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Date: Wed, 14 Feb 2018 18:50:29 +0100 From: Richard Weinberger <richard@...ma-star.at> To: Enrico Weigelt <lkml@...ux.net> Cc: Aleksa Sarai <asarai@...e.de>, Linux Containers <containers@...ts.linux-foundation.org>, "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org> Subject: Re: plan9 semantics on Linux - mount namespaces Am Mittwoch, 14. Februar 2018, 18:21:12 CET schrieb Enrico Weigelt: > On 14.02.2018 16:17, Richard Weinberger wrote: > > From taking a *very* quick look into busybox source, I suspect this > > should fix> > > it: > > > > diff --git a/util-linux/unshare.c b/util-linux/unshare.c > > index 875e3f86e304..3f59cf4d27c2 100644 > > --- a/util-linux/unshare.c > > +++ b/util-linux/unshare.c > > @@ -350,9 +350,9 @@ int unshare_main(int argc UNUSED_PARAM, char **argv) > > > > * in that user namespace. > > */ > > > > xopen_xwrite_close(PATH_PROC_SETGROUPS, "deny"); > > > > - sprintf(uidmap_buf, "%u 0 1", (unsigned)reuid); > > + sprintf(uidmap_buf, "0 %u 1", (unsigned)reuid); > > > > xopen_xwrite_close(PATH_PROC_UIDMAP, uidmap_buf); > > > > - sprintf(uidmap_buf, "%u 0 1", (unsigned)regid); > > + sprintf(uidmap_buf, "0 %u 1", (unsigned)regid); > > > > xopen_xwrite_close(PATH_PROC_GIDMAP, uidmap_buf); > > > > } else > > if (setgrp_str) { > > hmm, now it works, but only when strace'ing it. > that's really strange. On my box, with my patch applied, also busybox works now. > But still I wonder whether user_ns really solves my problem, as I don't > want to create sandboxed users, but only private namespaces just like > on Plan9. Well, I'd be surprised if that works out of the box. Since you're posting on LKML I assumed you're hacking the kernel to support plan9-alike namespaces... Thanks, //richard -- sigma star gmbh - Eduard-Bodem-Gasse 6 - 6020 Innsbruck - Austria ATU66964118 - FN 374287y
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