如何在python中用\\x00填充地址

Question

I am trying to print the address 0x004007ad to the terminal for the purposes of a buffer overflow assignment. I have to do it in little endian because of my processor. However when I try print the address the \\x00 is not being included. Below is the code for my python program:

hex_string = "\xad\x07\x40\x00"
print "\x01" * 28 + hex_string

How can I print it so that the \\x00 is included?

Answer 1

escape all of your backslashes by putting another backslash in front of them...

hex_string = "\\xad\\x07\\x40\\x00"
print "\x01" * 28 + hex_string

that should do the trick!

EDIT: regarding your question...

import re
hex_string = "\\xad\\x07\\x40\\x00"
other_string = 28*"\\x01"
hex_string = re.sub("\\\\", "", hex_string)
other_string = re.sub("\\\\", "", other_string)
print(other_string + hex_string)

gives...

Answer 2

Not sure if I'm answering too late.

My understanding is you got a string buffer of raw address and you want to dump it in human convention to stdout.

Unfortunately python doesn't have very good handling of hex formatting. One way of doing it is to convert the raw value into proper Python int and formatting it using %x and manually prepend 0x at the front.

Sample code follows

import struct
hex_string = "\xad\x07\x40\x00"
v, = struct.unpack('<I', hex_string)
print ('0x' + '%08x' % v)