diff options
| author | Eric Biggers <ebiggers@google.com> | 2016-10-15 09:48:50 -0400 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2017-03-22 12:04:18 +0100 |
| commit | 3a19419c50c6ee386ca6d22a23acc2df51583d3d (patch) | |
| tree | 983c5f1b10421ac655ef15533c4efa38f05397ef /fs/f2fs/file.c | |
| parent | fd74e8d258da9f9678da6bf88a0b02b2c1b71d0c (diff) | |
fscrypto: lock inode while setting encryption policy
commit 8906a8223ad4909b391c5628f7991ebceda30e52 upstream.
i_rwsem needs to be acquired while setting an encryption policy so that
concurrent calls to FS_IOC_SET_ENCRYPTION_POLICY are correctly
serialized (especially the ->get_context() + ->set_context() pair), and
so that new files cannot be created in the directory during or after the
->empty_dir() check.
Signed-off-by: Eric Biggers <ebiggers@google.com>
Signed-off-by: Theodore Ts'o <tytso@mit.edu>
Reviewed-by: Richard Weinberger <richard@nod.at>
Cc: stable@vger.kernel.org
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'fs/f2fs/file.c')
| -rw-r--r-- | fs/f2fs/file.c | 9 |
1 files changed, 8 insertions, 1 deletions
diff --git a/fs/f2fs/file.c b/fs/f2fs/file.c index a197215ad52b..4b449d263333 100644 --- a/fs/f2fs/file.c +++ b/fs/f2fs/file.c @@ -1535,12 +1535,19 @@ static int f2fs_ioc_set_encryption_policy(struct file *filp, unsigned long arg) #ifdef CONFIG_F2FS_FS_ENCRYPTION struct f2fs_encryption_policy policy; struct inode *inode = file_inode(filp); + int err; if (copy_from_user(&policy, (struct f2fs_encryption_policy __user *)arg, sizeof(policy))) return -EFAULT; - return f2fs_process_policy(&policy, inode); + mutex_lock(&inode->i_mutex); + + err = f2fs_process_policy(&policy, inode); + + mutex_unlock(&inode->i_mutex); + + return err; #else return -EOPNOTSUPP; #endif |