From: bibo,mao <bibo.mao@intel.com>
Date: Mon, 2 Oct 2006 09:17:34 +0000 (-0700)
Subject: [PATCH] disallow kprobes on notifier_call_chain
X-Git-Tag: v2.6.19-rc1~455
X-Git-Url: http://pilppa.com/gitweb/?a=commitdiff_plain;h=f2aa85a0ccd90110e76c6375535adc3ae358f971;p=linux-2.6-omap-h63xx.git

[PATCH] disallow kprobes on notifier_call_chain

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>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
---

diff --git a/kernel/sys.c b/kernel/sys.c
index 2460581c928..398d57923f9 100644
--- a/kernel/sys.c
+++ b/kernel/sys.c
@@ -221,7 +221,7 @@ EXPORT_SYMBOL_GPL(atomic_notifier_chain_unregister);
  *	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;