On Fri, 23 Jun 2006, Arjan van de Ven wrote:
>
> >
> > hi,
> >
> > So if i create a PROT_WRITE only mapping and then read from first and then
> > writte to it a get a SEGV. However, if i write to it first and then read
> > from it, i don't get a SEGV...Why should the read/write ordering matter?
>
> it matters only on those cpus that don't have explicit/separate read
> permissions (just like PROT_EXEC is implied on cpus that don't have a
> special permission bit for that)...
>
>
>
i understand that, but i'd like to see it changed so that i don't get a
SEGV when i read first on those cpus. The current behavior, besides being
inconsistent, is rather confusing...in addition, if ptes are copied
instead of faulted i get yet another type of behavior...
-Jason
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