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    SubjectRe: [Patch 0/2] powerpc: avoid userspace poking to legacy ioports
    On Mon, 18 Feb 2008 21:58:42 +0100
    Jean Delvare <khali@linux-fr.org> wrote:

    > On Tue, 19 Feb 2008 07:42:03 +1100, Benjamin Herrenschmidt wrote:
    > >
    > > > Maybe Christian's patch can be improved to not do the check on
    > > > these? As long as /dev/port exists, it seems reasonable that the
    > > > kernel should behave, no matter what I/O ports are accessed from
    > > > user-space.
    > >
    > > nonsense.
    > >
    > > /dev/mem exists for example, but you are still not supposed to go
    > > bang all over the place in it.
    >
    > You should at least be able to read from it without crashing the
    > machine. Of course writing is a different story.

    keep dreaming. This is not how /dev/mem works today, not on x86 and very likely not on ppc either.



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