ld.so: before and after

• before:

      /* set the GOT to RW */
      sigprocmask(SIG_BLOCK, &allsigs, &savedmask);
      spinlock_lock(&bind_lock);                /* libpthread cb */
      mprotect(object->got_start, object->got_size, PROT_READ|PROT_WRITE);

      *(Elf_Addr *)addr = newval;

      /* put the GOT back to RO */
      mprotect(object->got_start, object->got_size, PROT_READ);
      spinlock_unlock(&bind_lock);              /* libpthread cb */
      sigprocmask(SIG_SETMASK, &curset, NULL);

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