On Sat, Jan 30, 2016 at 04:31:06PM +0300, Yuriy M. Kaminskiy wrote:
> >> + case 0: /* child */
> >> + do {
> >> + /* wait until parent unshare() */
> >> + ino_t new_ino = get_mnt_ino(ppid);
> >> + if (ino != new_ino)
> >> + break;
> >> + } while (1);
> >
> > Racing? Suppose, parent died (e.g. unshare(2) failed), (parent) process
> > was reaped, new (unrelated) process was created with same pid, as a
> > result this function will bind namespaces from wrong process.
>
> ... besides, this is a busyloop, if "imposer process" is in same mnt
> namespace as original process, it will occupy CPU forever (and this *is*
Would be possible to use any lightweight solution rather than
pipe()+read/write(), for example use sigtimedwait() in child and
kill() in parent?
The ideal solution would be to have /proc/self/ns/<name> files poll()-able.
Karel
--
Karel Zak <kzak@xxxxxxxxxx>
http://karelzak.blogspot.com
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