Re: Changing syscall table

[Zhenwen Xu <helight.xu@xxxxxxxxx>]

On Thu, Sep 03, 2009 at 08:27:42AM +0300, Jonathan Nell wrote:
> 2009/9/3 Zhenwen Xu <helight.xu@xxxxxxxxx>:
> > On Tue, Sep 01, 2009 at 08:57:58PM +0300, Jonathan Nell wrote:
> >> I'm trying to wrap the
> >> SG_IO ioctl call (i.e. trap it in the kernel) and have that dump the
> >> data from (struct sg_io_hdr).dxferp.
> >> Having issues with doing the kernel trap in the newer kernel versions
> >> though (trying on 2.6.30). The syscall table is now read-only but for
> >> some reason my set_memory_rw() call is failing... Any ideas how to do
> >> this properly?
> >>
> >> Here are the relevant bits of code:
> >
> > try read this:
> > http://zhwen.org/xlog/2009/03/%e6%88%aa%e8%8e%b7linux%e7%b3%bb%e7%bb%9f%e8%b0%83%e7%94%a8.htm
> >
> > here is the demo.
> > http://zhwen.org/coding/cat_syscall.c
> 
> Thanks for this. WIll try it today. How come you don't get a kernel
> paging error? Where are you making the syscall read/write?
I have tested this demo successfully for all syscall except fork.

this program is fail in fork! I haven't find the reason!

PS: forget to linux-c-programming@xxxxxxxxxxxxxxx
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