[linux-2.6-block.git] / security / keys / compat.c

/* 32-bit compatibility syscall for 64-bit systems
 *
 * Copyright (C) 2004-5 Red Hat, Inc. All Rights Reserved.
 * Written by David Howells (dhowells@redhat.com)
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License
 * as published by the Free Software Foundation; either version
 * 2 of the License, or (at your option) any later version.
 */

#include <linux/syscalls.h>
#include <linux/keyctl.h>
#include <linux/compat.h>
#include <linux/slab.h>
#include "internal.h"

/*
 * Instantiate a key with the specified compatibility multipart payload and
 * link the key into the destination keyring if one is given.
 *
 * The caller must have the appropriate instantiation permit set for this to
 * work (see keyctl_assume_authority).  No other permissions are required.
 *
 * If successful, 0 will be returned.
 */
static long compat_keyctl_instantiate_key_iov(
	key_serial_t id,
	const struct compat_iovec __user *_payload_iov,
	unsigned ioc,
	key_serial_t ringid)
{
	struct iovec iovstack[UIO_FASTIOV], *iov = iovstack;
	struct iov_iter from;
	long ret;

	if (!_payload_iov)
		ioc = 0;

	ret = compat_import_iovec(WRITE, _payload_iov, ioc,
				  ARRAY_SIZE(iovstack), &iov,
				  &from);
	if (ret < 0)
		return ret;

	ret = keyctl_instantiate_key_common(id, &from, ringid);
	kfree(iov);
	return ret;
}

/*
 * The key control system call, 32-bit compatibility version for 64-bit archs
 *
 * This should only be called if the 64-bit arch uses weird pointers in 32-bit
 * mode or doesn't guarantee that the top 32-bits of the argument registers on
 * taking a 32-bit syscall are zero.  If you can, you should call sys_keyctl()
 * directly.
 */
COMPAT_SYSCALL_DEFINE5(keyctl, u32, option,
		       u32, arg2, u32, arg3, u32, arg4, u32, arg5)
{
	switch (option) {
	case KEYCTL_GET_KEYRING_ID:
		return keyctl_get_keyring_ID(arg2, arg3);

	case KEYCTL_JOIN_SESSION_KEYRING:
		return keyctl_join_session_keyring(compat_ptr(arg2));

	case KEYCTL_UPDATE:
		return keyctl_update_key(arg2, compat_ptr(arg3), arg4);

	case KEYCTL_REVOKE:
		return keyctl_revoke_key(arg2);

	case KEYCTL_DESCRIBE:
		return keyctl_describe_key(arg2, compat_ptr(arg3), arg4);

	case KEYCTL_CLEAR:
		return keyctl_keyring_clear(arg2);

	case KEYCTL_LINK:
		return keyctl_keyring_link(arg2, arg3);

	case KEYCTL_UNLINK:
		return keyctl_keyring_unlink(arg2, arg3);

	case KEYCTL_SEARCH:
		return keyctl_keyring_search(arg2, compat_ptr(arg3),
					     compat_ptr(arg4), arg5);

	case KEYCTL_READ:
		return keyctl_read_key(arg2, compat_ptr(arg3), arg4);

	case KEYCTL_CHOWN:
		return keyctl_chown_key(arg2, arg3, arg4);

	case KEYCTL_SETPERM:
		return keyctl_setperm_key(arg2, arg3);

	case KEYCTL_INSTANTIATE:
		return keyctl_instantiate_key(arg2, compat_ptr(arg3), arg4,
					      arg5);

	case KEYCTL_NEGATE:
		return keyctl_negate_key(arg2, arg3, arg4);

	case KEYCTL_SET_REQKEY_KEYRING:
		return keyctl_set_reqkey_keyring(arg2);

	case KEYCTL_SET_TIMEOUT:
		return keyctl_set_timeout(arg2, arg3);

	case KEYCTL_ASSUME_AUTHORITY:
		return keyctl_assume_authority(arg2);

	case KEYCTL_GET_SECURITY:
		return keyctl_get_security(arg2, compat_ptr(arg3), arg4);

	case KEYCTL_SESSION_TO_PARENT:
		return keyctl_session_to_parent();

	case KEYCTL_REJECT:
		return keyctl_reject_key(arg2, arg3, arg4, arg5);

	case KEYCTL_INSTANTIATE_IOV:
		return compat_keyctl_instantiate_key_iov(
			arg2, compat_ptr(arg3), arg4, arg5);

	case KEYCTL_INVALIDATE:
		return keyctl_invalidate_key(arg2);

	case KEYCTL_GET_PERSISTENT:
		return keyctl_get_persistent(arg2, arg3);

