ハック de 録!!（５）モジュールのロード

HS-DHGL
カーネルモジュールが標準ファームの insmod なら組み込めるかを確認する。

標準ファームの HDD をマウント

標準ファームの HDD を debian にマウントする。 
hackkit:~# mkdir /tmp/root
hackkit:~# mount /dev/sdb2  /tmp/root
hackkit:~# cd /tmp/root
hackkit:/tmp/root# ls
bin  boot  dev  etc  home  lib  mnt  proc  root  sbin  share  tmp  usr  var  www
hackkit:/tmp/root#

標準ファームへ chroot

hackkit:/tmp/root# chroot .
hackkit:/#

標準ファーム環境でカーネルモジュールのロード

hackkit:/# insmod /lib/modules/mv7dxu2_d.ko
hackkit:/# lsmod
Opening /proc/modules: No such file or directory
hackkit:/# mount /proc
hackkit:/# lsmod
Module                  Size  Used by
mv7dxu2_d               2984  0
hackkit:/#
組み込めた。
後始末 
hackkit:/# rmmod mv7dxu2_d
hackkit:/# lsmod
Module                  Size  Used by
hackkit:/# umount /proc
hackkit:/# exit
exit
hackkit:/tmp/root#

jail へコピー

hackkit:/tmp/root# tar cf - lib/modules/*.ko |(cd /usr/local/buffalo/; tar xvf -)
lib/modules/averusb.ko
lib/modules/mv7dxu2_0.ko
lib/modules/mv7dxu2_1.ko
lib/modules/mv7dxu2_2.ko
lib/modules/mv7dxu2_3.ko
lib/modules/mv7dxu2_d.ko
lib/modules/v4l1-compat.ko
lib/modules/v4l2-common.ko
lib/modules/videodev.ko
hackkit:/tmp/root# tar cf - sbin/insmod |(cd /usr/local/buffalo/; tar xvf -)
sbin/insmod
hackkit:/tmp/root#

jail で実行

hackkit:/tmp/root# chroot /usr/local/buffalo /sbin/insmod /lib/modules/mv7dxu2_d.ko
hackkit:/tmp/root#
というわけで、jail の中なら実行可能。

rmmod, lsmod もコピーしておく 

hackkit:/tmp/root# tar cf - sbin/rmmod |(cd /usr/local/buffalo/; tar xvf -)
sbin/rmmod
hackkit:/tmp/root# tar cf - sbin/lsmod |(cd /usr/local/buffalo/; tar xvf -)
sbin/lsmod
hackkit:/tmp/root# chroot /usr/local/buffalo /sbin/rmmod mv7dxu2_d

スクリプトによるロード

標準ファームは etc/init.d/module_loader.sh でロードしているので、 それもコピーする。 
hackkit:/tmp/root# tar cf - etc/init.d/module_loader.sh |(cd /usr/local/buffalo/; tar xvf -)
etc/init.d/module_loader.sh
hackkit:/tmp/root#
実行 
hackkit:/tmp/root# chroot /usr/local/buffalo /etc/init.d/module_loader.sh start
chroot: cannot run command `/etc/init.d/module_loader.sh': No such file or directory
hackkit:/tmp/root#
/bin/sh がない、、、
sh もコピーする 
hackkit:/tmp/root# chroot /usr/local/buffalo
chroot: cannot run command `/bin/bash': No such file or directory
hackkit:/tmp/root# ls -l bin/*sh
lrwxrwxrwx  1 root root      7 Dec 23 15:51 bin/ash -> busybox
-rwxr-xr-x  1 root root 619848 Dec  8 16:05 bin/bash
lrwxrwxrwx  1 root root      7 Dec 23 15:51 bin/fdflush -> busybox
lrwxrwxrwx  1 root root      4 Dec 23 15:51 bin/sh -> bash
hackkit:/tmp/root#
試しに chroot 
hackkit:/tmp/root# chroot /usr/local/buffalo/
/bin/bash: error while loading shared libraries: libdl.so.2: cannot open shared object file: No such file or directory
hackkit:/tmp/root#
今度はライブラリが足りない。 
hackkit:/tmp/root# ls -l lib/libdl*
-rwxr-xr-x  1 root root 10480 Dec  8 16:06 lib/libdl-2.3.6.so
lrwxrwxrwx  1 root root    14 Dec 23 15:51 lib/libdl.so.2 -> libdl-2.3.6.so
hackkit:/tmp/root# tar cf - lib/libdl* |(cd /usr/local/buffalo/; tar xvf -)
lib/libdl-2.3.6.so
lib/libdl.so.2
hackkit:/tmp/root# chroot /usr/local/buffalo
/bin/bash: error while loading shared libraries: libgcc_s.so.1: cannot open shared object file: No such file or directory
hackkit:/tmp/root# ls -l lib/libgcc_s.so*
lrwxrwxrwx  1 root root    13 Dec 23 15:51 lib/libgcc_s.so -> libgcc_s.so.1
-rw-r--r--  1 root root 38036 Jan 31  2006 lib/libgcc_s.so.1
hackkit:/tmp/root# tar cf - lib/libgcc_s.so*|(cd /usr/local/buffalo/; tar xvf -)
lib/libgcc_s.so
lib/libgcc_s.so.1
hackkit:/tmp/root# chroot /usr/local/buffalo
hackkit:/# exit
exit
hackkit:/tmp/root#
揃ったかな。実行 
hackkit:/tmp/root# chroot /usr/local/buffalo /etc/init.d/module_loader.sh start
/etc/init.d/module_loader.sh: line 1: tr: command not found
/etc/init.d/module_loader.sh: line 1: grep: command not found
/etc/init.d/module_loader.sh: line 1: grep: command not found
Opening /proc/modules: No such file or directory
Opening /proc/modules: No such file or directory
	:
今度は、tr や grep がないし、/proc もマウントされてないし、、、

