security/keys/compat.c

   1 // SPDX-License-Identifier: GPL-2.0-or-later
   2 /* 32-bit compatibility syscall for 64-bit systems
   3  *
   4  * Copyright (C) 2004-5 Red Hat, Inc. All Rights Reserved.
   5  * Written by David Howells (dhowells@redhat.com)
   6  */
   7
   8 #include <linux/syscalls.h>
   9 #include <linux/keyctl.h>
  10 #include <linux/compat.h>
  11 #include <linux/slab.h>
  12 #include "internal.h"
  13
  14 /*
  15  * Instantiate a key with the specified compatibility multipart payload and
  16  * link the key into the destination keyring if one is given.
  17  *
  18  * The caller must have the appropriate instantiation permit set for this to
  19  * work (see keyctl_assume_authority).  No other permissions are required.
  20  *
  21  * If successful, 0 will be returned.
  22  */
  23 static long compat_keyctl_instantiate_key_iov(
  24         key_serial_t id,
  25         const struct compat_iovec __user *_payload_iov,
  26         unsigned ioc,
  27         key_serial_t ringid)
  28 {
  29         struct iovec iovstack[UIO_FASTIOV], *iov = iovstack;
  30         struct iov_iter from;
  31         long ret;
  32
  33         if (!_payload_iov)
  34                 ioc = 0;
  35
  36         ret = compat_import_iovec(WRITE, _payload_iov, ioc,
  37                                   ARRAY_SIZE(iovstack), &iov,
  38                                   &from);
  39         if (ret < 0)
  40                 return ret;
  41
  42         ret = keyctl_instantiate_key_common(id, &from, ringid);
  43         kfree(iov);
  44         return ret;
  45 }
  46
  47 /*
  48  * The key control system call, 32-bit compatibility version for 64-bit archs
  49  */
  50 COMPAT_SYSCALL_DEFINE5(keyctl, u32, option,
  51                        u32, arg2, u32, arg3, u32, arg4, u32, arg5)
  52 {
  53         switch (option) {
  54         case KEYCTL_GET_KEYRING_ID:
  55                 return keyctl_get_keyring_ID(arg2, arg3);
  56
  57         case KEYCTL_JOIN_SESSION_KEYRING:
  58                 return keyctl_join_session_keyring(compat_ptr(arg2));
  59
  60         case KEYCTL_UPDATE:
  61                 return keyctl_update_key(arg2, compat_ptr(arg3), arg4);
  62
  63         case KEYCTL_REVOKE:
  64                 return keyctl_revoke_key(arg2);
  65
  66         case KEYCTL_DESCRIBE:
  67                 return keyctl_describe_key(arg2, compat_ptr(arg3), arg4);
  68
  69         case KEYCTL_CLEAR:
  70                 return keyctl_keyring_clear(arg2);
  71
  72         case KEYCTL_LINK:
  73                 return keyctl_keyring_link(arg2, arg3);
  74
  75         case KEYCTL_UNLINK:
  76                 return keyctl_keyring_unlink(arg2, arg3);
  77
  78         case KEYCTL_SEARCH:
  79                 return keyctl_keyring_search(arg2, compat_ptr(arg3),
  80                                              compat_ptr(arg4), arg5);
  81
  82         case KEYCTL_READ:
  83                 return keyctl_read_key(arg2, compat_ptr(arg3), arg4);
  84
  85         case KEYCTL_CHOWN:
  86                 return keyctl_chown_key(arg2, arg3, arg4);
  87
  88         case KEYCTL_SETPERM:
  89                 return keyctl_setperm_key(arg2, arg3);
  90
  91         case KEYCTL_INSTANTIATE:
  92                 return keyctl_instantiate_key(arg2, compat_ptr(arg3), arg4,
  93                                               arg5);
  94
  95         case KEYCTL_NEGATE:
  96                 return keyctl_negate_key(arg2, arg3, arg4);
  97
  98         case KEYCTL_SET_REQKEY_KEYRING:
  99                 return keyctl_set_reqkey_keyring(arg2);
 100
 101         case KEYCTL_SET_TIMEOUT:
 102                 return keyctl_set_timeout(arg2, arg3);
 103
 104         case KEYCTL_ASSUME_AUTHORITY:
 105                 return keyctl_assume_authority(arg2);
 106
 107         case KEYCTL_GET_SECURITY:
 108                 return keyctl_get_security(arg2, compat_ptr(arg3), arg4);
 109
 110         case KEYCTL_SESSION_TO_PARENT:
 111                 return keyctl_session_to_parent();
 112
 113         case KEYCTL_REJECT:
 114                 return keyctl_reject_key(arg2, arg3, arg4, arg5);
 115
 116         case KEYCTL_INSTANTIATE_IOV:
 117                 return compat_keyctl_instantiate_key_iov(
 118                         arg2, compat_ptr(arg3), arg4, arg5);
 119
 120         case KEYCTL_INVALIDATE:
 121                 return keyctl_invalidate_key(arg2);
 122
 123         case KEYCTL_GET_PERSISTENT:
 124                 return keyctl_get_persistent(arg2, arg3);
 125
 126         case KEYCTL_DH_COMPUTE:
 127                 return compat_keyctl_dh_compute(compat_ptr(arg2),
 128                                                 compat_ptr(arg3),
 129                                                 arg4, compat_ptr(arg5));
 130
 131         case KEYCTL_RESTRICT_KEYRING:
 132                 return keyctl_restrict_keyring(arg2, compat_ptr(arg3),
 133                                                compat_ptr(arg4));
 134
 135         case KEYCTL_PKEY_QUERY:
 136                 if (arg3 != 0)
 137                         return -EINVAL;
 138                 return keyctl_pkey_query(arg2,
 139                                          compat_ptr(arg4),
 140                                          compat_ptr(arg5));
 141
 142         case KEYCTL_PKEY_ENCRYPT:
 143         case KEYCTL_PKEY_DECRYPT:
 144         case KEYCTL_PKEY_SIGN:
 145                 return keyctl_pkey_e_d_s(option,
 146                                          compat_ptr(arg2), compat_ptr(arg3),
 147                                          compat_ptr(arg4), compat_ptr(arg5));
 148
 149         case KEYCTL_PKEY_VERIFY:
 150                 return keyctl_pkey_verify(compat_ptr(arg2), compat_ptr(arg3),
 151                                           compat_ptr(arg4), compat_ptr(arg5));
 152
 153         case KEYCTL_MOVE:
 154                 return keyctl_keyring_move(arg2, arg3, arg4, arg5);
 155
 156         case KEYCTL_CAPABILITIES:
 157                 return keyctl_capabilities(compat_ptr(arg2), arg3);
 158
 159         case KEYCTL_WATCH_KEY:
 160                 return keyctl_watch_key(arg2, arg3, arg4);
 161
 162         default:
 163                 return -EOPNOTSUPP;
 164         }
 165 }