linux-kernel - Re: [PATCH v2 RESEND] x86/kaslr: Ingest nokaslr to avoid passing it to init process

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Message-ID: <20250114140954.GR5388@noisy.programming.kicks-ass.net>
Date: Tue, 14 Jan 2025 15:09:54 +0100
From: Peter Zijlstra <peterz@...radead.org>
To: Borislav Petkov <bp@...en8.de>
Cc: Nir Lichtman <nir_lichtman@...mail.com>,
	"dave.hansen@...ux.intel.com" <dave.hansen@...ux.intel.com>,
	"luto@...nel.org" <luto@...nel.org>,
	"tglx@...utronix.de" <tglx@...utronix.de>,
	"mingo@...hat.com" <mingo@...hat.com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"m.younesbadr@...il.com" <m.younesbadr@...il.com>,
	Nir Lichtman <nir@...htman.org>
Subject: Re: [PATCH v2 RESEND] x86/kaslr: Ingest nokaslr to avoid passing it
 to init process

On Tue, Jan 14, 2025 at 01:31:42PM +0100, Borislav Petkov wrote:
> On Tue, Jan 14, 2025 at 10:36:43AM +0100, Peter Zijlstra wrote:
> > On Sat, Jan 11, 2025 at 02:17:43PM +0000, Nir Lichtman wrote:
> > > Problem: Currently booting the kernel with "nokaslr" on x86 incorrectly
> > > doesn't recognize this parameter and passes it on to the init process
> > 
> > What now? I'm pretty sure nokaslr works, it's in all my test machines
> > and qemu scripts. Without it faddr2line wouldn't work, which I would
> > notice in a hurry.
> 
> Yeah, the param itself works - he doesn't want to pass it on to the init
> process because then it says:
> 
> [    0.073613] Unknown kernel command line parameters "nokaslr", will be passed to user space.
> 
> due to our detection of which parameters got eaten and which didn't.

I had never noticed; random machine of mine says:

[    0.591565] Unknown kernel command line parameters "force_early_printk nokaslr kgdboc=ttyS0", will be passed to user space.

*shrug*, who cares.