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

Masami Hiramatsu
2009-08-27T17:22:42Z

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 <mhiramat@redhat.com>
Cc: Frederic Weisbecker <fweisbec@gmail.com>
Cc: Ananth N Mavinakayanahalli <ananth@in.ibm.com>
Cc: Ingo Molnar <mingo@elte.hu>
---

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: mhiramat@redhat.com