diff options
Diffstat (limited to 'kernel/trace/trace_kprobe.c')
| -rw-r--r-- | kernel/trace/trace_kprobe.c | 47 |
1 files changed, 38 insertions, 9 deletions
diff --git a/kernel/trace/trace_kprobe.c b/kernel/trace/trace_kprobe.c index 0534eb8b7640..25662a780fdf 100644 --- a/kernel/trace/trace_kprobe.c +++ b/kernel/trace/trace_kprobe.c @@ -87,6 +87,21 @@ static nokprobe_inline unsigned long trace_kprobe_nhit(struct trace_kprobe *tk) return nhit; } +static nokprobe_inline +unsigned long trace_kprobe_address(struct trace_kprobe *tk) +{ + unsigned long addr; + + if (tk->symbol) { + addr = (unsigned long) + kallsyms_lookup_name(trace_kprobe_symbol(tk)); + addr += tk->rp.kp.offset; + } else { + addr = (unsigned long)tk->rp.kp.addr; + } + return addr; +} + bool trace_kprobe_on_func_entry(struct trace_event_call *call) { struct trace_kprobe *tk = (struct trace_kprobe *)call->data; @@ -99,16 +114,8 @@ bool trace_kprobe_on_func_entry(struct trace_event_call *call) bool trace_kprobe_error_injectable(struct trace_event_call *call) { struct trace_kprobe *tk = (struct trace_kprobe *)call->data; - unsigned long addr; - if (tk->symbol) { - addr = (unsigned long) - kallsyms_lookup_name(trace_kprobe_symbol(tk)); - addr += tk->rp.kp.offset; - } else { - addr = (unsigned long)tk->rp.kp.addr; - } - return within_error_injection_list(addr); + return within_error_injection_list(trace_kprobe_address(tk)); } static int register_kprobe_event(struct trace_kprobe *tk); @@ -504,6 +511,22 @@ disable_trace_kprobe(struct trace_kprobe *tk, struct trace_event_file *file) return ret; } +#if defined(CONFIG_KPROBES_ON_FTRACE) && \ + !defined(CONFIG_KPROBE_EVENTS_ON_NOTRACE) +static bool within_notrace_func(struct trace_kprobe *tk) +{ + unsigned long offset, size, addr; + + addr = trace_kprobe_address(tk); + if (!kallsyms_lookup_size_offset(addr, &size, &offset)) + return true; /* Out of range. */ + + return !ftrace_location_range(addr - offset, addr - offset + size); +} +#else +#define within_notrace_func(tk) (false) +#endif + /* Internal register function - just handle k*probes and flags */ static int __register_trace_kprobe(struct trace_kprobe *tk) { @@ -512,6 +535,12 @@ static int __register_trace_kprobe(struct trace_kprobe *tk) if (trace_probe_is_registered(&tk->tp)) return -EINVAL; + if (within_notrace_func(tk)) { + pr_warn("Could not probe notrace function %s\n", + trace_kprobe_symbol(tk)); + return -EINVAL; + } + for (i = 0; i < tk->tp.nr_args; i++) traceprobe_update_arg(&tk->tp.args[i]); |