作者gn00618777 (非常念舊)
看板LinuxDev
標題[問題] kernel module
時間Mon Oct 15 23:28:25 2018
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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1F：→ final01: static int __init xxxxx(void) 這樣試試?? 10/15 23:56
2F：推 yvb: 應該是 printk 沒加換行, 看到前一次的訊息吧. 10/16 20:17
3F：→ gn00618777: 都不行.... 10/16 21:08
※ 編輯: gn00618777 (219.68.215.61), 10/16/2018 21:11:24
4F：→ gn00618777: 我想..應該就是verification的問題了 10/16 22:54
5F：→ gn00618777: 得重編kernel 10/16 22:55
6F：推 yvb: 剛弄了一台 4.15.0-36-generic (Ubuntu 16.04.5 LTS) 實測, 10/17 00:51
7F：→ yvb: 證實是 printk 加上換行就好了. 與 verification 無關. 10/17 00:52
8F：→ yvb: "eeeentry" => "eeeentry\n" 及 "Good bye" => "Good bye\n" 10/17 00:54
9F：→ gn00618777: ....我剛剛正準備重編了XD 還好有再上來看這篇 謝 10/17 23:18