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

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Date:	Thu, 22 Oct 2009 18:03:42 -0700
From:	ebiederm@...ssion.com (Eric W. Biederman)
To:	Sukadev Bhattiprolu <sukadev@...ux.vnet.ibm.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

Sukadev Bhattiprolu <sukadev@...ux.vnet.ibm.com> writes:

> Eric W. Biederman [ebiederm@...ssion.com] wrote:
> | +static int set_pidmap(struct pid_namespace *pid_ns, int target)
> | +{
> | +	if (target >= pid_max)
> | +		return -1;
>
> I am changing this and the next return to 'return -EINVAL', to match
> an earlier patch in my patchset.
>
> | +	if (target < RESERVED_PIDS)
>
> Should we replace RESERVED_PIDS with 0 ? We currently allow new
> containers to have pids 1..32K in the first pass and in subsequent
> passes assign starting at RESERVED_PIDS.

If it is a preexisting namespace pid namespace removing the RESERVED_PIDS
check removes most if not all of the point of RESERVED_PIDS.

In a new fresh pid namespace I have no problem with not performing
the RESERVED_PIDS check.

So I guess that makes the check.

if ((target < RESERVED_PIDS) && pid_ns->last_pid >= RESERVED_PIDS)
   return -EINVAL;

Eric
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