Hi David,
Thanks for your help. I can intercept the time function now.
But the kernel crashed when I tried to de-install the module. I
declared the old_time as:
static unsigned long old_time;
and in init_module:
old_time = sys_call_table[__NR_gettimeofday - 1024];
....
and then in cleanup_module:
sys_call_table[__NR_gettimeofday - 1024] = old_time.
Why can't it work?
And I tried to declare the old_time as a function pointer and restore
the syscall entry like:
sys_call_table[__NR_gettimeofday - 1024] = ((struct fptr *)&old_time)->ip;
it can't work too.
Regards,
JinShan
On Thu, 27 Jan 2005 18:10:36 -0800, David Mosberger
<[EMAIL PROTECTED]> wrote:
> >>>>> On Fri, 28 Jan 2005 10:04:33 +0800, JinShan Xiong <[EMAIL PROTECTED]>
> >>>>> said:
>
> JinShan> Hi David, I don't know how to use the stub code, I have
> JinShan> tried to copy it to overload sys_gettimeofday(), like this,
>
> JinShan> memcpy(sys_call_table[__NR_gettimeofday - 1024],
> JinShan> new_time_stub, 32),
>
> JinShan> it crashed the kenrel also.
>
> JinShan> Please help me!
>
> sys_call_table[__NR_gettimeofday - 1024] would have to be set to the
> entry-point of new_time_stub. If you declare new_time_stub as a
> function, you'd have to do this like so:
>
> extern void new_time_stub (whatever...);
> struct fptr { void *ip, void *gp };
>
> sys_call_table[__NR_gettimeofday - 1024] =
> ((struct fptr *) &new_time_stub)->ip;
>
> --david
>
>
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