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    Subject[RFC] [PATCH] Refuse kprobe insertion on add/sub_preempt_counter()
    Date
    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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