Messages in this thread Patch in this message | | | From | Srinivasa Ds <> | Subject | [RFC] [PATCH] Refuse kprobe insertion on add/sub_preempt_counter() | Date | Wed, 20 Feb 2008 15:45:17 +0530 |
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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>
--- 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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