1042df2e2SRuslan Ermilov #include <sys/cdefs.h> 2042df2e2SRuslan Ermilov #include <sys/types.h> 3042df2e2SRuslan Ermilov #include <sys/param.h> 4042df2e2SRuslan Ermilov #include <sys/kernel.h> 5042df2e2SRuslan Ermilov #include <sys/systm.h> 6042df2e2SRuslan Ermilov #include <sys/libkern.h> 7042df2e2SRuslan Ermilov 8042df2e2SRuslan Ermilov long __stack_chk_guard[8] = {}; 9042df2e2SRuslan Ermilov void __stack_chk_fail(void); 10042df2e2SRuslan Ermilov 11042df2e2SRuslan Ermilov void __stack_chk_fail(void)12042df2e2SRuslan Ermilov__stack_chk_fail(void) 13042df2e2SRuslan Ermilov { 14042df2e2SRuslan Ermilov 15042df2e2SRuslan Ermilov panic("stack overflow detected; backtrace may be corrupted"); 16042df2e2SRuslan Ermilov } 17042df2e2SRuslan Ermilov 18042df2e2SRuslan Ermilov static void __stack_chk_init(void * dummy __unused)19042df2e2SRuslan Ermilov__stack_chk_init(void *dummy __unused) 20042df2e2SRuslan Ermilov { 21042df2e2SRuslan Ermilov size_t i; 22708694f7SPedro F. Giffuni long guard[nitems(__stack_chk_guard)]; 23042df2e2SRuslan Ermilov 24042df2e2SRuslan Ermilov arc4rand(guard, sizeof(guard), 0); 25708694f7SPedro F. Giffuni for (i = 0; i < nitems(guard); i++) 26042df2e2SRuslan Ermilov __stack_chk_guard[i] = guard[i]; 27042df2e2SRuslan Ermilov } 28e64585bdSRuslan Ermilov SYSINIT(stack_chk, SI_SUB_RANDOM, SI_ORDER_ANY, __stack_chk_init, NULL); 29