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>
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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
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next prev parent 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
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