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Date: Thu, 23 Jan 2020 09:14:20 +0100
From: Jiri Slaby <>
To: Kees Cook <>,
 Alexander Viro <>
Cc:, David Windsor <>,
 Pekka Enberg <>, David Rientjes <>,
 Joonsoo Kim <>,
 Andrew Morton <>,,, Linus Torvalds <>,
 Andy Lutomirski <>, Christoph Hellwig <>,
 Christoph Lameter <>, "David S. Miller" <>,
 Laura Abbott <>, Mark Rutland <>,
 "Martin K. Petersen" <>,
 Paolo Bonzini <>,
 Christian Borntraeger <>,
 Christoffer Dall <>,
 Dave Kleikamp <>, Jan Kara <>,
 Luis de Bethencourt <>, Marc Zyngier
 <>, Rik van Riel <>,
 Matthew Garrett <>,,,,, Vlastimil Babka <>,
 Michal Kubecek <>
Subject: Re: [PATCH 09/38] usercopy: Mark kmalloc caches as
 usercopy caches

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...

suse labs

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