linux-kernel - Re: [PATCH v2 08/20] randstruct: Whitelist NIU struct page overloading

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Message-ID: <20170528081541.GE22193@infradead.org>
Date:   Sun, 28 May 2017 01:15:41 -0700
From:   Christoph Hellwig <hch@...radead.org>
To:     Kees Cook <keescook@...omium.org>
Cc:     kernel-hardening@...ts.openwall.com,
        "David S . Miller" <davem@...emloft.net>,
        Laura Abbott <labbott@...hat.com>, x86@...nel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2 08/20] randstruct: Whitelist NIU struct page
 overloading

On Fri, May 26, 2017 at 01:17:12PM -0700, Kees Cook wrote:
> The NIU ethernet driver intentionally stores a page struct pointer on
> top of the "mapping" field. Whitelist this case:
> 
> drivers/net/ethernet/sun/niu.c: In function ‘niu_rx_pkt_ignore’:
> drivers/net/ethernet/sun/niu.c:3402:10: note: found mismatched ssa struct pointer types: ‘struct page’ and ‘struct address_space’
> 
>     *link = (struct page *) page->mapping;
>     ~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
> 
> Cc: David S. Miller <davem@...emloft.net>
> Signed-off-by: Kees Cook <keescook@...omium.org>

The driver really needs to stop doing this anyway.  It would be good
to send this out to linux-mm and netdev to come up with a better scheme.