netdev - Re: [PATCH 02/38] usercopy: Enhance and rename report

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Date:   Sun, 14 Jan 2018 12:57:50 -0800
From:   Kees Cook <keescook@...omium.org>
To:     Christopher Lameter <cl@...ux.com>
Cc:     LKML <linux-kernel@...r.kernel.org>,
        Linus Torvalds <torvalds@...ux-foundation.org>,
        David Windsor <dave@...lcore.net>,
        Alexander Viro <viro@...iv.linux.org.uk>,
        Andrew Morton <akpm@...ux-foundation.org>,
        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>,
        Linux-MM <linux-mm@...ck.org>,
        kernel-hardening@...ts.openwall.com
Subject: Re: [PATCH 02/38] usercopy: Enhance and rename report_usercopy()

On Thu, Jan 11, 2018 at 9:06 AM, Christopher Lameter <cl@...ux.com> wrote:
> On Wed, 10 Jan 2018, Kees Cook wrote:
>
>> diff --git a/mm/slab.h b/mm/slab.h
>> index ad657ffa44e5..7d29e69ac310 100644
>> --- a/mm/slab.h
>> +++ b/mm/slab.h
>> @@ -526,4 +526,10 @@ static inline int cache_random_seq_create(struct kmem_cache *cachep,
>>  static inline void cache_random_seq_destroy(struct kmem_cache *cachep) { }
>>  #endif /* CONFIG_SLAB_FREELIST_RANDOM */
>>
>> +#ifdef CONFIG_HARDENED_USERCOPY
>> +void __noreturn usercopy_abort(const char *name, const char *detail,
>> +                            bool to_user, unsigned long offset,
>> +                            unsigned long len);
>> +#endif
>> +
>>  #endif /* MM_SLAB_H */
>
> This code has nothing to do with slab allocation. Move it into
> include/linux/uaccess.h where the other user space access definitions are?

Since it was only the mm/sl*b.c files using it, it seemed like the
right place, but it's a reasonable point. I've moved it now.

-Kees

-- 
Kees Cook
Pixel Security