security/keys/compat.c

   1 /* compat.c: 32-bit compatibility syscall for 64-bit systems
   2  *
   3  * Copyright (C) 2004 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/sched.h>
  13 #include <linux/syscalls.h>
  14 #include <linux/keyctl.h>
  15 #include <linux/compat.h>
  16 #include "internal.h"
  17
  18 /*****************************************************************************/
  19 /*
  20  * the key control system call, 32-bit compatibility version for 64-bit archs
  21  * - this should only be called if the 64-bit arch uses weird pointers in
  22  *   32-bit mode or doesn't guarantee that the top 32-bits of the argument
  23  *   registers on taking a 32-bit syscall are zero
  24  * - if you can, you should call sys_keyctl directly
  25  */
  26 asmlinkage long compat_sys_keyctl(u32 option,
  27                               u32 arg2, u32 arg3, u32 arg4, u32 arg5)
  28 {
  29         switch (option) {
  30         case KEYCTL_GET_KEYRING_ID:
  31                 return keyctl_get_keyring_ID(arg2, arg3);
  32
  33         case KEYCTL_JOIN_SESSION_KEYRING:
  34                 return keyctl_join_session_keyring(compat_ptr(arg2));
  35
  36         case KEYCTL_UPDATE:
  37                 return keyctl_update_key(arg2, compat_ptr(arg3), arg4);
  38
  39         case KEYCTL_REVOKE:
  40                 return keyctl_revoke_key(arg2);
  41
  42         case KEYCTL_DESCRIBE:
  43                 return keyctl_describe_key(arg2, compat_ptr(arg3), arg4);
  44
  45         case KEYCTL_CLEAR:
  46                 return keyctl_keyring_clear(arg2);
  47
  48         case KEYCTL_LINK:
  49                 return keyctl_keyring_link(arg2, arg3);
  50
  51         case KEYCTL_UNLINK:
  52                 return keyctl_keyring_unlink(arg2, arg3);
  53
  54         case KEYCTL_SEARCH:
  55                 return keyctl_keyring_search(arg2, compat_ptr(arg3),
  56                                              compat_ptr(arg4), arg5);
  57
  58         case KEYCTL_READ:
  59                 return keyctl_read_key(arg2, compat_ptr(arg3), arg4);
  60
  61         case KEYCTL_CHOWN:
  62                 return keyctl_chown_key(arg2, arg3, arg4);
  63
  64         case KEYCTL_SETPERM:
  65                 return keyctl_setperm_key(arg2, arg3);
  66
  67         case KEYCTL_INSTANTIATE:
  68                 return keyctl_instantiate_key(arg2, compat_ptr(arg3), arg4,
  69                                               arg5);
  70
  71         case KEYCTL_NEGATE:
  72                 return keyctl_negate_key(arg2, arg3, arg4);
  73
  74         default:
  75                 return -EOPNOTSUPP;
  76         }
  77
  78 } /* end compat_sys_keyctl() */