From: Andy Lutomirski <luto@amacapital.net>
To: Kees Cook <keescook@chromium.org>
Cc: Djalal Harouni <tixxdz@gmail.com>,
Linux API <linux-api@vger.kernel.org>,
"kernel-hardening@lists.openwall.com"
<kernel-hardening@lists.openwall.com>,
"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
Andrew Morton <akpm@linux-foundation.org>,
Lafcadio Wluiki <wluikil@gmail.com>
Subject: Re: [PATCH v4 2/2] procfs/tasks: add a simple per-task procfs hidepid= field
Date: Mon, 13 Feb 2017 11:01:44 -0800 [thread overview]
Message-ID: <CALCETrWNY9Ea=3dKksFJjizoH5eZbVOFWFnWoJrCRwP0R1QWHg@mail.gmail.com> (raw)
In-Reply-To: <CAGXu5jKz5vo3NwKb_JmNyWDCP0izK=sxTL6Dx_KmYX=1NK+icA@mail.gmail.com>
On Fri, Feb 10, 2017 at 3:44 PM, Kees Cook <keescook@chromium.org> wrote:
> On Wed, Jan 18, 2017 at 3:35 PM, Andy Lutomirski <luto@amacapital.net> wrote:
>> On Wed, Jan 18, 2017 at 2:50 PM, Djalal Harouni <tixxdz@gmail.com> wrote:
>>> Andy I don't follow here, no_new_privs is never cleared right ? I
>>> can't see the corresponding clear bit code for it.
>>
>> I believe that unsharing userns clears no_new_privs.
>
> Seriously? That's kind of ... weird. I mean, I guess you're
> priv-confined in a way, but that seems fragile.
>
I appear to have made this up. Either I genuinely pulled it out of
thin air or it was discussed and not done.
$ setpriv --nnp unshare -Ur cat /proc/self/status |grep NoNewPrivs
NoNewPrivs: 1
If it were to be done, it ought to be quite safe except for possible LSM issues.
--Andy
WARNING: multiple messages have this Message-ID (diff)
From: Andy Lutomirski <luto@amacapital.net>
To: Kees Cook <keescook@chromium.org>
Cc: Djalal Harouni <tixxdz@gmail.com>,
Linux API <linux-api@vger.kernel.org>,
"kernel-hardening@lists.openwall.com"
<kernel-hardening@lists.openwall.com>,
"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
Andrew Morton <akpm@linux-foundation.org>,
Lafcadio Wluiki <wluikil@gmail.com>
Subject: [kernel-hardening] Re: [PATCH v4 2/2] procfs/tasks: add a simple per-task procfs hidepid= field
Date: Mon, 13 Feb 2017 11:01:44 -0800 [thread overview]
Message-ID: <CALCETrWNY9Ea=3dKksFJjizoH5eZbVOFWFnWoJrCRwP0R1QWHg@mail.gmail.com> (raw)
In-Reply-To: <CAGXu5jKz5vo3NwKb_JmNyWDCP0izK=sxTL6Dx_KmYX=1NK+icA@mail.gmail.com>
On Fri, Feb 10, 2017 at 3:44 PM, Kees Cook <keescook@chromium.org> wrote:
> On Wed, Jan 18, 2017 at 3:35 PM, Andy Lutomirski <luto@amacapital.net> wrote:
>> On Wed, Jan 18, 2017 at 2:50 PM, Djalal Harouni <tixxdz@gmail.com> wrote:
>>> Andy I don't follow here, no_new_privs is never cleared right ? I
>>> can't see the corresponding clear bit code for it.
>>
>> I believe that unsharing userns clears no_new_privs.
>
> Seriously? That's kind of ... weird. I mean, I guess you're
> priv-confined in a way, but that seems fragile.
>
I appear to have made this up. Either I genuinely pulled it out of
thin air or it was discussed and not done.
$ setpriv --nnp unshare -Ur cat /proc/self/status |grep NoNewPrivs
NoNewPrivs: 1
If it were to be done, it ought to be quite safe except for possible LSM issues.
