Re: [PATCH] powerpc/mm/32s: only use MMU to mark initmem NX if STRICT_KERNEL_RWX

From: christophe leroy
Date: Sun Jun 16 2019 - 04:26:38 EST

Le 15/06/2019 Ã 16:36, Andreas Schwab a ÃcritÂ:
On Jun 15 2019, Christophe Leroy <christophe.leroy@xxxxxx> wrote:

Andreas Schwab <schwab@xxxxxxxxxxxxxx> a ÃcritÂ:

If STRICT_KERNEL_RWX is disabled, never use the MMU to mark initmen

I dont understand, can you elaborate ?

It breaks suspend.

Ok, but we need to explain why it breaks suspend, and again your patch is wrong anyway because that area of memory is mapped with BATs so you can't use change_page_attr()

This area is mapped with BATs so using change_page_attr() is pointless.

There must be a reason STRICT_KERNEL_RWX is not available with

Yes but HIBERNATE and suspend are not the same thing. I guess HIBERNATE is not available with STRICT_KERNEL_RWX because HIBERNATE have to write back saved state into read-only memory as well.


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