linux-hardening - Re: [PATCH] stackleak: don't modify ctl

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Date: Fri, 3 May 2024 07:58:16 -0600
From: Tycho Andersen <tycho@...ho.pizza>
To: Thomas Weißschuh <linux@...ssschuh.net>
Cc: Kees Cook <keescook@...omium.org>,
	Alexander Popov <alex.popov@...ux.com>,
	linux-hardening@...r.kernel.org, linux-kernel@...r.kernel.org,
	stable@...r.kernel.org, Luis Chamberlain <mcgrof@...nel.org>,
	Joel Granados <j.granados@...sung.com>
Subject: Re: [PATCH] stackleak: don't modify ctl_table argument

On Fri, May 03, 2024 at 03:44:09PM +0200, Thomas Weißschuh wrote:
> Sysctl handlers are not supposed to modify the ctl_table passed to them.
> Adapt the logic to work with a temporary
> variable, similar to how it is done in other parts of the kernel.
> 
> This is also a prerequisite to enforce the immutability of the argument
> through the callbacks prototy.
> 
> Fixes: 964c9dff0091 ("stackleak: Allow runtime disabling of kernel stack erasing")

Reviewed-by: Tycho Andersen <tycho@...ho.pizza>

Tycho