linux-kernel - Re: [RFC 00/12] module: avoid userspace pressure on unwanted allocations

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Message-ID: <3b25ed5c-8fb9-82d3-2296-fadbbb4db7e4@redhat.com>
Date:   Wed, 15 Mar 2023 13:24:41 +0100
From:   David Hildenbrand <david@...hat.com>
To:     Luis Chamberlain <mcgrof@...nel.org>,
        linux-modules@...r.kernel.org, linux-kernel@...r.kernel.org,
        pmladek@...e.com, petr.pavlu@...e.com, prarit@...hat.com
Cc:     christophe.leroy@...roup.eu, song@...nel.org,
        torvalds@...ux-foundation.org
Subject: Re: [RFC 00/12] module: avoid userspace pressure on unwanted
 allocations

On 11.03.23 06:17, Luis Chamberlain wrote:
> A long time ago we had some issues with userspace doing stupid stuff.
> Well, it turns out even the kernel and do stupid stuff too, as we're
> learning with the ACPI modules aliaes and that hammering tons of loads.
> 
> So add a bit of code which gets us a bit more in the defensive about
> these situations.
> 
> To experiment, this also adds in-kernel alias support to see if this helps
> with some larger systems.
> 
> This is all based on some old code which tried to add defensive
> mechanisms the last of which was here and I had dropped the ball:
> 
> https://lore.kernel.org/all/20171208001540.23696-1-mcgrof@kernel.org/
> 
> I've only compile tested this for now. Will need to stress to test
> with kmod tests 0008 and 0009 to see if there's any differences.
> I'll have to re-test and re-gnuplot stuff there. But early feedback
> is appreciated, hence the RFC.
> 
> David Hildenbrand had reported a while ago issues with userspace
> doing insane things with allocations bringing a system down to
> its knees. This is part of the motivation for this series.


I'll try to grab a system where I can reproduce the issue and give your 
patches a churn.

Thanks!

-- 
Thanks,

David / dhildenb