linux-kernel - Re: [RFC][v8][PATCH 0/10] Implement clone3() system call

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Message-ID: <20091024033839.GA16430@us.ibm.com>
Date:	Fri, 23 Oct 2009 20:38:39 -0700
From:	Sukadev Bhattiprolu <sukadev@...ux.vnet.ibm.com>
To:	"Eric W. Biederman" <ebiederm@...ssion.com>
Cc:	Matt Helsley <matthltc@...ibm.com>,
	Oren Laadan <orenl@...rato.com>,
	Daniel Lezcano <daniel.lezcano@...e.fr>,
	randy.dunlap@...cle.com, arnd@...db.de, linux-api@...r.kernel.org,
	Containers <containers@...ts.linux-foundation.org>,
	Nathan Lynch <nathanl@...tin.ibm.com>,
	linux-kernel@...r.kernel.org, Louis.Rilling@...labs.com,
	kosaki.motohiro@...fujitsu.com, hpa@...or.com, mingo@...e.hu,
	torvalds@...ux-foundation.org,
	Alexey Dobriyan <adobriyan@...il.com>, roland@...hat.com,
	Pavel Emelyanov <xemul@...nvz.org>
Subject: Re: [RFC][v8][PATCH 0/10] Implement clone3() system call

Eric W. Biederman [ebiederm@...ssion.com] wrote:
| > +static int set_pidmap(struct pid_namespace *pid_ns, int target)
| > +{
| > +	if (!target)
| > +		return alloc_pidmap(pid_ns);

BTW,  we need this now that the RESERVED_PIDS check is is conditional on
->last_pid. But this makes set_pidmap() completely general so should we
have alloc_pid() call set_pidmap() always ? Or we could move this check
into alloc_pid(), but it may be better to have all values of 'target'
checked in one place.

| > +
| > +	if (target >= pid_max)
| > +		return -EINVAL;
| > +
| > +	if ((target < 0) || (target < RESERVED_PIDS && pid_ns == &init_pid_ns))
| > +		return -EINVAL;
| 
| if ((target < 0) || ((target < RESERVED_PIDS) && (pid_ns->last_pid >= RESERVED_PIDS)))
| 
| Please.

Ok.
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