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Date: Tue, 28 Jan 2020 08:58:31 +0100
From: Christian Borntraeger <borntraeger@...ibm.com>
To: Kees Cook <keescook@...omium.org>, Jiri Slaby <jslaby@...e.cz>,
Julian Wiedmann <jwi@...ux.ibm.com>,
Ursula Braun <ubraun@...ux.ibm.com>
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>,
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 28.01.20 00:19, Kees Cook wrote:
> 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?
>
Adding Julian and Ursula. A separate kmem cache for iucv might be indeed
a solution for the user hardening issue.
On the other hand not marking the DMA caches still seems questionable.
For reference
https://bugzilla.suse.com/show_bug.cgi?id=1156053
the kernel hardening now triggers a warning.
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