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Date: Tue, 16 Nov 2021 11:00:23 -0800
From: Casey Schaufler <>
To: Kees Cook <>, Alexander Popov <>
Cc: Steven Rostedt <>,
 Linus Torvalds <>,
 Lukas Bulwahn <>, Jonathan Corbet <>,
 Paul McKenney <>, Andrew Morton
 <>, Thomas Gleixner <>,
 Peter Zijlstra <>, Joerg Roedel <>,
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 Randy Dunlap <>, Lu Baolu <>,
 Petr Mladek <>, Luis Chamberlain <>,
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 <>, Greg Kroah-Hartman <>,
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 Dave Hansen <>, Will Deacon <>,
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 David S Miller <>, Borislav Petkov <>,
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 Mathieu Chouquet-Stringer <>,
 Daniel Borkmann <>, Stephen Kitt <>,
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 Mike Rapoport <>, Bjorn Andersson
 Kernel Hardening <>,,
 "open list:DOCUMENTATION" <>,
 linux-arch <>,
 Linux Kernel Mailing List <>,
 linux-fsdevel <>,,,,, Shuah Khan <>,
 Casey Schaufler <>
Subject: Re: [PATCH v2 0/2] Introduce the pkill_on_warn parameter

On 11/16/2021 10:41 AM, Kees Cook wrote:
> On Tue, Nov 16, 2021 at 12:12:16PM +0300, Alexander Popov wrote:
>> What if the Linux kernel had a LSM module responsible for error handling policy?
>> That would require adding LSM hooks to BUG*(), WARN*(), KERN_EMERG, etc.
>> In such LSM policy we can decide immediately how to react on the kernel error.
>> We can even decide depending on the subsystem and things like that.
> That would solve the "atomicity" issue the WARN tracepoint solution has,
> and it would allow for very flexible userspace policy.
> I actually wonder if the existing panic_on_* sites should serve as a
> guide for where to put the hooks. The current sysctls could be replaced
> by the hooks and a simple LSM.

Do you really want to make error handling a "security" issue?
If you add security_bug(), security_warn_on() and the like
you're begging that they be included in SELinux (AppArmor) policy.
BPF, too, come to think of it. Is that what you want?

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