Lazy binding (threaded)

• Lazy binding code:

  • resolve symbol to correct address

  • block all signals with sigprocmask()

  • grab bind spinlock

  • mprotect() the GOT to read-write

  • update GOT or PLT entry

  • mprotect() the GOT read-only again

  • release bind spinlock

  • restore signal mask with sigprocmask()