First Ret2Win Added

Week2_IntroToOverflows/Makefile

@@ -0,0 +1,13 @@
+# Build the first overflow target
+
+CC = gcc
+CFLAGS = -m32 -g -z execstack
+
+
+ret2winOne: ret2winOne.c
+
+	$(CC) $(CFLAGS) ret2winOne.c -o ret2winOne
+
+
+all: ret2winOne
+

Week2_IntroToOverflows/ret2winOne.c

@@ -0,0 +1,43 @@
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <unistd.h>
+
+int BUFFER=150;
+
+void win(void){
+    /*Win Condition
+      We Want to jump here
+    */
+    printf("\n ===== Win ===== \n\n");
+    system("/bin/sh");  //Tradition to get a shell
+}
+
+void lose(void){
+    /* Lose Condition */
+    printf("Current Memory Address is %p\n",lose);
+    printf("Aim for %p\n", win);    
+    printf("Lose :(\n");
+}
+
+int main(int argc, char* argv[]){
+    /* Main Function*/
+
+    //Pointer to the lose function
+    void (*fp)(void) = lose;
+
+    char buffer[BUFFER];
+    printf("Overflow the Buffer\n");
+
+    if (argc != 2){
+	printf("Overflow the buffer\n");
+	printf("Hint! Try `python -c \"print 'A'*100\"`\n");
+	return -1;
+    }
+
+    memcpy(buffer, argv[1], strlen(argv[1]));
+    printf("Off to %p\n",fp);
+    fp();
+
+    return 0;
+}