4.7-stable review patch. If anyone has any objections, please let me know.
------------------
From: Eric Biggers <ebigg...@google.com>
commit ba63f23d69a3a10e7e527a02702023da68ef8a6d upstream.
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 <ebigg...@google.com>
Signed-off-by: Theodore Ts'o <ty...@mit.edu>
Acked-by: Jaegeuk Kim <jaeg...@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gre...@linuxfoundation.org>
---
fs/ext4/ioctl.c | 6 ++++++
1 file changed, 6 insertions(+)
--- a/fs/ext4/ioctl.c
+++ b/fs/ext4/ioctl.c
@@ -782,7 +782,13 @@ resizefs_out:
goto encryption_policy_out;
}
+ err = mnt_want_write_file(filp);
+ if (err)
+ goto encryption_policy_out;
+
err = ext4_process_policy(&policy, inode);
+
+ mnt_drop_write_file(filp);
encryption_policy_out:
return err;
#else
