linux-kernel - Re: [PATCH] x86/mm: Do not verify W^X at boot up

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Message-ID: <Y1eu2wFVp1zcLg5b@hirez.programming.kicks-ass.net>
Date:   Tue, 25 Oct 2022 11:39:39 +0200
From:   Peter Zijlstra <peterz@...radead.org>
To:     Linus Torvalds <torvalds@...ux-foundation.org>
Cc:     Steven Rostedt <rostedt@...dmis.org>,
        LKML <linux-kernel@...r.kernel.org>,
        Kees Cook <keescook@...omium.org>,
        Dave Hansen <dave.hansen@...el.com>,
        Sean Christopherson <seanjc@...gle.com>
Subject: Re: [PATCH] x86/mm: Do not verify W^X at boot up

On Mon, Oct 24, 2022 at 12:08:49PM -0700, Linus Torvalds wrote:
> I suspect it would be fixed by just moving 'poking_init()' earlier. In
> many ways I suspect it would make most sense as part of 'mm_init()',
> not as a random call fairly late in start_kernel().

dup_mm() doesn't work until after proc_caches_init() at the very least.

Let me see if I can untangle some of this..