linux-kernel - [PATCH 2/3] disallow kprobes on notifier_call

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Date:	Tue, 26 Sep 2006 13:02:29 +0800
From:	"bibo,mao" <bibo.mao@...el.com>
To:	Andrew Morton <akpm@...l.org>
CC:	linux-kernel@...r.kernel.org,
	Ananth N Mavinakayanahalli <ananth@...ibm.com>,
	Masami Hiramatsu <masami.hiramatsu.pt@...achi.com>,
	"Keshavamurthy, Anil S" <anil.s.keshavamurthy@...el.com>
Subject: [PATCH 2/3] disallow kprobes on notifier_call_chain

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@...el.com>
Signed-off-by: Ananth N Mavinakayanahalli <ananth@...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;
-
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