Re: [PATCH] Fix devmem_is_allowed for below 1MB accesses for an efi machine

[Randy Wright]

On 10/02/2012 11:20 PM, Matthew Garrett wrote:

> Oh, right, got you. In that case I think we potentially need a 
> finer-grained check on EFI platforms - the EFI memory map is kind enough 
> to tell us the difference between unusable regions and io regions, and 
> we could avoid access to the unusable ones.


I wanted to mention in this context a patch RFC I posted yesterday as a
distinct thread which is visible as https://lkml.org/lkml/2012/10/3/589
with the subject: [PATCH RFC] function probe_roms accessing improper
addresses on UEFI systems.

While the mechanism is different from Tmac's patch (because probe_roms
runs early in boot, prior to resource structure initialization) the
intent of the change is the same: to prevent a machine check resulting
from access to inappropriate physical addresses.

I will monitor both this thread as well as my own recent RFC posting
since the underlying issues are common.

-- 
Randy Wright        <rwright@xxxxxx>        +1-970-898-0998
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