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Tools: scripts: Add PIE support in firmware_version_decoder

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Calculate pointer offset for PIE (Position Independent Executables) binaries.

Signed-off-by: Patrick José Pereira <patrickelectric@gmail.com>
This commit is contained in:
Patrick José Pereira 2021-08-25 15:14:41 -04:00 committed by Andrew Tridgell
parent bcfb07b39f
commit 47d2021780
1 changed files with 9 additions and 2 deletions
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9
Tools/scripts/firmware_version_decoder.py
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@ -6,6 +6,7 @@ import sys
import struct
from argparse import ArgumentParser
from dataclasses import dataclass
from elftools.elf.elffile import ELFFile
from typing import Any
@ -137,6 +138,7 @@ class Decoder:
self.fwversion = FWVersion()
self.byteorder = ""
self.pointer_size = 0
self.elffile = None
def unpack(self, struct_format: str) -> Any:
struct_format = f"{self.byteorder}{struct_format}"
@ -151,6 +153,9 @@ class Decoder:
if address == 0:
return ""
# Calculate address offset for PIE (Position Independent Executables) binaries
address = next(self.elffile.address_offsets(address))
current_address = self.bytesio.seek(0, io.SEEK_CUR)
self.bytesio.seek(address)
string = []
@ -193,8 +198,10 @@ class Decoder:
self.fwversion.os_hash_string = self.unpack_string_from_pointer()
def process(self, filename) -> None:
with open(filename, "rb") as file:
# We need the file open for ELFFile
file = open(filename, "rb")
data = file.read()
self.elffile = ELFFile(file)
if not data:
raise RuntimeError("Failed to find FWVersion.")