[PATCH 2/3] disallow kprobes on notifier_call_chain

["bibo,mao" <bibo.mao@intel.com>]

Hi,

When kprobe is re-entered, the re-entered kprobe kernel path will will call atomic_notifier_call_chain function, if this function is kprobed that will incur numerous kprobe recursive fault. This patch disallows kprobes on atomic_notifier_call_chain function.

Signed-off-by: bibo, mao <bibo.mao@intel.com>
Signed-off-by: Ananth N Mavinakayanahalli <ananth@in.ibm.com>

thanks
bibo,mao

diff -Nruap 2.6.18-mm1.org/kernel/sys.c 2.6.18-mm1/kernel/sys.c
--- 2.6.18-mm1.org/kernel/sys.c	2006-09-26 10:16:33.000000000 +0800
+++ 2.6.18-mm1/kernel/sys.c	2006-09-26 10:49:37.000000000 +0800
@@ -222,7 +222,7 @@ EXPORT_SYMBOL_GPL(atomic_notifier_chain_
  *	of the last notifier function called.
  */
  
-int atomic_notifier_call_chain(struct atomic_notifier_head *nh,
+int __kprobes atomic_notifier_call_chain(struct atomic_notifier_head *nh,
 		unsigned long val, void *v)
 {
 	int ret;