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-rw-r--r--fs/ext4/ext4.h15
-rw-r--r--fs/ext4/ialloc.c2
-rw-r--r--fs/ext4/inode.c54
-rw-r--r--fs/ext4/ioctl.c2
-rw-r--r--fs/ext4/namei.c4
-rw-r--r--fs/ext4/resize.c5
-rw-r--r--fs/ext4/super.c19
-rw-r--r--fs/ext4/xattr.c5
8 files changed, 65 insertions, 41 deletions
diff --git a/fs/ext4/ext4.h b/fs/ext4/ext4.h
index b4621277e259..185a05d3257e 100644
--- a/fs/ext4/ext4.h
+++ b/fs/ext4/ext4.h
@@ -2454,8 +2454,19 @@ int do_journal_get_write_access(handle_t *handle,
#define FALL_BACK_TO_NONDELALLOC 1
#define CONVERT_INLINE_DATA 2
-extern struct inode *ext4_iget(struct super_block *, unsigned long);
-extern struct inode *ext4_iget_normal(struct super_block *, unsigned long);
+typedef enum {
+ EXT4_IGET_NORMAL = 0,
+ EXT4_IGET_SPECIAL = 0x0001, /* OK to iget a system inode */
+ EXT4_IGET_HANDLE = 0x0002 /* Inode # is from a handle */
+} ext4_iget_flags;
+
+extern struct inode *__ext4_iget(struct super_block *sb, unsigned long ino,
+ ext4_iget_flags flags, const char *function,
+ unsigned int line);
+
+#define ext4_iget(sb, ino, flags) \
+ __ext4_iget((sb), (ino), (flags), __func__, __LINE__)
+
extern int ext4_write_inode(struct inode *, struct writeback_control *);
extern int ext4_setattr(struct dentry *, struct iattr *);
extern int ext4_getattr(const struct path *, struct kstat *, u32, unsigned int);
diff --git a/fs/ext4/ialloc.c b/fs/ext4/ialloc.c
index 014f6a698cb7..7ff14a1adba3 100644
--- a/fs/ext4/ialloc.c
+++ b/fs/ext4/ialloc.c
@@ -1225,7 +1225,7 @@ struct inode *ext4_orphan_get(struct super_block *sb, unsigned long ino)
if (!ext4_test_bit(bit, bitmap_bh->b_data))
goto bad_orphan;
- inode = ext4_iget(sb, ino);
+ inode = ext4_iget(sb, ino, EXT4_IGET_NORMAL);
if (IS_ERR(inode)) {
err = PTR_ERR(inode);
ext4_error(sb, "couldn't read orphan inode %lu (err %d)",
diff --git a/fs/ext4/inode.c b/fs/ext4/inode.c
index 22a9d8159720..664b434ba836 100644
--- a/fs/ext4/inode.c
+++ b/fs/ext4/inode.c
@@ -4817,7 +4817,9 @@ static inline u64 ext4_inode_peek_iversion(const struct inode *inode)
return inode_peek_iversion(inode);
}
-struct inode *ext4_iget(struct super_block *sb, unsigned long ino)
+struct inode *__ext4_iget(struct super_block *sb, unsigned long ino,
+ ext4_iget_flags flags, const char *function,
+ unsigned int line)
{
struct ext4_iloc iloc;
struct ext4_inode *raw_inode;
@@ -4831,6 +4833,18 @@ struct inode *ext4_iget(struct super_block *sb, unsigned long ino)
gid_t i_gid;
projid_t i_projid;
+ if (((flags & EXT4_IGET_NORMAL) &&
+ (ino < EXT4_FIRST_INO(sb) && ino != EXT4_ROOT_INO)) ||
+ (ino < EXT4_ROOT_INO) ||
+ (ino > le32_to_cpu(EXT4_SB(sb)->s_es->s_inodes_count))) {
+ if (flags & EXT4_IGET_HANDLE)
+ return ERR_PTR(-ESTALE);
+ __ext4_error(sb, function, line,
+ "inode #%lu: comm %s: iget: illegal inode #",
+ ino, current->comm);
+ return ERR_PTR(-EFSCORRUPTED);
+ }
