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 */ 27 static 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 goto err; 44 if (ret == 0) 45 goto no_payload_free; 46 47 ret = keyctl_instantiate_key_common(id, iov, ioc, ret, ringid); 48 err: 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 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 */ 68 asmlinkage 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