	default:
		return -EOPNOTSUPP;
	}
}
Commit	Line	Data
973c9f4f	1	/* 32-bit compatibility syscall for 64-bit systems
1da177e4	2	*
3e30148c	3	* Copyright (C) 2004-5 Red Hat, Inc. All Rights Reserved.
1da177e4 LT	4	* Written by David Howells (dhowells@redhat.com)
	5	*
	6	* This program is free software; you can redistribute it and/or
	7	* modify it under the terms of the GNU General Public License
	8	* as published by the Free Software Foundation; either version
	9	* 2 of the License, or (at your option) any later version.
	10	*/
	11
1da177e4 LT	12	#include <linux/syscalls.h>
	13	#include <linux/keyctl.h>
	14	#include <linux/compat.h>
ee009e4a	15	#include <linux/slab.h>
1da177e4 LT	16	#include "internal.h"
1da177e4 LT	17
ee009e4a DH	18	/*
	19	* Instantiate a key with the specified compatibility multipart payload and
	20	* link the key into the destination keyring if one is given.
	21	*
	22	* The caller must have the appropriate instantiation permit set for this to
	23	* work (see keyctl_assume_authority). No other permissions are required.
	24	*
	25	* If successful, 0 will be returned.
	26	*/
423b9788	27	static long compat_keyctl_instantiate_key_iov(
ee009e4a DH	28	key_serial_t id,
	29	const struct compat_iovec __user *_payload_iov,
	30	unsigned ioc,
	31	key_serial_t ringid)
	32	{
	33	struct iovec iovstack[UIO_FASTIOV], *iov = iovstack;
b353a1f7	34	struct iov_iter from;
ee009e4a DH	35	long ret;
ee009e4a DH	36
b353a1f7 AV	37	if (!_payload_iov)
b353a1f7 AV	38	ioc = 0;
ee009e4a	39
b353a1f7 AV	40	ret = compat_import_iovec(WRITE, _payload_iov, ioc,
	41	ARRAY_SIZE(iovstack), &iov,
	42	&from);
ee009e4a	43	if (ret < 0)
b353a1f7	44	return ret;
ee009e4a	45
b353a1f7 AV	46	ret = keyctl_instantiate_key_common(id, &from, ringid);
b353a1f7 AV	47	kfree(iov);
ee009e4a	48	return ret;
ee009e4a DH	49	}
ee009e4a DH	50
1da177e4	51	/*
973c9f4f DH	52	* The key control system call, 32-bit compatibility version for 64-bit archs
	53	*
	54	* This should only be called if the 64-bit arch uses weird pointers in 32-bit
	55	* mode or doesn't guarantee that the top 32-bits of the argument registers on
	56	* taking a 32-bit syscall are zero. If you can, you should call sys_keyctl()
	57	* directly.
1da177e4	58	*/
875ec3da HC	59	COMPAT_SYSCALL_DEFINE5(keyctl, u32, option,
875ec3da HC	60	u32, arg2, u32, arg3, u32, arg4, u32, arg5)
1da177e4 LT	61	{
	62	switch (option) {
	63	case KEYCTL_GET_KEYRING_ID:
	64	return keyctl_get_keyring_ID(arg2, arg3);
	65
	66	case KEYCTL_JOIN_SESSION_KEYRING:
	67	return keyctl_join_session_keyring(compat_ptr(arg2));
	68
	69	case KEYCTL_UPDATE:
	70	return keyctl_update_key(arg2, compat_ptr(arg3), arg4);
	71
	72	case KEYCTL_REVOKE:
	73	return keyctl_revoke_key(arg2);
	74
	75	case KEYCTL_DESCRIBE:
	76	return keyctl_describe_key(arg2, compat_ptr(arg3), arg4);
	77
	78	case KEYCTL_CLEAR:
	79	return keyctl_keyring_clear(arg2);
	80
	81	case KEYCTL_LINK:
	82	return keyctl_keyring_link(arg2, arg3);
	83
	84	case KEYCTL_UNLINK:
	85	return keyctl_keyring_unlink(arg2, arg3);
	86
	87	case KEYCTL_SEARCH:
	88	return keyctl_keyring_search(arg2, compat_ptr(arg3),
	89	compat_ptr(arg4), arg5);
	90
	91	case KEYCTL_READ:
	92	return keyctl_read_key(arg2, compat_ptr(arg3), arg4);
	93
	94	case KEYCTL_CHOWN:
	95	return keyctl_chown_key(arg2, arg3, arg4);
	96
	97	case KEYCTL_SETPERM:
	98	return keyctl_setperm_key(arg2, arg3);
	99
	100	case KEYCTL_INSTANTIATE:
	101	return keyctl_instantiate_key(arg2, compat_ptr(arg3), arg4,
	102	arg5);
	103
	104	case KEYCTL_NEGATE:
	105	return keyctl_negate_key(arg2, arg3, arg4);
	106
3e30148c DH	107	case KEYCTL_SET_REQKEY_KEYRING:
	108	return keyctl_set_reqkey_keyring(arg2);
	109
017679c4 DH	110	case KEYCTL_SET_TIMEOUT:
	111	return keyctl_set_timeout(arg2, arg3);
	112
b5f545c8 DH	113	case KEYCTL_ASSUME_AUTHORITY:
	114	return keyctl_assume_authority(arg2);
	115
70a5bb72 DH	116	case KEYCTL_GET_SECURITY:
	117	return keyctl_get_security(arg2, compat_ptr(arg3), arg4);
	118
ee18d64c DH	119	case KEYCTL_SESSION_TO_PARENT:
	120	return keyctl_session_to_parent();
	121
fdd1b945 DH	122	case KEYCTL_REJECT:
	123	return keyctl_reject_key(arg2, arg3, arg4, arg5);
	124
ee009e4a DH	125	case KEYCTL_INSTANTIATE_IOV:
	126	return compat_keyctl_instantiate_key_iov(
	127	arg2, compat_ptr(arg3), arg4, arg5);
	128
fd75815f DH	129	case KEYCTL_INVALIDATE:
	130	return keyctl_invalidate_key(arg2);
	131
f36f8c75 DH	132	case KEYCTL_GET_PERSISTENT:
	133	return keyctl_get_persistent(arg2, arg3);
	134
1da177e4 LT	135	default:
	136	return -EOPNOTSUPP;
	137	}
a8b17ed0	138	}