linux-kernel - Re: [RFC][PATCH 0/3] fork: Add the ability to create 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: <20111127162456.GA5674@redhat.com>
Date:	Sun, 27 Nov 2011 17:24:56 +0100
From:	Oleg Nesterov <oleg@...hat.com>
To:	Pedro Alves <pedro@...esourcery.com>
Cc:	Pavel Emelyanov <xemul@...allels.com>, Tejun Heo <tj@...nel.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Cyrill Gorcunov <gorcunov@...nvz.org>,
	James Bottomley <jbottomley@...allels.com>
Subject: Re: [RFC][PATCH 0/3] fork: Add the ability to create tasks
	with?given pids

On 11/25, Pedro Alves wrote:
>
> From the perspective of a client that is
> going to use this on a live system, CLONE_CHILD_USEPIDS seems a little better,
> in that the pid race is only against another task reusing the same pid,

Yes. Except you can't use on a live system at all. It simply doesn't
work after the first "normal" clone() without CLONE_CHILD_USEPIDS.

Although we can probably allow CLONE_CHILD_USEPIDS for CAP_SYS_ADMIN.

> while with setting last_pid, you have a try/whoops-not-the-pid-I-want/kill/retry/rinse/repeat/
> loop racing against all fork/clone's in the system,

Yes, setting last_pid can race with another fork(). I agree this
sucks. But simple ;)

Oleg.

--
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/