
static int exfat_get_uniname_from_ext_entry(struct super_block *sb,
struct exfat_chain *p_dir, int entry, unsigned short *uniname)
{
int i;
int i, err;
struct exfat_entry_set_cache es;
if (exfat_get_dentry_set(&es, sb, p_dir, entry, ES_ALL_ENTRIES))
return;
err = exfat_get_dentry_set(&es, sb, p_dir, entry, ES_ALL_ENTRIES);
if (err)
return err;
/*
* First entry : file entry
@ -56,12 +57,13 @@ static void exfat_get_uniname_from_ext_entry(struct super_block *sb,
}
exfat_put_dentry_set(&es, false);
return 0;
}
/* read a directory entry from the opened directory */
static int exfat_readdir(struct inode *inode, loff_t *cpos, struct exfat_dir_entry *dir_entry)
{
int i, dentries_per_clu, num_ext;
int i, dentries_per_clu, num_ext, err;
unsigned int type, clu_offset, max_dentries;
struct exfat_chain dir, clu;
struct exfat_uni_name uni_name;
@ -100,7 +102,7 @@ static int exfat_readdir(struct inode *inode, loff_t *cpos, struct exfat_dir_ent
clu.dir = ei->hint_bmap.clu;
}
while (clu_offset > 0) {
while (clu_offset > 0 && clu.dir != EXFAT_EOF_CLUSTER) {
if (exfat_get_next_cluster(sb, &(clu.dir)))
return -EIO;
@ -146,8 +148,12 @@ static int exfat_readdir(struct inode *inode, loff_t *cpos, struct exfat_dir_ent
0);
*uni_name.name = 0x0;
exfat_get_uniname_from_ext_entry(sb, &clu, i,
err = exfat_get_uniname_from_ext_entry(sb, &clu, i,
uni_name.name);
if (err) {
brelse(bh);
continue;
}
exfat_utf16_to_nls(sb, &uni_name,
dir_entry->namebuf.lfn,
dir_entry->namebuf.lfnbuf_len);
@ -234,10 +240,7 @@ static int exfat_iterate(struct file *file, struct dir_context *ctx)
fake_offset = 1;
}
if (cpos & (DENTRY_SIZE - 1)) {
err = -ENOENT;
goto unlock;
}
cpos = round_up(cpos, DENTRY_SIZE);
/* name buffer should be allocated before use */
err = exfat_alloc_namebuf(nb);
@ -378,6 +381,12 @@ unsigned int exfat_get_entry_type(struct exfat_dentry *ep)
return TYPE_ACL;
return TYPE_CRITICAL_SEC;
}
if (ep->type == EXFAT_VENDOR_EXT)
return TYPE_VENDOR_EXT;
if (ep->type == EXFAT_VENDOR_ALLOC)
return TYPE_VENDOR_ALLOC;
return TYPE_BENIGN_SEC;
}
@ -521,6 +530,25 @@ release_fbh:
return ret;
}
static void exfat_free_benign_secondary_clusters(struct inode *inode,
struct exfat_dentry *ep)
{
struct super_block *sb = inode->i_sb;
struct exfat_chain dir;
unsigned int start_clu =
le32_to_cpu(ep->dentry.generic_secondary.start_clu);
u64 size = le64_to_cpu(ep->dentry.generic_secondary.size);
unsigned char flags = ep->dentry.generic_secondary.flags;
if (!(flags & ALLOC_POSSIBLE) || !start_clu || !size)
