From: Masami Hiramatsu <mhiramat@redhat.com>
Date: Thu, 27 Aug 2009 17:23:32 +0000 (-0400)
Subject: kprobes: Prohibit to probe native_get_debugreg
X-Git-Url: https://git.stricted.de/?a=commitdiff_plain;h=65e234ec2c4a0659ca22531dc1372a185f088517;p=GitHub%2Fmoto-9609%2Fandroid_kernel_motorola_exynos9610.git

kprobes: Prohibit to probe native_get_debugreg

Since do_debug() calls get_debugreg(), native_get_debugreg() will be
called from singlestepping. This can cause an int3 infinite loop.

We can't put it in the .text.kprobes section because it is inlined,
then we blacklist its name.

Signed-off-by: Masami Hiramatsu <mhiramat@redhat.com>
Acked-by: Ananth N Mavinakayanahalli <ananth@in.ibm.com>
Cc: Ingo Molnar <mingo@elte.hu>
LKML-Reference: <20090827172332.8246.34194.stgit@localhost.localdomain>
Signed-off-by: Frederic Weisbecker <fweisbec@gmail.com>
---

diff --git a/kernel/kprobes.c b/kernel/kprobes.c
index f72e96c25a38..3267d90bc9d6 100644
--- a/kernel/kprobes.c
+++ b/kernel/kprobes.c
@@ -90,6 +90,7 @@ static spinlock_t *kretprobe_table_lock_ptr(unsigned long hash)
  */
 static struct kprobe_blackpoint kprobe_blacklist[] = {
 	{"preempt_schedule",},
+	{"native_get_debugreg",},
 	{NULL}    /* Terminator */
 };