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Date: Tue, 18 Oct 2022 17:04:47 -0400 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>, 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 00/16] x86_64: Improvements at compressed kernel stage On Tue, Sep 06, 2022 at 01:41:04PM +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 set of patches with the Mu firmware that supports the W^X feature and a modified bootloader to also support it, and also with an existing firmware and the grub2 build in fedora 36. On the firmware without W^X support, this all works for me. With W^X support, it works so long as I use CONFIG_EFI_STUB_EXTRACT_DIRECT, though I still need some changes in grub's loader. IMO that's a big step forward. I can't currently make it work with W^X enabled but without direct extraction, and I'm still investigating why not, but I figured I'd give you a heads up. -- Peter
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