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From: Djalal Harouni <tixxdz-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
To: Andy Lutomirski <luto-DgEjT+Ai2ygdnm+yROfE0A@public.gmane.org>
Cc: Kees Cook <keescook-F7+t8E8rja9g9hUCZPvPmw@public.gmane.org>,
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	"Serge E. Hallyn" <serge-A9i7LUbDfNHQT0dZR+AlfA@public.gmane.org>,
	"kernel-hardening-ZwoEplunGu1jrUoiu81ncdBPR1lH4CV8@public.gmane.org"
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	Jonathan Corbet <corbet-T1hC0tSOHrs@public.gmane.org>,
	Jessica Yu <jeyu-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org>,
	Rusty Russell <rusty-8n+1lVoiYb80n/F98K4Iww@public.gmane.org>,
	Arnaldo Carvalho de Melo
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	Mauro
Subject: Re: [PATCH v3 2/2] modules:capabilities: add a per-task modules autoload restriction
Date: Sat, 22 Apr 2017 03:19:55 +0200	[thread overview]
Message-ID: <CAEiveUeHk4TkfGbLzomDUB3WB7eV=ts_64BL3SDVvrCKkrPW=Q@mail.gmail.com> (raw)
In-Reply-To: <CAEiveUcx8fwQgXdLPeMNsTjX2KPhQKH__a-XzcHko_1aCmh4sg-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org>

On Sat, Apr 22, 2017 at 2:12 AM, Djalal Harouni <tixxdz-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org> wrote:
> On Sat, Apr 22, 2017 at 1:51 AM, Andy Lutomirski <luto-DgEjT+Ai2ygdnm+yROfE0A@public.gmane.org> wrote:
> [...]
>>>> I personally like my implicit_rights idea, and it might be interesting
>>>> to prototype it.
>>>
>>> I don't like blocking a needed feature behind a large super-feature
>>> that doesn't exist yet. We'd be able to refactor this code into using
>>> such a thing in the future, so I'd prefer to move ahead with this
>>> since it would stop actual exploits.
>>
>> I don't think the super-feature is so hard, and I think we should not
>> add the per-task thing the way it's done in this patch.  Let's not add
>> per-task things where the best argument for their security is "not
>> sure how it would be exploited".
>
> Actually the XFRM framework CVE-2017-7184 [1] is one real example, of
> course there are others. The exploit was used on a generic distro
> during a security contest that distro is Ubuntu. That distro will
> never provide a module autoloading restriction by default to not harm
> it's users. Consumers or containers/sandboxes then can run their
> confined apps using such facilities.
>
> These bugs will stay in embedded devices that use these generic
> distros for ever.

The DCCP CVE-2017-6074 exploit:
http://seclists.org/oss-sec/2017/q1/503

Well, pretty sure there is more... the bugs are real, as their
exploits. Anyway I think these features can coexist as they are
optional, and most process trees protections can get along by design.


-- 
tixxdz

  parent reply	other threads:[~2017-04-22  1:19 UTC|newest]

Thread overview: 38+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2017-04-19 22:20 [PATCH v3 0/2] modules:capabilities: automatic module loading restrictions Djalal Harouni
2017-04-19 22:20 ` [PATCH v3 1/2] modules:capabilities: automatic module loading restriction Djalal Harouni
2017-04-19 23:16   ` Andy Lutomirski
2017-04-20  2:22   ` Ben Hutchings
2017-04-20 12:44     ` [kernel-hardening] " Djalal Harouni
2017-04-20 15:02       ` Ben Hutchings
     [not found]         ` <1492700543.31767.23.camel-/+tVBieCtBitmTQ+vhA3Yw@public.gmane.org>
2017-04-20 20:39           ` [kernel-hardening] " Djalal Harouni
     [not found]             ` <CAEiveUdFL53XyQpacmN6f8F28M0bLQDcetpRXJjrJ10vDmQi8Q-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org>
2017-04-20 21:28               ` Kees Cook
2017-04-19 22:20 ` [PATCH v3 2/2] modules:capabilities: add a per-task modules autoload restriction Djalal Harouni
2017-04-19 23:15   ` Andy Lutomirski
2017-04-19 23:43     ` Kees Cook
2017-04-20  2:41       ` Andy Lutomirski
     [not found]         ` <CALCETrUueOx1tqj+Ru93KGpy2HHR-A_GQ6DrAppiomkPTtX7Lw-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org>
2017-04-21 23:19           ` Kees Cook
2017-04-21 23:28             ` Andy Lutomirski
2017-04-21 23:40               ` Kees Cook
2017-04-21 23:51                 ` Andy Lutomirski
2017-04-22  0:12                   ` Djalal Harouni
     [not found]                     ` <CAEiveUcx8fwQgXdLPeMNsTjX2KPhQKH__a-XzcHko_1aCmh4sg-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org>
2017-04-22  1:19                       ` Djalal Harouni [this message]
2017-04-22  6:51                       ` Andy Lutomirski
     [not found]                         ` <CALCETrUT73CcPQx2T=1zWbOUhw9r-c_YqXw5-KTwxgWPgXuTwA-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org>
2017-04-22 19:29                           ` Kees Cook
     [not found]                             ` <CAGXu5jLV+WZyj+xnxVFkFEgEthNt6eXdcSgHT-=85mJ1ECZ1Rw-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org>
2017-04-24 14:25                               ` Djalal Harouni
2017-04-24 18:02                                 ` Kees Cook
     [not found]                                   ` <CAGXu5jL_-cxidy_O4ORaN0iX9o7=hsi3DYTRvQs5w5363Z+MVg-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org>
2017-04-24 18:35                                     ` Djalal Harouni
2017-04-21 23:52               ` Casey Schaufler
2017-04-22  0:00                 ` Andy Lutomirski
2017-04-22  0:13                   ` Casey Schaufler
2017-04-22  6:45                     ` Andy Lutomirski
2017-04-22 12:17               ` Djalal Harouni
     [not found]                 ` <CAEiveUdbQcfn1xC5xWMv91vL_uR1MGTvARqw-E4GDTMUZ6t=bA-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org>
2017-05-04 13:07                   ` Djalal Harouni
2017-05-04 14:58                     ` Serge E. Hallyn
2017-05-05 13:06                       ` Djalal Harouni
2017-05-05 16:18                     ` Andy Lutomirski
2017-04-20  1:57   ` kbuild test robot
     [not found]   ` <1492640420-27345-3-git-send-email-tixxdz-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
2017-04-19 22:38     ` Djalal Harouni
2017-04-24  4:29     ` Rusty Russell
2017-04-26  9:06       ` Djalal Harouni
2017-04-27  2:07         ` Rusty Russell
     [not found]           ` <87k266hacq.fsf-8n+1lVoiYb80n/F98K4Iww@public.gmane.org>
2017-04-27 13:16             ` Djalal Harouni

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