linux-kernel - Re: [PATCH v7 4/7] mseal, system mappings: enable arm64

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Message-ID: <CABi2SkX0oGnqM4BDfRt0+7Pcf31td8np3=dVg1ixcaDNoUyHkQ@mail.gmail.com>
Date: Tue, 25 Feb 2025 14:26:50 -0800
From: Jeff Xu <jeffxu@...omium.org>
To: Lorenzo Stoakes <lorenzo.stoakes@...cle.com>
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Subject: Re: [PATCH v7 4/7] mseal, system mappings: enable arm64

On Mon, Feb 24, 2025 at 10:20 PM Lorenzo Stoakes
<lorenzo.stoakes@...cle.com> wrote:
>
> On Mon, Feb 24, 2025 at 10:52:43PM +0000, jeffxu@...omium.org wrote:
> > From: Jeff Xu <jeffxu@...omium.org>
> >
> > Provide support for CONFIG_MSEAL_SYSTEM_MAPPINGS on arm64, covering
> > the vdso, vvar, and compat-mode vectors and sigpage mappings.
> >
> > Production release testing passes on Android and Chrome OS.
>
> This is pretty limited (yes yes I know android is massive etc. but we must
> account for all the weird and wonderful arm64 devices out there in context of
> upstream :)
>
> Have you looking through all arm64-code relating to vdso, vvar, compat-mode
> vectors, sigpage mapping and ensured nothing kernel-side relies upon relocation?
> Some arches actually seem to want to do this. Pretty sure PPC does... so a bit
> nervous of that.
>
Can you please point out where PPC munmap/mremap the vdso ?

Previously, when you mentioned that, I thought you meant user space in
PPC, I didn't realize that you meant that kernel code in PPC.  I
tried, but didn't find anything, hence asking.

Thanks.
-Jeff