linux-kernel - Re: [PATCH 3/3] pids: Make it possible to clone tasks with given pids

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: Windows password security audit tool. GUI, reports in PDF.

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

Message-ID: <20111110173009.GH27258@google.com>
Date:	Thu, 10 Nov 2011 09:30:09 -0800
From:	Tejun Heo <tj@...nel.org>
To:	Pavel Emelyanov <xemul@...allels.com>
Cc:	Andrew Morton <akpm@...ux-foundation.org>,
	Cyrill Gorcunov <gorcunov@...nvz.org>,
	Glauber Costa <glommer@...allels.com>,
	Nathan Lynch <ntl@...ox.com>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Oleg Nesterov <oleg@...hat.com>,
	Serge Hallyn <serue@...ibm.com>,
	Daniel Lezcano <dlezcano@...ibm.com>
Subject: Re: [PATCH 3/3] pids: Make it possible to clone tasks with given
 pids

Hello, Pavel.

>  	for (i = ns->level; i >= 0; i--) {
> -		nr = alloc_pidmap(tmp);
> +		nr = 0;
> +		if (unlikely(want_pids != NULL)) {
> +			if (get_user(nr, want_pids)) {
> +				nr = -EFAULT;
> +				goto out_free;
> +			}
> +
> +			if (nr != 0) {
> +				want_pids++;
> +				nr = set_pidmap(tmp, nr);
> +			} else
> +				want_pids = NULL; /* optimize above */
> +		}
> +		if (nr == 0)
> +			nr = alloc_pidmap(tmp);

Hmmm... is it necessary to be able to replicate pids on all
namespaces?  Also, isn't it a bit weird to be able to request PIDs in
the namespaces which is beyond the task which requested cloning?

Thanks.

-- 
tejun
--
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/