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

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Message-ID: <CAGXu5j+BcHbg4z_zZO8fsjFvQ1TCVvC1TH3d8J=1qXusAqXwLw@mail.gmail.com>
Date:   Wed, 10 Jan 2018 13:06:13 -0800
From:   Kees Cook <keescook@...omium.org>
To:     Christopher Lameter <cl@...ux.com>
Cc:     LKML <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 <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-fsdevel@...r.kernel.org>,
        linux-arch <linux-arch@...r.kernel.org>,
        Network Development <netdev@...r.kernel.org>,
        kernel-hardening@...ts.openwall.com
Subject: Re: [PATCH 04/36] usercopy: Prepare for usercopy whitelisting

On Wed, Jan 10, 2018 at 10:28 AM, Christopher Lameter <cl@...ux.com> wrote:
> 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.

Good idea; I've done this now.

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

Thanks!

-Kees

-- 
Kees Cook
Pixel Security