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 #if defined(__SSP__) || defined(__SSP_ALL__) 11042df2e2SRuslan Ermilov long __stack_chk_guard[8] = {}; 12042df2e2SRuslan Ermilov void __stack_chk_fail(void); 13042df2e2SRuslan Ermilov 14042df2e2SRuslan Ermilov void 15042df2e2SRuslan Ermilov __stack_chk_fail(void) 16042df2e2SRuslan Ermilov { 17042df2e2SRuslan Ermilov 18042df2e2SRuslan Ermilov panic("stack overflow detected; backtrace may be corrupted"); 19042df2e2SRuslan Ermilov } 20042df2e2SRuslan Ermilov 21042df2e2SRuslan Ermilov #define __arraycount(__x) (sizeof(__x) / sizeof(__x[0])) 22042df2e2SRuslan Ermilov static void 23042df2e2SRuslan Ermilov __stack_chk_init(void *dummy __unused) 24042df2e2SRuslan Ermilov { 25042df2e2SRuslan Ermilov size_t i; 26042df2e2SRuslan Ermilov long guard[__arraycount(__stack_chk_guard)]; 27042df2e2SRuslan Ermilov 28042df2e2SRuslan Ermilov arc4rand(guard, sizeof(guard), 0); 29042df2e2SRuslan Ermilov for (i = 0; i < __arraycount(guard); i++) 30042df2e2SRuslan Ermilov __stack_chk_guard[i] = guard[i]; 31042df2e2SRuslan Ermilov } 32042df2e2SRuslan Ermilov /* SI_SUB_EVENTHANDLER is right after SI_SUB_LOCK used by arc4rand() init. */ 33042df2e2SRuslan Ermilov SYSINIT(stack_chk, SI_SUB_EVENTHANDLER, SI_ORDER_ANY, __stack_chk_init, NULL); 34042df2e2SRuslan Ermilov 35042df2e2SRuslan Ermilov #endif 36