1042df2e2SRuslan Ermilov #include <sys/cdefs.h> 2042df2e2SRuslan Ermilov __FBSDID("$FreeBSD$"); 3042df2e2SRuslan Ermilov 4042df2e2SRuslan Ermilov #include <sys/types.h> 5042df2e2SRuslan Ermilov #include <sys/param.h> 6042df2e2SRuslan Ermilov #include <sys/kernel.h> 7042df2e2SRuslan Ermilov #include <sys/systm.h> 8042df2e2SRuslan Ermilov #include <sys/libkern.h> 9042df2e2SRuslan Ermilov 10042df2e2SRuslan Ermilov long __stack_chk_guard[8] = {}; 11042df2e2SRuslan Ermilov void __stack_chk_fail(void); 12042df2e2SRuslan Ermilov 13042df2e2SRuslan Ermilov void 14042df2e2SRuslan Ermilov __stack_chk_fail(void) 15042df2e2SRuslan Ermilov { 16042df2e2SRuslan Ermilov 17042df2e2SRuslan Ermilov panic("stack overflow detected; backtrace may be corrupted"); 18042df2e2SRuslan Ermilov } 19042df2e2SRuslan Ermilov 20042df2e2SRuslan Ermilov static void 21042df2e2SRuslan Ermilov __stack_chk_init(void *dummy __unused) 22042df2e2SRuslan Ermilov { 23042df2e2SRuslan Ermilov size_t i; 24*708694f7SPedro F. Giffuni long guard[nitems(__stack_chk_guard)]; 25042df2e2SRuslan Ermilov 26042df2e2SRuslan Ermilov arc4rand(guard, sizeof(guard), 0); 27*708694f7SPedro F. Giffuni for (i = 0; i < nitems(guard); i++) 28042df2e2SRuslan Ermilov __stack_chk_guard[i] = guard[i]; 29042df2e2SRuslan Ermilov } 30e64585bdSRuslan Ermilov SYSINIT(stack_chk, SI_SUB_RANDOM, SI_ORDER_ANY, __stack_chk_init, NULL); 31