linux-kernel - [RFC] [PATCH] Refuse kprobe insertion on add/sub_preempt

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Message-Id: <200802201545.17986.srinivasa@in.ibm.com>
Date:	Wed, 20 Feb 2008 15:45:17 +0530
From:	Srinivasa Ds <srinivasa@...ibm.com>
To:	Andrew Morton <akpm@...ux-foundation.org>, ananth@...ibm.com,
	Jim Keniston <jkenisto@...ibm.com>,
	linux-kernel@...r.kernel.org, srikar@...ux.vnet.ibm.com
Subject: [RFC] [PATCH] Refuse kprobe insertion on add/sub_preempt_counter()

Kprobes makes use of preempt_disable(),preempt_enable_noresched() and these
functions inturn call add/sub_preempt_count(). So we need to refuse user from 
inserting probe in to these functions. 

This patch disallows user from probing add/sub_preempt_count(). 

Signed-off-by: Srinivasa DS <srinivasa@...ibm.com>


---
 kernel/sched.c |    4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

Index: linux-2.6.25-rc2/kernel/sched.c
===================================================================
--- linux-2.6.25-rc2.orig/kernel/sched.c
+++ linux-2.6.25-rc2/kernel/sched.c
@@ -3766,7 +3766,7 @@ void scheduler_tick(void)
 
 #if defined(CONFIG_PREEMPT) && defined(CONFIG_DEBUG_PREEMPT)
 
-void add_preempt_count(int val)
+void __kprobes add_preempt_count(int val)
 {
 	/*
 	 * Underflow?
@@ -3782,7 +3782,7 @@ void add_preempt_count(int val)
 }
 EXPORT_SYMBOL(add_preempt_count);
 
-void sub_preempt_count(int val)
+void __kprobes sub_preempt_count(int val)
 {
 	/*
 	 * Underflow?


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