スクリプトの修正

最低限に修正する。 
hackkit:/tmp/root# vi /usr/local/buffalo/etc/init.d/module_loader.sh
	:
	:
hackkit:/tmp/root# diff -c etc/init.d/module_loader.sh /usr/local/buffalo/etc/init.d/module_loader.sh
hackkit:/tmp/root# diff -u etc/init.d/module_loader.sh /usr/local/buffalo/etc/init.d/module_loader.sh
--- etc/init.d/module_loader.sh 2006-10-12 16:16:54.000000000 +0900
+++ /usr/local/buffalo/etc/init.d/module_loader.sh      2007-02-19 16:00:46.000000000 +0900
@@ -3,47 +3,35 @@
 #load PC-MV7xDX/U2 devices
 load_mv7() {
        for m7mod in mv7dxu2_d mv7dxu2_0 mv7dxu2_1 mv7dxu2_2 mv7dxu2_3; do
-               isExist=`lsmod | grep $m7mod | grep -v grep`
-               if [ "$isExist" = "" ]; then
                        insmod "/lib/modules/$m7mod.ko"
-               fi
        done
 }

 #unload PC-MV7xDX/U2 devices
 unload_mv7() {
        for m7mod in mv7dxu2_3 mv7dxu2_2 mv7dxu2_1 mv7dxu2_0 mv7dxu2_d; do
-               isExist=`lsmod | grep $m7mod | grep -v grep`
-               if [ "$isExist" != "" ]; then
                        rmmod $m7mod
-               fi
        done
 }

 #load PC-MV5xDX/U2 devices
 load_mv5() {
        for m5mod in videodev v4l2-common v4l1-compat averusb; do
-               isExist=`lsmod | grep $m5mod | grep -v grep`
-               if [ "$isExist" = "" ]; then
                        insmod "/lib/modules/$m5mod.ko"
-               fi
        done
 }

 #unload PC-MV5xDX/U2 devices
 unload_mv5() {
        for m5mod in averusb v4l1_compat v4l2_common videodev; do
-               isExist=`lsmod | grep $m5mod | grep -v grep`
-               if [ "$isExist" != "" ]; then
                        rmmod $m5mod
-               fi
        done
 }

 if [ $# -eq 0 ]; then
        opt="start"
 else
-       opt=`echo $1 | tr '[A-Z]' '[a-z'`
+       opt=`echo $1`
 fi
 case "$opt" in
        "start")
@@ -60,13 +48,13 @@
                sleep 5
                load_mv7
                load_mv5
-       ;;
+               ;;
        *)
                unload_mv5
                unload_mv7
                sleep 5
                load_mv7
                load_mv5
-       ;;
+               ;;
 esac

