1#include <sys/cdefs.h>
2#include <sys/types.h>
3#include <sys/param.h>
4#include <sys/kernel.h>
5#include <sys/systm.h>
6#include <sys/libkern.h>
7
8long __stack_chk_guard[8] = {};
9void __stack_chk_fail(void);
10
11void
12__stack_chk_fail(void)
13{
14
15	panic("stack overflow detected; backtrace may be corrupted");
16}
17
18static void
19__stack_chk_init(void *dummy __unused)
20{
21	size_t i;
22	long guard[nitems(__stack_chk_guard)];
23
24	arc4rand(guard, sizeof(guard), 0);
25	for (i = 0; i < nitems(guard); i++)
26		__stack_chk_guard[i] = guard[i];
27}
28SYSINIT(stack_chk, SI_SUB_RANDOM, SI_ORDER_ANY, __stack_chk_init, NULL);
29