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

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Date:   Wed, 10 Jan 2018 12:28:23 -0600 (CST)
From:   Christopher Lameter <cl@...ux.com>
To:     Kees Cook <keescook@...omium.org>
cc:     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-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-arch@...r.kernel.org,
        netdev@...r.kernel.org, kernel-hardening@...ts.openwall.com
Subject: Re: [PATCH 04/36] usercopy: Prepare for usercopy whitelisting

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.

> index 2181719fd907..70c4b4bb4d1f 100644
> --- a/include/linux/stddef.h
> +++ b/include/linux/stddef.h
> @@ -19,6 +19,8 @@ enum {
>  #define offsetof(TYPE, MEMBER)	((size_t)&((TYPE *)0)->MEMBER)
>  #endif
>
> +#define sizeof_field(structure, field) sizeof((((structure *)0)->field))
> +
>  /**
>   * offsetofend(TYPE, MEMBER)
>   *

Have a separate patch for adding this functionality? Its not a slab
maintainer
file.

Rest looks ok.

Acked-by: Christoph Lameter <cl@...ux.com>