[tip:perf/probes] kprobes: Prohibit to probe native_get_debugreg

[tip-bot for Masami Hiramatsu]

Commit-ID:  65e234ec2c4a0659ca22531dc1372a185f088517
Gitweb:     http://git.kernel.org/tip/65e234ec2c4a0659ca22531dc1372a185f088517
Author:     Masami Hiramatsu <mhiramat@xxxxxxxxxx>
AuthorDate: Thu, 27 Aug 2009 13:23:32 -0400
Committer:  Frederic Weisbecker <fweisbec@xxxxxxxxx>
CommitDate: Sun, 30 Aug 2009 03:15:55 +0200

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@xxxxxxxxxx>
Acked-by: Ananth N Mavinakayanahalli <ananth@xxxxxxxxxx>
Cc: Ingo Molnar <mingo@xxxxxxx>
LKML-Reference: <20090827172332.8246.34194.stgit@xxxxxxxxxxxxxxxxxxxxx>
Signed-off-by: Frederic Weisbecker <fweisbec@xxxxxxxxx>
---
 kernel/kprobes.c |    1 +
 1 files changed, 1 insertions(+), 0 deletions(-)

diff --git a/kernel/kprobes.c b/kernel/kprobes.c
index f72e96c..3267d90 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 */
 };
 
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