linux/security/keys/compat.c
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   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 */
  27static 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 || !ioc)
  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        case KEYCTL_INVALIDATE:
 139                return keyctl_invalidate_key(arg2);
 140
 141        default:
 142                return -EOPNOTSUPP;
 143        }
 144}
 145
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