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bogo / arm64-to-sim

Transmogrify native iOS frameworks to run in iOS Simulator on Apple silicon.
https://bogo.wtf/arm64-to-sim.html
MIT License
532 stars 86 forks source link

Fix overflow when serializing the `sectionType` #12

Closed jerrymarino closed 2 years ago

jerrymarino commented 2 years ago

The struct, section_64's field flags is a UInt32 and the current code can overflow because of the cast. Swift catches the runtime failure and crashes.

I have attached culprit object file's header info but can't reproduce or provide the object file which compiled on Xcode 12.1.

Some.o:
Load command 0
      cmd LC_SEGMENT_64
  cmdsize 1832
  segname
   vmaddr 0x0000000000000000
   vmsize 0x0000000000001135
  fileoff 2648
 filesize 4405
  maxprot 0x00000007
 initprot 0x00000007
   nsects 22
    flags 0x0
Load command 1
      cmd LC_VERSION_MIN_IPHONEOS
  cmdsize 16
  version 9.3
      sdk 14.1