[linux.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 ([email protected])
 *
 * 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.
 */
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;
	long ret;

	if (_payload_iov == 0 || ioc == 0)
		goto no_payload;

	ret = compat_rw_copy_check_uvector(WRITE, _payload_iov, ioc,
					   ARRAY_SIZE(iovstack),
					   iovstack, &iov, 1);
	if (ret < 0)
		return ret;
	if (ret == 0)
		goto no_payload_free;

	ret = keyctl_instantiate_key_common(id, iov, ioc, ret, ringid);

	if (iov != iovstack)
		kfree(iov);
	return ret;

no_payload_free:
	if (iov != iovstack)
		kfree(iov);
no_payload:
	return keyctl_instantiate_key_common(id, NULL, 0, 0, ringid);
}

/*
 * 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.
 */
asmlinkage long compat_sys_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);

	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 ([email protected])
	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	*/
	27	long compat_keyctl_instantiate_key_iov(
	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;
	34	long ret;
	35
	36	if (_payload_iov == 0 \|\| ioc == 0)
	37	goto no_payload;
	38
	39	ret = compat_rw_copy_check_uvector(WRITE, _payload_iov, ioc,
	40	ARRAY_SIZE(iovstack),
fcf63409	41	iovstack, &iov, 1);
ee009e4a DH	42	if (ret < 0)
	43	return ret;
	44	if (ret == 0)
	45	goto no_payload_free;
	46
	47	ret = keyctl_instantiate_key_common(id, iov, ioc, ret, ringid);
	48
	49	if (iov != iovstack)
	50	kfree(iov);
	51	return ret;
	52
	53	no_payload_free:
	54	if (iov != iovstack)
	55	kfree(iov);
	56	no_payload:
	57	return keyctl_instantiate_key_common(id, NULL, 0, 0, ringid);
	58	}
	59
1da177e4	60	/*
973c9f4f DH	61	* The key control system call, 32-bit compatibility version for 64-bit archs
	62	*
	63	* This should only be called if the 64-bit arch uses weird pointers in 32-bit
	64	* mode or doesn't guarantee that the top 32-bits of the argument registers on
	65	* taking a 32-bit syscall are zero. If you can, you should call sys_keyctl()
	66	* directly.
1da177e4 LT	67	*/
1da177e4 LT	68	asmlinkage long compat_sys_keyctl(u32 option,
3e30148c	69	u32 arg2, u32 arg3, u32 arg4, u32 arg5)
1da177e4 LT	70	{
	71	switch (option) {
	72	case KEYCTL_GET_KEYRING_ID:
	73	return keyctl_get_keyring_ID(arg2, arg3);
	74
	75	case KEYCTL_JOIN_SESSION_KEYRING:
	76	return keyctl_join_session_keyring(compat_ptr(arg2));
	77
	78	case KEYCTL_UPDATE:
	79	return keyctl_update_key(arg2, compat_ptr(arg3), arg4);
	80
	81	case KEYCTL_REVOKE:
	82	return keyctl_revoke_key(arg2);
	83
	84	case KEYCTL_DESCRIBE:
	85	return keyctl_describe_key(arg2, compat_ptr(arg3), arg4);
	86
	87	case KEYCTL_CLEAR:
	88	return keyctl_keyring_clear(arg2);
	89
	90	case KEYCTL_LINK:
	91	return keyctl_keyring_link(arg2, arg3);
	92
	93	case KEYCTL_UNLINK:
	94	return keyctl_keyring_unlink(arg2, arg3);
	95
	96	case KEYCTL_SEARCH:
	97	return keyctl_keyring_search(arg2, compat_ptr(arg3),
	98	compat_ptr(arg4), arg5);
	99
	100	case KEYCTL_READ:
	101	return keyctl_read_key(arg2, compat_ptr(arg3), arg4);
	102
	103	case KEYCTL_CHOWN:
	104	return keyctl_chown_key(arg2, arg3, arg4);
	105
	106	case KEYCTL_SETPERM:
	107	return keyctl_setperm_key(arg2, arg3);
	108
	109	case KEYCTL_INSTANTIATE:
	110	return keyctl_instantiate_key(arg2, compat_ptr(arg3), arg4,
	111	arg5);
	112
	113	case KEYCTL_NEGATE:
	114	return keyctl_negate_key(arg2, arg3, arg4);
	115
3e30148c DH	116	case KEYCTL_SET_REQKEY_KEYRING:
	117	return keyctl_set_reqkey_keyring(arg2);
	118
017679c4 DH	119	case KEYCTL_SET_TIMEOUT:
	120	return keyctl_set_timeout(arg2, arg3);
	121
b5f545c8 DH	122	case KEYCTL_ASSUME_AUTHORITY:
	123	return keyctl_assume_authority(arg2);
	124
70a5bb72 DH	125	case KEYCTL_GET_SECURITY:
	126	return keyctl_get_security(arg2, compat_ptr(arg3), arg4);
	127
ee18d64c DH	128	case KEYCTL_SESSION_TO_PARENT:
	129	return keyctl_session_to_parent();
	130
fdd1b945 DH	131	case KEYCTL_REJECT:
	132	return keyctl_reject_key(arg2, arg3, arg4, arg5);
	133
ee009e4a DH	134	case KEYCTL_INSTANTIATE_IOV:
	135	return compat_keyctl_instantiate_key_iov(
	136	arg2, compat_ptr(arg3), arg4, arg5);
	137
1da177e4 LT	138	default:
	139	return -EOPNOTSUPP;
	140	}
a8b17ed0	141	}