+
inode = iget_locked(sb, ino);
if (!inode)
return ERR_PTR(-ENOMEM);
@@ -4846,18 +4860,26 @@ struct inode *ext4_iget(struct super_block *sb, unsigned long ino)
raw_inode = ext4_raw_inode(&iloc);
if ((ino == EXT4_ROOT_INO) && (raw_inode->i_links_count == 0)) {
- EXT4_ERROR_INODE(inode, "root inode unallocated");
+ ext4_error_inode(inode, function, line, 0,
+ "iget: root inode unallocated");
ret = -EFSCORRUPTED;
goto bad_inode;
}
+ if ((flags & EXT4_IGET_HANDLE) &&
+ (raw_inode->i_links_count == 0) && (raw_inode->i_mode == 0)) {
+ ret = -ESTALE;
+ goto bad_inode;
+ }
+
if (EXT4_INODE_SIZE(inode->i_sb) > EXT4_GOOD_OLD_INODE_SIZE) {
ei->i_extra_isize = le16_to_cpu(raw_inode->i_extra_isize);
if (EXT4_GOOD_OLD_INODE_SIZE + ei->i_extra_isize >
EXT4_INODE_SIZE(inode->i_sb) ||
(ei->i_extra_isize & 3)) {
- EXT4_ERROR_INODE(inode,
- "bad extra_isize %u (inode size %u)",
+ ext4_error_inode(inode, function, line, 0,
+ "iget: bad extra_isize %u "
+ "(inode size %u)",
ei->i_extra_isize,
EXT4_INODE_SIZE(inode->i_sb));
ret = -EFSCORRUPTED;
@@ -4879,7 +4901,8 @@ struct inode *ext4_iget(struct super_block *sb, unsigned long ino)
}
if (!ext4_inode_csum_verify(inode, raw_inode, ei)) {
- EXT4_ERROR_INODE(inode, "checksum invalid");
+ ext4_error_inode(inode, function, line, 0,
+ "iget: checksum invalid");
ret = -EFSBADCRC;
goto bad_inode;
}
@@ -4936,7 +4959,8 @@ struct inode *ext4_iget(struct super_block *sb, unsigned long ino)
((__u64)le16_to_cpu(raw_inode->i_file_acl_high)) << 32;
inode->i_size = ext4_isize(sb, raw_inode);
if ((size = i_size_read(inode)) < 0) {
- EXT4_ERROR_INODE(inode, "bad i_size value: %lld", size);
+ ext4_error_inode(inode, function, line, 0,
+ "iget: bad i_size value: %lld", size);
ret = -EFSCORRUPTED;
goto bad_inode;
}
@@ -5012,7 +5036,8 @@ struct inode *ext4_iget(struct super_block *sb, unsigned long ino)
ret = 0;
if (ei->i_file_acl &&
!ext4_data_block_valid(EXT4_SB(sb), ei->i_file_acl, 1)) {
- EXT4_ERROR_INODE(inode, "bad extended attribute block %llu",
+ ext4_error_inode(inode, function, line, 0,
+ "iget: bad extended attribute block %llu",
ei->i_file_acl);
ret = -EFSCORRUPTED;
goto bad_inode;
@@ -5040,8 +5065,9 @@ struct inode *ext4_iget(struct super_block *sb, unsigned long ino)
} else if (S_ISLNK(inode->i_mode)) {
/* VFS does not allow setting these so must be corruption */
if (IS_APPEND(inode) || IS_IMMUTABLE(inode)) {
- EXT4_ERROR_INODE(inode,
- "immutable or append flags not allowed on symlinks");
+ ext4_error_inode(inode, function, line, 0,
+ "iget: immutable or append flags "
+ "not allowed on symlinks");
ret = -EFSCORRUPTED;
goto bad_inode;
}
@@ -5071,7 +5097,8 @@ struct inode *ext4_iget(struct super_block *sb, unsigned long ino)
make_bad_inode(inode);
} else {
ret = -EFSCORRUPTED;
- EXT4_ERROR_INODE(inode, "bogus i_mode (%o)", inode->i_mode);
+ ext4_error_inode(inode, function, line, 0,
