Thursday, August 11, 2011

Is this Mac OS X app compiled with ASLR?

To determine if an OS X Mach-o binary is compiled with ASLR, look for the Position Independent Executable (PIE) flag in the Mach header:
$ otool -hv MobileSafari 

Mach header
      magic cputype cpusubtype  caps    filetype ncmds sizeofcmds      flags
   MH_MAGIC     ARM         V7  0x00     EXECUTE    40       4560   NOUNDEFS DYLDLINK TWOLEVEL PIE

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