2012/10/29 Mulyadi Santosa <mulyadi.santosa@xxxxxxxxx>
Hi Fan...
you print CS and DS twice, once during init and once during exit of
On Sun, Oct 28, 2012 at 9:02 PM, Fan Yang <lljyangfan@xxxxxxxxx> wrote:
>
> [root@shell--box kernel_mod]# dmesg -c
> **********************************
> cs 60 96
> ds 7b 123
> ss 68 104
> es 7b 123
> fs d8 216
> gs e0 224
> **********************************
>
> The cs and ds in the kernel space is 60 and 7b. But the kernel define the
> KERNEL_CS as 60 and the KERNEL_DS as 7b. Where am I wrong?
>
your kernel module. So, which one do you want to confirm?
All in all, I have a guess that you see such number (DS belongs to
user space in kernel module) because IIRC kernel module loading is
done using syscall and with the help of modprobe helper.
Thus, it is important to access user space during that stage, hence DS
still using user space data segment.
--
regards,
Mulyadi Santosa
Freelance Linux trainer and consultant
blog: the-hydra.blogspot.com
training: mulyaditraining.blogspot.com
I get the same result during the kernel module init and exit. Then I try to add a syscall to print these registers, and nothing changed. It is strange.
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