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ext4: wire up new fscrypt ioctls

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Wire up the new ioctls for adding and removing fscrypt keys to/from the
filesystem, and the new ioctl for retrieving v2 encryption policies.

The key removal ioctls also required making ext4_drop_inode() call
fscrypt_drop_inode().

For more details see Documentation/filesystems/fscrypt.rst and the
fscrypt patches that added the implementation of these ioctls.

Reviewed-by: Theodore Ts'o <tytso@mit.edu>
Signed-off-by: Eric Biggers <ebiggers@google.com>
This commit is contained in:
Eric Biggers 2019-08-04 19:35:48 -07:00
parent 5ab7189a31
commit 29b3692e6d
2 changed files with 33 additions and 0 deletions
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30
fs/ext4/ioctl.c
View File

@ -1115,6 +1115,31 @@ resizefs_out:
case EXT4_IOC_GET_ENCRYPTION_POLICY: case EXT4_IOC_GET_ENCRYPTION_POLICY:
return fscrypt_ioctl_get_policy(filp, (void __user *)arg); return fscrypt_ioctl_get_policy(filp, (void __user *)arg);
case FS_IOC_GET_ENCRYPTION_POLICY_EX:
if (!ext4_has_feature_encrypt(sb))
return -EOPNOTSUPP;
return fscrypt_ioctl_get_policy_ex(filp, (void __user *)arg);
case FS_IOC_ADD_ENCRYPTION_KEY:
if (!ext4_has_feature_encrypt(sb))
return -EOPNOTSUPP;
return fscrypt_ioctl_add_key(filp, (void __user *)arg);
case FS_IOC_REMOVE_ENCRYPTION_KEY:
if (!ext4_has_feature_encrypt(sb))
return -EOPNOTSUPP;
return fscrypt_ioctl_remove_key(filp, (void __user *)arg);
case FS_IOC_REMOVE_ENCRYPTION_KEY_ALL_USERS:
if (!ext4_has_feature_encrypt(sb))
return -EOPNOTSUPP;
return fscrypt_ioctl_remove_key_all_users(filp,
(void __user *)arg);
case FS_IOC_GET_ENCRYPTION_KEY_STATUS:
if (!ext4_has_feature_encrypt(sb))
return -EOPNOTSUPP;
return fscrypt_ioctl_get_key_status(filp, (void __user *)arg);
case EXT4_IOC_FSGETXATTR: case EXT4_IOC_FSGETXATTR:
{ {
struct fsxattr fa; struct fsxattr fa;
@ -1231,6 +1256,11 @@ long ext4_compat_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
case EXT4_IOC_SET_ENCRYPTION_POLICY: case EXT4_IOC_SET_ENCRYPTION_POLICY:
case EXT4_IOC_GET_ENCRYPTION_PWSALT: case EXT4_IOC_GET_ENCRYPTION_PWSALT:
case EXT4_IOC_GET_ENCRYPTION_POLICY: case EXT4_IOC_GET_ENCRYPTION_POLICY:
case FS_IOC_GET_ENCRYPTION_POLICY_EX:
case FS_IOC_ADD_ENCRYPTION_KEY:
case FS_IOC_REMOVE_ENCRYPTION_KEY:
case FS_IOC_REMOVE_ENCRYPTION_KEY_ALL_USERS:
case FS_IOC_GET_ENCRYPTION_KEY_STATUS:
case EXT4_IOC_SHUTDOWN: case EXT4_IOC_SHUTDOWN:
case FS_IOC_GETFSMAP: case FS_IOC_GETFSMAP:
break; break;

3
fs/ext4/super.c
View File

@ -1107,6 +1107,9 @@ static int ext4_drop_inode(struct inode *inode)
{ {
int drop = generic_drop_inode(inode); int drop = generic_drop_inode(inode);
if (!drop)
drop = fscrypt_drop_inode(inode);
trace_ext4_drop_inode(inode, drop); trace_ext4_drop_inode(inode, drop);
return drop; return drop;
} }