1180012Sru#include <sys/cdefs.h> 2180012Sru__FBSDID("$FreeBSD$"); 3180012Sru 4180012Sru#include <sys/types.h> 5180012Sru#include <sys/param.h> 6180012Sru#include <sys/kernel.h> 7180012Sru#include <sys/systm.h> 8180012Sru#include <sys/libkern.h> 9180012Sru 10180012Srulong __stack_chk_guard[8] = {}; 11180012Sruvoid __stack_chk_fail(void); 12180012Sru 13180012Sruvoid 14180012Sru__stack_chk_fail(void) 15180012Sru{ 16180012Sru 17180012Sru panic("stack overflow detected; backtrace may be corrupted"); 18180012Sru} 19180012Sru 20180012Srustatic void 21180012Sru__stack_chk_init(void *dummy __unused) 22180012Sru{ 23180012Sru size_t i; 24284462Spfg long guard[nitems(__stack_chk_guard)]; 25180012Sru 26180012Sru arc4rand(guard, sizeof(guard), 0); 27284462Spfg for (i = 0; i < nitems(guard); i++) 28180012Sru __stack_chk_guard[i] = guard[i]; 29180012Sru} 30198295SruSYSINIT(stack_chk, SI_SUB_RANDOM, SI_ORDER_ANY, __stack_chk_init, NULL); 31