hello.c
#include <linux/kernel.h> /*Needed by all modules*/
#include <linux/module.h> /*Needed for KERN_* */
#include <linux/init.h> /* Needed for the macros */
#include <asm/current.h>
#include <linux/sched.h>
MODULE_LICENSE("GPL");
static int hello_init(void)
{
printk(KERN_WARNING "the process is\"%d\"(pid %i)\n",current->comm, current->pid);
return 0;
}
static void hello_exit(void)
{
printk("Bye, kernel!\n");
}
/* main module function*/
module_init(hello_init);
module_exit(hello_exit);
root@ubuntu:~/Desktop# insmod ./hello.ko
root@ubuntu:~/Desktop# tail /var/log/kern.log
Aug 26 07:05:06 ubuntu kernel: [ 38.280651] audit: type=1400 audit(1535292306.730:64): apparmor="STATUS" operation="profile_replace" profile="unconfined" name="/usr/sbin/cupsd" pid=2130 comm="apparmor_parser"
Aug 26 07:19:41 ubuntu kernel: [ 913.186836] e1000: eth0 NIC Link is Down
Aug 26 07:19:45 ubuntu kernel: [ 917.188835] e1000: eth0 NIC Link is Up 1000 Mbps Full Duplex, Flow Control: None
Aug 26 07:22:25 ubuntu kernel: [ 1076.499433] e1000: eth0 NIC Link is Down
Aug 26 07:22:29 ubuntu kernel: [ 1080.499470] e1000: eth0 NIC Link is Up 1000 Mbps Full Duplex, Flow Control: None
Aug 26 07:31:10 ubuntu kernel: [ 1602.402400] hello: module verification failed: signature and/or required key missing - tainting kernel
Aug 26 07:31:10 ubuntu kernel: [ 1602.408784] Hello kernel, it's 2018!
Aug 26 07:31:10 ubuntu kernel: [ 1602.408792] the process is"1383225440"(pid 3571)
Aug 26 07:32:39 ubuntu kernel: [ 1691.260987] Bye, kernel!
Aug 26 07:33:50 ubuntu kernel: [ 1762.382921] the process is"1656784352"(pid 3890)
root@ubuntu:~/Desktop#
lsmod
root@ubuntu:~/Desktop# lsmod
Module Size Used by
hello 16384 0
coretemp 16384 0
crct10dif_pclmul 16384 0
crc32_pclmul 16384 0
aesni_intel 167936 0
snd_ens1371 28672 0
snd_ac97_codec 131072 1 snd_ens1371
aes_x86_64 20480 1 aesni_intel
gameport 16384 1 snd_ens1371
ac97_bus 16384 1 snd_ac97_codec
vmw_balloon 16384 0
lrw 16384 1 aesni_intel
gf128mul 16384 1 lrw
glue_helper 16384 1 aesni_intel
ablk_helper 16384 1 aesni_intel
snd_pcm 102400 2 snd_ac97_codec,snd_ens1371
cryptd 20480 2 aesni_intel,ablk_helper
snd_seq_midi 16384 0
snd_seq_midi_event 16384 1 snd_seq_midi
input_leds 16384 0
joydev 20480 0
serio_raw 16384 0
snd_rawmidi 32768 2 snd_ens1371,snd_seq_midi
snd_seq 69632 2 snd_seq_midi_event,snd_seq_midi
vmwgfx 172032 3
snd_seq_device 16384 3 snd_seq,snd_rawmidi,snd_seq_midi
ttm 94208 1 vmwgfx
snd_timer 32768 2 snd_pcm,snd_seq
btusb 45056 0
drm_kms_helper 126976 1 vmwgfx
snd 81920 7 snd_ac97_codec,snd_timer,snd_pcm,snd_seq,snd_rawmidi,snd_ens1371,snd_seq_device
btrtl 16384 1 btusb
btbcm 16384 1 btusb
btintel 16384 1 btusb
drm 360448 6 ttm,drm_kms_helper,vmwgfx
soundcore 16384 1 snd
vmw_vmci 65536 0
i2c_piix4 24576 0
shpchp 36864 0
nfit 32768 0
rfcomm 69632 8
bnep 20480 2
8250_fintek 16384 0
bluetooth 512000 25 bnep,btbcm,btrtl,btusb,rfcomm,btintel
binfmt_misc 20480 1
mac_hid 16384 0
parport_pc 32768 0
ppdev 20480 0
lp 20480 0
parport 49152 3 lp,ppdev,parport_pc
hid_generic 16384 0
usbhid 49152 0
hid 118784 2 hid_generic,usbhid
psmouse 126976 0
mptspi 24576 2
mptscsih 40960 1 mptspi
mptbase 98304 2 mptspi,mptscsih
ahci 36864 0
libahci 32768 1 ahci
e1000 131072 0
scsi_transport_spi 32768 1 mptspi
pata_acpi 16384 0
root@ubuntu:~/Desktop#
