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pushstr_array.asm
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pushstr_array.asm
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<% from pwnlib.shellcraft import amd64, pretty %>
<%docstring>
Pushes an array/envp-style array of pointers onto the stack.
Arguments:
reg(str):
Destination register to hold the pointer.
array(str,list):
Single argument or list of arguments to push.
NULL termination is normalized so that each argument
ends with exactly one NULL byte.
</%docstring>
<%page args="reg, array"/>
<%
if isinstance(array, (str)):
array = [array]
array_str = ''
# Normalize all of the arguments' endings
array = [arg.rstrip('\x00') + '\x00' for arg in array]
array_str = ''.join(array)
word_size = 8
offset = len(array_str) + word_size
%>\
/* push argument array ${pretty(array, False)} */
${amd64.pushstr(array_str)}
${amd64.mov(reg, 0)}
push ${reg} /* null terminate */
% for i,arg in enumerate(reversed(array)):
${amd64.mov(reg, offset + word_size*i - len(arg))}
add ${reg}, rsp
push ${reg} /* ${pretty(arg, False)} */
<% offset -= len(arg) %>\
% endfor
${amd64.mov(reg,'rsp')}