hackkit:/tmp/root#

実行

hackkit:/tmp/root# chroot /usr/local/buffalo /etc/init.d/module_loader.sh start
insmod: error inserting '/lib/modules/mv7dxu2_d.ko': -1 File exists
insmod: error inserting '/lib/modules/mv7dxu2_0.ko': -1 File exists
insmod: error inserting '/lib/modules/mv7dxu2_1.ko': -1 File exists
insmod: error inserting '/lib/modules/mv7dxu2_2.ko': -1 File exists
insmod: error inserting '/lib/modules/mv7dxu2_3.ko': -1 File exists
insmod: error inserting '/lib/modules/videodev.ko': -1 File exists
insmod: error inserting '/lib/modules/v4l2-common.ko': -1 File exists
insmod: error inserting '/lib/modules/v4l1-compat.ko': -1 File exists
insmod: error inserting '/lib/modules/averusb.ko': -1 File exists
hackkit:/tmp/root#
おっと、さっき実行したときにロードされたのか？ 
hackkit:/tmp/root# chroot /usr/local/buffalo /etc/init.d/module_loader.sh stop
hackkit:/tmp/root# chroot /usr/local/buffalo /etc/init.d/module_loader.sh start
hackkit:/tmp/root#
OK。
確認。 
hackkit:/tmp/root# chroot /usr/local/buffalo lsmod
Opening /proc/modules: No such file or directory
hackkit:/tmp/root# chroot /usr/local/buffalo mount /proc
chroot: cannot run command `mount': No such file or directory
hackkit:/tmp/root#
あかんわ。

リアルな /proc

/proc はカーネルが管理しているのだから、 ヒョッとしてリアルな世界からも見えるのでは？ 
hackkit:/tmp/root# ls /proc/mv7dxu2
/proc/mv7dxu2
hackkit:/tmp/root#
あるあるぅ！ 
hackkit:/tmp/root# cat !$
cat /proc/mv7dxu2
device00=nodevice
device01=nodevice
device02=nodevice
device03=nodevice
hackkit:/tmp/root#

