public inbox for passt-dev@passt.top
 help / color / mirror / code / Atom feed
From: David Gibson <david@gibson.dropbear.id.au>
To: passt-dev@passt.top
Subject: Re: [PATCH v2 10/10] Allow --userns when pasta spawns a command
Date: Sat, 10 Sep 2022 17:29:35 +1000	[thread overview]
Message-ID: <Yxw830V/uIMd1bzY@yekko> (raw)
In-Reply-To: <20220909163425.56e56c58@elisabeth>

[-- Attachment #1: Type: text/plain, Size: 1966 bytes --]

On Fri, Sep 09, 2022 at 04:34:25PM +0200, Stefano Brivio wrote:
> On Thu,  8 Sep 2022 13:59:07 +1000
> David Gibson <david(a)gibson.dropbear.id.au> wrote:
> 
> > Currently --userns is only allowed when pasta is attaching to an existing
> > netns or PID, and is prohibited when creating a new netns by spawning a
> > command or shell.
> > 
> > With the new handling of userns, this check isn't neccessary.  I'm not sure
> > if there's any use case for --userns with a spawned command, but it's
> > strictly more flexible and requires zero extra code, so we might as well.
> 
> I think it's helpful because one might not be able to join a network
> namespace without first joining a given user namespace.

Well.. this is strictly for the spawning command case, so we're
creating the network ns rather than joining one.

> So, if you want to run any network-ish command in such a network
> namespace, using pasta instead of nsenter for whatever reason, this
> possibility might be practical.
> 
> > Signed-off-by: David Gibson <david(a)gibson.dropbear.id.au>
> > ---
> >  conf.c | 5 -----
> >  1 file changed, 5 deletions(-)
> > 
> > diff --git a/conf.c b/conf.c
> > index 27d520e..ec191c2 100644
> > --- a/conf.c
> > +++ b/conf.c
> > @@ -561,11 +561,6 @@ static int conf_pasta_ns(int *netns_only, char *userns, char *netns,
> >  		}
> >  	}
> >  
> > -	if (*userns && !*netns) {
> > -		err("--userns requires --netns or PID");
> > -		return -EINVAL;
> > -	}
> 
> I guess we should now drop this sentence about --userns from the man
> page:
> 
>   This option requires --netns or a PID to be specified.
> 
> ...either drop it, or clarify that a command might also be given
> instead, I'm not sure.

Good point, I'll adjust.

-- 
David Gibson			| I'll have my music baroque, and my code
david AT gibson.dropbear.id.au	| minimalist, thank you.  NOT _the_ _other_
				| _way_ _around_!
http://www.ozlabs.org/~dgibson

[-- Attachment #2: signature.asc --]
[-- Type: application/pgp-signature, Size: 833 bytes --]

  reply	other threads:[~2022-09-10  7:29 UTC|newest]

Thread overview: 33+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2022-09-08  3:58 [PATCH v2 00/10] Clean up handling of userns David Gibson
2022-09-08  3:58 ` [PATCH v2 01/10] Don't store UID & GID persistently in the context structure David Gibson
2022-09-08  3:58 ` [PATCH v2 02/10] Split checking for root from dropping root privilege David Gibson
2022-09-09 14:33   ` Stefano Brivio
2022-09-10  7:09     ` David Gibson
2022-09-08  3:59 ` [PATCH v2 03/10] Consolidate determination of UID/GID to run as David Gibson
2022-09-09 14:33   ` Stefano Brivio
2022-09-10  7:15     ` David Gibson
2022-09-10 20:43       ` Stefano Brivio
2022-09-12  9:53         ` David Gibson
2022-09-13  3:49           ` Stefano Brivio
2022-09-13  5:20             ` David Gibson
2022-09-08  3:59 ` [PATCH v2 04/10] Safer handling if we can't open /proc/self/uid_map David Gibson
2022-09-09 14:33   ` Stefano Brivio
2022-09-10  7:23     ` David Gibson
2022-09-08  3:59 ` [PATCH v2 05/10] Move self-isolation code into a separate file David Gibson
2022-09-09 14:33   ` Stefano Brivio
2022-09-10  7:23     ` David Gibson
2022-09-10 20:43       ` Stefano Brivio
2022-09-08  3:59 ` [PATCH v2 06/10] Consolidate validation of pasta namespace options David Gibson
2022-09-08  3:59 ` [PATCH v2 07/10] Clean up and rename conf_ns_open() David Gibson
2022-09-08  3:59 ` [PATCH v2 08/10] Correctly handle --netns-only in pasta_start_ns() David Gibson
2022-09-09 14:34   ` Stefano Brivio
2022-09-10  7:25     ` David Gibson
2022-09-11  8:26       ` David Gibson
2022-09-13  3:50         ` Stefano Brivio
2022-09-08  3:59 ` [PATCH v2 09/10] Handle userns isolation and dropping root at the same time David Gibson
2022-09-08  3:59 ` [PATCH v2 10/10] Allow --userns when pasta spawns a command David Gibson
2022-09-09 14:34   ` Stefano Brivio
2022-09-10  7:29     ` David Gibson [this message]
2022-09-10 20:42       ` Stefano Brivio
2022-09-09 14:36 ` [PATCH v2 00/10] Clean up handling of userns Stefano Brivio
2022-09-10  7:30   ` David Gibson

Reply instructions:

You may reply publicly to this message via plain-text email
using any one of the following methods:

* Save the following mbox file, import it into your mail client,
  and reply-to-all from there: mbox

  Avoid top-posting and favor interleaved quoting:
  https://en.wikipedia.org/wiki/Posting_style#Interleaved_style

* Reply using the --to, --cc, and --in-reply-to
  switches of git-send-email(1):

  git send-email \
    --in-reply-to=Yxw830V/uIMd1bzY@yekko \
    --to=david@gibson.dropbear.id.au \
    --cc=passt-dev@passt.top \
    /path/to/YOUR_REPLY

  https://kernel.org/pub/software/scm/git/docs/git-send-email.html

* If your mail client supports setting the In-Reply-To header
  via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line before the message body.
Code repositories for project(s) associated with this public inbox

	https://passt.top/passt

This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for IMAP folder(s).