+ "iget: bogus i_mode (%o)", inode->i_mode);
goto bad_inode;
}
brelse(iloc.bh);
@@ -5085,13 +5112,6 @@ bad_inode:
return ERR_PTR(ret);
}
-struct inode *ext4_iget_normal(struct super_block *sb, unsigned long ino)
-{
- if (ino < EXT4_FIRST_INO(sb) && ino != EXT4_ROOT_INO)
- return ERR_PTR(-EFSCORRUPTED);
- return ext4_iget(sb, ino);
-}
-
static int ext4_inode_blocks_set(handle_t *handle,
struct ext4_inode *raw_inode,
struct ext4_inode_info *ei)
diff --git a/fs/ext4/ioctl.c b/fs/ext4/ioctl.c
index 0edee31913d1..d37dafa1d133 100644
--- a/fs/ext4/ioctl.c
+++ b/fs/ext4/ioctl.c
@@ -125,7 +125,7 @@ static long swap_inode_boot_loader(struct super_block *sb,
!inode_owner_or_capable(inode) || !capable(CAP_SYS_ADMIN))
return -EPERM;
- inode_bl = ext4_iget(sb, EXT4_BOOT_LOADER_INO);
+ inode_bl = ext4_iget(sb, EXT4_BOOT_LOADER_INO, EXT4_IGET_SPECIAL);
if (IS_ERR(inode_bl))
return PTR_ERR(inode_bl);
ei_bl = EXT4_I(inode_bl);
diff --git a/fs/ext4/namei.c b/fs/ext4/namei.c
index 437f71fe83ae..2b928eb07fa2 100644
--- a/fs/ext4/namei.c
+++ b/fs/ext4/namei.c
@@ -1571,7 +1571,7 @@ static struct dentry *ext4_lookup(struct inode *dir, struct dentry *dentry, unsi
dentry);
return ERR_PTR(-EFSCORRUPTED);
}
- inode = ext4_iget_normal(dir->i_sb, ino);
+ inode = ext4_iget(dir->i_sb, ino, EXT4_IGET_NORMAL);
if (inode == ERR_PTR(-ESTALE)) {
EXT4_ERROR_INODE(dir,
"deleted inode referenced: %u",
@@ -1613,7 +1613,7 @@ struct dentry *ext4_get_parent(struct dentry *child)
return ERR_PTR(-EFSCORRUPTED);
}
- return d_obtain_alias(ext4_iget_normal(child->d_sb, ino));
+ return d_obtain_alias(ext4_iget(child->d_sb, ino, EXT4_IGET_NORMAL));
}
/*
diff --git a/fs/ext4/resize.c b/fs/ext4/resize.c
index bc8ee0c498cc..48421de803b7 100644
--- a/fs/ext4/resize.c
+++ b/fs/ext4/resize.c
@@ -1637,7 +1637,7 @@ int ext4_group_add(struct super_block *sb, struct ext4_new_group_data *input)
"No reserved GDT blocks, can't resize");
return -EPERM;
}
- inode = ext4_iget(sb, EXT4_RESIZE_INO);
+ inode = ext4_iget(sb, EXT4_RESIZE_INO, EXT4_IGET_SPECIAL);
if (IS_ERR(inode)) {
ext4_warning(sb, "Error opening resize inode");
return PTR_ERR(inode);
@@ -1965,7 +1965,8 @@ retry:
}
if (!resize_inode)
- resize_inode = ext4_iget(sb, EXT4_RESIZE_INO);
+ resize_inode = ext4_iget(sb, EXT4_RESIZE_INO,
+ EXT4_IGET_SPECIAL);
if (IS_ERR(resize_inode)) {
ext4_warning(sb, "Error opening resize inode");
return PTR_ERR(resize_inode);
diff --git a/fs/ext4/super.c b/fs/ext4/super.c
index e862b82066ab..fc9071081600 100644
--- a/fs/ext4/super.c
+++ b/fs/ext4/super.c
@@ -1173,20 +1173,11 @@ static struct inode *ext4_nfs_get_inode(struct super_block *sb,
{
struct inode *inode;
- if (ino < EXT4_FIRST_INO(sb) && ino != EXT4_ROOT_INO)
- return ERR_PTR(-ESTALE);
- if (ino > le32_to_cpu(EXT4_SB(sb)->s_es->s_inodes_count))
- return ERR_PTR(-ESTALE);
-
- /* iget isn't really right if the inode is currently unallocated!!
