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kprobes/x86-64: Allow to reenter probe on post_handler 

Allow to reenter probe on the post_handler of another probe on x86-64,
because x86-64 already allows reentering int3.
In that case, reentered probe just increases kp.nmissed and returns.

Signed-off-by: Masami Hiramatsu <mhiramat@redhat.com>
Acked-by: Ananth N Mavinakayanahalli <ananth@in.ibm.com>
Cc: Ingo Molnar <mingo@elte.hu>
LKML-Reference: <20090827172304.8246.4822.stgit@localhost.localdomain>
Signed-off-by: Frederic Weisbecker <fweisbec@gmail.com>
This commit is contained in:
Masami Hiramatsu 2009-08-27 13:23:04 -04:00 committed by Frederic Weisbecker
parent e9afe9e1b3
commit f5ad31158d
1 changed files with 0 additions and 11 deletions
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11
arch/x86/kernel/kprobes.c
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@ -463,17 +463,6 @@ static int __kprobes reenter_kprobe(struct kprobe *p, struct pt_regs *regs,
{
switch (kcb->kprobe_status) {
case KPROBE_HIT_SSDONE:
#ifdef CONFIG_X86_64
/* TODO: Provide re-entrancy from post_kprobes_handler() and
* avoid exception stack corruption while single-stepping on
* the instruction of the new probe.
*/
arch_disarm_kprobe(p);
regs->ip = (unsigned long)p->addr;
reset_current_kprobe();
preempt_enable_no_resched();
break;
#endif
case KPROBE_HIT_ACTIVE:
save_previous_kprobe(kcb);
set_current_kprobe(p, regs, kcb);