From 8027197220e02d5cebbbfdff36c2827661fbc692 Mon Sep 17 00:00:00 2001 From: Masami Hiramatsu Date: Thu, 17 Apr 2014 17:17:19 +0900 Subject: [PATCH] kprobes, x86: Prohibit probing on native_set_debugreg()/load_idt() Since the kprobes uses do_debug for single stepping, functions called from do_debug() before notify_die() must not be probed. And also native_load_idt() is called from paranoid_exit when returning int3, this also must not be probed. Signed-off-by: Masami Hiramatsu Reviewed-by: Steven Rostedt Cc: Alok Kataria Cc: Chris Wright Cc: Jeremy Fitzhardinge Cc: Rusty Russell Cc: virtualization@lists.linux-foundation.org Link: http://lkml.kernel.org/r/20140417081719.26341.65542.stgit@ltc230.yrl.intra.hitachi.co.jp Signed-off-by: Ingo Molnar --- arch/x86/kernel/paravirt.c | 4 +++- 1 file changed, 3 insertions(+), 1 deletion(-) diff --git a/arch/x86/kernel/paravirt.c b/arch/x86/kernel/paravirt.c index e136869ae42e..548d25f00c90 100644 --- a/arch/x86/kernel/paravirt.c +++ b/arch/x86/kernel/paravirt.c @@ -390,8 +390,10 @@ __visible struct pv_cpu_ops pv_cpu_ops = { .end_context_switch = paravirt_nop, }; -/* At this point, native_get_debugreg has a real function entry */ +/* At this point, native_get/set_debugreg has real function entries */ NOKPROBE_SYMBOL(native_get_debugreg); +NOKPROBE_SYMBOL(native_set_debugreg); +NOKPROBE_SYMBOL(native_load_idt); struct pv_apic_ops pv_apic_ops = { #ifdef CONFIG_X86_LOCAL_APIC -- 2.30.2