linux-kernel - Re: [PATCH] cpu/speculation: Warn on unsupported mitigations= parameter

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Message-ID: <nycvar.YFH.7.76.1905160947210.22183@cbobk.fhfr.pm>
Date:   Thu, 16 May 2019 09:48:37 +0200 (CEST)
From:   Jiri Kosina <jikos@...nel.org>
To:     Geert Uytterhoeven <geert@...ux-m68k.org>
cc:     Josh Poimboeuf <jpoimboe@...hat.com>,
        Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...nel.org>,
        Peter Zijlstra <peterz@...radead.org>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Ben Hutchings <ben@...adent.org.uk>,
        linux-kernel@...r.kernel.org, stable@...r.kernel.org
Subject: Re: [PATCH] cpu/speculation: Warn on unsupported mitigations=
 parameter

On Thu, 16 May 2019, Geert Uytterhoeven wrote:

> Currently, if the user specifies an unsupported mitigation strategy on
> the kernel command line, it will be ignored silently.  The code will
> fall back to the default strategy, possibly leaving the system more
> vulnerable than expected.

Honestly, I am not convinced. We are not doing this for vast majority of 
other cmdline options either, if for any at all.

Thanks,

-- 
Jiri Kosina
SUSE Labs