linux-kernel - Re: understanding firmware loader for speedtouch (kernel 2.6.21.5)

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

Date:	Mon, 9 Jul 2007 10:49:49 +0200
From:	mikie <mikie.pl@...il.com>
To:	"Indan Zupancic" <indan@....nu>
Cc:	"Duncan Sands" <duncan.sands@...h.u-psud.fr>,
	linux-kernel@...r.kernel.org
Subject: Re: understanding firmware loader for speedtouch (kernel 2.6.21.5)

2007/7/6, Indan Zupancic <indan@....nu>:
> On Fri, July 6, 2007 16:20, Duncan Sands wrote:
> > On Friday 6 July 2007 14:54:18 mikie wrote:
> >> Hi,
> >>
> >> I experience some problems with the speedtch.c module, especially in
> >> regards to its firmware loader.
> >> I am not quite sure if this module is going to load the firmware
> >> itself or does it use some external software to do that ?
> >
> > It loads it itself, using some external software!
>
> For information, it generates a hotplug event and the kernel calls the
> program written at /proc/sys/kernel/hotplug with certain information.
> That used to be /sbin/hotplug, became later udev, but today in general
> udev reads the uevents generated by the kernel.

On my system the /proc/sys/kernel/hotplug points to /sbin/hotplug.
I copied your script to /sbin/hotplug and also added simple logging,
so I can see whenever the script is being started. It turns out that
the script is not started at all by the kernel...

I am afraid that the kernel generates uevents only, could this be true?

The timeout value in /sys/class/firmware/timeout is 60 and it seems to
be working correctly (see logs with exactly 1 minute delay before next
find_firmware event)
As I check the debug log I can see some uevents :

Jul  9 09:03:19 srv kernel: speedtch 1-2:1.0: usbatm_usb_probe: using
3392 byte buffer for rx channel 0xc5577ca0
Jul  9 09:03:19 srv kernel: speedtch 1-2:1.0: usbatm_usb_probe: using
3392 byte buffer for tx channel 0xc5577ce8
Jul  9 09:03:19 srv kernel: speedtch 1-2:1.0: speedtch_find_firmware:
looking for speedtch-1.bin.2.00
Jul  9 09:03:19 srv kernel: DEV: registering device: ID = '1-2:1.0'
Jul  9 09:03:19 srv kernel: PM: Adding info for No Bus:1-2:1.0
Jul  9 09:03:19 srv kernel: dev_uevent: class uevent() returned -19
Jul  9 09:03:19 srv kernel: bound device '1-2:1.0' to driver 'speedtch'
Jul  9 09:03:19 srv kernel: usb: Bound Device 1-2:1.0 to Driver speedtch
Jul  9 09:04:07 srv kernel: drivers/usb/atm/speedtch.c: speedtch_usb_cleanup
Jul  9 09:04:07 srv kernel: bus usb: remove driver speedtch
Jul  9 09:04:07 srv kernel: speedtch 1-2:1.0: usbatm_usb_disconnect entered
Jul  9 09:04:19 srv kernel: DEV: Unregistering device. ID = '1-2:1.0'
Jul  9 09:04:19 srv kernel: PM: Removing info for No Bus:1-2:1.0
Jul  9 09:04:19 srv kernel: speedtch 1-2:1.0: speedtch_find_firmware:
looking for speedtch-1.bin.2
Jul  9 09:04:19 srv kernel: DEV: registering device: ID = '1-2:1.0'
Jul  9 09:04:19 srv kernel: PM: Adding info for No Bus:1-2:1.0
Jul  9 09:04:19 srv kernel: dev_uevent: class uevent() returned -19
Jul  9 09:05:19 srv kernel: DEV: Unregistering device. ID = '1-2:1.0'
Jul  9 09:05:19 srv kernel: PM: Removing info for No Bus:1-2:1.0
Jul  9 09:05:19 srv kernel: speedtch 1-2:1.0: speedtch_find_firmware:
looking for speedtch-1.bin
Jul  9 09:05:19 srv kernel: DEV: registering device: ID = '1-2:1.0'
Jul  9 09:05:19 srv kernel: PM: Adding info for No Bus:1-2:1.0
Jul  9 09:05:19 srv kernel: dev_uevent: class uevent() returned -19
Jul  9 09:06:19 srv kernel: DEV: Unregistering device. ID = '1-2:1.0'
Jul  9 09:06:19 srv kernel: PM: Removing info for No Bus:1-2:1.0
Jul  9 09:06:19 srv kernel: speedtch 1-2:1.0: speedtch_unbind entered
Jul  9 09:06:19 srv kernel: speedtch 1-2:1.1: usbatm_usb_disconnect entered
Jul  9 09:06:19 srv kernel: speedtch 1-2:1.1: usbatm_usb_disconnect:
NULL instance!

Mostly I think I should be worried about "dev_uevent: class uevent()
returned -19".
It sounds like the uevent failed? I do not have udevd, but still I
thought that in such case the kernel will use the script from
/proc/sys/kernel/hotplug but apparently it does not. Is there any
config option to choose between udev or hotplug in the kernel source ?

Regards,
MK
-
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/