linux-kernel - Re: [PATCH v3 11/13] retpoline/taint: Taint kernel for missing retpoline in compiler

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Message-ID: <CAFxkdAou+kYvHhB52RTpJnMJ3jCbco5vzKv0HZe==XtDAOhEZA@mail.gmail.com>
Date:   Thu, 4 Jan 2018 16:06:02 -0600
From:   Justin Forbes <jmforbes@...uxtx.org>
To:     David Woodhouse <dwmw@...zon.co.uk>
Cc:     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>,
        Jiri Kosina <jikos@...nel.org>,
        Alan Cox <gnomes@...rguk.ukuu.org.uk>
Subject: Re: [PATCH v3 11/13] retpoline/taint: Taint kernel for missing
 retpoline in compiler

On Thu, Jan 4, 2018 at 8:37 AM, David Woodhouse <dwmw@...zon.co.uk> wrote:
> From: Andi Kleen <ak@...ux.intel.com>
>
> When the kernel or a module hasn't been compiled with a retpoline
> aware compiler, print a warning and set a taint flag.
>
> For modules it is checked at compile time, however it cannot
> check assembler or other non compiled objects used in the module link.
>
> Due to lack of better letter it uses taint option 'Z'
>

Is taint really the right thing to do here? Why not just do pr_info?