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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>
This commit is contained in:
Srinivasa Ds 2008-02-23 15:24:04 -08:00 committed by Linus Torvalds
parent 0835ab53ea
commit 4362758279
1 changed files with 2 additions and 2 deletions
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4
kernel/sched.c
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@ -3766,7 +3766,7 @@ void scheduler_tick(void)
#if defined(CONFIG_PREEMPT) && defined(CONFIG_DEBUG_PREEMPT) #if defined(CONFIG_PREEMPT) && defined(CONFIG_DEBUG_PREEMPT)
void add_preempt_count(int val) void __kprobes add_preempt_count(int val)
{ {
/* /*
* Underflow? * Underflow?
@ -3782,7 +3782,7 @@ void add_preempt_count(int val)
} }
EXPORT_SYMBOL(add_preempt_count); EXPORT_SYMBOL(add_preempt_count);
void sub_preempt_count(int val) void __kprobes sub_preempt_count(int val)
{ {
/* /*
* Underflow? * Underflow?