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Shared cache loading fails to recognize CFString / NSString literals #6122

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bdash opened this issue Nov 12, 2024 · 0 comments
Open

Shared cache loading fails to recognize CFString / NSString literals #6122

bdash opened this issue Nov 12, 2024 · 0 comments

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@bdash
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bdash commented Nov 12, 2024

Version and Platform (required):

  • Binary Ninja Version: 4.2.6406-dev Personal (7c9db0b0)
  • OS: macOS
  • OS Version: 15.1
  • CPU Architecture: arm64

Bug Description:
When opening a macOS dyld shared cache and loading a library that uses CFString or NSString literals, Binary Ninja often leaves references to them as opaque data_1e6b5cdb8 references. The data within the __cfstring section does not have its type set to struct __NSConstantString and is not renamed to a descriptive name.

These steps are done when loading an executable from the file system.

Steps To Reproduce:

  1. Open /System/Cryptexes/OS/System/Library/dyld/dyld_shared_cache_arm64e
  2. Load AppKit.framework
  3. Wait patiently
  4. Search for _systemInformationRequested in the symbol list.

Expected Behavior:

  1. The reference to the string literal should be named to provide some hint as to its contents (com.apple.SystemProfiler) rather than an opaque data_ reference.
  2. The referenced data should have its type set to struct __NSConstantString.

For executables loaded from the file system rather than the shared cache, this reference typically would have been renamed to something like cfstr_com_apple_SystemProfiler.

Screenshots/Video Recording:
Reference from code:
Screenshot 2024-11-12 at 13 00 25

Lack of type of data within __cfstring section:
Screenshot 2024-11-12 at 13 01 17

Expected behavior (from an executable on disk, rather than a framework in the shared cache):
Screenshot 2024-11-12 at 13 02 03
Screenshot 2024-11-12 at 13 02 39

Binary:
See steps to reproduce.

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