From 8e242060c6a4947e8ae7d29794af6a581db08841 Mon Sep 17 00:00:00 2001 From: Masami Hiramatsu Date: Thu, 19 Aug 2021 19:26:02 +0900 Subject: tracing/probes: Reject events which have the same name of existing one Since kprobe_events and uprobe_events only check whether the other same-type probe event has the same name or not, if the user gives the same name of the existing tracepoint event (or the other type of probe events), it silently fails to create the tracefs entry (but registered.) as below. /sys/kernel/tracing # ls events/task/task_rename enable filter format hist id trigger /sys/kernel/tracing # echo p:task/task_rename vfs_read >> kprobe_events [ 113.048508] Could not create tracefs 'task_rename' directory /sys/kernel/tracing # cat kprobe_events p:task/task_rename vfs_read To fix this issue, check whether the existing events have the same name or not in trace_probe_register_event_call(). If exists, it rejects to register the new event. Link: https://lkml.kernel.org/r/162936876189.187130.17558311387542061930.stgit@devnote2 Signed-off-by: Masami Hiramatsu Signed-off-by: Steven Rostedt (VMware) --- kernel/trace/trace_kprobe.c | 6 +++++- kernel/trace/trace_probe.c | 25 +++++++++++++++++++++++++ kernel/trace/trace_probe.h | 1 + kernel/trace/trace_uprobe.c | 6 +++++- 4 files changed, 36 insertions(+), 2 deletions(-) diff --git a/kernel/trace/trace_kprobe.c b/kernel/trace/trace_kprobe.c index 4b013d24f5a9..882c27044029 100644 --- a/kernel/trace/trace_kprobe.c +++ b/kernel/trace/trace_kprobe.c @@ -647,7 +647,11 @@ static int register_trace_kprobe(struct trace_kprobe *tk) /* Register new event */ ret = register_kprobe_event(tk); if (ret) { - pr_warn("Failed to register probe event(%d)\n", ret); + if (ret == -EEXIST) { + trace_probe_log_set_index(0); + trace_probe_log_err(0, EVENT_EXIST); + } else + pr_warn("Failed to register probe event(%d)\n", ret); goto end; } diff --git a/kernel/trace/trace_probe.c b/kernel/trace/trace_probe.c index 9c9c83a063b2..782c00eb6859 100644 --- a/kernel/trace/trace_probe.c +++ b/kernel/trace/trace_probe.c @@ -1047,11 +1047,36 @@ error: return ret; } +static struct trace_event_call * +find_trace_event_call(const char *system, const char *event_name) +{ + struct trace_event_call *tp_event; + const char *name; + + list_for_each_entry(tp_event, &ftrace_events, list) { + if (!tp_event->class->system || + strcmp(system, tp_event->class->system)) + continue; + name = trace_event_name(tp_event); + if (!name || strcmp(event_name, name)) + continue; + return tp_event; + } + + return NULL; +} + int trace_probe_register_event_call(struct trace_probe *tp) { struct trace_event_call *call = trace_probe_event_call(tp); int ret; + lockdep_assert_held(&event_mutex); + + if (find_trace_event_call(trace_probe_group_name(tp), + trace_probe_name(tp))) + return -EEXIST; + ret = register_trace_event(&call->event); if (!ret) return -ENODEV; diff --git a/kernel/trace/trace_probe.h b/kernel/trace/trace_probe.h index 8adf5f3542a6..66701a92d186 100644 --- a/kernel/trace/trace_probe.h +++ b/kernel/trace/trace_probe.h @@ -404,6 +404,7 @@ extern int traceprobe_define_arg_fields(struct trace_event_call *event_call, C(NO_EVENT_NAME, "Event name is not specified"), \ C(EVENT_TOO_LONG, "Event name is too long"), \ C(BAD_EVENT_NAME, "Event name must follow the same rules as C identifiers"), \ + C(EVENT_EXIST, "Given group/event name is already used by another event"), \ C(RETVAL_ON_PROBE, "$retval is not available on probe"), \ C(BAD_STACK_NUM, "Invalid stack number"), \ C(BAD_ARG_NUM, "Invalid argument number"), \ diff --git a/kernel/trace/trace_uprobe.c b/kernel/trace/trace_uprobe.c index d219ba50efbd..225ce569bf8f 100644 --- a/kernel/trace/trace_uprobe.c +++ b/kernel/trace/trace_uprobe.c @@ -515,7 +515,11 @@ static int register_trace_uprobe(struct trace_uprobe *tu) ret = register_uprobe_event(tu); if (ret) { - pr_warn("Failed to register probe event(%d)\n", ret); + if (ret == -EEXIST) { + trace_probe_log_set_index(0); + trace_probe_log_err(0, EVENT_EXIST); + } else + pr_warn("Failed to register probe event(%d)\n", ret); goto end; } -- cgit v1.2.3