Commit 43627582 authored Feb 23, 2008 by Srinivasa Ds Committed by Linus Torvalds Feb 23, 2008

kprobes: 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@in.ibm.com>
Acked-by: Ananth N Mavinakayanahalli <ananth@in.ibm.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

parent 0835ab53

kernel/sched.c

+2 −2

Original line number	Diff line number	Diff line
		@@ -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?