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

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Date:   Mon, 5 Oct 2020 12:25:21 +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 13:19
> 
> On 05.10.20 13:21, David Laight wrote:
> > 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?
> 
> You mean via something like a boot parameter? Possibly yes.

I was thinking of later.
Some kind of restricted system might want the 'clobber'
mount() after everything is running.

	David

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