linux-kernel - Re: [PATCH] efi/arm*: Only register page tables when they exist

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Message-ID: <20180117101922.GB27892@arm.com>
Date:   Wed, 17 Jan 2018 10:19:23 +0000
From:   Will Deacon <will.deacon@....com>
To:     Mark Rutland <mark.rutland@....com>
Cc:     ard.biesheuvel@...aro.org, linux-arm-kernel@...ts.infradead.org,
        linux-efi@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] efi/arm*: Only register page tables when they exist

On Tue, Jan 16, 2018 at 02:08:32PM +0000, Mark Rutland wrote:
> Currently the arm/arm64 runtime code registers the runtime servies
> pagetables with ptdump regardless of whether runtime services page
> tables have been created.
> 
> As efi_mm.pgd is NULL in these cases, attempting to dump the efi page
> tables results in a NULL pointer dereference in the ptdump code:

Acked-by: Will Deacon <will.deacon@....com>

Ard -- please can you pick this one up?

Cheers,

Will