Import

code/Makefile

@@ -0,0 +1,9 @@
+.PHONY: all
+
+demo:
+	gcc -ggdb -fno-stack-protector -z execstack -z norelro -m32 -no-pie -mpreferred-stack-boundary=2 demo.c -o demo
+
+diy:
+	gcc -ggdb -fno-stack-protector -z execstack -z norelro -m32 -no-pie -mpreferred-stack-boundary=2 diy.c -o diy
+
+all:	demo diy

code/demo.c

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+#include <stdio.h>
+#include <string.h>
+#include <stdlib.h>
+
+int main(int argc, char * argv[]){
+    char buf[128];
+
+    if(argc == 1){
+        printf("Usage: %s argument\n", argv[0]);
+        exit(1);
+    }
+    strcpy(buf,argv[1]);
+    printf("%s", buf);
+
+    return 0;
+}

code/diy.c

@@ -0,0 +1,22 @@
+#include <stdio.h>
+#include <strings.h>
+
+void winner()
+{
+    printf("You win\n");
+}
+
+void whoareyou()
+{
+    char name[250];
+
+    printf("What's your name? ");
+    gets(name);
+    printf("\nHello, %s\n", name);
+}
+
+int main()
+{
+    whoareyou();
+    printf("You lose\n");
+}