linux-kernel - Re: [PATCH 1/4] userns: let clone_uts_ns() handle setting uts->user

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Message-ID: <20110221135803.GA15871@mail.hallyn.com>
Date:	Mon, 21 Feb 2011 13:58:03 +0000
From:	"Serge E. Hallyn" <serge@...lyn.com>
To:	Oleg Nesterov <oleg@...hat.com>
Cc:	Daniel Lezcano <daniel.lezcano@...e.fr>,
	"Serge E. Hallyn" <serge@...lyn.com>,
	Andrew Morton <akpm@...l.org>,
	LSM <linux-security-module@...r.kernel.org>,
	James Morris <jmorris@...ei.org>,
	Kees Cook <kees.cook@...onical.com>,
	containers@...ts.linux-foundation.org,
	kernel list <linux-kernel@...r.kernel.org>,
	"Eric W. Biederman" <ebiederm@...ssion.com>,
	Alexey Dobriyan <adobriyan@...il.com>,
	Michael Kerrisk <mtk.manpages@...il.com>, xemul@...allels.com,
	dhowells@...hat.com
Subject: Re: [PATCH 1/4] userns: let clone_uts_ns() handle setting
 uts->user_ns

Quoting Oleg Nesterov (oleg@...hat.com):
> On 02/21, Daniel Lezcano wrote:
> >
> > On 02/21/2011 05:01 AM, Serge E. Hallyn wrote:
> >> To do so we need to pass in the task_struct who'll get the utsname,
> >> so we can get its user_ns.
> >>
> >> -extern struct uts_namespace *copy_utsname(unsigned long flags,
> >> -					struct uts_namespace *ns);
> >> +extern struct uts_namespace *copy_utsname(struct task_struct *tsk,
> >> +					  unsigned long flags,
> >> +					  struct uts_namespace *ns);
> >
> > Why don't we pass 'user_ns' instead of 'tsk' ? that will look
> > semantically clearer for the caller no ?
> > (example below).
> > ...
> >
> > new_nsp->uts_ns = copy_utsname(flags, tsk->nsproxy->uts_ns, task_cred_xxx(tsk, user)->user_ns);
> 
> To me tsk looks more readable, I mean
> 
> 	new_nsp->uts_ns = copy_utsname(flags, tsk);
> 
> copy_utsname() can find both uts_ns and user_ns looking at task_strcut.

Uh, yeah.  I should remove the 'ns' argument there shouldn't I.

Daniel, does that sway your opinion then?

thanks,
-serge
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