- *
- * ext4_read_inode will return a bad_inode if the inode had been
- * deleted, so we should be safe.
- *
+ /*
* Currently we don't know the generation for parent directory, so
* a generation of 0 means "accept any"
*/
- inode = ext4_iget_normal(sb, ino);
+ inode = ext4_iget(sb, ino, EXT4_IGET_HANDLE);
if (IS_ERR(inode))
return ERR_CAST(inode);
if (generation && inode->i_generation != generation) {
@@ -4350,7 +4341,7 @@ no_journal:
* so we can safely mount the rest of the filesystem now.
*/
- root = ext4_iget(sb, EXT4_ROOT_INO);
+ root = ext4_iget(sb, EXT4_ROOT_INO, EXT4_IGET_SPECIAL);
if (IS_ERR(root)) {
ext4_msg(sb, KERN_ERR, "get root inode failed");
ret = PTR_ERR(root);
@@ -4618,7 +4609,7 @@ static struct inode *ext4_get_journal_inode(struct super_block *sb,
* happen if we iget() an unused inode, as the subsequent iput()
* will try to delete it.
*/
- journal_inode = ext4_iget(sb, journal_inum);
+ journal_inode = ext4_iget(sb, journal_inum, EXT4_IGET_SPECIAL);
if (IS_ERR(journal_inode)) {
ext4_msg(sb, KERN_ERR, "no journal found");
return NULL;
@@ -5700,7 +5691,7 @@ static int ext4_quota_enable(struct super_block *sb, int type, int format_id,
if (!qf_inums[type])
return -EPERM;
- qf_inode = ext4_iget(sb, qf_inums[type]);
+ qf_inode = ext4_iget(sb, qf_inums[type], EXT4_IGET_SPECIAL);
if (IS_ERR(qf_inode)) {
ext4_error(sb, "Bad quota inode # %lu", qf_inums[type]);
return PTR_ERR(qf_inode);
diff --git a/fs/ext4/xattr.c b/fs/ext4/xattr.c
index 91037890a90b..86ed9c686249 100644
--- a/fs/ext4/xattr.c
+++ b/fs/ext4/xattr.c
@@ -384,7 +384,7 @@ static int ext4_xattr_inode_iget(struct inode *parent, unsigned long ea_ino,
struct inode *inode;
int err;
- inode = ext4_iget(parent->i_sb, ea_ino);
+ inode = ext4_iget(parent->i_sb, ea_ino, EXT4_IGET_NORMAL);
if (IS_ERR(inode)) {
err = PTR_ERR(inode);
ext4_error(parent->i_sb,
@@ -1482,7 +1482,8 @@ ext4_xattr_inode_cache_find(struct inode *inode, const void *value,
}
while (ce) {
- ea_inode = ext4_iget(inode->i_sb, ce->e_value);
+ ea_inode = ext4_iget(inode->i_sb, ce->e_value,
+ EXT4_IGET_NORMAL);
if (!IS_ERR(ea_inode) &&
!is_bad_inode(ea_inode) &&
(EXT4_I(ea_inode)->i_flags & EXT4_EA_INODE_FL) &&
Copyright © 1996 – 2023 Jason A. Donenfeld. All Rights Reverse Engineered.