Groups | Search | Server Info | Keyboard shortcuts | Login | Register [http] [https] [nntp] [nntps]

Groups > linux.kernel > #1250228

Re: [PATCH] userns/capability: Add user namespace capability

Show all headers | View raw

On 17.10.2015 22:17, Richard Weinberger wrote:
> On Sat, Oct 17, 2015 at 5:58 PM, Tobias Markus <tobias@miglix.eu> wrote:
>> One question remains though: Does this break userspace executables that
>> expect being able to create user namespaces without priviledge? Since
>> creating user namespaces without CAP_SYS_ADMIN was not possible before
>> Linux 3.8, programs should already expect a potential EPERM upon calling
>> clone. Since creating a user namespace without CAP_SYS_USER_NS would
>> also cause EPERM, we should be on the safe side.
> 
> In case of doubt, yes it will break existing software.
> Hiding user namespaces behind CAP_SYS_USER_NS will not magically
> make them secure.
> 
The goal is not to make user namespaces secure, but to limit access to
them somewhat in order to reduce the potential attack surface.
Please see my reply to Serge for further details.
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@vger.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/

Back to linux.kernel | Previous | Next — Previous in thread | Next in thread | Find similar | Unroll thread

Thread

[PATCH] userns/capability: Add user namespace capability Tobias Markus <tobias@miglix.eu> - 2015-10-17 18:10 +0200
  Re: [PATCH] userns/capability: Add user namespace capability Richard Weinberger <richard.weinberger@gmail.com> - 2015-10-17 22:20 +0200
    Re: [PATCH] userns/capability: Add user namespace capability Tobias Markus <tobias@miglix.eu> - 2015-10-18 22:20 +0200
      Re: [PATCH] userns/capability: Add user namespace capability Richard Weinberger <richard@nod.at> - 2015-10-18 22:30 +0200
        Re: [PATCH] userns/capability: Add user namespace capability Tobias Markus <tobias@miglix.eu> - 2015-10-18 22:50 +0200
          Re: [PATCH] userns/capability: Add user namespace capability Richard Weinberger <richard@nod.at> - 2015-10-18 22:50 +0200
            Re: [PATCH] userns/capability: Add user namespace capability Tobias Markus <tobias@miglix.eu> - 2015-10-19 00:00 +0200
              Re: [PATCH] userns/capability: Add user namespace capability Richard Weinberger <richard@nod.at> - 2015-10-19 00:10 +0200
      Re: [PATCH] userns/capability: Add user namespace capability Mike Frysinger <vapier@gentoo.org> - 2015-10-19 02:30 +0200
  Re: [PATCH] userns/capability: Add user namespace capability "Serge E. Hallyn" <serge@hallyn.com> - 2015-10-18 00:00 +0200
    Re: [PATCH] userns/capability: Add user namespace capability Tobias Markus <tobias@miglix.eu> - 2015-10-18 22:20 +0200
      Re: [PATCH] userns/capability: Add user namespace capability "Serge E. Hallyn" <serge@hallyn.com> - 2015-10-19 03:50 +0200
        Re: [PATCH] userns/capability: Add user namespace capability Yves-Alexis Perez <corsac@debian.org> - 2015-10-19 14:40 +0200
          Re: [PATCH] userns/capability: Add user namespace capability Richard Weinberger <richard@nod.at> - 2015-10-19 14:50 +0200
      Re: [PATCH] userns/capability: Add user namespace capability ebiederm@xmission.com (Eric W. Biederman) - 2015-10-22 23:00 +0200
        Re: [PATCH] userns/capability: Add user namespace capability Andy Lutomirski <luto@amacapital.net> - 2015-10-22 23:10 +0200
          Re: [PATCH] userns/capability: Add user namespace capability ebiederm@xmission.com (Eric W. Biederman) - 2015-10-23 00:00 +0200
  Re: [PATCH] userns/capability: Add user namespace capability Austin S Hemmelgarn <ahferroin7@gmail.com> - 2015-10-19 16:30 +0200
    Re: [PATCH] userns/capability: Add user namespace capability Andy Lutomirski <luto@amacapital.net> - 2015-10-21 21:00 +0200
      Re: [PATCH] userns/capability: Add user namespace capability Austin S Hemmelgarn <ahferroin7@gmail.com> - 2015-10-21 21:20 +0200
        Re: [PATCH] userns/capability: Add user namespace capability Andy Lutomirski <luto@amacapital.net> - 2015-10-22 19:20 +0200

csiph-web