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ubifs: Enforce crypto policy in ->link and ->rename 

When a file is moved or linked into another directory
its current crypto policy has to be compatible with the
target policy.

Signed-off-by: Richard Weinberger <richard@nod.at>
This commit is contained in:
Richard Weinberger 2016-09-29 20:00:38 +02:00
parent a79bff21c1
commit ac7e47a9ed
1 changed files with 17 additions and 0 deletions
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17
fs/ubifs/dir.c
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@ -639,6 +639,10 @@ static int ubifs_link(struct dentry *old_dentry, struct inode *dir,
ubifs_assert(inode_is_locked(dir));
ubifs_assert(inode_is_locked(inode));
if (ubifs_crypt_is_encrypted(dir) &&
!fscrypt_has_permitted_context(dir, inode))
return -EPERM;
err = dbg_check_synced_i_size(c, inode);
if (err)
return err;
@ -1133,6 +1137,12 @@ static int do_rename(struct inode *old_dir, struct dentry *old_dentry,
if (unlink)
ubifs_assert(inode_is_locked(new_inode));
if (old_dir != new_dir) {
if (ubifs_crypt_is_encrypted(new_dir) &&
!fscrypt_has_permitted_context(new_dir, old_inode))
return -EPERM;
}
if (unlink && is_dir) {
err = ubifs_check_dir_empty(new_inode);
if (err)
@ -1327,6 +1337,13 @@ static int ubifs_xrename(struct inode *old_dir, struct dentry *old_dentry,
ubifs_assert(fst_inode && snd_inode);
if ((ubifs_crypt_is_encrypted(old_dir) ||
ubifs_crypt_is_encrypted(new_dir)) &&
(old_dir != new_dir) &&
(!fscrypt_has_permitted_context(new_dir, fst_inode) ||
!fscrypt_has_permitted_context(old_dir, snd_inode)))
return -EPERM;
lock_4_inodes(old_dir, new_dir, NULL, NULL);
time = ubifs_current_time(old_dir);