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Stack analysis fails in delphi prologue

Aperta
#8,433 0 commenti 0 reazioni 0 assegnatari Vedi su GitHub

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Valutazione

Difficoltà
4/5
Tempo stimato
3-5 giorni
Idoneità per principianti
45/100
Tipo di issue
Bug
Chiarezza
Abbastanza chiara
Stato di attività
Tranquilla
Ambito
reverse-engineering

Direzione di ricerca

Reproduce the failure with the dogbolt corpus binary at 0x004180f4, then compare it with the existing support in commit 1f93de3128bc086aedc4c7f5580ab98632fef568. Read wf_delphi_intro.py to understand the attempted handling of the Delphi prologue and verify the behavior on the other occurrences described in the issue. Done means stack recovery works for this pattern without breaking similar prologues.

Scritto dal modello di indicizzazione a partire dal testo della issue.

Descrizione

Core: LLIL

Version and Platform (required):

  • Binary Ninja Version: 6.0.10489-dev
  • Edition: Ultimate
  • OS: macOS
  • OS Version: 26.6
  • CPU Architecture: arm64

Bug Description:
One of the common types of Delphi function prologue uses a loop to allocate a fixed amount of stack space, causing LLIL's stack recovery to break.

Steps To Reproduce:

  1. Open binary, dogbolt corpus sha256 60bdc2d5e9728214d5c5cf43e9abb62d62c0afbeecdc737a7f482e09b5c773e1
  2. Navigate to 0x004180f4
  3. Observe broken stack recovery

Expected Behavior:
I expected stack recovery to work

Screenshots/Video Recording:
Image
Image

Binary:
See dogbolt corpus 60bdc2d5e9728214d5c5cf43e9abb62d62c0afbeecdc737a7f482e09b5c773e1 or on internal slack under caesar_cipher.exe

Additional Information:
On public slack Michael F reported the same issue with a different (unknown) binary. The binary in this issue is compiled with Delphi ~2010 and uses this pattern in a number of places to set up a stack frame, and seems like it has the identical prologue and behavior.

We already have support for patterns nearly identical to this one, see Vector35/binaryninja@1f93de3128bc086aedc4c7f5580ab98632fef568, but due to this using x86's dec ecx causing a spill to a temporary register during the loop, this specific pattern is not handled.

I had Codex generate a workflow plugin that attempts to handle this case, which seems to work for exactly this function but unconfirmed in the general case. That is available here: wf_delphi_intro.py

Lingua principale
C++
Stelle
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Fork
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Merge medio
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PR unite (30g)
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