From: Anthony PERARD <anthony.perard@citrix.com>
To: George Dunlap <dunlapg@umich.edu>
Cc: Stefano Stabellini <sstabellini@kernel.org>,
Wei Liu <wei.liu2@citrix.com>,
Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>,
Andrew Cooper <andrew.cooper3@citrix.com>,
Tim Deegan <tim@xen.org>,
Ross Lagerwall <ross.lagerwall@citrix.com>,
Julien Grall <julien.grall@arm.com>,
Jan Beulich <jbeulich@suse.com>,
xen-devel <xen-devel@lists.xenproject.org>,
Ian Jackson <ian.jackson@citrix.com>
Subject: Re: [PATCH v2 1/6] docs/qemu-deprivilege: Revise and update with status and future plans
Date: Fri, 28 Sep 2018 13:59:08 +0100 [thread overview]
Message-ID: <20180928125908.GF2244@perard.uk.xensource.com> (raw)
In-Reply-To: <CAFLBxZaoFcpAc+NKmDoN3f37EiPNXC41tTgNRQ-9bam04waryQ@mail.gmail.com>
On Fri, Sep 28, 2018 at 12:37:22PM +0100, George Dunlap wrote:
> On Tue, Sep 25, 2018 at 12:20 PM Anthony PERARD
> <anthony.perard@citrix.com> wrote:
> >
> > On Fri, Sep 21, 2018 at 06:04:23PM +0100, George Dunlap wrote:
> > > +## Migration
> > > +
> > > +When calling xen-save-devices-state, since QEMU is running in a chroot
> > > +it is not useful to pass a filename (it doesn't even have write access
> > > +inside the chroot). Instead, give it an open fd using the add-fd
> > > +mechanism.
> >
> > That describe an issue only on save. The restore part of a migration
> > also have an issue:
> >
> > On restore, QEMU signal to libxl that it is ready only after priviledge
> > restriction have been put in place (and after or when it receive the
> > migration data). But xenstore isn't available anymore, so restore fails
> > from libxl point-of-view.
> >
> >
> > Or maybe you describe here an issue that would arise when an hypothetic
> > chroot is apply. But the migration issue describe here still apply
> > without chroot and with only -runas, the path libxl give to QEMU is
> > accessible by root only.
>
> Do our other restrictions -- chroot, deprivilege, &c -- all work on
> restore at the moment?
chroot isn't an issue for restore. But running QEMU as non-root user is
currently an issue for restore.
I think the only issue with restore that doesn't also exist when
creating a guest is restricted access to xenstore.
--
Anthony PERARD
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prev parent reply other threads:[~2018-09-28 12:59 UTC|newest]
Thread overview: 39+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-09-21 17:04 [PATCH v2 1/6] docs/qemu-deprivilege: Revise and update with status and future plans George Dunlap
2018-09-21 17:04 ` [PATCH v2 2/6] test/depriv: Add a tool to check process-level depriv George Dunlap
2018-09-24 10:57 ` Ian Jackson
2018-09-24 14:45 ` George Dunlap
2018-09-24 11:14 ` Anthony PERARD
2018-09-21 17:04 ` [PATCH v2 3/6] tools/dm_restrict: Ask QEMU to chroot George Dunlap
2018-09-24 8:20 ` Paul Durrant
2018-09-24 9:50 ` George Dunlap
2018-09-24 9:52 ` Paul Durrant
2018-09-24 10:31 ` Ian Jackson
2018-09-21 17:04 ` [PATCH v2 4/6] tools/dm_restrict: Unshare mount and IPC namespaces on Linux George Dunlap
2018-09-24 8:24 ` Paul Durrant
2018-09-24 10:40 ` Ian Jackson
2018-09-24 14:22 ` George Dunlap
2018-09-25 10:55 ` Ian Jackson
2018-09-21 17:04 ` [PATCH v2 5/6] tools/dm_depriv: Add first cut RLIMITs George Dunlap
2018-09-24 8:34 ` Paul Durrant
[not found] ` <CAFLBxZanne777R0WfJLuGqTv3dx=A+W0Z5UsW9B0i4MFMWWKXw@mail.gmail.com>
2018-10-05 15:18 ` George Dunlap
2018-09-24 10:48 ` Ian Jackson
2018-09-24 14:41 ` George Dunlap
2018-09-25 11:03 ` Ian Jackson
2018-09-21 17:04 ` [PATCH v2 6/6] RFC: tools/dm_restrict: Enable QEMU sandboxing George Dunlap
2018-09-24 10:49 ` Ian Jackson
2018-09-24 11:16 ` George Dunlap
2018-09-24 13:04 ` Ian Jackson
2018-09-24 13:43 ` George Dunlap
2018-09-25 10:46 ` Ian Jackson
2018-09-24 11:21 ` Ian Jackson
2018-09-24 14:28 ` George Dunlap
2018-09-25 11:02 ` Ian Jackson
2018-09-25 14:24 ` George Dunlap
2018-09-26 10:57 ` Ian Jackson
2018-09-24 8:14 ` [PATCH v2 1/6] docs/qemu-deprivilege: Revise and update with status and future plans Paul Durrant
2018-09-24 10:23 ` Ian Jackson
2018-09-24 13:08 ` George Dunlap
2018-09-25 10:44 ` Ian Jackson
2018-09-25 11:20 ` Anthony PERARD
2018-09-28 11:37 ` George Dunlap
2018-09-28 12:59 ` Anthony PERARD [this message]
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