In recent linux kernel version, kretprobe in IA32 is implemented in
kretprobe_trampoline. And break trap code is removed from
retprobe_trampoline, instead trampoline_handler is called directly.
Currently if kretprobe hander hit one trap which causes another
kretprobe, there will be SPINLOCK recursive bug. This patch fixes this,
and will skip trap during kretprobe handler execution. This patch is
based on 2.6.16-rc6-mm2.
--- arch/i386/kernel/kprobes.c.bak 2006-03-21 10:35:34.000000000 +0800
+++ arch/i386/kernel/kprobes.c 2006-03-21 10:37:44.000000000 +0800
@@ -390,8 +390,11 @@ fastcall void *__kprobes trampoline_hand
/* another task is sharing our hash bucket */
continue;
- if (ri->rp && ri->rp->handler)
+ if (ri->rp && ri->rp->handler){
+ __get_cpu_var(current_kprobe) = &ri->rp->kp;
ri->rp->handler(ri, regs);
+ __get_cpu_var(current_kprobe) = NULL;
+ }
orig_ret_address = (unsigned long)ri->ret_addr;
recycle_rp_inst(ri);
-
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