刺す

PC-MV7DX/U2 を刺してみる 
hackkit:/tmp/root# cat /var/log/messages
	:
	:
Feb 19 15:22:30 hackkit kernel: mv7dxu2_d: module license 'Proprietary' taints kernel.
Feb 19 15:22:30 hackkit kernel: LSUVCd 2.0.2 [Dec  7 2006]
Feb 19 15:22:30 hackkit kernel: LSUVC_init_proc - Returns
Feb 19 15:22:30 hackkit kernel: usbcore: registered new driver mv7dxu2_d
Feb 19 15:23:40 hackkit kernel: usbcore: deregistering driver mv7dxu2_d
Feb 19 15:28:04 hackkit kernel: LSUVCd 2.0.2 [Dec  7 2006]
Feb 19 15:28:04 hackkit kernel: LSUVC_init_proc - Returns
Feb 19 15:28:04 hackkit kernel: usbcore: registered new driver mv7dxu2_d
Feb 19 15:32:11 hackkit kernel: usbcore: deregistering driver mv7dxu2_d
Feb 19 15:36:00 hackkit kernel: LSUVCd 2.0.2 [Dec  7 2006]
Feb 19 15:36:00 hackkit kernel: LSUVC_init_proc - Returns
Feb 19 15:36:00 hackkit kernel: usbcore: registered new driver mv7dxu2_d
Feb 19 15:45:20 hackkit kernel: usbcore: registered new driver mv7dxu2_0
Feb 19 15:45:20 hackkit kernel: usbcore: registered new driver mv7dxu2_1
Feb 19 15:45:20 hackkit kernel: usbcore: registered new driver mv7dxu2_2
Feb 19 15:45:20 hackkit kernel: usbcore: registered new driver mv7dxu2_3
Feb 19 15:45:20 hackkit kernel: Linux video capture interface: v1.00
Feb 19 15:45:20 hackkit kernel: usbcore: registered new driver AVerMedia USB MPEG-2 Capture
Feb 19 15:45:20 hackkit kernel: AVerMedia USB MPEG-2 Capture version 0.19 loaded
Feb 19 16:02:52 hackkit kernel: usbcore: deregistering driver AVerMedia USB MPEG-2 Capture
Feb 19 16:02:52 hackkit kernel: usbcore: deregistering driver mv7dxu2_3
Feb 19 16:02:52 hackkit kernel: usbcore: deregistering driver mv7dxu2_2
Feb 19 16:02:52 hackkit kernel: usbcore: deregistering driver mv7dxu2_1
Feb 19 16:02:52 hackkit kernel: usbcore: deregistering driver mv7dxu2_0
Feb 19 16:02:52 hackkit kernel: usbcore: deregistering driver mv7dxu2_d
Feb 19 16:02:54 hackkit kernel: LSUVCd 2.0.2 [Dec  7 2006]
Feb 19 16:02:54 hackkit kernel: LSUVC_init_proc - Returns
Feb 19 16:02:54 hackkit kernel: usbcore: registered new driver mv7dxu2_d
Feb 19 16:02:54 hackkit kernel: usbcore: registered new driver mv7dxu2_0
Feb 19 16:02:54 hackkit kernel: usbcore: registered new driver mv7dxu2_1
Feb 19 16:02:54 hackkit kernel: usbcore: registered new driver mv7dxu2_2
Feb 19 16:02:54 hackkit kernel: usbcore: registered new driver mv7dxu2_3
Feb 19 16:02:54 hackkit kernel: Linux video capture interface: v1.00
Feb 19 16:02:54 hackkit kernel: usbcore: registered new driver AVerMedia USB MPEG-2 Capture
Feb 19 16:02:54 hackkit kernel: AVerMedia USB MPEG-2 Capture version 0.19 loaded
Feb 19 16:08:57 hackkit kernel: usb 1-1: new high speed USB device using ehci_platform and address 2
Feb 19 16:08:57 hackkit kernel: LSUVC_Probe_dev0 - Vendor ID: 0x411; Product ID: 0x73; Interface Number: 0x0
Feb 19 16:08:57 hackkit kernel: LSUVC_Probe_dev0 - Loader device.
Feb 19 16:08:57 hackkit kernel: LSUVC_LoadEzUsbFx2Firmware
Feb 19 16:08:57 hackkit kernel: LSUVC_LoadEzUsbFx2Firmware - Returns
Feb 19 16:08:57 hackkit kernel: LSUVC_Probe_dev0 - This IsDriverNo=0
Feb 19 16:08:57 hackkit kernel: -----------------------------------------------------
Feb 19 16:08:57 hackkit kernel: LSUVC_Probe_dev0 - Mount_process : 0 device num.
Feb 19 16:08:57 hackkit kernel: -----------------------------------------------------
Feb 19 16:08:57 hackkit kernel: LSUVC_Probe_dev0 - Device: 0xc7be64e0
Feb 19 16:08:57 hackkit kernel: usb 1-1: USB disconnect, address 2
Feb 19 16:08:57 hackkit kernel: LSUVC_Disconnect_dev0 - Device: 0xc7be64e0
Feb 19 16:08:57 hackkit kernel: LSUVC_Disconnect_dev0 - Device Index: 0x0
Feb 19 16:08:57 hackkit kernel: stDevInfo[0].nStatus=0
Feb 19 16:08:57 hackkit kernel: LSUVC_Disconnect_dev0 - Returns
Feb 19 16:08:59 hackkit kernel: usb 1-1: new high speed USB device using ehci_platform and address 3
Feb 19 16:08:59 hackkit kernel: LSUVC_Probe_dev0 - Vendor ID: 0x411; Product ID: 0x6f; Interface Number: 0x0
Feb 19 16:08:59 hackkit kernel: LSUVC_Probe_dev0 - This IsDriverNo=0
Feb 19 16:08:59 hackkit kernel: -----------------------------------------------------
Feb 19 16:08:59 hackkit kernel: LSUVC_Probe_dev0 - Mount_process : 0 device num.
Feb 19 16:08:59 hackkit kernel: -----------------------------------------------------
Feb 19 16:08:59 hackkit kernel: LSUVC_Probe_dev0 - Bulk in endponit: 0x2; Bulk out endpoint: 0x6.
Feb 19 16:08:59 hackkit kernel: LSUVC_AllocateResources
Feb 19 16:08:59 hackkit kernel: LSUVC_AllocateResources - Result: 0
Feb 19 16:08:59 hackkit kernel: LSUVC_Probe_dev0 - Device: 0xc7be64e0
Feb 19 16:08:59 hackkit kernel: LSUVC_Probe_dev0 - Vendor ID: 0x411; Product ID: 0x6f; Interface Number: 0x1
Feb 19 16:08:59 hackkit kernel: LSUVC_Probe_dev0 - Interface number is 0x1; Supported number is zero only.
Feb 19 16:08:59 hackkit kernel: LSUVC_Probe_dev1 - Vendor ID: 0x411; Product ID: 0x6f; Interface Number: 0x1
Feb 19 16:08:59 hackkit kernel: LSUVC_Probe_dev1 - Interface number is 0x1; Supported number is zero only.
Feb 19 16:08:59 hackkit kernel: LSUVC_Probe_dev2 - Vendor ID: 0x411; Product ID: 0x6f; Interface Number: 0x1
Feb 19 16:08:59 hackkit kernel: LSUVC_Probe_dev2 - Interface number is 0x1; Supported number is zero only.
Feb 19 16:08:59 hackkit kernel: LSUVC_Probe_dev3 - Vendor ID: 0x411; Product ID: 0x6f; Interface Number: 0x1
Feb 19 16:08:59 hackkit kernel: LSUVC_Probe_dev3 - Interface number is 0x1; Supported number is zero only.
認識してそう。 
hackkit:/tmp/root# cat /proc/mv7dxu2
device00=isdevice
device01=nodevice
device02=nodevice
device03=nodevice
hackkit:/tmp/root#
いずでばいす！

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