return;
exfat_chain_set(&dir, start_clu,
EXFAT_B_TO_CLU_ROUND_UP(size, EXFAT_SB(sb)),
flags);
exfat_free_cluster(inode, &dir);
}
int exfat_init_ext_entry(struct inode *inode, struct exfat_chain *p_dir,
int entry, int num_entries, struct exfat_uni_name *p_uniname)
{
@ -553,6 +581,9 @@ int exfat_init_ext_entry(struct inode *inode, struct exfat_chain *p_dir,
if (!ep)
return -EIO;
if (exfat_get_entry_type(ep) & TYPE_BENIGN_SEC)
exfat_free_benign_secondary_clusters(inode, ep);
exfat_init_name_entry(ep, uniname);
exfat_update_bh(bh, sync);
brelse(bh);
@ -576,6 +607,9 @@ int exfat_remove_entries(struct inode *inode, struct exfat_chain *p_dir,
if (!ep)
return -EIO;
if (exfat_get_entry_type(ep) & TYPE_BENIGN_SEC)
exfat_free_benign_secondary_clusters(inode, ep);
exfat_set_entry_type(ep, TYPE_DELETED);
exfat_update_bh(bh, IS_DIRSYNC(inode));
brelse(bh);
@ -744,6 +778,7 @@ enum exfat_validate_dentry_mode {
ES_MODE_GET_STRM_ENTRY,
ES_MODE_GET_NAME_ENTRY,
ES_MODE_GET_CRITICAL_SEC_ENTRY,
ES_MODE_GET_BENIGN_SEC_ENTRY,
};
static bool exfat_validate_entry(unsigned int type,
@ -757,36 +792,33 @@ static bool exfat_validate_entry(unsigned int type,
if (type != TYPE_FILE && type != TYPE_DIR)
return false;
*mode = ES_MODE_GET_FILE_ENTRY;
return true;
break;
case ES_MODE_GET_FILE_ENTRY:
if (type != TYPE_STREAM)
return false;
*mode = ES_MODE_GET_STRM_ENTRY;
return true;
break;
case ES_MODE_GET_STRM_ENTRY:
if (type != TYPE_EXTEND)
return false;
*mode = ES_MODE_GET_NAME_ENTRY;
return true;
break;
case ES_MODE_GET_NAME_ENTRY:
if (type == TYPE_STREAM)
if (type & TYPE_BENIGN_SEC)
*mode = ES_MODE_GET_BENIGN_SEC_ENTRY;
else if (type != TYPE_EXTEND)
return false;
if (type != TYPE_EXTEND) {
if (!(type & TYPE_CRITICAL_SEC))
break;
case ES_MODE_GET_BENIGN_SEC_ENTRY:
/* Assume unreconized benign secondary entry */
if (!(type & TYPE_BENIGN_SEC))
return false;
*mode = ES_MODE_GET_CRITICAL_SEC_ENTRY;
}
return true;
case ES_MODE_GET_CRITICAL_SEC_ENTRY:
if (type == TYPE_EXTEND || type == TYPE_STREAM)
return false;
if ((type & TYPE_CRITICAL_SEC) != TYPE_CRITICAL_SEC)
return false;
return true;
break;
default:
WARN_ON_ONCE(1);
return false;
}
return true;
}
struct exfat_dentry *exfat_get_dentry_cached(
@ -1167,10 +1199,8 @@ int exfat_count_ext_entries(struct super_block *sb, struct exfat_chain *p_dir,
type = exfat_get_entry_type(ext_ep);
brelse(bh);
if (type == TYPE_EXTEND || type == TYPE_STREAM)
if (type & TYPE_CRITICAL_SEC || type & TYPE_BENIGN_SEC)
count++;
else
break;
}
return count;
}

