qilingframework / qilingframework/qiling

Better VFS support

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Dominant language
Python
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Description

This PR is mostly for discussion as I draft this code

Is your feature request related to a problem? Please describe.
Recently I have come into Android/iOS emulation and I have identified shortcomings with the current VFS, particularly with fstatat and similar syscalls which fall back onto the physical filesystem.

Describe the solution you'd like
I'm looking into using PyFilesystem2 to fully replace the fs_mapper - one very neat advantage of this is having an overlay rootfs while being able to adapt Qiling to parse Android images (with APEX support) or Apple read-only filesystems.

Contributor guide

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First steps

  1. Read the whole issue, then the project's contributing guide.
  2. Comment on the issue to say you are picking it up — it saves two people doing the same work.
  3. Fork the repository and make your change on a branch.
  4. Open a pull request that references the issue number.

Research direction

Start by reviewing the current fs_mapper and the fstatat and similar syscall paths that fall back to the physical filesystem. Compare that design with PyFilesystem2 and determine the scope needed for an overlay rootfs plus Android APEX and Apple read-only filesystem support; done means the replacement design is agreed and those filesystem cases are supported.

Written by the indexing model from the issue text.

Assessment

Tech stack
python
Domain
operating-systems, reverse-engineering
Issue type
Feature
Difficulty
5/5
Estimated time
Over a week
Activity status
Quiet
Clarity
Needs clarification
Newbie friendliness
25/100

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