linux-kernel - Re: [kernel-hardening] Re: [PATCH 9/9] mm: SLUB hardened usercopy support

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Date:	Sat, 9 Jul 2016 10:07:34 -0700
From:	Kees Cook <keescook@...omium.org>
To:	Valdis Kletnieks <Valdis.Kletnieks@...edu>
Cc:	"kernel-hardening@...ts.openwall.com" 
	<kernel-hardening@...ts.openwall.com>,
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	<linux-arm-kernel@...ts.infradead.org>
Subject: Re: [kernel-hardening] Re: [PATCH 9/9] mm: SLUB hardened usercopy support

On Fri, Jul 8, 2016 at 11:17 PM,  <Valdis.Kletnieks@...edu> wrote:
> Yeah, 'ping' dies with a similar traceback going to rawv6_setsockopt(),
> and 'trinity' dies a horrid death during initialization because it creates
> some sctp sockets to fool around with.  The problem in all these cases is that
> setsockopt uses copy_from_user() to pull in the option value, and the allocation
> isn't tagged with USERCOPY to whitelist it.

Just a note to clear up confusion: this series doesn't include the
whitelist protection, so this appears to be either bugs in the slub
checker or bugs in the code using the cfq_io_cq cache. I suspect the
former. :)

-Kees

-- 
Kees Cook
Chrome OS & Brillo Security