From: Marco Elver <elver@google.com>
To: Alexander Popov <alex.popov@linux.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>,
Jonathan Corbet <corbet@lwn.net>,
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Shuah Khan <shuah@kernel.org>,
Lukas Bulwahn <lukas.bulwahn@gmail.com>,
glider@google.com
Subject: Re: [PATCH v2 0/2] Introduce the pkill_on_warn parameter
Date: Sun, 14 Nov 2021 15:21:22 +0100 [thread overview]
Message-ID: <YZEbYmzy64uai7Af@elver.google.com> (raw)
In-Reply-To: <CAHk-=wg+UMNYrR59Z31MhxMzdUEiZMQ1RF9jQvAb6HGBO5EyEA@mail.gmail.com>
On Sat, Nov 13, 2021 at 11:58AM -0800, Linus Torvalds wrote:
> On Sat, Nov 13, 2021 at 10:14 AM Alexander Popov <alex.popov@linux.com> wrote:
[...]
> Honestly, if the intent is to not have to parse the dmesg output, then
> I think it would be much better to introduce a new /proc file to read
> the kernel tainting state, and then some test manager process could be
> able to poll() that file or something. Not sending a signal to random
> targets, but have a much more explicit model.
>
> That said, I'm not convinced that "just read the kernel message log"
> is in any way wrong either.
We had this problem of "need to get errors/warnings that appear in the
kernel log" without actually polling the kernel log all the time. Since
5.12 there's the 'error_report' tracepoint for exactly this purpose [1].
Right now it only generates events on KASAN and KFENCE reports, but we
imagined it's easy enough to extend with more types. Like WARN, should
the need arise (you'd have to add it if you decide to go down that
route).
So you could implement a close-enough variant of the whole thing in
userspace using what tracepoints give you by just monitoring the trace
pipe. It'd be much easier to experiment with different policies as well.
[1] https://git.kernel.org/torvalds/c/9c0dee54eb91d48cca048bd7bd2c1f4a166e0252
next prev parent reply other threads:[~2021-11-14 14:21 UTC|newest]
Thread overview: 31+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-10-27 23:32 [PATCH v2 0/2] Introduce the pkill_on_warn parameter Alexander Popov
2021-10-27 23:32 ` [PATCH v2 1/2] bug: do refactoring allowing to add a warning handling action Alexander Popov
2021-10-27 23:32 ` [PATCH v2 2/2] sysctl: introduce kernel.pkill_on_warn Alexander Popov
2021-11-12 21:24 ` Steven Rostedt
2021-11-12 18:52 ` [PATCH v2 0/2] Introduce the pkill_on_warn parameter Alexander Popov
2021-11-12 21:26 ` Linus Torvalds
2021-11-13 18:14 ` Alexander Popov
2021-11-13 19:58 ` Linus Torvalds
2021-11-14 14:21 ` Marco Elver [this message]
2021-11-15 13:59 ` Lukas Bulwahn
2021-11-15 15:51 ` [ELISA Safety Architecture WG] " Gabriele Paoloni
2021-11-16 7:52 ` Alexander Popov
2021-11-16 8:01 ` Lukas Bulwahn
2021-11-16 8:41 ` Petr Mladek
2021-11-16 9:19 ` Lukas Bulwahn
2021-11-16 13:20 ` James Bottomley
2021-11-15 16:06 ` Steven Rostedt
2021-11-15 22:06 ` Kees Cook
2021-11-16 9:12 ` Alexander Popov
2021-11-16 18:41 ` Kees Cook
2021-11-16 19:00 ` Casey Schaufler
2021-11-18 17:32 ` Kees Cook
2021-11-18 18:30 ` Casey Schaufler
2021-11-18 20:29 ` Kees Cook
2021-11-16 13:07 ` James Bottomley
2021-11-20 12:17 ` Marco Elver
2021-11-22 16:21 ` Steven Rostedt
2021-11-16 6:37 ` Christophe Leroy
2021-11-16 8:34 ` Alexander Popov
2021-11-16 8:57 ` Lukas Bulwahn
2021-11-15 8:12 ` Kaiwan N Billimoria
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