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Date:   Thu, 30 Sep 2021 11:20:34 -0700
From:   Kees Cook <keescook@...omium.org>
To:     Alexander Popov <alex.popov@...ux.com>
Cc:     Dave Hansen <dave.hansen@...el.com>,
        Peter Zijlstra <peterz@...radead.org>,
        Jonathan Corbet <corbet@....net>,
        Paul McKenney <paulmck@...nel.org>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        Joerg Roedel <jroedel@...e.de>,
        Maciej Rozycki <macro@...am.me.uk>,
        Muchun Song <songmuchun@...edance.com>,
        Viresh Kumar <viresh.kumar@...aro.org>,
        Robin Murphy <robin.murphy@....com>,
        Randy Dunlap <rdunlap@...radead.org>,
        Lu Baolu <baolu.lu@...ux.intel.com>,
        Petr Mladek <pmladek@...e.com>,
        Luis Chamberlain <mcgrof@...nel.org>, Wei Liu <wl@....org>,
        John Ogness <john.ogness@...utronix.de>,
        Andy Shevchenko <andriy.shevchenko@...ux.intel.com>,
        Alexey Kardashevskiy <aik@...abs.ru>,
        Christophe Leroy <christophe.leroy@...roup.eu>,
        Jann Horn <jannh@...gle.com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Mark Rutland <mark.rutland@....com>,
        Andy Lutomirski <luto@...nel.org>,
        Dave Hansen <dave.hansen@...ux.intel.com>,
        Steven Rostedt <rostedt@...dmis.org>,
        Will Deacon <will.deacon@....com>,
        David S Miller <davem@...emloft.net>,
        Borislav Petkov <bp@...en8.de>,
        kernel-hardening@...ts.openwall.com,
        linux-hardening@...r.kernel.org, linux-doc@...r.kernel.org,
        linux-kernel@...r.kernel.org, notify@...nel.org
Subject: Re: [PATCH] Introduce the pkill_on_warn boot parameter

On Thu, Sep 30, 2021 at 04:55:37PM +0300, Alexander Popov wrote:
> The kernel can hit warning and omit calling __warn() that prints the message.
> But pkill_on_warn action should be taken each time.
> 
> As I can understand now, include/asm-generic/bug.h defines three warning
> implementations:
>  1. CONFIG_BUG=y and the arch provides __WARN_FLAGS. In that case pkill_on_warn
> should be checked in report_bug() that you mention.
>  2. CONFIG_BUG=y and the arch doesn't have __WARN_FLAGS. In that case
> pkill_on_warn should be checked in warn_slowpath_fmt().
>  3. CONFIG_BUG is not set. In that case pkill_on_warn should not be considered.
> 
> Please, correct me if needed.

That looks correct to me, yes.

-- 
Kees Cook

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