linux-kernel - [PATCH -tip v7 06/26] [BUGFIX] x86: Prohibit probing on native_set_debugreg/load

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Message-ID: <20140227073330.20992.38095.stgit@ltc230.yrl.intra.hitachi.co.jp>
Date:	Thu, 27 Feb 2014 16:33:30 +0900
From:	Masami Hiramatsu <masami.hiramatsu.pt@...achi.com>
To:	linux-kernel@...r.kernel.org, Ingo Molnar <mingo@...nel.org>
Cc:	Jeremy Fitzhardinge <jeremy@...p.org>, x86@...nel.org,
	Ananth N Mavinakayanahalli <ananth@...ibm.com>,
	Sandeepa Prabhu <sandeepa.prabhu@...aro.org>,
	Frederic Weisbecker <fweisbec@...il.com>,
	Rusty Russell <rusty@...tcorp.com.au>,
	Steven Rostedt <rostedt@...dmis.org>,
	Chris Wright <chrisw@...s-sol.org>, fche@...hat.com,
	mingo@...hat.com, systemtap@...rceware.org,
	"H. Peter Anvin" <hpa@...or.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	Alok Kataria <akataria@...are.com>
Subject: [PATCH -tip v7 06/26] [BUGFIX] x86: Prohibit probing on
 native_set_debugreg/load_idt

Prohibit probing on native_set_debugreg and native_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 <masami.hiramatsu.pt@...achi.com>
Cc: Jeremy Fitzhardinge <jeremy@...p.org>
Cc: Chris Wright <chrisw@...s-sol.org>
Cc: Alok Kataria <akataria@...are.com>
Cc: Rusty Russell <rusty@...tcorp.com.au>
Cc: Thomas Gleixner <tglx@...utronix.de>
Cc: Ingo Molnar <mingo@...hat.com>
Cc: "H. Peter Anvin" <hpa@...or.com>
---
 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 4c785fd..abff75f 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 real function entry */
+/* At this point, native_get/set_debugreg has real function entry */
 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


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