Linux-kernel mailing list archive 1999-37,: Re: only root has acces to /dev/mem ?

# Re: only root has acces to /dev/mem ?

Jamie Lokier (lkd@tantalophile.demon.co.uk)
Tue, 14 Sep 1999 22:54:56 +0200

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Alan Cox wrote:
> > Would it be ok to permit opening kmem read-only without raw I/O?
>
> Some devices can be triggered by read operations. Its probably ok for
> almost all cases though

I'd thought of that. I saw that kmem_read refuses to read above
high_memory. But you've reminded me that some ISA devices live in low
memory.

Perhaps kmem_read should only permit reading ordinary memory mappings?
I suggest device access should always go throw /dev/mem anyway.

-- Jamie

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