[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]
Message-ID: <alpine.DEB.2.22.394.2010060833000.99155@www.lameter.com>
Date: Tue, 6 Oct 2020 08:35:50 +0000 (UTC)
From: Christopher Lameter <cl@...ux.com>
To: Kees Cook <keescook@...omium.org>
cc: Matthew Wilcox <willy@...radead.org>, Jann Horn <jannh@...gle.com>,
Alexander Popov <alex.popov@...ux.com>, Will Deacon <will@...nel.org>,
Andrey Ryabinin <aryabinin@...tuozzo.com>,
Alexander Potapenko <glider@...gle.com>,
Dmitry Vyukov <dvyukov@...gle.com>, Pekka Enberg <penberg@...nel.org>,
David Rientjes <rientjes@...gle.com>, Joonsoo Kim <iamjoonsoo.kim@....com>,
Andrew Morton <akpm@...ux-foundation.org>,
Masahiro Yamada <masahiroy@...nel.org>,
Masami Hiramatsu <mhiramat@...nel.org>,
Steven Rostedt <rostedt@...dmis.org>,
Peter Zijlstra <peterz@...radead.org>,
Krzysztof Kozlowski <krzk@...nel.org>,
Patrick Bellasi <patrick.bellasi@....com>,
David Howells <dhowells@...hat.com>,
Eric Biederman <ebiederm@...ssion.com>,
Johannes Weiner <hannes@...xchg.org>, Laura Abbott <labbott@...hat.com>,
Arnd Bergmann <arnd@...db.de>,
Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
Daniel Micay <danielmicay@...il.com>,
Andrey Konovalov <andreyknvl@...gle.com>, Pavel Machek <pavel@...x.de>,
Valentin Schneider <valentin.schneider@....com>,
kasan-dev <kasan-dev@...glegroups.com>, Linux-MM <linux-mm@...ck.org>,
Kernel Hardening <kernel-hardening@...ts.openwall.com>,
kernel list <linux-kernel@...r.kernel.org>, notify@...nel.org
Subject: Re: [PATCH RFC v2 0/6] Break heap spraying needed for exploiting
use-after-free
On Mon, 5 Oct 2020, Kees Cook wrote:
> > TYPESAFE_BY_RCU, but if forcing that on by default would enhance security
> > by a measurable amount, it wouldn't be a terribly hard sell ...
>
> Isn't the "easy" version of this already controlled by slab_merge? (i.e.
> do not share same-sized/flagged kmem_caches between different caches)
Right.
> The large trouble are the kmalloc caches, which don't have types
> associated with them. Having implicit kmem caches based on the type
> being allocated there would need some pretty extensive plumbing, I
> think?
Actually typifying those accesses may get rid of a lot of kmalloc
allocations and could help to ease the management and control of objects.
It may be a big task though given the ubiquity of kmalloc and the need to
create a massive amount of new slab caches. This is going to reduce the
cache hit rate significantly.
Powered by blists - more mailing lists
Confused about mailing lists and their use?
Read about mailing lists on Wikipedia
and check out these
guidelines on proper formatting of your messages.
