linux-kernel - Re: [PATCH] genirq/debugfs: add new config option for trigger interrupt from userspace

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Date:   Fri, 28 Feb 2020 16:37:17 +0000
From:   Marc Zyngier <maz@...nel.org>
To:     Joe Jin <joe.jin@...cle.com>
Cc:     Thomas Gleixner <tglx@...utronix.de>, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] genirq/debugfs: add new config option for trigger
 interrupt from userspace

Hi Joe,

On 2020-02-28 05:42, Joe Jin wrote:
> commit 536e2e34bd00 ("genirq/debugfs: Triggering of interrupts from
> userspace") is allowed developer inject interrupts via irq debugfs, 
> which
> is very useful during development phase, but on a production system, 
> this
> is very dangerous, add new config option, developers can enable it as
> needed instead of enabling it by default when irq debugfs is enabled.

I don't really mind the patch (although it could be more elegant), but 
in
general I object to most debugfs options being set on a production 
kernel.
There is way too much information in most debugfs backends to be 
comfortable
with it, and you can find things like page table dumps, for example...

         M.
-- 
Jazz is not dead. It just smells funny...