4
fs/exfat/exfat_fs.h
View File

@ -50,7 +50,7 @@ enum {
#define ES_IDX_LAST_FILENAME(name_len) \
(ES_IDX_FIRST_FILENAME + EXFAT_FILENAME_ENTRY_NUM(name_len) - 1)
#define DIR_DELETED 0xFFFF0321
#define DIR_DELETED 0xFFFFFFF7
/* type values */
#define TYPE_UNUSED 0x0000
@ -71,6 +71,8 @@ enum {
#define TYPE_PADDING 0x0402
#define TYPE_ACLTAB 0x0403
#define TYPE_BENIGN_SEC 0x0800
#define TYPE_VENDOR_EXT 0x0801
#define TYPE_VENDOR_ALLOC 0x0802
#define MAX_CHARSET_SIZE 6 /* max size of multi-byte character */
#define MAX_NAME_LENGTH 255 /* max len of file name excluding NULL */

21
fs/exfat/exfat_raw.h
View File

@ -27,6 +27,7 @@
((sbi)->num_clusters - EXFAT_RESERVED_CLUSTERS)
/* AllocationPossible and NoFatChain field in GeneralSecondaryFlags Field */
#define ALLOC_POSSIBLE 0x01
#define ALLOC_FAT_CHAIN 0x01
#define ALLOC_NO_FAT_CHAIN 0x03
@ -50,6 +51,8 @@
#define EXFAT_STREAM 0xC0 /* stream entry */
#define EXFAT_NAME 0xC1 /* file name entry */
#define EXFAT_ACL 0xC2 /* stream entry */
#define EXFAT_VENDOR_EXT 0xE0 /* vendor extension entry */
#define EXFAT_VENDOR_ALLOC 0xE1 /* vendor allocation entry */
#define IS_EXFAT_CRITICAL_PRI(x) (x < 0xA0)
#define IS_EXFAT_BENIGN_PRI(x) (x < 0xC0)
@ -155,6 +158,24 @@ struct exfat_dentry {
__le32 start_clu;
__le64 size;
} __packed upcase; /* up-case table directory entry */
struct {
__u8 flags;
__u8 vendor_guid[16];
__u8 vendor_defined[14];
} __packed vendor_ext; /* vendor extension directory entry */
struct {
__u8 flags;
__u8 vendor_guid[16];
__u8 vendor_defined[2];
__le32 start_clu;
__le64 size;
} __packed vendor_alloc; /* vendor allocation directory entry */
struct {
__u8 flags;
__u8 custom_defined[18];
__le32 start_clu;
__le64 size;
} __packed generic_secondary; /* generic secondary directory entry */
} __packed dentry;
} __packed;

26
fs/exfat/fatent.c
View File

@ -307,7 +307,7 @@ int exfat_alloc_cluster(struct inode *inode, unsigned int num_alloc,
struct exfat_chain *p_chain, bool sync_bmap)
{
int ret = -ENOSPC;
unsigned int num_clusters = 0, total_cnt;
unsigned int total_cnt;
unsigned int hint_clu, new_clu, last_clu = EXFAT_EOF_CLUSTER;
struct super_block *sb = inode->i_sb;
struct exfat_sb_info *sbi = EXFAT_SB(sb);
@ -344,18 +344,12 @@ int exfat_alloc_cluster(struct inode *inode, unsigned int num_alloc,
/* check cluster validation */
if (!is_valid_cluster(sbi, hint_clu)) {
exfat_err(sb, "hint_cluster is invalid (%u)",
if (hint_clu != sbi->num_clusters)
exfat_err(sb, "hint_cluster is invalid (%u), rewind to the first cluster",
hint_clu);
hint_clu = EXFAT_FIRST_CLUSTER;
if (p_chain->flags == ALLOC_NO_FAT_CHAIN) {
if (exfat_chain_cont_cluster(sb, p_chain->dir,
num_clusters)) {
ret = -EIO;
goto unlock;
}
p_chain->flags = ALLOC_FAT_CHAIN;
}
}
p_chain->dir = EXFAT_EOF_CLUSTER;
@ -364,7 +358,7 @@ int exfat_alloc_cluster(struct inode *inode, unsigned int num_alloc,
if (new_clu != hint_clu &&
p_chain->flags == ALLOC_NO_FAT_CHAIN) {
if (exfat_chain_cont_cluster(sb, p_chain->dir,
num_clusters)) {
p_chain->size)) {
ret = -EIO;
goto free_cluster;
}
@ -377,8 +371,6 @@ int exfat_alloc_cluster(struct inode *inode, unsigned int num_alloc,
goto free_cluster;
}
num_clusters++;
/* update FAT table */
if (p_chain->flags == ALLOC_FAT_CHAIN) {
if (exfat_ent_set(sb, new_clu, EXFAT_EOF_CLUSTER)) {
@ -395,13 +387,14 @@ int exfat_alloc_cluster(struct inode *inode, unsigned int num_alloc,
goto free_cluster;
}
}
p_chain->size++;
last_clu = new_clu;
if (--num_alloc == 0) {
if (p_chain->size == num_alloc) {
sbi->clu_srch_ptr = hint_clu;
sbi->used_clusters += num_clusters;
sbi->used_clusters += num_alloc;
p_chain->size += num_clusters;
mutex_unlock(&sbi->bitmap_lock);
return 0;
}
@ -412,7 +405,7 @@ int exfat_alloc_cluster(struct inode *inode, unsigned int num_alloc,
if (p_chain->flags == ALLOC_NO_FAT_CHAIN) {
if (exfat_chain_cont_cluster(sb, p_chain->dir,
num_clusters)) {
p_chain->size)) {
ret = -EIO;
goto free_cluster;
}
@ -421,7 +414,6 @@ int exfat_alloc_cluster(struct inode *inode, unsigned int num_alloc,
}
}
free_cluster:
if (num_clusters)
__exfat_free_cluster(inode, p_chain);
unlock:
mutex_unlock(&sbi->bitmap_lock);

