1*a9643ea8Slogwang #include <sys/cdefs.h> 2*a9643ea8Slogwang __FBSDID("$FreeBSD$"); 3*a9643ea8Slogwang 4*a9643ea8Slogwang #include <sys/types.h> 5*a9643ea8Slogwang #include <sys/param.h> 6*a9643ea8Slogwang #include <sys/kernel.h> 7*a9643ea8Slogwang #include <sys/systm.h> 8*a9643ea8Slogwang #include <sys/libkern.h> 9*a9643ea8Slogwang 10*a9643ea8Slogwang long __stack_chk_guard[8] = {}; 11*a9643ea8Slogwang void __stack_chk_fail(void); 12*a9643ea8Slogwang 13*a9643ea8Slogwang void __stack_chk_fail(void)14*a9643ea8Slogwang__stack_chk_fail(void) 15*a9643ea8Slogwang { 16*a9643ea8Slogwang 17*a9643ea8Slogwang panic("stack overflow detected; backtrace may be corrupted"); 18*a9643ea8Slogwang } 19*a9643ea8Slogwang 20*a9643ea8Slogwang static void __stack_chk_init(void * dummy __unused)21*a9643ea8Slogwang__stack_chk_init(void *dummy __unused) 22*a9643ea8Slogwang { 23*a9643ea8Slogwang size_t i; 24*a9643ea8Slogwang long guard[nitems(__stack_chk_guard)]; 25*a9643ea8Slogwang 26*a9643ea8Slogwang arc4rand(guard, sizeof(guard), 0); 27*a9643ea8Slogwang for (i = 0; i < nitems(guard); i++) 28*a9643ea8Slogwang __stack_chk_guard[i] = guard[i]; 29*a9643ea8Slogwang } 30*a9643ea8Slogwang SYSINIT(stack_chk, SI_SUB_RANDOM, SI_ORDER_ANY, __stack_chk_init, NULL); 31