diff options
Diffstat (limited to 'arch/x86/kernel/kprobes/ftrace.c')
| -rw-r--r-- | arch/x86/kernel/kprobes/ftrace.c | 9 |
1 files changed, 6 insertions, 3 deletions
diff --git a/arch/x86/kernel/kprobes/ftrace.c b/arch/x86/kernel/kprobes/ftrace.c index 717b02a22e67..5f8f0b3cc674 100644 --- a/arch/x86/kernel/kprobes/ftrace.c +++ b/arch/x86/kernel/kprobes/ftrace.c @@ -27,7 +27,7 @@ static nokprobe_inline int __skip_singlestep(struct kprobe *p, struct pt_regs *regs, - struct kprobe_ctlblk *kcb) + struct kprobe_ctlblk *kcb, unsigned long orig_ip) { /* * Emulate singlestep (and also recover regs->ip) @@ -39,6 +39,8 @@ int __skip_singlestep(struct kprobe *p, struct pt_regs *regs, p->post_handler(p, regs, 0); } __this_cpu_write(current_kprobe, NULL); + if (orig_ip) + regs->ip = orig_ip; return 1; } @@ -46,7 +48,7 @@ int skip_singlestep(struct kprobe *p, struct pt_regs *regs, struct kprobe_ctlblk *kcb) { if (kprobe_ftrace(p)) - return __skip_singlestep(p, regs, kcb); + return __skip_singlestep(p, regs, kcb, 0); else return 0; } @@ -71,13 +73,14 @@ void kprobe_ftrace_handler(unsigned long ip, unsigned long parent_ip, if (kprobe_running()) { kprobes_inc_nmissed_count(p); } else { + unsigned long orig_ip = regs->ip; /* 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; if (!p->pre_handler || !p->pre_handler(p, regs)) - __skip_singlestep(p, regs, kcb); + __skip_singlestep(p, regs, kcb, orig_ip); /* * If pre_handler returns !0, it sets regs->ip and * resets current kprobe. |