linux-kernel - Re: [PATCH 2/2] user namespaces: require cap_set{ug}id for CLONE

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite for Android: free password hash cracker in your pocket

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Date:	Fri, 05 Dec 2008 09:17:09 -0800
From:	ebiederm@...ssion.com (Eric W. Biederman)
To:	"Serge E. Hallyn" <serue@...ibm.com>
Cc:	lkml <linux-kernel@...r.kernel.org>,
	David Howells <dhowells@...hat.com>,
	Michael Kerrisk <mtk.manpages@...il.com>,
	Dhaval Giani <dhaval@...ux.vnet.ibm.com>,
	James Morris <jmorris@...ei.org>
Subject: Re: [PATCH 2/2] user namespaces: require cap_set{ug}id for CLONE_NEWUSER

"Serge E. Hallyn" <serue@...ibm.com> writes:

>> Personally the user namespace only becomes interesting when we
>> start to be able to move in the other direction and remove the
>> set of capabilities requires to create it.
>> 
>> Eric
>
> Agreed.  Now the thing is I don't think we need full userns
> support to get there.  We just need the targeted capabilities
> and the basic dummy fs support - that is, init_user_ns owns
> all vfsmounts, and anyone not in init_user_ns only gets
> user other access to files under those mounts.

Right.

> Of course complete support for targeted caps will in itself
> be a huge effort :)
>
> So my roadmap is: next address the per-user keyring, then
> the targeted caps.

Sounds good.

I expect this means we will pass through a period where the user
namespace is less useful than it is today.  But as it will be on
a much firmer foundation that is fine.

Eric

--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/