Method read

pwnlib/elf/elf.py:1416–1530

r"""read(address, count) -> bytes Read data from the specified virtual address Arguments: address(int): Virtual address to read count(int): Number of bytes to read Returns: A :class:`bytes` object, or :const:`None`. Examples:

(self, address, count)

            return segment.header.p_offset + offset

    def read(self, address, count):
        r"""read(address, count) -> bytes

        Read data from the specified virtual address

        Arguments:
            address(int): Virtual address to read
            count(int): Number of bytes to read

        Returns:
            A :class:`bytes` object, or :const:`None`.

        Examples:
            The simplest example is just to read the ELF header.

            >>> bash = ELF(which('bash'))
            >>> bash.read(bash.address, 4)
            b'\x7fELF'

            ELF segments do not have to contain all of the data on-disk
            that gets loaded into memory.

            First, let's create an ELF file has some code in two sections.

            >>> assembly = '''
            ... .section .A,"awx"
            ... .global A
            ... A: nop
            ... .section .B,"awx"
            ... .global B
            ... B: int3
            ... '''
            >>> e = ELF.from_assembly(assembly, vma=False)

            By default, these come right after eachother in memory.

            >>> e.read(e.symbols.A, 2)
            b'\x90\xcc'
            >>> e.symbols.B - e.symbols.A
            1

            Let's move the sections so that B is a little bit further away.

            >>> objcopy = pwnlib.asm._objcopy()
            >>> objcopy += [
            ...     '--change-section-vma', '.B+5',
            ...     '--change-section-lma', '.B+5',
            ...     e.path
            ... ]
            >>> subprocess.check_call(objcopy)
            0

            Now let's re-load the ELF, and check again

            >>> e = ELF(e.path)
            >>> e.symbols.B - e.symbols.A
            6
            >>> e.read(e.symbols.A, 2)