linux-kernel - Re: [REVIEW][PATCH 3/5] pidns: Don't have unshare(CLONE_NEWPID) imply CLONE

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] [day] [month] [year] [list]

Date:	Sun, 8 Sep 2013 19:00:01 +0200
From:	Oleg Nesterov <oleg@...hat.com>
To:	"Eric W. Biederman" <ebiederm@...ssion.com>
Cc:	Linux Containers <containers@...ts.linux-foundation.org>,
	"Serge E. Hallyn" <serge@...lyn.com>, linux-kernel@...r.kernel.org
Subject: Re: [REVIEW][PATCH 3/5] pidns: Don't have unshare(CLONE_NEWPID)
	imply CLONE_THREAD

Sorry for delay, vacation.

On 08/29, Eric W. Biederman wrote:
>
> I goofed when I made unshare(CLONE_NEWPID) only work in a
> single-threaded process.  There is no need for that requirement and in
> fact I analyzied things right for setns.  The hard requirement
> is for tasks that share a VM to all be in the pid namespace and
> we properly prevent that in do_fork.

Yes, agreed, with the current meaning of ->pid_ns unshare(NEWPID)
looks safe even if the caller is multi-threaded... and this matches
pidns_install() which doesn't require single-threaded.

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/