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From: David Laight <David.Laight@ACULAB.COM>
Date: Fri, 12 Jan 2018 15:10:42 +0000
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Subject: [kernel-hardening] RE: [PATCH 04/36] usercopy: Prepare for usercopy whitelisting
To: 'Christopher Lameter' <cl@linux.com>, Kees Cook <keescook@chromium.org>
Cc: "linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>, David
 Windsor <dave@nullcore.net>, Pekka Enberg <penberg@kernel.org>, David
 Rientjes <rientjes@google.com>, Joonsoo Kim <iamjoonsoo.kim@lge.com>, Andrew Morton <akpm@linux-foundation.org>, "linux-mm@kvack.org" <linux-mm@kvack.org>, "linux-xfs@vger.kernel.org" <linux-xfs@vger.kernel.org>, Linus Torvalds <torvalds@linux-foundation.org>, Alexander Viro <viro@zeniv.linux.org.uk>, Andy Lutomirski <luto@kernel.org>, Christoph Hellwig <hch@infradead.org>, "David S. Miller" <davem@davemloft.net>, Laura Abbott <labbott@redhat.com>, Mark Rutland <mark.rutland@arm.com>, "Martin K. Petersen" <martin.petersen@oracle.com>, Paolo Bonzini <pbonzini@redhat.com>, Christian Borntraeger <borntraeger@de.ibm.com>, Christoffer Dall <christoffer.dall@linaro.org>, Dave Kleikamp <dave.kleikamp@oracle.com>, Jan Kara <jack@suse.cz>, Luis de
 Bethencourt <luisbg@kernel.org>, Marc Zyngier <marc.zyngier@arm.com>, Rik
 van Riel <riel@redhat.com>, Matthew Garrett <mjg59@google.com>, "linux-fsdevel@vger.kernel.org" <linux-fsdevel@vger.kernel.org>, "linux-arch@vger.kernel.org" <linux-arch@vger.kernel.org>, "netdev@vger.kernel.org" <netdev@vger.kernel.org>, "kernel-hardening@lists.openwall.com" <kernel-hardening@lists.openwall.com>
List-ID: <kernel-hardening.lists.openwall.com>

From: Christopher Lameter
> Sent: 10 January 2018 18:28
> On Tue, 9 Jan 2018, Kees Cook wrote:
>=20
> > +struct kmem_cache *kmem_cache_create_usercopy(const char *name,
> > +			size_t size, size_t align, slab_flags_t flags,
> > +			size_t useroffset, size_t usersize,
> > +			void (*ctor)(void *));
>=20
> Hmmm... At some point we should switch kmem_cache_create to pass a struct
> containing all the parameters. Otherwise the API will blow up with
> additional functions.

Or add an extra function to 'configure' the kmem_cache with the
extra parameters.

	David