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authorMasami Hiramatsu <mhiramat@redhat.com>2009-08-27 13:23:04 -0400
committerFrederic Weisbecker <fweisbec@gmail.com>2009-08-30 03:08:26 +0200
commitf5ad31158d60946b9fd18c8a79c283a6bc432430 (patch)
tree6276ab1eff3f88ec318c5f9346a3e37c5002b2d0 /arch/x86/kernel/kprobes.c
parente9afe9e1b3fdbd56cca53959a2519e70db9c8095 (diff)
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>
Diffstat (limited to 'arch/x86/kernel/kprobes.c')
-rw-r--r--arch/x86/kernel/kprobes.c11
1 files changed, 0 insertions, 11 deletions
diff --git a/arch/x86/kernel/kprobes.c b/arch/x86/kernel/kprobes.c
index e0fb615ba1e..c5f1f117e0c 100644
--- a/arch/x86/kernel/kprobes.c
+++ b/arch/x86/kernel/kprobes.c
@@ -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);