linux-kernel - Re: [RFC PATCH v3 00/15] pkeys-based page table hardening

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Message-ID: <c16a24b9-1258-4976-827d-db3335bf6e83@arm.com>
Date: Thu, 13 Feb 2025 15:54:40 +0100
From: Kevin Brodsky <kevin.brodsky@....com>
To: Kees Cook <kees@...nel.org>
Cc: linux-hardening@...r.kernel.org, linux-kernel@...r.kernel.org,
 Andrew Morton <akpm@...ux-foundation.org>, Mark Brown <broonie@...nel.org>,
 Catalin Marinas <catalin.marinas@....com>,
 Dave Hansen <dave.hansen@...ux.intel.com>, Jann Horn <jannh@...gle.com>,
 Jeff Xu <jeffxu@...omium.org>, Joey Gouly <joey.gouly@....com>,
 Linus Walleij <linus.walleij@...aro.org>, Andy Lutomirski <luto@...nel.org>,
 Marc Zyngier <maz@...nel.org>, Peter Zijlstra <peterz@...radead.org>,
 Pierre Langlois <pierre.langlois@....com>,
 Quentin Perret <qperret@...gle.com>, "Mike Rapoport (IBM)"
 <rppt@...nel.org>, Ryan Roberts <ryan.roberts@....com>,
 Thomas Gleixner <tglx@...utronix.de>, Will Deacon <will@...nel.org>,
 Matthew Wilcox <willy@...radead.org>, Qi Zheng <zhengqi.arch@...edance.com>,
 linux-arm-kernel@...ts.infradead.org, linux-mm@...ck.org, x86@...nel.org
Subject: Re: [RFC PATCH v3 00/15] pkeys-based page table hardening

On 10/02/2025 15:23, Kevin Brodsky wrote:
> [...]
>
>>> Any comment or feedback will be highly appreciated, be it on the
>>> high-level approach or implementation choices!
>> As hinted earlier with my QEMU question... what's the best way I can I
>> test this myself? :)
> As mentioned above I tested this series on Arm FVP. By far the easiest
> way to run some custom kernel/rootfs on FVP is to use the Shrinkwrap
> tool [3]. First install it following the quick start guide [4] (I would
> recommend using the Docker backend if possible). Then build the firmware
> stack using:
>
> $ shrinkwrap build -o arch/v9.0.yaml ns-edk2.yaml
>
> To make things easy, the runtime configuration can be stored in a file.
> Create ~/.shrinkwrap/config/poe.yaml with the following contents:
>
> ----8<----
>
> %YAML 1.2
> ---
> layers:
>   - arch/v9.0.yaml

Apologies, this is incorrect - it will not work with the most recent FVP
builds. POE is a v9.4 feature so this line should be replaced with:

> - arch/v9.4.yaml

(No need to change the shrinkwrap build line, it only matters for the
FVP runtime parameters.)

- Kevin

> run:
>   rtvars:
>     CMDLINE:
>       type: string
>       # nr_cpus=1 can be added to speed up the boot
>       value: console=ttyAMA0 earlycon=pl011,0x1c090000 root=/dev/vda rw
>   params:
>     -C cluster0.has_permission_overlay_s1: 1
>     -C cluster1.has_permission_overlay_s1: 1
>
> ----8<----
>
> Finally start FVP using:
>
> $ shrinkwrap run -o poe.yaml ns-edk2.yaml -r
> KERNEL=<out>/arch/arm64/boot/Image -r ROOTFS=<rootfs.img>
>
> (Use Ctrl-] to terminate the model if needed.)
>
> <rootfs.img> is a file containing the root filesystem (in raw format,
> e.g. ext4). The kernel itself is built as usual (defconfig works just
> fine), just make sure to select CONFIG_KPKEYS_HARDENED_PGTABLES to
> enable the feature. You can also select
> CONFIG_KPKEYS_HARDENED_PGTABLES_TEST to run the tests in patch 15.