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| 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/ext4 | |
| parent | 002ced4be6429918800ce3e41d5cbc2d7c01822c (diff) | |
| download | linux-stable-ba63f23d69a3a10e7e527a02702023da68ef8a6d.tar.gz linux-stable-ba63f23d69a3a10e7e527a02702023da68ef8a6d.tar.bz2 linux-stable-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/ext4')
| -rw-r--r-- | fs/ext4/ioctl.c | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/fs/ext4/ioctl.c b/fs/ext4/ioctl.c index 10686fd67fb4..1bb7df5e4536 100644 --- a/fs/ext4/ioctl.c +++ b/fs/ext4/ioctl.c @@ -776,7 +776,7 @@ resizefs_out: (struct fscrypt_policy __user *)arg, sizeof(policy))) return -EFAULT; - return fscrypt_process_policy(inode, &policy); + return fscrypt_process_policy(filp, &policy); #else return -EOPNOTSUPP; #endif |