From: Eric Biggers <ebiggers@xxxxxxxxxx>
commit ba63f23d69a3a10e7e527a02702023da68ef8a6d upstream. [Please apply
to 4.4-stable. Note: this was already backported, but only to ext4; it
was missed that it should go to f2fs as well. This is needed to make
xfstest generic/395 pass on f2fs.]
Since setting an encryption policy requires writing metadata to the
filesystem, it should be guarded by mnt_want_write/mnt_drop_write.
Otherwise, a user could cause a write to a frozen or readonly
filesystem. This was handled correctly by f2fs but not by ext4. Make
fscrypt_process_policy() handle it rather than relying on the filesystem
to get it right.
Signed-off-by: Eric Biggers <ebiggers@xxxxxxxxxx>
Cc: stable@xxxxxxxxxxxxxxx # 4.1+; check fs/{ext4,f2fs}
Signed-off-by: Theodore Ts'o <tytso@xxxxxxx>
Acked-by: Jaegeuk Kim <jaegeuk@xxxxxxxxxx>
---
fs/f2fs/file.c | 6 ++++++
1 file changed, 6 insertions(+)
diff --git a/fs/f2fs/file.c b/fs/f2fs/file.c
index 4b449d263333..01eed94b01ea 100644
--- a/fs/f2fs/file.c
+++ b/fs/f2fs/file.c
@@ -1541,12 +1541,18 @@ static int f2fs_ioc_set_encryption_policy(struct file *filp, unsigned long arg)
sizeof(policy)))
return -EFAULT;
+ err = mnt_want_write_file(filp);
+ if (err)
+ return err;
+
mutex_lock(&inode->i_mutex);
err = f2fs_process_policy(&policy, inode);
mutex_unlock(&inode->i_mutex);
+ mnt_drop_write_file(filp);
+
return err;
#else
return -EOPNOTSUPP;
--
2.15.0.rc0.271.g36b669edcc-goog