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ext4: add ext4_iget_normal() which is to be used for dir tree lookups 

If there is a corrupted file system which has directory entries that
point at reserved, metadata inodes, prohibit them from being used by
treating them the same way we treat Boot Loader inodes --- that is,
mark them to be bad inodes.  This prohibits them from being opened,
deleted, or modified via chmod, chown, utimes, etc.

In particular, this prevents a corrupted file system which has a
directory entry which points at the journal inode from being deleted
and its blocks released, after which point Much Hilarity Ensues.

Reported-by: Sami Liedes <sami.liedes@iki.fi>
Signed-off-by: Theodore Ts'o <tytso@mit.edu>
Cc: stable@vger.kernel.org
This commit is contained in:
Theodore Ts'o 2014-10-05 22:56:00 -04:00
parent e2bfb088fa
commit f4bb298102
4 changed files with 11 additions and 3 deletions
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1
fs/ext4/ext4.h
View File

@ -2109,6 +2109,7 @@ int do_journal_get_write_access(handle_t *handle,
#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);
extern int ext4_write_inode(struct inode *, struct writeback_control *);
extern int ext4_setattr(struct dentry *, struct iattr *);
extern int ext4_getattr(struct vfsmount *mnt, struct dentry *dentry,

7
fs/ext4/inode.c
View File

@ -4104,6 +4104,13 @@ struct inode *ext4_iget(struct super_block *sb, unsigned long ino)
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(-EIO);
return ext4_iget(sb, ino);
}
static int ext4_inode_blocks_set(handle_t *handle,
struct ext4_inode *raw_inode,
struct ext4_inode_info *ei)

4
fs/ext4/namei.c
View File

@ -1417,7 +1417,7 @@ static struct dentry *ext4_lookup(struct inode *dir, struct dentry *dentry, unsi
dentry);
return ERR_PTR(-EIO);
}
inode = ext4_iget(dir->i_sb, ino);
inode = ext4_iget_normal(dir->i_sb, ino);
if (inode == ERR_PTR(-ESTALE)) {
EXT4_ERROR_INODE(dir,
"deleted inode referenced: %u",
@ -1450,7 +1450,7 @@ struct dentry *ext4_get_parent(struct dentry *child)
return ERR_PTR(-EIO);
}
return d_obtain_alias(ext4_iget(child->d_inode->i_sb, ino));
return d_obtain_alias(ext4_iget_normal(child->d_inode->i_sb, ino));
}
/*

2
fs/ext4/super.c
View File

@ -1001,7 +1001,7 @@ static struct inode *ext4_nfs_get_inode(struct super_block *sb,
* Currently we don't know the generation for parent directory, so
* a generation of 0 means "accept any"
*/
inode = ext4_iget(sb, ino);
inode = ext4_iget_normal(sb, ino);
if (IS_ERR(inode))
return ERR_CAST(inode);
if (generation && inode->i_generation != generation) {