Re: [PATCH] x86: add phys addr validity check for /dev/mem mmap

[Oleg Nesterov]

On 04/02, Frantisek Hrbata wrote:
>
> Meaning there is a possibility to use mmap
> on /dev/mem and cause system panic. It's probably not that serious, because
> access to /dev/mem is limited and the system has to have panic_on_oops set, but
> still I think we should check this and return error.

Personally I agree. Even if panic_on_oops == F, do_page_fault(PF_RSVD) leading
to pgtable_bad() doesn't look good.

Oleg.

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