[Dle-develop] [PATCH -tip tracing/kprobes 6/6] kprobes: Prohibit to probe native_get_debugreg

[Masami H. <mhi...@re...>]

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

Signed-off-by: Masami Hiramatsu <mhi...@re...>
Cc: Frederic Weisbecker <fwe...@gm...>
Cc: Ananth N Mavinakayanahalli <an...@in...>
Cc: Ingo Molnar <mi...@el...>
---

 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 */
 };
 


-- 
Masami Hiramatsu

Software Engineer
Hitachi Computer Products (America), Inc.
Software Solutions Division

e-mail: mhi...@re...