1#include <sys/cdefs.h> 2__FBSDID("$FreeBSD: releng/11.0/sys/kern/stack_protector.c 284462 2015-06-16 20:19:00Z pfg $"); 3 4#include <sys/types.h> 5#include <sys/param.h> 6#include <sys/kernel.h> 7#include <sys/systm.h> 8#include <sys/libkern.h> 9 10long __stack_chk_guard[8] = {}; 11void __stack_chk_fail(void); 12 13void 14__stack_chk_fail(void) 15{ 16 17 panic("stack overflow detected; backtrace may be corrupted"); 18} 19 20static void 21__stack_chk_init(void *dummy __unused) 22{ 23 size_t i; 24 long guard[nitems(__stack_chk_guard)]; 25 26 arc4rand(guard, sizeof(guard), 0); 27 for (i = 0; i < nitems(guard); i++) 28 __stack_chk_guard[i] = guard[i]; 29} 30SYSINIT(stack_chk, SI_SUB_RANDOM, SI_ORDER_ANY, __stack_chk_init, NULL); 31