From f4bb2981024fc91b23b4d09a8817c415396dbabb Mon Sep 17 00:00:00 2001 From: Theodore Ts'o Date: Sun, 5 Oct 2014 22:56:00 -0400 Subject: 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 Signed-off-by: Theodore Ts'o Cc: stable@vger.kernel.org --- fs/ext4/inode.c | 7 +++++++ 1 file changed, 7 insertions(+) (limited to 'fs/ext4/inode.c') diff --git a/fs/ext4/inode.c b/fs/ext4/inode.c index 59983b28a93c..e204d8aabe7d 100644 --- a/fs/ext4/inode.c +++ b/fs/ext4/inode.c @@ -4104,6 +4104,13 @@ 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(-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) -- cgit v1.2.2