--Andy
next prev parent reply other threads:[~2017-02-13 19:02 UTC|newest]
Thread overview: 68+ messages / expand[flat|nested] mbox.gz Atom feed top
2017-01-16 13:23 [PATCH v4 0/2] procfs/tasks: introduce per-task procfs hidepid= field Djalal Harouni
2017-01-16 13:23 ` [kernel-hardening] " Djalal Harouni
2017-01-16 13:23 ` [PATCH v4 1/2] procfs: use an enum for possible hidepid values Djalal Harouni
2017-01-16 13:23 ` [kernel-hardening] " Djalal Harouni
2017-02-13 22:16 ` Kees Cook
2017-02-13 22:16 ` [kernel-hardening] " Kees Cook
2017-02-15 0:34 ` Andrew Morton
2017-02-15 0:34 ` [kernel-hardening] " Andrew Morton
2017-02-15 8:56 ` Djalal Harouni
2017-02-15 8:56 ` [kernel-hardening] " Djalal Harouni
2017-01-16 13:23 ` [PATCH v4 2/2] procfs/tasks: add a simple per-task procfs hidepid= field Djalal Harouni
2017-01-16 13:23 ` [kernel-hardening] " Djalal Harouni
2017-01-16 17:12 ` Djalal Harouni
2017-01-16 17:12 ` [kernel-hardening] " Djalal Harouni
[not found] ` <1484572984-13388-3-git-send-email-djalal-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
2017-01-16 17:15 ` Djalal Harouni
[not found] ` <CAEiveUfDvSoW9Hy2Y_uxU2YQ+vR8OvXMqRhxAANTGG7QaQbJeg-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org>
2017-01-17 20:33 ` Andy Lutomirski
2017-01-18 22:50 ` Djalal Harouni
2017-01-18 22:50 ` [kernel-hardening] " Djalal Harouni
2017-01-18 23:35 ` Andy Lutomirski
2017-01-18 23:35 ` [kernel-hardening] " Andy Lutomirski
2017-01-18 23:35 ` Andy Lutomirski
2017-01-19 13:53 ` Djalal Harouni
2017-01-19 13:53 ` [kernel-hardening] " Djalal Harouni
2017-01-19 13:53 ` Djalal Harouni
2017-01-19 19:52 ` Andy Lutomirski
2017-01-19 19:52 ` [kernel-hardening] " Andy Lutomirski
2017-01-19 19:52 ` Andy Lutomirski
2017-01-20 15:56 ` Lafcadio Wluiki
2017-01-20 15:56 ` [kernel-hardening] " Lafcadio Wluiki
2017-01-20 15:56 ` Lafcadio Wluiki
2017-01-20 16:33 ` Djalal Harouni
2017-01-20 16:33 ` [kernel-hardening] " Djalal Harouni
2017-01-20 16:33 ` Djalal Harouni
2017-01-21 0:53 ` Andy Lutomirski
2017-01-21 0:53 ` [kernel-hardening] " Andy Lutomirski
2017-01-21 0:53 ` Andy Lutomirski
2017-01-23 11:46 ` Djalal Harouni
2017-01-23 11:46 ` [kernel-hardening] " Djalal Harouni
2017-01-23 11:46 ` Djalal Harouni
2017-01-23 20:07 ` Andy Lutomirski
2017-01-23 20:07 ` [kernel-hardening] " Andy Lutomirski
2017-01-23 20:07 ` Andy Lutomirski
2017-01-26 13:20 ` Djalal Harouni
2017-01-26 13:20 ` [kernel-hardening] " Djalal Harouni
2017-01-26 13:20 ` Djalal Harouni
2017-02-10 14:40 ` Lafcadio Wluiki
2017-02-10 14:40 ` [kernel-hardening] " Lafcadio Wluiki
2017-02-10 14:40 ` Lafcadio Wluiki
2017-02-10 16:18 ` Andy Lutomirski
2017-02-10 16:18 ` [kernel-hardening] " Andy Lutomirski
2017-02-10 16:18 ` Andy Lutomirski
2017-01-20 15:44 ` Lafcadio Wluiki
2017-01-20 15:44 ` [kernel-hardening] " Lafcadio Wluiki
2017-01-20 15:44 ` Lafcadio Wluiki
2017-02-10 23:44 ` Kees Cook
2017-02-10 23:44 ` [kernel-hardening] " Kees Cook
2017-02-10 23:44 ` Kees Cook
2017-02-13 19:01 ` Andy Lutomirski [this message]
2017-02-13 19:01 ` [kernel-hardening] " Andy Lutomirski
2017-02-13 19:01 ` Andy Lutomirski
2017-02-13 19:15 ` Kees Cook
2017-02-13 19:15 ` [kernel-hardening] " Kees Cook
2017-02-13 19:15 ` Kees Cook
2017-02-14 4:11 ` Christian Kujau
2017-02-14 4:11 ` [kernel-hardening] " Christian Kujau
2017-02-14 4:11 ` Christian Kujau
2017-01-16 18:24 ` [kernel-hardening] " Daniel Micay
2017-01-17 9:54 ` Lafcadio Wluiki
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