From 4b036d54bf849a75d0103b33d92a53f89ecb9315 Mon Sep 17 00:00:00 2001 From: Masami Hiramatsu Date: Wed, 5 Sep 2012 23:31:12 +0900 Subject: [PATCH] kprobes/x86: Fix kprobes to collectly handle IP on ftrace Current kprobe_ftrace_handler expects regs->ip == ip, but it is incorrect (originally on x86-64). Actually, ftrace handler sets regs->ip = ip + MCOUNT_INSN_SIZE. kprobe_ftrace_handler must take care for that. Link: http://lkml.kernel.org/r/20120905143112.10329.72069.stgit@localhost.localdomain Cc: Peter Zijlstra Cc: Frederic Weisbecker Cc: Thomas Gleixner Cc: "H. Peter Anvin" Signed-off-by: Masami Hiramatsu Signed-off-by: Steven Rostedt --- arch/x86/kernel/kprobes.c | 9 ++++++--- 1 file changed, 6 insertions(+), 3 deletions(-) diff --git a/arch/x86/kernel/kprobes.c b/arch/x86/kernel/kprobes.c index 47ae1023a93c..f49f60cca40d 100644 --- a/arch/x86/kernel/kprobes.c +++ b/arch/x86/kernel/kprobes.c @@ -1072,7 +1072,8 @@ void __kprobes kprobe_ftrace_handler(unsigned long ip, unsigned long parent_ip, if (kprobe_running()) { kprobes_inc_nmissed_count(p); } else { - regs->ip += sizeof(kprobe_opcode_t); + /* Kprobe handler expects regs->ip = ip + 1 as breakpoint hit */ + regs->ip = ip + sizeof(kprobe_opcode_t); __this_cpu_write(current_kprobe, p); kcb->kprobe_status = KPROBE_HIT_ACTIVE; @@ -1080,13 +1081,15 @@ void __kprobes kprobe_ftrace_handler(unsigned long ip, unsigned long parent_ip, p->pre_handler(p, regs); if (unlikely(p->post_handler)) { - /* Emulate singlestep as if there is a 5byte nop */ + /* + * Emulate singlestep (and also recover regs->ip) + * as if there is a 5byte nop + */ regs->ip = ip + MCOUNT_INSN_SIZE; kcb->kprobe_status = KPROBE_HIT_SSDONE; p->post_handler(p, regs, 0); } __this_cpu_write(current_kprobe, NULL); - regs->ip = ip; /* Recover for next callback */ } end: local_irq_restore(flags); -- 2.20.1