Module linux内核中断劫持

因此，我的最后一个内核作业是通过将IDT中的中断处理程序的地址替换为我自己的劫持例程的地址来劫持中断。我的模块工作正常；然而，每当我在我的劫持例程中有一个print语句时，我就会得到一个内核oops或panic。所以我想我想知道是否有人对此有解释，或者是否有办法调试它。我正在运行内核3.0.4，下面是我收到的一些错误消息

[ 2479.355359] general protection fault: 0000 [#2] SMP 
[ 2479.356972] Modules linked in: get_idt(P) cryptd aes_i586 aes_generic binfmt_misc pci_stub vboxpci vboxnetadp vboxnetflt vboxdrv nouveau ttm drm_kms_helper drm i2c_algo_bit mxm_wmi parport_pc ppdev snd_hda_codec_analog joydev pcmcia snd_hda_intel snd_hda_codec snd_hwdep snd_pcm arc4 snd_seq_midi yenta_socket pcmcia_rsrc pcmcia_core snd_rawmidi r852 sm_common nand nand_ids nand_ecc video ath5k ath snd_seq_midi_event mac80211 snd_seq snd_timer cfg80211 btusb snd_seq_device bluetooth psmouse thinkpad_acpi tpm_tis serio_raw sdhci_pci firewire_ohci sdhci mtd firewire_core crc_itu_t tpm tpm_bios nvram snd e1000e lp parport soundcore snd_page_alloc [last unloaded: get_idt]
[ 2479.358225] 
[ 2479.358225] Pid: 2872, comm: float Tainted: P      D     3.0.0 #46 LENOVO 64574JU/64574JU
[ 2479.358225] EIP: 0060:[<c1049244>] EFLAGS: 00210046 CPU: 0
[ 2479.358225] EIP is at vprintk+0x64/0x4a0
[ 2479.358225] EAX: ffffffff EBX: 00000000 ECX: 00000000 EDX: 00000000
[ 2479.358225] ESI: f0143fd8 EDI: 00000000 EBP: f0143fbc ESP: f0143f44
[ 2479.358225]  DS: 007b ES: 007b FS: 0000 GS: 00e0 SS: 0068
[ 2479.358225] Process float (pid: 2872, ti=f0142000 task=f08df230 task.ti=f0142000)
[ 2479.358225] Stack:
[ 2479.358225]  f08df230 f0398ab8 f0398a80 00000004 00200046 b7651c10 c10ff884 f84bd024
[ 2479.358225]  f0398a80 f0143f98 c1100889 ffffffef 00000004 ef85e7f4 f0398a84 ef85e9a0
[ 2479.358225]  b7799000 ef85e7e8 f0398a80 f0398ab8 b7788000 f0143fac c1101c9b b7783ff4
[ 2479.358225] Call Trace:
[ 2479.358225]  [<c10ff884>] ? remove_vma+0x44/0x60
[ 2479.358225]  [<c1100889>] ? do_munmap+0x1f9/0x270
[ 2479.358225]  [<c1101c9b>] ? sys_munmap+0x4b/0x60
[ 2479.358225]  [<c1516760>] ? spurious_fault+0xd0/0xd0
[ 2479.358225]  [<c1510af6>] printk+0x30/0x32
[ 2479.358225]  [<f84bc028>] take_over+0x28/0x30 [get_idt]
[ 2479.358225]  [<f84bc03e>] hijack+0x6/0x18 [get_idt]
[ 2479.358225] Code: 78 c1 00 0f 84 29 03 00 00 8b 1d ac 94 78 c1 85 db 0f 85 a6 03 00 00 9c 58 8d 74 26 00 89 45 98 fa 90 8d 74 26 00 a1 f4 6d 73 c1 
[ 2479.358225]  8b 15 c0 30 83 c1 89 55 9c 39 c2 0f 84 9f 03 00 00 b8 a0 d6 
[ 2479.358225] EIP: [<c1049244>] vprintk+0x64/0x4a0 SS:ESP 0068:f0143f44
[ 2479.358225] ---[ end trace bae1cb37e149735b ]---

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我制作了一个不同的例程来处理一个正常工作的整数，但我希望该例程包含一个print语句。

调用

printk

时应以

KERN.*

常量作为前缀。因此，请尝试：

 printk(KERN_INFO "Divide by 0 has been hijacked\n");

---

是的，这是正确的：

KERN\u INFO

和字符串之间没有逗号。

是否这些特定的按键需要特定的处理，并且通过返回

IRQ\u HANDLED

内核不会调用其他共享处理程序？您是否尝试返回

IRQ\u NONE

 printk(KERN_INFO "Divide by 0 has been hijacked\n");