linux-kernel - Re: [REVIEW][PATCH v2] mm: Add a user_ns owner to mm

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Message-ID: <8760odnrf5.fsf@xmission.com>
Date:   Thu, 27 Oct 2016 21:22:38 -0500
From:   ebiederm@...ssion.com (Eric W. Biederman)
To:     Cyrill Gorcunov <gorcunov@...il.com>
Cc:     Kees Cook <keescook@...omium.org>,
        Andrey Vagin <avagin@...tuozzo.com>,
        LKML <linux-kernel@...r.kernel.org>,
        Pavel Emelyanov <xemul@...tuozzo.com>,
        Linux Containers <containers@...ts.linux-foundation.org>,
        Jann Horn <jann@...jh.net>
Subject: Re: [REVIEW][PATCH v2] mm: Add a user_ns owner to mm_struct and fix ptrace permission checks

Cyrill Gorcunov <gorcunov@...il.com> writes:

> On Fri, Oct 28, 2016 at 12:39:18AM +0300, Cyrill Gorcunov wrote:
>> On Thu, Oct 27, 2016 at 10:54:34AM -0500, Eric W. Biederman wrote:
>> > 
>> > 
>> > I can't imagine either of these changes making a practical difference
>> > to anyone but I am calling them out in case someone can.
>> > 
>> >  include/linux/mm_types.h |  1 +
>> >  kernel/fork.c            |  9 ++++++---
>> >  kernel/ptrace.c          | 26 +++++++++++---------------
>> >  mm/init-mm.c             |  2 ++
>> >  4 files changed, 20 insertions(+), 18 deletions(-)
>> 
>> Thanks a huge, Eric! And really sorry for delay in response,
>> I managed to miss this quite important mail for me in mail
>> storm. Gonna test it and will write you the results. Overall looks
>> great, but better be sure and run the tests.
>> 
>> Reviewed-by: Cyrill Gorcunov <gorcunov@...nvz.org>
>
> Eric, on which kernel the patch is on top of?
> It doesn't apply on linux-next for some reason.
>
>  | Date:   Thu Oct 27 14:21:59 2016 +1100
>  | 
>  |     Add linux-next specific files for 20161027
>  |     
>  |     Signed-off-by: Stephen Rothwell <sfr@...b.auug.org.au>
>
> I applied it on Linus' master and tests passed fine
> (but they were passing fine even without the patch,
>  only linux-next failed).

Odd.  I don't think I have taken the old version out of
linux-next yet.   So you can probably revert the old version out of
linux-next and apply this one.  All of my development at this point is
against v4.9-rc1.

I suspect you will find my last version on top of against v4.9-rc1 will
pass.  Since my tree is only one deep and I don't think anyone except
linux-next is based on it, I plan to drop and readd this patch.
Especially since it is candidate for backporting.

Eric