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

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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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4
fs/ext4/namei.c
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@@ -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));
}
/*