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Bitfield pointers don't render correctly

Aperta
#8,408 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
52/100
Tipo di issue
Bug
Chiarezza
Abbastanza chiara
Stato di attività
Tranquilla
Stack tecnologico
cpp
Ambito
reverse-engineering

Direzione di ricerca

Start with StructureMemberLinearViewObject's bitfield-member rendering and compare it with the DataRendererContainer::RenderObjectForData path used by other structure members. Then trace the pointer renderer's handling of bitfield length and the __based pointer; done means the reproduced struct renders foo using its 0x1234 base without consuming bits belonging to bar.

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

Descrizione

Version and Platform (required):

  • Binary Ninja Version: based on 5.4.10248
  • Edition: Ultimate
  • OS: macOS
  • OS Version: 26.6
  • CPU Architecture: arm64

Bug Description:
When a pointer type is rendered as part of a bitfield structure member, the pointer data renderer is not invoked and details like the pointer base is not handled.

Steps To Reproduce:
Please provide all steps required to reproduce the behavior:

  1. Open a new file, enter in bytes 10 00
  2. Create a type with the following signature:
struct struct_1 __packed
{
    void* __ptr16 __based(const, 0x1234) foo : 12;
    int16_t bar : 4;
};
  1. Apply the struct_1 type to the first byte of the binary
  2. Observe the foo member is not rebased as you defined

Expected Behavior:
I expected my pointer base to apply when rendering pointers.

Screenshots/Video Recording:
Image

Additional Information:
This is because StructureMemberLinearViewObject has dedicated behavior for rendering bitfield structure members, and that does not invoke the DataRendererContainer::RenderObjectForData as it does for all other structure members. Even if this were changed, the pointer renderer would need to understand the bitfield length of the member it is rendering, so it does not read the bits shared with other members in the bytes of the rendered member.

Lingua principale
C++
Stelle
1.3k
Fork
298
Merge medio
4g 13h
PR unite (30g)
20

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