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

Kees Cook
2020-01-27T23:20:22Z

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