Messages in this thread | | | Date | 18 Jan 2005 09:52:18 +0100 | Date | Tue, 18 Jan 2005 09:52:17 +0100 | From | Andi Kleen <> | Subject | Re: x86-64: int3 no longer causes SIGTRAP in 2.6.10 |
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> Yes its a bug, we turn trap 3 into interrupt gates to ensure that it is not preemtable.
Is the patch ok for you?
-Andi
> > Like this patch. > > > > Index: linux/arch/x86_64/kernel/traps.c > > =================================================================== > > --- linux.orig/arch/x86_64/kernel/traps.c 2005-01-17 10:34:24.%N +0100 > > +++ linux/arch/x86_64/kernel/traps.c 2005-01-18 02:42:02.%N +0100 > > @@ -908,7 +908,7 @@ > > set_intr_gate(0,÷_error); > > set_intr_gate_ist(1,&debug,DEBUG_STACK); > > set_intr_gate_ist(2,&nmi,NMI_STACK); > > - 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 > > =================================================================== > > --- 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; > > if (kprobe_handler(args->regs)) > > return NOTIFY_STOP; > > break; > > > > - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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