Support for -fstack-protector

src/_win/cookie.c

@@ -0,0 +1,15 @@
+
+u64 __security_cookie;
+
+void __security_init_cookie() {
+    // They say it's a random number so I generated
+    // one using numbergenerator.org
+    __security_cookie = 0xb26e04cc62ba48a;
+}
+
+void __security_check_cookie(u64 retrieved) {
+    if(__security_cookie != retrieved) {
+        printf("Bro you've got a buffer overrun\n");
+        abort();
+    }
+}

src/_win/entry.c

@@ -12,6 +12,7 @@ _Noreturn void mainCRTStartup() {
     _setup_heap();
     _setup_timer();
     _setup_io();
+    __security_init_cookie();
 
     srand(0);
     setlocale(LC_ALL, "C");
@@ -28,6 +29,7 @@ _Noreturn void WinMainCRTStartup() {
     _setup_heap();
     _setup_timer();
     _setup_io();
+    __security_init_cookie();
 
     srand(0);
     setlocale(LC_ALL, "C");

src/_win/win.h

@@ -12,3 +12,4 @@ void _setup_eh();
 void _setup_heap();
 void _setup_io();
 void _close_io();
+void __security_init_cookie();

src/ciabatta.c

@@ -66,6 +66,7 @@
 // Windows stuff
 #if defined(CIABATTA_WIN)
     #include "_win/win.h"
+    #include "_win/cookie.c"
     #include "_win/assert.c"
     #include "_win/cmdline.c"
     #include "_win/entry.c"

test.cmd

@@ -1,2 +1,2 @@
 
-clang -std=c11 test\%1 utf8.obj -Iinc -g -lciabatta.lib -nostdlib
+clang -std=c11 test\%1 utf8.obj -Iinc -g -lciabatta.lib -nostdlib -fstack-protector

test/alloca.c

@@ -0,0 +1,10 @@
+#include <stdio.h>
+#include <stdint.h>
+int main() {
+    uint8_t *sp = _alloca(512);
+    for(int i = 0; i != 550; ++i) {
+        sp[i] = 0;
+    }
+    printf("%p\n", sp);
+    return 0;
+}

test/helloworld.c

@@ -0,0 +1,7 @@
+
+#include <stdio.h>
+
+int main() {
+    printf("Hello, World!\n");
+    return 0;
+}