1*4d495c6eSApple OSS Distributions /*
2*4d495c6eSApple OSS Distributions * Copyright (c) 2020 Apple Inc. All rights reserved.
3*4d495c6eSApple OSS Distributions *
4*4d495c6eSApple OSS Distributions * @APPLE_OSREFERENCE_LICENSE_HEADER_START@
5*4d495c6eSApple OSS Distributions *
6*4d495c6eSApple OSS Distributions * This file contains Original Code and/or Modifications of Original Code
7*4d495c6eSApple OSS Distributions * as defined in and that are subject to the Apple Public Source License
8*4d495c6eSApple OSS Distributions * Version 2.0 (the 'License'). You may not use this file except in
9*4d495c6eSApple OSS Distributions * compliance with the License. The rights granted to you under the License
10*4d495c6eSApple OSS Distributions * may not be used to create, or enable the creation or redistribution of,
11*4d495c6eSApple OSS Distributions * unlawful or unlicensed copies of an Apple operating system, or to
12*4d495c6eSApple OSS Distributions * circumvent, violate, or enable the circumvention or violation of, any
13*4d495c6eSApple OSS Distributions * terms of an Apple operating system software license agreement.
14*4d495c6eSApple OSS Distributions *
15*4d495c6eSApple OSS Distributions * Please obtain a copy of the License at
16*4d495c6eSApple OSS Distributions * http://www.opensource.apple.com/apsl/ and read it before using this file.
17*4d495c6eSApple OSS Distributions *
18*4d495c6eSApple OSS Distributions * The Original Code and all software distributed under the License are
19*4d495c6eSApple OSS Distributions * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
20*4d495c6eSApple OSS Distributions * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
21*4d495c6eSApple OSS Distributions * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
22*4d495c6eSApple OSS Distributions * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
23*4d495c6eSApple OSS Distributions * Please see the License for the specific language governing rights and
24*4d495c6eSApple OSS Distributions * limitations under the License.
25*4d495c6eSApple OSS Distributions *
26*4d495c6eSApple OSS Distributions * @APPLE_OSREFERENCE_LICENSE_HEADER_END@
27*4d495c6eSApple OSS Distributions */
28*4d495c6eSApple OSS Distributions
29*4d495c6eSApple OSS Distributions #include <IOKit/IOLib.h>
30*4d495c6eSApple OSS Distributions #include <kern/debug.h> // for panic()
31*4d495c6eSApple OSS Distributions
32*4d495c6eSApple OSS Distributions #include <libkern/ptrauth_utils.h>
33*4d495c6eSApple OSS Distributions
34*4d495c6eSApple OSS Distributions /*
35*4d495c6eSApple OSS Distributions * On ptrauth systems, ptrauth_utils_sign_blob_generic is implemented
36*4d495c6eSApple OSS Distributions * in osfmk/arm64/machine_routines_asm.s
37*4d495c6eSApple OSS Distributions */
38*4d495c6eSApple OSS Distributions
39*4d495c6eSApple OSS Distributions #if !__has_feature(ptrauth_calls)
40*4d495c6eSApple 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*4d495c6eSApple OSS Distributions ptrauth_utils_sign_blob_generic(__unused const void * ptr, __unused size_t len_bytes, __unused uint64_t data, __unused int flags)
42*4d495c6eSApple OSS Distributions {
43*4d495c6eSApple OSS Distributions return 0;
44*4d495c6eSApple OSS Distributions }
45*4d495c6eSApple OSS Distributions #endif // __has_feature(ptrauth_calls)
46*4d495c6eSApple OSS Distributions
47*4d495c6eSApple OSS Distributions
48*4d495c6eSApple OSS Distributions /*
49*4d495c6eSApple OSS Distributions * ptrauth_utils_auth_blob_generic
50*4d495c6eSApple OSS Distributions *
51*4d495c6eSApple OSS Distributions * Authenticate signature produced by ptrauth_utils_sign_blob_generic
52*4d495c6eSApple OSS Distributions */
53*4d495c6eSApple OSS Distributions
54*4d495c6eSApple OSS Distributions #if __has_feature(ptrauth_calls)
55*4d495c6eSApple OSS Distributions __attribute__((noinline))
56*4d495c6eSApple 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*4d495c6eSApple 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*4d495c6eSApple OSS Distributions {
59*4d495c6eSApple OSS Distributions ptrauth_generic_signature_t calculated_signature = 0;
60*4d495c6eSApple OSS Distributions
61*4d495c6eSApple OSS Distributions if (ptr == NULL) {
62*4d495c6eSApple OSS Distributions if (flags & PTRAUTH_NON_NULL) {
63*4d495c6eSApple OSS Distributions panic("ptrauth_utils_auth_blob_generic: ptr must not be NULL");
64*4d495c6eSApple OSS Distributions } else {
65*4d495c6eSApple OSS Distributions return;
66*4d495c6eSApple OSS Distributions }
67*4d495c6eSApple OSS Distributions }
68*4d495c6eSApple OSS Distributions
69*4d495c6eSApple OSS Distributions if ((calculated_signature = ptrauth_utils_sign_blob_generic(ptr, len_bytes, data, flags)) == signature) {
70*4d495c6eSApple OSS Distributions return;
71*4d495c6eSApple OSS Distributions } else {
72*4d495c6eSApple OSS Distributions panic("signature mismatch for %lu bytes at %p, calculated %lx vs %lx", len_bytes,
73*4d495c6eSApple OSS Distributions ptr,
74*4d495c6eSApple OSS Distributions calculated_signature,
75*4d495c6eSApple OSS Distributions signature);
76*4d495c6eSApple OSS Distributions }
77*4d495c6eSApple OSS Distributions }
78*4d495c6eSApple OSS Distributions #else
79*4d495c6eSApple 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*4d495c6eSApple 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*4d495c6eSApple OSS Distributions {
82*4d495c6eSApple OSS Distributions return;
83*4d495c6eSApple OSS Distributions }
84*4d495c6eSApple OSS Distributions #endif // __has_feature(ptrauth_calls)
85