linux-kernel - Re: [PATCH v8 04/12] x86/spectre: Add boot time option to select Spectre v2 mitigation

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Message-ID: <20180123230545.jufkdgttxe4eiswf@pd.tnic>
Date:   Wed, 24 Jan 2018 00:05:45 +0100
From:   Borislav Petkov <bp@...en8.de>
To:     Jiri Kosina <jikos@...nel.org>
Cc:     David Woodhouse <dwmw@...zon.co.uk>,
        Andi Kleen <ak@...ux.intel.com>, Paul Turner <pjt@...gle.com>,
        LKML <linux-kernel@...r.kernel.org>,
        Linus Torvalds <torvalds@...ux-foundation.org>,
        Greg Kroah-Hartman <gregkh@...ux-foundation.org>,
        Tim Chen <tim.c.chen@...ux.intel.com>,
        Dave Hansen <dave.hansen@...el.com>,
        Thomas Gleixner <tglx@...utronix.de>,
        Kees Cook <keescook@...gle.com>,
        Rik van Riel <riel@...hat.com>,
        Peter Zijlstra <peterz@...radead.org>,
        Andy Lutomirski <luto@...capital.net>,
        gnomes@...rguk.ukuu.org.uk, x86@...nel.org,
        thomas.lendacky@....com, Josh Poimboeuf <jpoimboe@...hat.com>
Subject: Re: [PATCH v8 04/12] x86/spectre: Add boot time option to select
 Spectre v2 mitigation

On Tue, Jan 23, 2018 at 11:55:05PM +0100, Jiri Kosina wrote:
> I think we should start recording CFLAGS the kernel has been compiled with 
> anyway; doesn't hurt and might come handy when debugging.
> 
> /proc/version is probably not the best place ... /proc/cflags?

Yap, I guess I can find that string with hexdump on the kernel binary too :-)

-- 
Regards/Gruss,
    Boris.

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