Hi Andi,
> > > - set_intr_gate(3,&int3);
> > > + set_system_gate(3,&int3);
> > > set_system_gate(4,&overflow); /* int4-5 can be called from all */
> > > set_system_gate(5,&bounds);
> > > set_intr_gate(6,&invalid_op);
> > > Index: linux/arch/x86_64/kernel/kprobes.c
This looks good to me. Andi do you see any thing that will cause premption
by moving int3 to system gate.
> > > ===================================================================
> > > --- linux.orig/arch/x86_64/kernel/kprobes.c 2005-01-04 12:12:39.%N
> > > +0100
> > > +++ linux/arch/x86_64/kernel/kprobes.c 2005-01-18 02:46:05.%N +0100
> > > @@ -297,6 +297,8 @@
> > > struct die_args *args = (struct die_args *)data;
> > > switch (val) {
> > > case DIE_INT3:
> > > + if (args->regs->cs & 3)
> > > + return NOTIFY_DONE;
This will prevent handling of userspace probes (privilege level 3). The
kprobe_exception handler will return from here and registered user space probe
handler won't be called.
Thanks
Prasanna
--
Prasanna S Panchamukhi
Linux Technology Center
India Software Labs, IBM Bangalore
Ph: 91-80-25044636
<[EMAIL PROTECTED]>
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