linux-hardening - Re: [PATCH v3 00/24] x86_64: Improvements at compressed kernel stage

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Date:   Tue, 13 Dec 2022 13:03:17 -0500
From:   Peter Jones <pjones@...hat.com>
To:     Evgeniy Baskov <baskov@...ras.ru>
Cc:     Ard Biesheuvel <ardb@...nel.org>, Borislav Petkov <bp@...en8.de>,
        Andy Lutomirski <luto@...nel.org>,
        Dave Hansen <dave.hansen@...ux.intel.com>,
        Ingo Molnar <mingo@...hat.com>,
        Peter Zijlstra <peterz@...radead.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        Alexey Khoroshilov <khoroshilov@...ras.ru>,
        "Limonciello, Mario" <mario.limonciello@....com>,
        joeyli <jlee@...e.com>, lvc-project@...uxtesting.org,
        x86@...nel.org, linux-efi@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-hardening@...r.kernel.org
Subject: Re: [PATCH v3 00/24] x86_64: Improvements at compressed kernel stage

On Tue, Nov 22, 2022 at 02:12:09PM +0300, Evgeniy Baskov wrote:
> This patchset is aimed
> * to improve UEFI compatibility of compressed kernel code for x86_64
> * to setup proper memory access attributes for code and rodata sections
> * to implement W^X protection policy throughout the whole execution 
>   of compressed kernel for EFISTUB code path. 

Hi Evgeniy,

I've tested this patch set on hardware and QEMU+MU firmware, and it
works for me with a couple of minor issues:

- on one machine that has the DXE protocol but not the EFI one, we get
  an error because the firmware doesn't support EFI_MEMORY_RP
- on QEMU I'm seeing the size of "(unsigned long)_head - image_base"
  wind up as 0, which leads to an EFI_INVALID_PARAMETER on the
  clear_memory_attributes() call.

In both cases the system winds up working, but with unnecessary console
output.  I'll send you patches as a follow-up to this mail.  In the mean
time:

Tested-by: Peter Jones <pjones@...hat.com>

-- 
        Peter