Re: [PATCH] x86: introduce /dev/mem restrictions with a config option

[H. Peter Anvin]

Arjan van de Ven wrote:
> On Thu, 31 Jan 2008 17:53:04 +0100 (CET)
> Jan Engelhardt <jengelh@xxxxxxxxxxxxxxx> wrote:
>
> > On Jan 30 2008 12:48, Arjan van de Ven wrote:
> > > Subject: [PATCH] x86: introduce /dev/mem restrictions with a config
> > > option
> > >
> > > This patch introduces a restriction on /dev/mem: Only non-memory can
> > > be read or written unless the newly introduced config option is set.
> > Would not it be nicer to add a /dev/pcimem that implements the given 
> > restrictive semantics?
> >
> > Maybe it's just wishful thinking, but I am dreaming of an
> > unprivileged X, and /dev/pcimem (owned by an 'x11' user or so) would
> > be a step in that direction.
>
> /dev/pcimem is wrong; X can use the exact bar in sysfs already.
> This is more for compatibility with legacy X

Legacy X, and non-BAR X memory (originally ISA, of course; now probably 
more often "stolen system memory").

	-hpa
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