disasm() doesn't work for context.arch='sparc64'

[meithecatte]

~$ python3
Python 3.8.3 (default, May 14 2020, 11:03:12)
[GCC 9.3.0] on linux
Type "help", "copyright", "credits" or "license" for more information.
>>> from pwn import *
>>> context(arch='sparc')
>>> asm('nop')
b'\x01\x00\x00\x00'
>>> disasm(_)
'   0:   01 00 00 00     nop'
>>>
~$ python3 - DEBUG
Python 3.8.3 (default, May 14 2020, 11:03:12)
[GCC 9.3.0] on linux
Type "help", "copyright", "credits" or "license" for more information.
>>> from pwn import *
>>> context(arch='sparc64')
>>> asm('nop')
[DEBUG] cpp -C -nostdinc -undef -P -I/home/kuba/.local/lib/python3.8/site-packages/pwnlib/data/includes /dev/stdin
[DEBUG] Assembling
    .section .shellcode,"awx"
    .global _start
    .global __start
    _start:
    __start:
    nop
[DEBUG] /usr/bin/sparc64-linux-gnu-as -EB -64 -o /tmp/pwn-asm-wq5065ol/step2 /tmp/pwn-asm-wq5065ol/step1
[DEBUG] /usr/bin/sparc64-linux-gnu-objcopy -j .shellcode -Obinary /tmp/pwn-asm-wq5065ol/step3 /tmp/pwn-asm-wq5065ol/step4
b'\x01\x00\x00\x00'
>>> disasm(_)
[DEBUG] /usr/bin/sparc64-linux-gnu-objcopy -I binary -O elf64-sparc -B sparc64 --set-section-flags .data=code --rename-section .data=.text -w -N * /tmp/pwn-disasm-0m495_e1/step1 /tmp/pwn-disasm-0m495_e1/step2
[ERROR] There was an error running ['/usr/bin/sparc64-linux-gnu-objcopy', '-I', 'binary', '-O', 'elf64-sparc', '-B', 'sparc64', '--set-section-flags', '.data=code', '--rename-section', '.data=.text', '-w', '-N', '*', '/tmp/pwn-disasm-0m495_e1/step1', '/tmp/pwn-disasm-0m495_e1/step2']:
    It had the exitcode 1.
    It had this on stdout:
    /usr/bin/sparc64-linux-gnu-objcopy: architecture sparc64 unknown

[ERROR] An error occurred while disassembling:
    b'\x01\x00\x00\x00'
    Traceback (most recent call last):
      File "/home/kuba/.local/lib/python3.8/site-packages/pwnlib/asm.py", line 785, in disasm
        _run(objcopy + [step1, step2])
      File "/home/kuba/.local/lib/python3.8/site-packages/pwnlib/asm.py", line 382, in _run
        log.error(msg)
      File "/home/kuba/.local/lib/python3.8/site-packages/pwnlib/log.py", line 417, in error
        raise PwnlibException(message % args)
    pwnlib.exception.PwnlibException: There was an error running ['/usr/bin/sparc64-linux-gnu-objcopy', '-I', 'binary', '-O', 'elf64-sparc', '-B', 'sparc64', '--set-section-flags', '.data=code', '--rename-section', '.data=.text', '-w', '-N', '*', '/tmp/pwn-disasm-0m495_e1/step1', '/tmp/pwn-disasm-0m495_e1/step2']:
    It had the exitcode 1.
    It had this on stdout:
    /usr/bin/sparc64-linux-gnu-objcopy: architecture sparc64 unknown

Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
  File "/home/kuba/.local/lib/python3.8/site-packages/pwnlib/context/__init__.py", line 1441, in setter
    return function(*a, **kw)
  File "/home/kuba/.local/lib/python3.8/site-packages/pwnlib/asm.py", line 795, in disasm
    log.exception("An error occurred while disassembling:\n%s" % data)
  File "/home/kuba/.local/lib/python3.8/site-packages/pwnlib/asm.py", line 785, in disasm
    _run(objcopy + [step1, step2])
  File "/home/kuba/.local/lib/python3.8/site-packages/pwnlib/asm.py", line 382, in _run
    log.error(msg)
  File "/home/kuba/.local/lib/python3.8/site-packages/pwnlib/log.py", line 417, in error
    raise PwnlibException(message % args)
pwnlib.exception.PwnlibException: There was an error running ['/usr/bin/sparc64-linux-gnu-objcopy', '-I', 'binary', '-O', 'elf64-sparc', '-B', 'sparc64', '--set-section-flags', '.data=code', '--rename-section', '.data=.text', '-w', '-N', '*', '/tmp/pwn-disasm-0m495_e1/step1', '/tmp/pwn-disasm-0m495_e1/step2']:
It had the exitcode 1.
It had this on stdout:
/usr/bin/sparc64-linux-gnu-objcopy: architecture sparc64 unknown


>>> pwnlib.version
'4.1.1'

[meithecatte]

mips64 and powerpc64 are also affected.

[meithecatte]

On Sun, Jun 07, 2020 at 12:14:40PM -0700, Zach Riggle wrote: I can't reproduce this. ``` >>> context.clear(arch='sparc64') >>> asm('nop') '\x01\x00\x00\x00' ``` ``` >>> context.clear(arch='mips64') >>> asm('nop') [!] Could not find system include headers for mips64-linux '\x00\x00\x00\x00' ``` ``` >>> context.clear(arch='powerpc64') >>> asm('nop') '`\x00\x00\x00' ```

Please note that the issue happens when calling `disasm`, not `asm`.

[meithecatte]

@zachriggle Bump. I think you closed this by mistake.

[zachriggle]

Yep not sure what happened. If you know why this is failing, a pull request would be nice!

[meithecatte]

Sorry, I didn't have the time to investigate this properly yet.

[heapcrash]

Can you take a look at #1603 and see if that fixes the issue for you?

[meithecatte]

I can confirm that it indeed made this work. The fix makes me wonder whether this will properly assemble for 64 bits, but I couldn't come up with a simple way to test this, so I will assume that this is handled by the bfd name.