79 lines
2.4 KiB
C
79 lines
2.4 KiB
C
/*
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* Copyright (c) 2021 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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#if (DEVELOPMENT || DEBUG) && !KASAN
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#include <sys/sysctl.h>
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#include <libkern/stack_protector.h>
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__attribute__((noinline))
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static int
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check_for_cookie(size_t len)
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{
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long buf[4];
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long *search = (long *)(void *)&buf[0];
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size_t n;
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assert(len < sizeof(buf));
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assert(__stack_chk_guard != 0);
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assert(((uintptr_t)search & (sizeof(long) - 1)) == 0);
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/* force compiler to insert stack cookie check: */
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memset_s(buf, len, 0, len);
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/* 32 x sizeof(long) should be plenty to find the cookie: */
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for (n = 0; n < 32; ++n) {
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if (*(search++) == __stack_chk_guard) {
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return 0;
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}
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}
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return ESRCH;
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}
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static int
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sysctl_run_stack_chk_tests SYSCTL_HANDLER_ARGS
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{
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#pragma unused(arg1, arg2, oidp)
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unsigned int dummy = 0;
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int error, changed = 0, kr;
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error = sysctl_io_number(req, 0, sizeof(dummy), &dummy, &changed);
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if (error || !changed) {
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return error;
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}
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kr = check_for_cookie(3);
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return kr;
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}
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SYSCTL_PROC(_kern, OID_AUTO, run_stack_chk_tests,
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CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_LOCKED | CTLFLAG_MASKED,
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0, 0, sysctl_run_stack_chk_tests, "I", "");
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#endif /* (DEVELOPMENT || DEBUG) && !KASAN */
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