Quoting Oren Laadan (or...@cs.columbia.edu):
> +     ret = -EINVAL;
> +     if (hh->vdso != (unsigned long) mm->context.vdso)
> +             goto out;

We were just talking about vdso+s390 on irc this morning,
wondering about how to handle it...

Looking at arch/x86/vdso/vma.c, this seems like it should
pretty much always error out.  The vdso base is set as a
random offset above the stack base at exec().

-serge
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