linux-kernel - RE: [PATCH 04/36] usercopy: Prepare for usercopy whitelisting

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Message-ID: <b8c3f85827ca493e9f4517f646ac97da@AcuMS.aculab.com>
Date:   Fri, 12 Jan 2018 15:10:42 +0000
From:   David Laight <David.Laight@...LAB.COM>
To:     'Christopher Lameter' <cl@...ux.com>,
        Kees Cook <keescook@...omium.org>
CC:     "linux-kernel@...r.kernel.org" <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-mm@...ck.org>,
        "linux-xfs@...r.kernel.org" <linux-xfs@...r.kernel.org>,
        Linus Torvalds <torvalds@...ux-foundation.org>,
        Alexander Viro <viro@...iv.linux.org.uk>,
        Andy Lutomirski <luto@...nel.org>,
        Christoph Hellwig <hch@...radead.org>,
        "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>,
        Christian Borntraeger <borntraeger@...ibm.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-fsdevel@...r.kernel.org>,
        "linux-arch@...r.kernel.org" <linux-arch@...r.kernel.org>,
        "netdev@...r.kernel.org" <netdev@...r.kernel.org>,
        "kernel-hardening@...ts.openwall.com" 
        <kernel-hardening@...ts.openwall.com>
Subject: RE: [PATCH 04/36] usercopy: Prepare for usercopy whitelisting

From: Christopher Lameter
> Sent: 10 January 2018 18:28
> On Tue, 9 Jan 2018, Kees Cook wrote:
> 
> > +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 *));
> 
> 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