1*aca3beaaSApple OSS Distributions /*
2*aca3beaaSApple OSS Distributions * Copyright (c) 2021 Apple Inc. All rights reserved.
3*aca3beaaSApple OSS Distributions *
4*aca3beaaSApple OSS Distributions * @APPLE_OSREFERENCE_LICENSE_HEADER_START@
5*aca3beaaSApple OSS Distributions *
6*aca3beaaSApple OSS Distributions * This file contains Original Code and/or Modifications of Original Code
7*aca3beaaSApple OSS Distributions * as defined in and that are subject to the Apple Public Source License
8*aca3beaaSApple OSS Distributions * Version 2.0 (the 'License'). You may not use this file except in
9*aca3beaaSApple OSS Distributions * compliance with the License. The rights granted to you under the License
10*aca3beaaSApple OSS Distributions * may not be used to create, or enable the creation or redistribution of,
11*aca3beaaSApple OSS Distributions * unlawful or unlicensed copies of an Apple operating system, or to
12*aca3beaaSApple OSS Distributions * circumvent, violate, or enable the circumvention or violation of, any
13*aca3beaaSApple OSS Distributions * terms of an Apple operating system software license agreement.
14*aca3beaaSApple OSS Distributions *
15*aca3beaaSApple OSS Distributions * Please obtain a copy of the License at
16*aca3beaaSApple OSS Distributions * http://www.opensource.apple.com/apsl/ and read it before using this file.
17*aca3beaaSApple OSS Distributions *
18*aca3beaaSApple OSS Distributions * The Original Code and all software distributed under the License are
19*aca3beaaSApple OSS Distributions * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
20*aca3beaaSApple OSS Distributions * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
21*aca3beaaSApple OSS Distributions * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
22*aca3beaaSApple OSS Distributions * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
23*aca3beaaSApple OSS Distributions * Please see the License for the specific language governing rights and
24*aca3beaaSApple OSS Distributions * limitations under the License.
25*aca3beaaSApple OSS Distributions *
26*aca3beaaSApple OSS Distributions * @APPLE_OSREFERENCE_LICENSE_HEADER_END@
27*aca3beaaSApple OSS Distributions */
28*aca3beaaSApple OSS Distributions
29*aca3beaaSApple OSS Distributions #if (DEVELOPMENT || DEBUG) && !KASAN
30*aca3beaaSApple OSS Distributions
31*aca3beaaSApple OSS Distributions #include <sys/sysctl.h>
32*aca3beaaSApple OSS Distributions #include <libkern/stack_protector.h>
33*aca3beaaSApple OSS Distributions
34*aca3beaaSApple OSS Distributions __attribute__((noinline))
35*aca3beaaSApple OSS Distributions static int
check_for_cookie(const char * str,size_t len)36*aca3beaaSApple OSS Distributions check_for_cookie(const char *str, size_t len)
37*aca3beaaSApple OSS Distributions {
38*aca3beaaSApple OSS Distributions long buf[4];
39*aca3beaaSApple OSS Distributions long *search = (long *)(void *)&buf[0];
40*aca3beaaSApple OSS Distributions size_t n;
41*aca3beaaSApple OSS Distributions
42*aca3beaaSApple OSS Distributions assert(len < sizeof(buf));
43*aca3beaaSApple OSS Distributions assert(__stack_chk_guard != 0);
44*aca3beaaSApple OSS Distributions assert(((uintptr_t)search & (sizeof(long) - 1)) == 0);
45*aca3beaaSApple OSS Distributions
46*aca3beaaSApple OSS Distributions /* force compiler to insert stack cookie check: */
47*aca3beaaSApple OSS Distributions memcpy(buf, str, len);
48*aca3beaaSApple OSS Distributions
49*aca3beaaSApple OSS Distributions /* 32 x sizeof(long) should be plenty to find the cookie: */
50*aca3beaaSApple OSS Distributions for (n = 0; n < 32; ++n) {
51*aca3beaaSApple OSS Distributions if (*(search++) == __stack_chk_guard) {
52*aca3beaaSApple OSS Distributions return 0;
53*aca3beaaSApple OSS Distributions }
54*aca3beaaSApple OSS Distributions }
55*aca3beaaSApple OSS Distributions
56*aca3beaaSApple OSS Distributions return ESRCH;
57*aca3beaaSApple OSS Distributions }
58*aca3beaaSApple OSS Distributions
59*aca3beaaSApple OSS Distributions static int
60*aca3beaaSApple OSS Distributions sysctl_run_stack_chk_tests SYSCTL_HANDLER_ARGS
61*aca3beaaSApple OSS Distributions {
62*aca3beaaSApple OSS Distributions #pragma unused(arg1, arg2, oidp)
63*aca3beaaSApple OSS Distributions
64*aca3beaaSApple OSS Distributions unsigned int dummy = 0;
65*aca3beaaSApple OSS Distributions int error, changed = 0, kr;
66*aca3beaaSApple OSS Distributions error = sysctl_io_number(req, 0, sizeof(dummy), &dummy, &changed);
67*aca3beaaSApple OSS Distributions if (error || !changed) {
68*aca3beaaSApple OSS Distributions return error;
69*aca3beaaSApple OSS Distributions }
70*aca3beaaSApple OSS Distributions
71*aca3beaaSApple OSS Distributions kr = check_for_cookie("foo", 3);
72*aca3beaaSApple OSS Distributions return kr;
73*aca3beaaSApple OSS Distributions }
74*aca3beaaSApple OSS Distributions
75*aca3beaaSApple OSS Distributions SYSCTL_PROC(_kern, OID_AUTO, run_stack_chk_tests,
76*aca3beaaSApple OSS Distributions CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_LOCKED | CTLFLAG_MASKED,
77*aca3beaaSApple OSS Distributions 0, 0, sysctl_run_stack_chk_tests, "I", "");
78*aca3beaaSApple OSS Distributions
79*aca3beaaSApple OSS Distributions #endif /* (DEVELOPMENT || DEBUG) && !KASAN */
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