netdev - Re: [RFC][PATCH] ns: Syscalls for better namespace sharing control.

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: <4B86EC45.3060005@free.fr>
Date:	Thu, 25 Feb 2010 22:31:49 +0100
From:	Daniel Lezcano <daniel.lezcano@...e.fr>
To:	"Eric W. Biederman" <ebiederm@...ssion.com>
CC:	hadi@...erus.ca, Linux Netdev List <netdev@...r.kernel.org>,
	containers@...ts.linux-foundation.org,
	Netfilter Development Mailinglist 
	<netfilter-devel@...r.kernel.org>,
	Ben Greear <greearb@...delatech.com>,
	Daniel Lezcano <dlezcano@...ibm.com>
Subject: Re: [RFC][PATCH] ns: Syscalls for better namespace sharing control.

Eric W. Biederman wrote:
> Introduce two new system calls:
> int nsfd(pid_t pid, unsigned long nstype);
> int setns(unsigned long nstype, int fd);
>
> These two new system calls address three specific problems that can
> make namespaces hard to work with.
> - Namespaces require a dedicated process to pin them in memory.
> - It is not possible to use a namespace unless you are the
>   child of the original creator.
> - Namespaces don't have names that userspace can use to talk
>   about them.
>
> The nsfd() system call returns a file descriptor that can
> be used to talk about a specific namespace, and to keep
> the specified namespace alive.
>
> The fd returned by nsfd() can be bind mounted as:
> mount --bind /proc/self/fd/N /some/filesystem/path
> to keep the namespace alive indefinitely as long as
> it is mounted.
>
> open works on the fd returned by nsfd() so another
> process can get a hold of it and do interesting things.
>
> Overall that allows for persistent naming of namespaces
> according to userspace policy.
>
> setns() allows changing the namespace of the current process
> to a namespace that originates with nsfd().
>
> Signed-off-by: Eric W. Biederman <ebiederm@...ssion.com>
> ---
>   

Is it planned to support all the namespaces for 'nsfd' ?
 I mean will it be possible to specify an Or'ed combination of nstype to 
grab a reference for several namespaces at a time of the targeted process ?

for example : nsfd( 1234, NSTYPE_NET | NSTYPE_IPC, NSTYPE_MNT)
--
To unsubscribe from this list: send the line "unsubscribe netdev" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html