mirror of
https://github.com/darlinghq/darling-dyld.git
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91 lines
3.3 KiB
C++
91 lines
3.3 KiB
C++
/*
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* Copyright (c) 2017 Apple Inc. All rights reserved.
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*
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* @APPLE_LICENSE_HEADER_START@
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*
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* This file contains Original Code and/or Modifications of Original Code
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* as defined in and that are subject to the Apple Public Source License
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* Version 2.0 (the 'License'). You may not use this file except in
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* compliance with the License. Please obtain a copy of the License at
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* http://www.opensource.apple.com/apsl/ and read it before using this
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* file.
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*
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* The Original Code and all software distributed under the License are
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* distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
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* EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
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* INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
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* Please see the License for the specific language governing rights and
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* limitations under the License.
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*
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* @APPLE_LICENSE_HEADER_END@
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*/
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#ifndef __DYLD_POINTER_AUTH_H__
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#define __DYLD_POINTER_AUTH_H__
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#include <ptrauth.h>
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#if __has_feature(ptrauth_calls)
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#define __ptrauth_dyld_address_auth __ptrauth(ptrauth_key_process_dependent_data, 1, 0)
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#define __ptrauth_dyld_function_ptr __ptrauth(ptrauth_key_process_dependent_code, 1, 0)
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#else
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#define __ptrauth_dyld_address_auth
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#define __ptrauth_dyld_function_ptr
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#endif
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namespace dyld3 {
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// On arm64e, signs the given pointer with the address of where it is stored.
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// Other archs just have a regular pointer
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#pragma clang diagnostic push
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#pragma clang diagnostic ignored "-Wptrauth-null-pointers"
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template<typename T>
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struct AuthenticatedValue {
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static_assert(sizeof(T) <= sizeof(uintptr_t));
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AuthenticatedValue() {
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this->value = ptrauth_sign_unauthenticated(nullptr, ptrauth_key_process_dependent_data, this);
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}
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~AuthenticatedValue() = default;
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AuthenticatedValue(const AuthenticatedValue& other) {
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this->value = ptrauth_auth_and_resign(other.value,
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ptrauth_key_process_dependent_data, &other,
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ptrauth_key_process_dependent_data, this);
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}
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AuthenticatedValue(AuthenticatedValue&& other) {
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this->value = ptrauth_auth_and_resign(other.value,
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ptrauth_key_process_dependent_data, &other,
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ptrauth_key_process_dependent_data, this);
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other.value = ptrauth_sign_unauthenticated(nullptr, ptrauth_key_process_dependent_data, &other);
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}
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AuthenticatedValue& operator=(const AuthenticatedValue&) = delete;
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AuthenticatedValue& operator=(AuthenticatedValue&&) = delete;
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// Add a few convenience methods for interoperating with values of the given type
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AuthenticatedValue& operator=(const T& other) {
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this->value = ptrauth_sign_unauthenticated(other, ptrauth_key_process_dependent_data, this);
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return *this;
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}
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bool operator==(const T& other) const {
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return ptrauth_auth_data(this->value, ptrauth_key_process_dependent_data, this) == other;
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}
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bool operator!=(const T& other) const {
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return ptrauth_auth_data(this->value, ptrauth_key_process_dependent_data, this) != other;
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}
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private:
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const void* value;
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};
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#pragma clang diagnostic pop
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} // namespace dyld3
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#endif // __DYLD_POINTER_AUTH_H__
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