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

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Message-ID: <CAKv+Gu_xB2XywijC0VMY48uR212pOnm7dFzOAp2ozevHC7fRSA@mail.gmail.com>
Date:   Wed, 17 Jan 2018 12:01:01 +0000
From:   Ard Biesheuvel <ard.biesheuvel@...aro.org>
To:     Will Deacon <will.deacon@....com>
Cc:     Mark Rutland <mark.rutland@....com>,
        linux-arm-kernel <linux-arm-kernel@...ts.infradead.org>,
        linux-efi@...r.kernel.org,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] efi/arm*: Only register page tables when they exist

On 17 January 2018 at 10:19, Will Deacon <will.deacon@....com> wrote:
> 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?
>

I'll see if I can manage applying it.

-- 
Ard.