runtime/objc-ptrauth.h

   1 /*
   2  * Copyright (c) 2017 Apple Inc.  All Rights Reserved.
   3  *
   4  * @APPLE_LICENSE_HEADER_START@
   5  *
   6  * This file contains Original Code and/or Modifications of Original Code
   7  * as defined in and that are subject to the Apple Public Source License
   8  * Version 2.0 (the 'License'). You may not use this file except in
   9  * compliance with the License. Please obtain a copy of the License at
  10  * http://www.opensource.apple.com/apsl/ and read it before using this
  11  * file.
  12  *
  13  * The Original Code and all software distributed under the License are
  14  * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
  15  * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
  16  * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
  17  * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
  18  * Please see the License for the specific language governing rights and
  19  * limitations under the License.
  20  *
  21  * @APPLE_LICENSE_HEADER_END@
  22  */
  23
  24 #ifndef _OBJC_PTRAUTH_H_
  25 #define _OBJC_PTRAUTH_H_
  26
  27 #include <objc/objc.h>
  28
  29 // On some architectures, method lists and method caches store signed IMPs.
  30
  31 // StorageSignedFunctionPointer is declared by libclosure.
  32 #include <Block_private.h>
  33
  34 // fixme simply include ptrauth.h once all build trains have it
  35 #if __has_include (<ptrauth.h>)
  36 #include <ptrauth.h>
  37 #else
  38 #define ptrauth_strip(__value, __key) __value
  39 #define ptrauth_blend_discriminator(__pointer, __integer) ((uintptr_t)0)
  40 #define ptrauth_sign_constant(__value, __key, __data) __value
  41 #define ptrauth_sign_unauthenticated(__value, __key, __data) __value
  42 #define ptrauth_auth_and_resign(__value, __old_key, __old_data, __new_key, __new_data) __value
  43 #define ptrauth_auth_function(__value, __old_key, __old_data) __value
  44 #define ptrauth_auth_data(__value, __old_key, __old_data) __value
  45 #define ptrauth_string_discriminator(__string) ((int)0)
  46 #define ptrauth_sign_generic_data(__value, __data) ((ptrauth_generic_signature_t)0)
  47
  48 #define __ptrauth_function_pointer
  49 #define __ptrauth_return_address
  50 #define __ptrauth_block_invocation_pointer
  51 #define __ptrauth_block_copy_helper
  52 #define __ptrauth_block_destroy_helper
  53 #define __ptrauth_block_byref_copy_helper
  54 #define __ptrauth_block_byref_destroy_helper
  55 #define __ptrauth_objc_method_list_imp
  56 #define __ptrauth_cxx_vtable_pointer
  57 #define __ptrauth_cxx_vtt_vtable_pointer
  58 #define __ptrauth_swift_heap_object_destructor
  59 #define __ptrauth_cxx_virtual_function_pointer(__declkey)
  60 #define __ptrauth_swift_function_pointer(__typekey)
  61 #define __ptrauth_swift_class_method_pointer(__declkey)
  62 #define __ptrauth_swift_protocol_witness_function_pointer(__declkey)
  63 #define __ptrauth_swift_value_witness_function_pointer(__key)
  64 #endif
  65
  66
  67 #if __has_feature(ptrauth_calls)
  68
  69 // Method lists use process-independent signature for compatibility.
  70 // Method caches use process-dependent signature for extra protection.
  71 //   (fixme not yet __ptrauth(...) because of `stp` inline asm in objc-cache.mm)
  72 using MethodListIMP = IMP __ptrauth_objc_method_list_imp;
  73 using MethodCacheIMP =
  74     StorageSignedFunctionPointer<IMP, ptrauth_key_process_dependent_code>;
  75
  76 #else
  77
  78 using MethodListIMP = IMP;
  79 using MethodCacheIMP = IMP;
  80
  81 #endif
  82
  83 // _OBJC_PTRAUTH_H_
  84 #endif