Added a challenge that might actually be impossible

Makefile

@@ -2,6 +2,7 @@ all:
 	g++ -I./ -g -o 1.bin -fstack-protector-all 1.cpp
 	g++ -I./ -g -o 2.bin -fstack-protector-all 2.cpp
 	g++ -I./ -g -o 3.bin -fstack-protector-all 3.cpp
-	g++-4.8 -I./ -g -o 4.bin -fsanitize=address 4.cpp
+	g++-4.8 -I./ -g -ftrapv -o 4.bin -fsanitize=address 4.cpp
+	g++-4.8 -I./ -g -ftrapv -o impossible.bin -ftrapv -fsanitize=address impossible.cpp
 clean:
 	rm -f *.bin *.o *.so *_expanded.cpp 

impossible.cpp

@@ -0,0 +1,42 @@
+#include <stdio.h>
+#include <stdlib.h>
+#include <signal.h>
+
+void handler(int sig)
+{
+	printf("nice try, must be less than 10...\n");
+}
+
+int a(){
+	long position = 0;
+	char in;
+    	char buff2[10] = "dir"; 
+	char buff[10];
+	printf("buff position: %p\n", buff);
+	printf("buff2 position: %p\n", buff2);
+	scanf("%ld", &position);
+	printf("position: %ld\n", position);
+	if(position < 0){
+		printf("nice try, must be more than 0...\n");
+		exit(1);	
+	}
+	position = position*2;
+	printf("position*2: %ld\n", position);
+	in = 0;
+	while(position < 10 && in != '\n'){
+		scanf("%c", &in);
+		buff[position] = in;
+		printf("%d\n", position);
+		position++;
+	} 
+	//scanf("%s", buff);
+	printf("buff: %s\n", buff);
+	printf("buff2: %s\n", buff2);
+	system(buff2);
+}
+
+int main(){
+	signal(SIGABRT, &handler);
+	a();
+	return 0;
+}