Create format1.c

Author: mzhang28

format1.c

@@ -0,0 +1,21 @@
+#include <stdio.h>
+#include <stdlib.h>
+#include <fcntl.h>
+
+int key = 0;
+
+void vuln(){
+    gid_t gid = getegid();
+    setresgid(gid, gid, gid);
+    system("/bin/sh -i");
+}
+
+int main(int argc, char **argv){
+    int *ptr = &key;
+    printf(argv[1]);
+
+    if (key > 9000){
+        vuln();
+    }
+    return 0;
+}