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authorRichard Weinberger <richard@nod.at>2016-09-29 21:00:38 +0300
committerRichard Weinberger <richard@nod.at>2016-12-13 01:07:38 +0300
commitac7e47a9ed1b22b1c71345fcdec35a5d2727ef2c (patch)
treeffa8f90b4ce1941a5391905198ced19275502db4 /fs/ubifs
parenta79bff21c120a615dc8ba6df9258e9e2ef022e3b (diff)
downloadlinux-ac7e47a9ed1b22b1c71345fcdec35a5d2727ef2c.tar.xz
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>
Diffstat (limited to 'fs/ubifs')
-rw-r--r--fs/ubifs/dir.c17
1 files changed, 17 insertions, 0 deletions
diff --git a/fs/ubifs/dir.c b/fs/ubifs/dir.c
index 477817567971..bd0af4e9ca0b 100644
--- a/fs/ubifs/dir.c
+++ b/fs/ubifs/dir.c
@@ -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);