linux-kernel - Re: [PATCH] sysctl: add config to make randomize_va

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Date:   Fri, 5 May 2023 09:35:59 +0200
From:   David Hildenbrand <david@...hat.com>
To:     Michael McCracken <michael.mccracken@...il.com>,
        linux-kernel@...r.kernel.org
Cc:     kernel-hardening@...ts.openwall.com, serge@...lyn.com,
        tycho@...ho.pizza, Luis Chamberlain <mcgrof@...nel.org>,
        Kees Cook <keescook@...omium.org>,
        Iurii Zaikin <yzaikin@...gle.com>,
        Andrew Morton <akpm@...ux-foundation.org>,
        linux-fsdevel@...r.kernel.org, linux-mm@...ck.org
Subject: Re: [PATCH] sysctl: add config to make randomize_va_space RO

On 04.05.23 23:30, Michael McCracken wrote:
> Add config RO_RANDMAP_SYSCTL to set the mode of the randomize_va_space
> sysctl to 0444 to disallow all runtime changes. This will prevent
> accidental changing of this value by a root service.
> 
> The config is disabled by default to avoid surprises.

Can you elaborate why we care about "accidental changing of this value 
by a root service"?

We cannot really stop root from doing a lot of stupid things (e.g., 
erase the root fs), so why do we particularly care here?

-- 
Thanks,

David / dhildenb