/*
* Copyright (c) 2020 Apple Inc. All rights reserved.
*
* @APPLE_OSREFERENCE_LICENSE_HEADER_START@
*
* This file contains Original Code and/or Modifications of Original Code
* as defined in and that are subject to the Apple Public Source License
* Version 2.0 (the 'License'). You may not use this file except in
* compliance with the License. The rights granted to you under the License
* may not be used to create, or enable the creation or redistribution of,
* unlawful or unlicensed copies of an Apple operating system, or to
* circumvent, violate, or enable the circumvention or violation of, any
* terms of an Apple operating system software license agreement.
*
* Please obtain a copy of the License at
* http://www.opensource.apple.com/apsl/ and read it before using this file.
*
* The Original Code and all software distributed under the License are
* distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
* EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
* INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
* Please see the License for the specific language governing rights and
* limitations under the License.
*
* @APPLE_OSREFERENCE_LICENSE_HEADER_END@
*/
#include <IOKit/IOLib.h>
#include <kern/debug.h> // for panic()
#include <libkern/ptrauth_utils.h>
/*
* On ptrauth systems, ptrauth_utils_sign_blob_generic is implemented
* in osfmk/arm64/machine_routines_asm.s
*/
#if !__has_feature(ptrauth_calls)
ptrauth_generic_signature_t
ptrauth_utils_sign_blob_generic(__unused const void * ptr, __unused size_t len_bytes, __unused uint64_t data, __unused int flags)
{
return 0;
}
#endif // __has_feature(ptrauth_calls)
/*
* ptrauth_utils_auth_blob_generic
*
* Authenticate signature produced by ptrauth_utils_sign_blob_generic
*/
#if __has_feature(ptrauth_calls)
__attribute__((noinline))
void
ptrauth_utils_auth_blob_generic(const void * ptr, size_t len_bytes, uint64_t data, int flags, ptrauth_generic_signature_t signature)
{
ptrauth_generic_signature_t calculated_signature = 0;
if (ptr == NULL) {
if (flags & PTRAUTH_NON_NULL) {
panic("ptrauth_utils_auth_blob_generic: ptr must not be NULL");
} else {
return;
}
}
if ((calculated_signature = ptrauth_utils_sign_blob_generic(ptr, len_bytes, data, flags)) == signature) {
return;
} else {
panic("signature mismatch for %lu bytes at %p, calculated %lx vs %lx", len_bytes,
ptr,
calculated_signature,
signature);
}
}
#else
void
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)
{
return;
}
#endif // __has_feature(ptrauth_calls)