diff options
| author |   Eric Biggers <ebiggers@google.com> | 2016-09-08 14:20:38 -0700 |
|---|---|---|
| committer |   Theodore Ts'o <tytso@mit.edu> | 2016-09-10 01:18:57 -0400 |
| commit | ba63f23d69a3a10e7e527a02702023da68ef8a6d (patch) | |
| tree | ef70ece0179f4d642e0b0b4d5f6aa6cfed7c9e74 /fs/f2fs/file.c | |
| parent | fscrypto: only allow setting encryption policy on directories (diff) | |
| download | linux-dev-ba63f23d69a3a10e7e527a02702023da68ef8a6d.tar.xz linux-dev-ba63f23d69a3a10e7e527a02702023da68ef8a6d.zip | |
fscrypto: require write access to mount to set encryption policy
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@google.com>
Cc: stable@vger.kernel.org # 4.1+; check fs/{ext4,f2fs}
Signed-off-by: Theodore Ts'o <tytso@mit.edu>
Acked-by: Jaegeuk Kim <jaegeuk@kernel.org>
Diffstat (limited to 'fs/f2fs/file.c')
| -rw-r--r-- | fs/f2fs/file.c | 9 |
1 files changed, 1 insertions, 8 deletions
diff --git a/fs/f2fs/file.c b/fs/f2fs/file.c index 47abb96098e4..28f4f4cbb8d8 100644 --- a/fs/f2fs/file.c +++ b/fs/f2fs/file.c @@ -1757,21 +1757,14 @@ static int f2fs_ioc_set_encryption_policy(struct file *filp, unsigned long arg) { struct fscrypt_policy policy; struct inode *inode = file_inode(filp); - int ret; if (copy_from_user(&policy, (struct fscrypt_policy __user *)arg, sizeof(policy))) return -EFAULT; - ret = mnt_want_write_file(filp); - if (ret) - return ret; - f2fs_update_time(F2FS_I_SB(inode), REQ_TIME); - ret = fscrypt_process_policy(inode, &policy); - mnt_drop_write_file(filp); - return ret; + return fscrypt_process_policy(filp, &policy); } static int f2fs_ioc_get_encryption_policy(struct file *filp, unsigned long arg) |