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Message-ID: <202001271519.AA6ADEACF0@keescook>
Date: Mon, 27 Jan 2020 15:19:59 -0800
From: Kees Cook <keescook@...omium.org>
To: Jiri Slaby <jslaby@...e.cz>
Cc: Alexander Viro <viro@...iv.linux.org.uk>, linux-kernel@...r.kernel.org,
	David Windsor <dave@...lcore.net>,
	Pekka Enberg <penberg@...nel.org>,
	David Rientjes <rientjes@...gle.com>,
	Joonsoo Kim <iamjoonsoo.kim@....com>,
	Andrew Morton <akpm@...ux-foundation.org>, linux-mm@...ck.org,
	linux-xfs@...r.kernel.org,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Andy Lutomirski <luto@...nel.org>,
	Christoph Hellwig <hch@...radead.org>,
	Christoph Lameter <cl@...ux.com>,
	"David S. Miller" <davem@...emloft.net>,
	Laura Abbott <labbott@...hat.com>,
	Mark Rutland <mark.rutland@....com>,
	"Martin K. Petersen" <martin.petersen@...cle.com>,
	Paolo Bonzini <pbonzini@...hat.com>,
	Christian Borntraeger <borntraeger@...ibm.com>,
	Christoffer Dall <christoffer.dall@...aro.org>,
	Dave Kleikamp <dave.kleikamp@...cle.com>, Jan Kara <jack@...e.cz>,
	Luis de Bethencourt <luisbg@...nel.org>,
	Marc Zyngier <marc.zyngier@....com>, Rik van Riel <riel@...hat.com>,
	Matthew Garrett <mjg59@...gle.com>, linux-fsdevel@...r.kernel.org,
	linux-arch@...r.kernel.org, netdev@...r.kernel.org,
	kernel-hardening@...ts.openwall.com,
	Vlastimil Babka <vbabka@...e.cz>, Michal Kubecek <mkubecek@...e.cz>
Subject: Re: [PATCH 09/38] usercopy: Mark kmalloc caches
 as usercopy caches

On Thu, Jan 23, 2020 at 09:14:20AM +0100, Jiri Slaby wrote:
> On 14. 11. 19, 22:27, Kees Cook wrote:
> > On Tue, Nov 12, 2019 at 01:21:54PM -0800, Kees Cook wrote:
> >> How is iucv the only network protocol that has run into this? Do others
> >> use a bounce buffer?
> > 
> > Another solution would be to use a dedicated kmem cache (instead of the
> > shared kmalloc dma one)?
> 
> Has there been any conclusion to this thread yet? For the time being, we
> disabled HARDENED_USERCOPY on s390...
> 
> https://lore.kernel.org/kernel-hardening/9519edb7-456a-a2fa-659e-3e5a1ff89466@suse.cz/

I haven't heard anything new. What did people think of a separate kmem
cache?

-- 
Kees Cook

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