Subject: Re: [kernel-hardening] [PATCH 09/38] usercopy: Mark kmalloc caches as usercopy caches

From: Kees Cook <[email-masked]>
Date: Mon, 27 Jan 2020 15:19:59 -0800

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/[email-masked]/

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

-- 
Kees Cook