#include <sys/cdefs.h> __FBSDID("$FreeBSD$"); #include <sys/types.h> #include <sys/param.h> #include <sys/kernel.h> #include <sys/systm.h> #include <sys/libkern.h> long __stack_chk_guard[8] = {}; void __stack_chk_fail(void); void __stack_chk_fail(void) { panic("stack overflow detected; backtrace may be corrupted"); } static void __stack_chk_init(void *dummy __unused) { size_t i; long guard[nitems(__stack_chk_guard)]; arc4rand(guard, sizeof(guard), 0); for (i = 0; i < nitems(guard); i++) __stack_chk_guard[i] = guard[i]; } SYSINIT(stack_chk, SI_SUB_RANDOM, SI_ORDER_ANY, __stack_chk_init, NULL); |