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From: Richard Weinberger <richard-/L3Ra7n9ekc@public.gmane.org>
To: Yves-Alexis Perez
	<corsac-8fiUuRrzOP0dnm+yROfE0A@public.gmane.org>,
	"Serge E. Hallyn" <serge-A9i7LUbDfNHQT0dZR+AlfA@public.gmane.org>,
	Tobias Markus <tobias-gyUQdkDHmHmHXe+LvDLADg@public.gmane.org>
Cc: linux-kernel-u79uwXL29TY76Z2rM5mHXA@public.gmane.org,
	"Eric W. Biederman"
	<ebiederm-aS9lmoZGLiVWk0Htik3J/w@public.gmane.org>,
	Al Viro <viro-3bDd1+5oDREiFSDQTTA3OLVCufUGDwFn@public.gmane.org>,
	Serge Hallyn
	<serge.hallyn-Z7WLFzj8eWMS+FvcfC7Uqw@public.gmane.org>,
	Andrew Morton
	<akpm-hQyY1W1yCW8ekmWlsbkhG0B+6BGkLq7r@public.gmane.org>,
	Andy Lutomirski <luto-kltTT9wpgjJwATOyAt5JVQ@public.gmane.org>,
	Christoph Lameter <cl-vYTEC60ixJUAvxtiuMwx3w@public.gmane.org>,
	"Michael Kerrisk (man-pages)"
	<mtk.manpages-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>,
	linux-security-module-u79uwXL29TY76Z2rM5mHXA@public.gmane.org,
	linux-api-u79uwXL29TY76Z2rM5mHXA@public.gmane.org,
	linux-man-u79uwXL29TY76Z2rM5mHXA@public.gmane.org,
	Richard Weinberger
	<richard.weinberger-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
Subject: Re: [PATCH] userns/capability: Add user namespace capability
Date: Mon, 19 Oct 2015 14:48:04 +0200	[thread overview]
Message-ID: <5624E684.8000302@nod.at> (raw)
In-Reply-To: <1445258180.4099.18.camel-8fiUuRrzOP0dnm+yROfE0A@public.gmane.org>

Am 19.10.2015 um 14:36 schrieb Yves-Alexis Perez:
> On dim., 2015-10-18 at 20:41 -0500, Serge E. Hallyn wrote:
>> We shouldn't need a long-term solution.  Your concern is bugs.  After
>> some time surely we'll feel that we have achieved a stable solution?
> 
> But this is actually the whole point: we need a long term solution, because
> they will always be bug, whether in user namespaces or in others parts exposed
> by user namespaces. It's fine to fix them when we find them, but that still
> means they're exploitable even before we know about them. We still find bugs
> in code written years ago, it's quite certain there are bugs in current code.

You can replace the term "user namespace" with any other non-trivial kernel subsystem.
There will always be bugs.

Thanks,
//richard

WARNING: multiple messages have this Message-ID (diff)
From: Richard Weinberger <richard@nod.at>
To: Yves-Alexis Perez <corsac@debian.org>,
	"Serge E. Hallyn" <serge@hallyn.com>,
	Tobias Markus <tobias@miglix.eu>
Cc: linux-kernel@vger.kernel.org,
	"Eric W. Biederman" <ebiederm@xmission.com>,
	Al Viro <viro@ZenIV.linux.org.uk>,
	Serge Hallyn <serge.hallyn@canonical.com>,
	Andrew Morton <akpm@linuxfoundation.org>,
	Andy Lutomirski <luto@amacapital.net>,
	Christoph Lameter <cl@linux.com>,
	"Michael Kerrisk (man-pages)" <mtk.manpages@gmail.com>,
	linux-security-module@vger.kernel.org, linux-api@vger.kernel.org,
	linux-man@vger.kernel.org,
	Richard Weinberger <richard.weinberger@gmail.com>
Subject: Re: [PATCH] userns/capability: Add user namespace capability
Date: Mon, 19 Oct 2015 14:48:04 +0200	[thread overview]
Message-ID: <5624E684.8000302@nod.at> (raw)
In-Reply-To: <1445258180.4099.18.camel@debian.org>

Am 19.10.2015 um 14:36 schrieb Yves-Alexis Perez:
> On dim., 2015-10-18 at 20:41 -0500, Serge E. Hallyn wrote:
>> We shouldn't need a long-term solution.  Your concern is bugs.  After
>> some time surely we'll feel that we have achieved a stable solution?
> 
> But this is actually the whole point: we need a long term solution, because
> they will always be bug, whether in user namespaces or in others parts exposed
> by user namespaces. It's fine to fix them when we find them, but that still
> means they're exploitable even before we know about them. We still find bugs
> in code written years ago, it's quite certain there are bugs in current code.