3
fs/exfat/file.c
View File

@ -209,8 +209,7 @@ void exfat_truncate(struct inode *inode)
if (err)
goto write_size;
inode->i_blocks = round_up(i_size_read(inode), sbi->cluster_size) >>
inode->i_blkbits;
inode->i_blocks = round_up(i_size_read(inode), sbi->cluster_size) >> 9;
write_size:
aligned_size = i_size_read(inode);
if (aligned_size & (blocksize - 1)) {

6
fs/exfat/inode.c
View File

@ -220,8 +220,7 @@ static int exfat_map_cluster(struct inode *inode, unsigned int clu_offset,
num_clusters += num_to_be_allocated;
*clu = new_clu.dir;
inode->i_blocks +=
num_to_be_allocated << sbi->sect_per_clus_bits;
inode->i_blocks += EXFAT_CLU_TO_B(num_to_be_allocated, sbi) >> 9;
/*
* Move *clu pointer along FAT chains (hole care) because the
@ -576,8 +575,7 @@ static int exfat_fill_inode(struct inode *inode, struct exfat_dir_entry *info)
exfat_save_attr(inode, info->attr);
inode->i_blocks = round_up(i_size_read(inode), sbi->cluster_size) >>
inode->i_blkbits;
inode->i_blocks = round_up(i_size_read(inode), sbi->cluster_size) >> 9;
inode->i_mtime = info->mtime;
inode->i_ctime = info->mtime;
ei->i_crtime = info->crtime;

2
fs/exfat/namei.c
View File

@ -396,7 +396,7 @@ static int exfat_find_empty_entry(struct inode *inode,
ei->i_size_ondisk += sbi->cluster_size;
ei->i_size_aligned += sbi->cluster_size;
ei->flags = p_dir->flags;
inode->i_blocks += 1 << sbi->sect_per_clus_bits;
inode->i_blocks += sbi->cluster_size >> 9;
}
return dentry;

3
fs/exfat/super.c
View File

@ -373,8 +373,7 @@ static int exfat_read_root(struct inode *inode)
inode->i_op = &exfat_dir_inode_operations;
inode->i_fop = &exfat_dir_operations;
inode->i_blocks = round_up(i_size_read(inode), sbi->cluster_size) >>
inode->i_blkbits;
inode->i_blocks = round_up(i_size_read(inode), sbi->cluster_size) >> 9;
ei->i_pos = ((loff_t)sbi->root_dir << 32) | 0xffffffff;
ei->i_size_aligned = i_size_read(inode);
ei->i_size_ondisk = i_size_read(inode);