Re: preempt with selinux NULL pointer dereference

[Antoine Martin <antoine@nagafix.co.uk>]

> > [ 4788.218951] Unable to handle kernel NULL pointer dereference at 0000000000000028 RIP:
> > [ 4788.218959] <ffffffff80247381>{inode_has_perm+81}
> > [ 4788.218971] PGD 2485f067 PUD 0
> > [ 4788.218975] Oops: 0000 [1] PREEMPT
> > [ 4788.218977] CPU 0
> > [ 4788.218979] Modules linked in: parport_pc lp parport eeprom i2c_sensor i2c_viapro i2c_dev i2c_core rfcomm l2cap bluetooth sunrpc ipt_REJECT ipt_state ip_conntrack iptable_filter ip_tables dm_mod hotkey container tsdev usbhid yenta_socket rsrc_nonstatic uhci_hcd ehci_hcd shpchp via_ircc irda crc_ccitt
> > [ 4788.218995] Pid: 19002, comm: ssh Tainted: G   M  2.6.13-rc5
> 
> Which of your modules is non-GPL and can you please remove them and see if 
> there's still a problem?
Hmm. I occasionally use out-of-tree drivers (wlan cards mainly) so I
thought these could be the culprit, but all the above are in the source
tree (I keep the others out):
lsmod | awk '{print $1".ko"}' | sed 's+_+-+g' | xargs -n 1
find /lib/modules/2.6.13-rc5 -type f -name
/lib/modules/2.6.13-rc5/kernel/drivers/char/lp.ko
/lib/modules/2.6.13-rc5/kernel/drivers/parport/parport.ko
/lib/modules/2.6.13-rc5/kernel/drivers/i2c/chips/eeprom.ko
/lib/modules/2.6.13-rc5/kernel/drivers/i2c/i2c-sensor.ko
/lib/modules/2.6.13-rc5/kernel/drivers/i2c/busses/i2c-viapro.ko
/lib/modules/2.6.13-rc5/kernel/drivers/i2c/i2c-dev.ko
/lib/modules/2.6.13-rc5/kernel/drivers/i2c/i2c-core.ko
/lib/modules/2.6.13-rc5/kernel/net/bluetooth/rfcomm/rfcomm.ko
/lib/modules/2.6.13-rc5/kernel/net/bluetooth/l2cap.ko
/lib/modules/2.6.13-rc5/kernel/net/bluetooth/bluetooth.ko
/lib/modules/2.6.13-rc5/kernel/net/sunrpc/sunrpc.ko
/lib/modules/2.6.13-rc5/kernel/drivers/md/dm-mod.ko
/lib/modules/2.6.13-rc5/kernel/drivers/acpi/hotkey.ko
/lib/modules/2.6.13-rc5/kernel/drivers/acpi/container.ko
/lib/modules/2.6.13-rc5/kernel/drivers/input/tsdev.ko
/lib/modules/2.6.13-rc5/kernel/drivers/usb/input/usbhid.ko
/lib/modules/2.6.13-rc5/kernel/drivers/usb/host/uhci-hcd.ko
/lib/modules/2.6.13-rc5/kernel/drivers/usb/host/ehci-hcd.ko
/lib/modules/2.6.13-rc5/kernel/drivers/pci/hotplug/shpchp.ko
/lib/modules/2.6.13-rc5/kernel/drivers/net/irda/via-ircc.ko
/lib/modules/2.6.13-rc5/kernel/net/irda/irda.ko
/lib/modules/2.6.13-rc5/kernel/lib/crc-ccitt.ko
(iptables ones omitted)

Is there an *easy* way to figure out what is tainting my kernel?
I removed all I could (whilst leaving the machine usable):
# lsmod
Module                  Size  Used by
tsdev                   8832  0
usbhid                 48992  0
uhci_hcd               36000  0
parport_pc             44080  0
parport                42444  1 parport_pc
i2c_sensor              3840  0
i2c_core               25048  1 i2c_sensor
l2cap                  29704  2
bluetooth              56516  3 l2cap
sunrpc                163688  1
ipt_REJECT              6464  1
ipt_state               2368  3
ip_conntrack           49812  1 ipt_state
iptable_filter          3584  1
ip_tables              24000  3 ipt_REJECT,ipt_state,iptable_filter
yenta_socket           25804  4
rsrc_nonstatic         13376  1 yenta_socket
irda                  210924  0
crc_ccitt               2560  1 irda

# cat /proc/sys/kernel/tainted
16
Even figuring out the definition of the 'tainted' masks took a bit of
googling.

Thanks
Antoine

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