linux-kernel - Re: [systemd-devel] [PATCH] Change CONFIG_FW_LOADER_USER

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [day] [month] [year] [list]

Message-ID: <20130806163158.GA23093@kadzban.is-a-geek.net>
Date:	Tue, 6 Aug 2013 09:31:58 -0700
From:	Bryan Kadzban <bryan@...zban.is-a-geek.net>
To:	Tom Gundersen <teg@...m.no>
Cc:	Maarten Lankhorst <m.b.lankhorst@...il.com>,
	Andy Lutomirski <luto@...capital.net>,
	systemd-devel@...ts.freedesktop.org, linux-hotplug@...r.kernel.org,
	Linux Wireless List <linux-wireless@...r.kernel.org>,
	linux-kernel@...r.kernel.org,
	Intel Linux Wireless <ilw@...ux.intel.com>,
	Kay Sievers <kay@...y.org>,
	Johannes Berg <johannes@...solutions.net>
Subject: Re: [systemd-devel] [PATCH] Change CONFIG_FW_LOADER_USER_HELPER to default n and don't select it

On Tue, Aug 06, 2013 at 11:17:17AM +0200, Tom Gundersen wrote:
> On Tue, Aug 6, 2013 at 11:11 AM, Tom Gundersen <teg@...m.no> wrote:
> > On Tue, Aug 6, 2013 at 10:20 AM, Maarten Lankhorst
> > <m.b.lankhorst@...il.com> wrote:
> >> Op 05-08-13 18:29, Andy Lutomirski schreef:
> >>> The systemd commit below can delay firmware loading by multiple
> >>> minutes if CONFIG_FW_LOADER_USER_HELPER=y.  Unfortunately no one
> >>> noticed that the systemd-udev change would break new kernels as well
> >>> as old kernels.
> >>>
> >>> Since the kernel apparently can't count on reasonable userspace
> >>> support, turn this thing off by default.
> >>>
> >>> commit a3bd8447be4ea2ce230eb8ae0e815c04d85fa15a
> >>> Author: Tom Gundersen <teg@...m.no>
> >>> Date:   Mon Mar 18 15:12:18 2013 +0100
> >>>
> >>>     udev: make firmware loading optional and disable by default
> >>>
> >>>     Distros that whish to support old kernels should set
> >>>       --with-firmware-dirs="/usr/lib/firmware/updates:/usr/lib/firmware"
> >>>     to retain the old behaviour.
> >>>
> >> methinks this patch should be reverted then,
> >
> > Well, all the code is still there, so it can be enabled if anyone wants it.
> >
> >> or a stub should be added to udev to always fail firmware loading so timeouts don't occur.
> >
> > I think the only use (if any) of a userspace firmware loader would be
> > for anyone who wants a custom one (i.e., not udev), so we shouldn't
> > just fail the loading from udev unconditionally.
> >
> > How about we just improve the udev documentation a bit, similar to
> > Andy's kernel patch?
> 
> Sorry, I should first have checked. We already document this in the README:
> 
> >        Userspace firmware loading is deprecated, will go away, and
> >        sometimes causes problems:
> >          CONFIG_FW_LOADER_USER_HELPER=n

...And this patch is making the kernel default to the correct behavior,
instead of the now-broken-by-udev behavior.

I'm not sure I see the issue with it?  :-)

(Add me to the list of people that think udev is broken too, fwiw.  But
let's at least not leave *both* sides in a broken-by-default state.)

--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/