[問題] kernel module

[gn00618777 (非常念舊)]

我在自己的電腦上編譯 kernel module

kernel 4.15.0-36-generic


程式碼僅有

static int driver_entry(void) {
   printk(KERN_INFO "eeeentry");
   return 0;
}


static void driver_exit(void) {
    printk(KERN_INFO "Good bye");
}

module_init(driver_entry);
module_exit(driver_exit);


MODULE_LICENSE("GPL");


但我不知道為何 insmod 和 rmmod 時，印出的順序是相反的XD，insmod 印出 Good bye

rmmod 印出eeeentry



[  131.604421] sayHello: loading out-of-tree module taints kernel.
[  131.604458] sayHello: module verification failed: signature and/or
required key missing - tainting kernel
[  131.606243] eeeentry
[  151.454288] Good bye
[  324.322405] eeeentry
[  372.027624] Good bye
[  430.550556] eeeentry

--------------------------------------------------------------------------

第一次 insmod 沒有出現任何我的 printk

[   21.142600] IPv6: ADDRCONF(NETDEV_UP): ens33: link is not ready
[   21.189327] IPv6: ADDRCONF(NETDEV_UP): ens33: link is not ready
[   21.192464] e1000: ens33 NIC Link is Up 1000 Mbps Full Duplex, Flow
Control: None
[   21.193253] IPv6: ADDRCONF(NETDEV_CHANGE): ens33: link becomes ready
[   77.120885] rfkill: input handler disabled
[  364.034842] sayHello: loading out-of-tree module taints kernel.
[  364.034883] sayHello: module verification failed: signature and/or
required key missing - tainting kernel

然後 rmmod 出現 driver_entry

   21.142600] IPv6: ADDRCONF(NETDEV_UP): ens33: link is not ready
[   21.189327] IPv6: ADDRCONF(NETDEV_UP): ens33: link is not ready
[   21.192464] e1000: ens33 NIC Link is Up 1000 Mbps Full Duplex, Flow
Control: None
[   21.193253] IPv6: ADDRCONF(NETDEV_CHANGE): ens33: link becomes ready
[   77.120885] rfkill: input handler disabled
[  364.034842] sayHello: loading out-of-tree module taints kernel.
[  364.034883] sayHello: module verification failed: signature and/or
required key missing - tainting kernel
[  364.039197] driver entry





請問有人遇過嗎?

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→ final01: static int __init xxxxx(void) 這樣試試??
推 yvb: 應該是 printk 沒加換行, 看到前一次的訊息吧.
→ gn00618777: 都不行....
※ 編輯: gn00618777 (219.68.215.61), 10/16/2018 21:11:24
→ gn00618777: 我想..應該就是verification的問題了
→ gn00618777: 得重編kernel
推 yvb: 剛弄了一台 4.15.0-36-generic (Ubuntu 16.04.5 LTS) 實測,
→ yvb: 證實是 printk 加上換行就好了. 與 verification 無關.
→ yvb: "eeeentry" => "eeeentry\n" 及 "Good bye" => "Good bye\n"
→ gn00618777: ....我剛剛正準備重編了XD  還好有再上來看這篇 謝