You can replace the term "user namespace" with any other non-trivial kernel subsystem.
There will always be bugs.

Thanks,
//richard

  parent reply	other threads:[~2015-10-19 12:48 UTC|newest]

Thread overview: 41+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2015-10-17 15:58 [PATCH] userns/capability: Add user namespace capability Tobias Markus
2015-10-17 15:58 ` Tobias Markus
     [not found] ` <5622700C.9090107-gyUQdkDHmHmHXe+LvDLADg@public.gmane.org>
2015-10-17 20:17   ` Richard Weinberger
2015-10-17 20:17     ` Richard Weinberger
2015-10-18 20:13     ` Tobias Markus
     [not found]       ` <5623FD86.2030609-gyUQdkDHmHmHXe+LvDLADg@public.gmane.org>
2015-10-18 20:21         ` Richard Weinberger
2015-10-18 20:21           ` Richard Weinberger
     [not found]           ` <5623FF36.8080800-/L3Ra7n9ekc@public.gmane.org>
2015-10-18 20:41             ` Tobias Markus
2015-10-18 20:41               ` Tobias Markus
2015-10-18 20:48               ` Richard Weinberger
     [not found]                 ` <56240599.3050903-/L3Ra7n9ekc@public.gmane.org>
2015-10-18 21:49                   ` Tobias Markus
2015-10-18 21:49                     ` Tobias Markus
2015-10-18 22:06                     ` Richard Weinberger
2015-10-19  0:28         ` Mike Frysinger
2015-10-19  0:28           ` Mike Frysinger
2015-10-17 21:55   ` Serge E. Hallyn
2015-10-17 21:55     ` Serge E. Hallyn
     [not found]     ` <20151017215501.GA22900-7LNsyQBKDXoIagZqoN9o3w@public.gmane.org>
2015-10-18 20:13       ` Tobias Markus
2015-10-18 20:13         ` Tobias Markus
     [not found]         ` <5623FD82.4030902-gyUQdkDHmHmHXe+LvDLADg@public.gmane.org>
2015-10-19  1:41           ` Serge E. Hallyn
2015-10-19  1:41             ` Serge E. Hallyn
     [not found]             ` <20151019014112.GA1683-7LNsyQBKDXoIagZqoN9o3w@public.gmane.org>
2015-10-19 12:36               ` Yves-Alexis Perez
2015-10-19 12:36                 ` Yves-Alexis Perez
     [not found]                 ` <1445258180.4099.18.camel-8fiUuRrzOP0dnm+yROfE0A@public.gmane.org>
2015-10-19 12:48                   ` Richard Weinberger [this message]
2015-10-19 12:48                     ` Richard Weinberger
2015-10-22 20:45           ` Eric W. Biederman
2015-10-22 20:45             ` Eric W. Biederman
     [not found]             ` <87twpi63ai.fsf-JOvCrm2gF+uungPnsOpG7nhyD016LWXt@public.gmane.org>
2015-10-22 21:02               ` Andy Lutomirski
2015-10-22 21:02                 ` Andy Lutomirski
     [not found]                 ` <CALCETrWKN+Uzw_TYqVTGatNZ3LT5RbSM1WuYPoXeKQs9Yw_qjg-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org>
2015-10-22 21:44                   ` Eric W. Biederman
2015-10-22 21:44                   ` Eric W. Biederman
2015-10-22 21:44                     ` Eric W. Biederman
2015-10-22 21:02               ` Andy Lutomirski
2015-10-22 20:45           ` Eric W. Biederman
2015-10-19 14:24   ` Austin S Hemmelgarn
2015-10-19 14:24     ` Austin S Hemmelgarn
     [not found]     ` <5624FD3B.2050401-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
2015-10-21 18:53       ` Andy Lutomirski
2015-10-21 18:53         ` Andy Lutomirski
     [not found]         ` <CALCETrWfZ9hXvLPtJnZhU-ZdoUbYNo-QSydMPvP6Q7Rp0oCQaw-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org>
2015-10-21 19:13           ` Austin S Hemmelgarn
2015-10-21 19:13             ` Austin S Hemmelgarn
2015-10-22 17:10             ` Andy Lutomirski

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