Re: Bug: fio traps into kernel without exiting because futex has adeadloop

[Peter Zijlstra]

On Mon, 2009-06-15 at 14:03 +0800, Zhang, Yanmin wrote:
> > +     ret = get_user_writeable(uaddr);
> X86 pte entry has no READABLE flag. Other platforms might have. If their pte
> only set WRITE flag, Is it poosible to create a similiar DOS attack with
> WRITEONLY area on such platforms?

I just checked a few such platforms and generic code, we seem to assume
read on write, and read when present in the generic code.

And those few platforms that supported wr-only also implemented that
(alpha, avr32 -- there might be more didn't go through all).



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