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ASLR (Address Space Layout Randomization) is a form of data security used to randomize data on the Template:Wp to help prevent exploits from taking control of the system. It first appeared in Template:Wp.

Program and dyld

  • On program load, the address space offset of the program is randomized between 0x0 and 0x100000
  • It always falls on a 0x1000 page boundary
  • dyld is included in this sliding section


  • The system libraries are now stored in a big cache file, see
  • This address randomized at boot time, in many possible places, higher in the address space than the program
  • The functions retain a fixed offset to each other.

External Links