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Message-ID: <202109301132.E29DB764E8@keescook>
Date: Thu, 30 Sep 2021 11:36:26 -0700
From: Kees Cook <keescook@...omium.org>
To: Alexander Popov <alex.popov@...ux.com>
Cc: Andrew Morton <akpm@...ux-foundation.org>,
Jonathan Corbet <corbet@....net>,
Paul McKenney <paulmck@...nel.org>,
Thomas Gleixner <tglx@...utronix.de>,
Peter Zijlstra <peterz@...radead.org>,
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>,
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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 09:27:43PM +0300, Alexander Popov wrote:
> On 30.09.2021 02:31, Andrew Morton wrote:
> > On Wed, 29 Sep 2021 22:01:33 +0300 Alexander Popov <alex.popov@...ux.com> wrote:
> >
> >> On 29.09.2021 21:58, Alexander Popov wrote:
> >> [...]
> >> If you are fine with this approach, I will prepare a patch adding the
> >> pkill_on_warn sysctl.
> >
> > Why do we need a boot parameter? Isn't a sysctl all we need for this
> > feature?
>
> I would say we need both sysctl and boot parameter for pkill_on_warn.
> That would be consistent with panic_on_warn, ftrace_dump_on_oops and
> oops/panic_on_oops.
If you want to change it at runtime, just make a sysctl: it will
be available as a bootparam since v5.8. See commit 3db978d480e2
("kernel/sysctl: support setting sysctl parameters from kernel command
line")
--
Kees Cook
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