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Add fuzz stm32f407_hacklock example #1108

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@kabeor kabeor commented Mar 7, 2022

Checklist

Which kind of PR do you create?

  • This PR only contains minor fixes.
  • This PR contains major feature update.
  • This PR introduces a new function/api for Qiling Framework.

Coding convention?

  • The new code conforms to Qiling Framework naming convention.
  • The imports are arranged properly.
  • Essential comments are added.
  • The reference of the new code is pointed out.

Extra tests?

  • No extra tests are needed for this PR.
  • I have added enough tests for this PR.
  • Tests will be added after some discussion and review.

Changelog?

  • This PR doesn't need to update Changelog.
  • Changelog will be updated after some proper review.
  • Changelog has been updated in my PR.

Target branch?

  • The target branch is dev branch.

One last thing


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@elicn elicn left a comment

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A good example has to be minimalistic [to avoid confusion] and descriptive [to let people learn from it]. Please comment the example as much as you can and clean up residuals or unnecessary code.

from qiling.arch.arm import QlArchARM


def watch(ql:Qiling):
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The usage of this function is commented out.
Consider commenting out the function as well, or remove it altogether.


def watch(ql:Qiling):
r0 = hex(ql.arch.regs.read('r0'))
if r0 != '0x0':
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@elicn elicn Mar 9, 2022

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Why comparing strings when you can compare integers..?

ql.emu_stop()

def fuzz_cb(ql:Qiling):
if isinstance(ql.arch, QlArchARM):
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Could use ql.ostype to determine this, or just hasattr(ql.arch, 'effective_pc') if you want to avoid the extra import.

ql.hw.create('usart1')
ql.hw.create('rcc')

# ql.hw.show_info()
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Remove unnecessary leftovers to keep the example as clear as possible.

# ql.hw.show_info()
# ql.hook_address(watch, 0x08003232)

ql.patch(0x8000238, b'\x00\xBF' * 4)
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@elicn elicn Mar 9, 2022

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What is that..? What are we patching here and why?
Comments are critical for users to understand the example.


def disasm(count, ql, address, size):
buf = ql.mem.read(address, size)
try:
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Unnecessary try / exept.
There is nothing to catch here really.

buf = ql.mem.read(address, size)
try:
for i in md.disasm(buf, address):
return "{:08X}\t{:08X}: {:24s} {:10s} {:16s}".format(count[0], i.address, spaced_hex(buf), i.mnemonic,
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The loop doesn't make much sense if you return unconditionally.
Perhaps you mean yield..?

rtn = '{:100s}'.format(disasm(count, ql, address, size))
print(rtn)
count[0] += 1
# pass
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Clean up here too

# ql.run(end=0x8003236, count=-1)
ql.run(end=0x080031DC)

exits = [0x08003270, 0x08003222]
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Comments?
No idea what this is about.

examples/fuzzing/stm32f407/fuzz_stm32f407.sh Outdated Show resolved Hide resolved
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kabeor commented Mar 9, 2022

@elicn This example is an experimental test yet and depending on some unpublished interface, converting it to draft for now.

@kabeor kabeor marked this pull request as draft March 9, 2022 09:42
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2 participants