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49 lines
1.4 KiB
Python
49 lines
1.4 KiB
Python
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#!/usr/bin/env python
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"""A tool for looking for indirect jumps and calls in x86 binaries.
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Helpful to verify whether or not retpoline mitigations are catching
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all of the indirect branches in a binary and telling you which
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functions the remaining ones are in (assembly, etc).
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Depends on llvm-objdump being in your path and is tied to the
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dump format.
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"""
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import os
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import sys
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import re
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import subprocess
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import optparse
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# Look for indirect calls/jmps in a binary. re: (call|jmp).*\*
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def look_for_indirect(file):
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args = ['llvm-objdump']
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args.extend(["-d"])
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args.extend([file])
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p = subprocess.Popen(args=args, stdin=None, stderr=subprocess.PIPE, stdout=subprocess.PIPE)
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(stdout,stderr) = p.communicate()
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function = ""
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for line in stdout.splitlines():
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if line.startswith(' ') == False:
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function = line
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result = re.search('(call|jmp).*\*', line)
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if result != None:
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# TODO: Perhaps use cxxfilt to demangle functions?
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print function
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print line
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return
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def main(args):
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# No options currently other than the binary.
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parser = optparse.OptionParser("%prog [options] <binary>")
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(opts, args) = parser.parse_args(args)
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if len(args) != 2:
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parser.error("invalid number of arguments: %s" % len(args))
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look_for_indirect(args[1])
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if __name__ == '__main__':
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main(sys.argv)
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