* Re: [PATCH v2 08/20] randstruct: Whitelist NIU struct page overloading
[not found] ` <20170528081541.GE22193@infradead.org>
@ 2017-05-28 17:37 ` Kees Cook
0 siblings, 0 replies; only message in thread
From: Kees Cook @ 2017-05-28 17:37 UTC (permalink / raw)
To: Christoph Hellwig, Linux-MM, Network Development
Cc: kernel-hardening, David S . Miller, Laura Abbott, x86, LKML
[trying again with correct linux-mm address...]
On Sun, May 28, 2017 at 1:15 AM, Christoph Hellwig <hch@infradead.org> wrote:
> 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@davemloft.net>
>> Signed-off-by: Kees Cook <keescook@chromium.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.
Added to To. :) I couldn't understand why it was doing what it was
doing, hence the whitelist entry.
-Kees
--
Kees Cook
Pixel Security
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