33 lines
766 B
C
33 lines
766 B
C
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#include <sys/cdefs.h>
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__FBSDID("$FreeBSD$");
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#include <sys/types.h>
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#include <sys/param.h>
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#include <sys/kernel.h>
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#include <sys/systm.h>
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#include <sys/libkern.h>
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long __stack_chk_guard[8] = {};
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void __stack_chk_fail(void);
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void
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__stack_chk_fail(void)
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{
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panic("stack overflow detected; backtrace may be corrupted");
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}
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#define __arraycount(__x) (sizeof(__x) / sizeof(__x[0]))
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static void
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__stack_chk_init(void *dummy __unused)
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{
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size_t i;
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long guard[__arraycount(__stack_chk_guard)];
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arc4rand(guard, sizeof(guard), 0);
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for (i = 0; i < __arraycount(guard); i++)
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__stack_chk_guard[i] = guard[i];
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}
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/* SI_SUB_EVENTHANDLER is right after SI_SUB_LOCK used by arc4rand() init. */
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SYSINIT(stack_chk, SI_SUB_EVENTHANDLER, SI_ORDER_ANY, __stack_chk_init, NULL);
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