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ext4: disable pwsalt ioctl when encryption disabled by config 

On a CONFIG_EXT4_FS_ENCRYPTION=n kernel, the ioctls to get and set
encryption policies were disabled but EXT4_IOC_GET_ENCRYPTION_PWSALT was
not.  But there's no good reason to expose the pwsalt ioctl if the
kernel doesn't support encryption.  The pwsalt ioctl was also disabled
pre-4.8 (via ext4_sb_has_crypto() previously returning 0 when encryption
was disabled by config) and seems to have been enabled by mistake when
ext4 encryption was refactored to use fs/crypto/.  So let's disable it
again.

Signed-off-by: Eric Biggers <ebiggers@google.com>
Signed-off-by: Theodore Ts'o <tytso@mit.edu>
This commit is contained in:
Eric Biggers 2016-12-01 11:55:51 -05:00 committed by Theodore Ts'o
parent 35997d1ce8
commit ba679017ef
1 changed files with 6 additions and 0 deletions
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6
fs/ext4/ioctl.c
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@ -191,6 +191,7 @@ static long swap_inode_boot_loader(struct super_block *sb,
return err;
}
#ifdef CONFIG_EXT4_FS_ENCRYPTION
static int uuid_is_zero(__u8 u[16])
{
int i;
@ -200,6 +201,7 @@ static int uuid_is_zero(__u8 u[16])
return 0;
return 1;
}
#endif
static int ext4_ioctl_setflags(struct inode *inode,
unsigned int flags)
@ -802,6 +804,7 @@ long ext4_ioctl(struct file *filp, unsigned int cmd, unsigned long arg)
#endif
}
case EXT4_IOC_GET_ENCRYPTION_PWSALT: {
#ifdef CONFIG_EXT4_FS_ENCRYPTION
int err, err2;
struct ext4_sb_info *sbi = EXT4_SB(sb);
handle_t *handle;
@ -836,6 +839,9 @@ long ext4_ioctl(struct file *filp, unsigned int cmd, unsigned long arg)
sbi->s_es->s_encrypt_pw_salt, 16))
return -EFAULT;
return 0;
#else
return -EOPNOTSUPP;
#endif
}
case EXT4_IOC_GET_ENCRYPTION_POLICY: {
#ifdef CONFIG_EXT4_FS_ENCRYPTION