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| author | Theodore Ts'o <tytso@mit.edu> | 2014-10-06 06:56:00 +0400 |
|---|---|---|
| committer | Zefan Li <lizefan@huawei.com> | 2015-02-02 12:04:53 +0300 |
| commit | 07cf4db32b426b6b9d649cac784a4b199001fbd1 (patch) | |
| tree | 3cb4711ecbc0c33f82bc32dcc424cfc61e162cdc /fs/ext4/inode.c | |
| parent | 07048f9e15e456be7d216e6f4515c33cafc6fc2b (diff) | |
| download | linux-07cf4db32b426b6b9d649cac784a4b199001fbd1.tar.xz | |
ext4: add ext4_iget_normal() which is to be used for dir tree lookups
commit f4bb2981024fc91b23b4d09a8817c415396dbabb upstream.
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>
Signed-off-by: Zefan Li <lizefan@huawei.com>
Diffstat (limited to 'fs/ext4/inode.c')
| -rw-r--r-- | fs/ext4/inode.c | 7 |
1 files changed, 7 insertions, 0 deletions
diff --git a/fs/ext4/inode.c b/fs/ext4/inode.c index b9c3995269de..c3598f185968 100644 --- a/fs/ext4/inode.c +++ b/fs/ext4/inode.c @@ -3838,6 +3838,13 @@ 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) |