linux-kernel - Re: [PATCH -v2 0/7] module: Strict per-modname namespaces

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Message-ID: <20250502125533.GA4198@noisy.programming.kicks-ass.net>
Date: Fri, 2 May 2025 14:55:33 +0200
From: Peter Zijlstra <peterz@...radead.org>
To: "Roy, Patrick" <roypat@...zon.co.uk>
Cc: "da.gomez@...sung.com" <da.gomez@...sung.com>,
	"gregkh@...uxfoundation.org" <gregkh@...uxfoundation.org>,
	"hch@...radead.org" <hch@...radead.org>,
	"hpa@...or.com" <hpa@...or.com>,
	"linux-kbuild@...r.kernel.org" <linux-kbuild@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"linux-modules@...r.kernel.org" <linux-modules@...r.kernel.org>,
	"masahiroy@...nel.org" <masahiroy@...nel.org>,
	"mcgrof@...nel.org" <mcgrof@...nel.org>,
	"nathan@...nel.org" <nathan@...nel.org>,
	"nicolas@...sle.eu" <nicolas@...sle.eu>,
	"petr.pavlu@...e.com" <petr.pavlu@...e.com>,
	"samitolvanen@...gle.com" <samitolvanen@...gle.com>,
	"x86@...nel.org" <x86@...nel.org>
Subject: Re: [PATCH -v2 0/7] module: Strict per-modname namespaces

On Fri, May 02, 2025 at 11:55:54AM +0000, Roy, Patrick wrote:
> Hi Peter,
> 
> Are you still working on this patch series? I'm working on having KVM remove
> virtual machine memory from the kernel's direct map, to harden again
> speculative execution attacks [1]. At David H.'s LSF/MM/BPF task on
> guest_memfd, it was suggested to use per-modname namespaces to export
> set_direct_map_valid() specifically for use in KVM to achieve this.
> 
> Is there anything I can do to help get this across the finish line
> (testing/etc.)?

Hmm, I had more or less forgotten about this.

Let me rebase and address the comments.