Root/security/keys/compat.c

Source at commit be977234bfb4a6dca8a39e7c52165e4cd536ad71 created 9 years 5 months ago.
By Lars-Peter Clausen, jz4740: Fix compile error
1/* 32-bit compatibility syscall for 64-bit systems
2 *
3 * Copyright (C) 2004-5 Red Hat, Inc. All Rights Reserved.
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
12#include <linux/syscalls.h>
13#include <linux/keyctl.h>
14#include <linux/compat.h>
15#include <linux/slab.h>
16#include "internal.h"
17
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 */
27long 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),
41                       iovstack, &iov);
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
53no_payload_free:
54    if (iov != iovstack)
55        kfree(iov);
56no_payload:
57    return keyctl_instantiate_key_common(id, NULL, 0, 0, ringid);
58}
59
60/*
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.
67 */
68asmlinkage long compat_sys_keyctl(u32 option,
69                  u32 arg2, u32 arg3, u32 arg4, u32 arg5)
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
116    case KEYCTL_SET_REQKEY_KEYRING:
117        return keyctl_set_reqkey_keyring(arg2);
118
119    case KEYCTL_SET_TIMEOUT:
120        return keyctl_set_timeout(arg2, arg3);
121
122    case KEYCTL_ASSUME_AUTHORITY:
123        return keyctl_assume_authority(arg2);
124
125    case KEYCTL_GET_SECURITY:
126        return keyctl_get_security(arg2, compat_ptr(arg3), arg4);
127
128    case KEYCTL_SESSION_TO_PARENT:
129        return keyctl_session_to_parent();
130
131    case KEYCTL_REJECT:
132        return keyctl_reject_key(arg2, arg3, arg4, arg5);
133
134    case KEYCTL_INSTANTIATE_IOV:
135        return compat_keyctl_instantiate_key_iov(
136            arg2, compat_ptr(arg3), arg4, arg5);
137
138    default:
139        return -EOPNOTSUPP;
140    }
141}
142

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