84 lines
2.8 KiB
C
84 lines
2.8 KiB
C
/*
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* Copyright (c) 2020 Apple Inc. All rights reserved.
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*
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* @APPLE_OSREFERENCE_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. The rights granted to you under the License
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* may not be used to create, or enable the creation or redistribution of,
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* unlawful or unlicensed copies of an Apple operating system, or to
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* circumvent, violate, or enable the circumvention or violation of, any
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* terms of an Apple operating system software license agreement.
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*
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* Please obtain a copy of the License at
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* http://www.opensource.apple.com/apsl/ and read it before using this 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_OSREFERENCE_LICENSE_HEADER_END@
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*/
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#include <IOKit/IOLib.h>
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#include <kern/debug.h> // for panic()
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#include <libkern/ptrauth_utils.h>
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/*
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* On ptrauth systems, ptrauth_utils_sign_blob_generic is implemented
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* in osfmk/arm64/machine_routines_asm.s
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*/
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#if !__has_feature(ptrauth_calls)
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ptrauth_generic_signature_t
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ptrauth_utils_sign_blob_generic(__unused const void * ptr, __unused size_t len_bytes, __unused uint64_t data, __unused int flags)
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{
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return 0;
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}
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#endif // __has_feature(ptrauth_calls)
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/*
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* ptrauth_utils_auth_blob_generic
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*
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* Authenticate signature produced by ptrauth_utils_sign_blob_generic
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*/
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#if __has_feature(ptrauth_calls)
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__attribute__((noinline))
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void
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ptrauth_utils_auth_blob_generic(const void * ptr, size_t len_bytes, uint64_t data, int flags, ptrauth_generic_signature_t signature)
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{
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ptrauth_generic_signature_t calculated_signature = 0;
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if (ptr == NULL) {
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if (flags & PTRAUTH_NON_NULL) {
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panic("ptrauth_utils_auth_blob_generic: ptr must not be NULL");
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} else {
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return;
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}
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}
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if ((calculated_signature = ptrauth_utils_sign_blob_generic(ptr, len_bytes, data, flags)) == signature) {
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return;
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} else {
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panic("signature mismatch for %lu bytes at %p, calculated %lx vs %lx", len_bytes,
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ptr,
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calculated_signature,
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signature);
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}
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}
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#else
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void
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ptrauth_utils_auth_blob_generic(__unused const void * ptr, __unused size_t len_bytes, __unused uint64_t data, __unused int flags, __unused ptrauth_generic_signature_t signature)
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{
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return;
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}
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#endif // __has_feature(ptrauth_calls)
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