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f2fs crypto: check context consistent for rename2 

For exchange rename, we should check context consistent of encryption
between new_dir and old_inode or old_dir and new_inode. Otherwise
inheritance of parent's encryption context will be broken.

Signed-off-by: Chao Yu <chao2.yu@samsung.com>
[Jaegeuk Kim: sync with ext4 approach]
Signed-off-by: Jaegeuk Kim <jaegeuk@kernel.org>
This commit is contained in:
Chao Yu 2015-05-25 18:07:02 +08:00 committed by Jaegeuk Kim
parent 1237702471
commit d3baf7c472
1 changed files with 8 additions and 0 deletions
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8
fs/f2fs/namei.c
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@ -756,6 +756,14 @@ static int f2fs_cross_rename(struct inode *old_dir, struct dentry *old_dentry,
int old_nlink = 0, new_nlink = 0;
int err = -ENOENT;
if ((f2fs_encrypted_inode(old_dir) || f2fs_encrypted_inode(new_dir)) &&
(old_dir != new_dir) &&
(!f2fs_is_child_context_consistent_with_parent(new_dir,
old_inode) ||
!f2fs_is_child_context_consistent_with_parent(old_dir,
new_inode)))
return -EPERM;
f2fs_balance_fs(sbi);
old_entry = f2fs_find_entry(old_dir, &old_dentry->d_name, &old_page);