1*043036a2SApple OSS Distributions /*
2*043036a2SApple OSS Distributions * Copyright (c) 2020 Apple Inc. All rights reserved.
3*043036a2SApple OSS Distributions *
4*043036a2SApple OSS Distributions * @APPLE_OSREFERENCE_LICENSE_HEADER_START@
5*043036a2SApple OSS Distributions *
6*043036a2SApple OSS Distributions * This file contains Original Code and/or Modifications of Original Code
7*043036a2SApple OSS Distributions * as defined in and that are subject to the Apple Public Source License
8*043036a2SApple OSS Distributions * Version 2.0 (the 'License'). You may not use this file except in
9*043036a2SApple OSS Distributions * compliance with the License. The rights granted to you under the License
10*043036a2SApple OSS Distributions * may not be used to create, or enable the creation or redistribution of,
11*043036a2SApple OSS Distributions * unlawful or unlicensed copies of an Apple operating system, or to
12*043036a2SApple OSS Distributions * circumvent, violate, or enable the circumvention or violation of, any
13*043036a2SApple OSS Distributions * terms of an Apple operating system software license agreement.
14*043036a2SApple OSS Distributions *
15*043036a2SApple OSS Distributions * Please obtain a copy of the License at
16*043036a2SApple OSS Distributions * http://www.opensource.apple.com/apsl/ and read it before using this file.
17*043036a2SApple OSS Distributions *
18*043036a2SApple OSS Distributions * The Original Code and all software distributed under the License are
19*043036a2SApple OSS Distributions * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
20*043036a2SApple OSS Distributions * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
21*043036a2SApple OSS Distributions * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
22*043036a2SApple OSS Distributions * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
23*043036a2SApple OSS Distributions * Please see the License for the specific language governing rights and
24*043036a2SApple OSS Distributions * limitations under the License.
25*043036a2SApple OSS Distributions *
26*043036a2SApple OSS Distributions * @APPLE_OSREFERENCE_LICENSE_HEADER_END@
27*043036a2SApple OSS Distributions */
28*043036a2SApple OSS Distributions
29*043036a2SApple OSS Distributions #include <IOKit/IOLib.h>
30*043036a2SApple OSS Distributions #include <kern/debug.h> // for panic()
31*043036a2SApple OSS Distributions
32*043036a2SApple OSS Distributions #include <libkern/ptrauth_utils.h>
33*043036a2SApple OSS Distributions
34*043036a2SApple OSS Distributions /*
35*043036a2SApple OSS Distributions * On ptrauth systems, ptrauth_utils_sign_blob_generic is implemented
36*043036a2SApple OSS Distributions * in osfmk/arm64/machine_routines_asm.s
37*043036a2SApple OSS Distributions */
38*043036a2SApple OSS Distributions
39*043036a2SApple OSS Distributions #if !__has_feature(ptrauth_calls)
40*043036a2SApple OSS Distributions 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)41*043036a2SApple OSS Distributions ptrauth_utils_sign_blob_generic(__unused const void * ptr, __unused size_t len_bytes, __unused uint64_t data, __unused int flags)
42*043036a2SApple OSS Distributions {
43*043036a2SApple OSS Distributions return 0;
44*043036a2SApple OSS Distributions }
45*043036a2SApple OSS Distributions #endif // __has_feature(ptrauth_calls)
46*043036a2SApple OSS Distributions
47*043036a2SApple OSS Distributions
48*043036a2SApple OSS Distributions /*
49*043036a2SApple OSS Distributions * ptrauth_utils_auth_blob_generic
50*043036a2SApple OSS Distributions *
51*043036a2SApple OSS Distributions * Authenticate signature produced by ptrauth_utils_sign_blob_generic
52*043036a2SApple OSS Distributions */
53*043036a2SApple OSS Distributions
54*043036a2SApple OSS Distributions #if __has_feature(ptrauth_calls)
55*043036a2SApple OSS Distributions __attribute__((noinline))
56*043036a2SApple OSS Distributions void
ptrauth_utils_auth_blob_generic(const void * ptr,size_t len_bytes,uint64_t data,int flags,ptrauth_generic_signature_t signature)57*043036a2SApple OSS Distributions ptrauth_utils_auth_blob_generic(const void * ptr, size_t len_bytes, uint64_t data, int flags, ptrauth_generic_signature_t signature)
58*043036a2SApple OSS Distributions {
59*043036a2SApple OSS Distributions ptrauth_generic_signature_t calculated_signature = 0;
60*043036a2SApple OSS Distributions
61*043036a2SApple OSS Distributions if (ptr == NULL) {
62*043036a2SApple OSS Distributions if (flags & PTRAUTH_NON_NULL) {
63*043036a2SApple OSS Distributions panic("ptrauth_utils_auth_blob_generic: ptr must not be NULL");
64*043036a2SApple OSS Distributions } else {
65*043036a2SApple OSS Distributions return;
66*043036a2SApple OSS Distributions }
67*043036a2SApple OSS Distributions }
68*043036a2SApple OSS Distributions
69*043036a2SApple OSS Distributions if ((calculated_signature = ptrauth_utils_sign_blob_generic(ptr, len_bytes, data, flags)) == signature) {
70*043036a2SApple OSS Distributions return;
71*043036a2SApple OSS Distributions } else {
72*043036a2SApple OSS Distributions panic("signature mismatch for %lu bytes at %p, calculated %lx vs %lx", len_bytes,
73*043036a2SApple OSS Distributions ptr,
74*043036a2SApple OSS Distributions calculated_signature,
75*043036a2SApple OSS Distributions signature);
76*043036a2SApple OSS Distributions }
77*043036a2SApple OSS Distributions }
78*043036a2SApple OSS Distributions #else
79*043036a2SApple OSS Distributions 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)80*043036a2SApple OSS Distributions 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)
81*043036a2SApple OSS Distributions {
82*043036a2SApple OSS Distributions return;
83*043036a2SApple OSS Distributions }
84*043036a2SApple OSS Distributions #endif // __has_feature(ptrauth_calls)
85