linux-kernel - RE: [PATCH] mm: optionally disable brk()

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Message-ID: <5fb32353b1964299809fce0c7579a092@AcuMS.aculab.com>
Date:   Mon, 5 Oct 2020 11:21:37 +0000
From:   David Laight <David.Laight@...LAB.COM>
To:     'David Hildenbrand' <david@...hat.com>,
        Topi Miettinen <toiwoton@...il.com>,
        Michal Hocko <mhocko@...e.com>
CC:     "akpm@...ux-foundation.org" <akpm@...ux-foundation.org>,
        "linux-mm@...ck.org" <linux-mm@...ck.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: RE: [PATCH] mm: optionally disable brk()

From: David Hildenbrand
> Sent: 05 October 2020 10:55
...
> > If hardening and compatibility are seen as tradeoffs, perhaps there
> > could be a top level config choice (CONFIG_HARDENING_TRADEOFF) for this.
> > It would have options
> > - "compatibility" (default) to gear questions for maximum compatibility,
> > deselecting any hardening options which reduce compatibility
> > - "hardening" to gear questions for maximum hardening, deselecting any
> > compatibility options which reduce hardening
> > - "none/manual": ask all questions like before
> 
> I think the general direction is to avoid an exploding set of config
> options. So if there isn't a *real* demand, I guess gluing this to a
> single option ("CONFIG_SECURITY_HARDENING") might be good enough.

Wouldn't that be better achieved by run-time clobbering
of the syscall vectors?

	David

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