linux-kernel - Re: [PATCH v2 0/2] Introduce the pkill_on

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Message-ID: <fd86a05b-feca-c0a9-c6b0-b2e69c650021@schaufler-ca.com>
Date:   Tue, 16 Nov 2021 11:00:23 -0800
From:   Casey Schaufler <casey@...aufler-ca.com>
To:     Kees Cook <keescook@...omium.org>,
        Alexander Popov <alex.popov@...ux.com>
Cc:     Steven Rostedt <rostedt@...dmis.org>,
        Linus Torvalds <torvalds@...ux-foundation.org>,
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        Casey Schaufler <casey@...aufler-ca.com>
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?