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| author | Luis R. Rodriguez <mcgrof@kernel.org> | 2018-05-13 16:45:56 -0400 |
|---|---|---|
| committer | Theodore Ts'o <tytso@mit.edu> | 2018-05-13 16:45:56 -0400 |
| commit | 6390d33bf5d9b24fd4f96e415b6888f59c8494f9 (patch) | |
| tree | 41abc900ed27d46cb27466a562babf2a443af09e /fs/ext4 | |
| parent | 71fe989961374ae55863c5da527bcf45be020834 (diff) | |
| download | linux-6390d33bf5d9b24fd4f96e415b6888f59c8494f9.tar.gz linux-6390d33bf5d9b24fd4f96e415b6888f59c8494f9.tar.bz2 linux-6390d33bf5d9b24fd4f96e415b6888f59c8494f9.zip | |
ext4: add verifier check for symlink with append/immutable flags
The Linux VFS does not allow a way to set append/immuttable
attributes to symlinks, this is just not possible. If this is
detected inform the user as the filesystem must be corrupted.
Signed-off-by: Luis R. Rodriguez <mcgrof@kernel.org>
Signed-off-by: Theodore Ts'o <tytso@mit.edu>
Reviewed-by: Jan Kara <jack@suse.cz>
Diffstat (limited to 'fs/ext4')
| -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 0eb64e8f9602..9d512fa80d28 100644 --- a/fs/ext4/inode.c +++ b/fs/ext4/inode.c @@ -4965,6 +4965,13 @@ struct inode *ext4_iget(struct super_block *sb, unsigned long ino) inode->i_op = &ext4_dir_inode_operations; inode->i_fop = &ext4_dir_operations; } 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"); + ret = -EFSCORRUPTED; + goto bad_inode; + } if (ext4_encrypted_inode(inode)) { inode->i_op = &ext4_encrypted_symlink_inode_operations; ext4_set_aops(inode); |