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.

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.


--mtx

--
Enrico Weigelt, metux IT consult
Free software and Linux embedded engineering
i...@metux.net -- +49-151-27565287

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