tracing/kprobe: Fix handling of C-unlike argument names

Check the argument name whether it is invalid (not C-like symbol name). This
makes event format simple.

Reported-by: Srikar Dronamraju <srikar@linux.vnet.ibm.com>
Cc: Steven Rostedt <rostedt@goodmis.org>
Cc: Frederic Weisbecker <fweisbec@gmail.com>
Cc: Ingo Molnar <mingo@redhat.com>
Cc: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
LKML-Reference: <20100827113912.22882.62313.stgit@ltc236.sdl.hitachi.co.jp>
Signed-off-by: Masami Hiramatsu <masami.hiramatsu.pt@hitachi.com>
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>

diff --git a/kernel/trace/trace_kprobe.c b/kernel/trace/trace_kprobe.c
index a39251ef1a7b5dbeee17c99fa427df66121369a6..544301d29dee45b0dc089db788bcfe89687bfa45 100644 (file)
--- a/kernel/trace/trace_kprobe.c
+++ b/kernel/trace/trace_kprobe.c
@@ -514,8 +514,8 @@ static int kprobe_dispatcher(struct kprobe *kp, struct pt_regs *regs);
 static int kretprobe_dispatcher(struct kretprobe_instance *ri,
                                struct pt_regs *regs);
 
-/* Check the name is good for event/group */
-static int check_event_name(const char *name)
+/* Check the name is good for event/group/fields */
+static int is_good_name(const char *name)
 {
        if (!isalpha(*name) && *name != '_')
                return 0;
@@ -557,7 +557,7 @@ static struct trace_probe *alloc_trace_probe(const char *group,
        else
                tp->rp.kp.pre_handler = kprobe_dispatcher;
 
-       if (!event || !check_event_name(event)) {
+       if (!event || !is_good_name(event)) {
                ret = -EINVAL;
                goto error;
        }
@@ -567,7 +567,7 @@ static struct trace_probe *alloc_trace_probe(const char *group,
        if (!tp->call.name)
                goto error;
 
-       if (!group || !check_event_name(group)) {
+       if (!group || !is_good_name(group)) {
                ret = -EINVAL;
                goto error;
        }
@@ -883,7 +883,7 @@ static int create_trace_probe(int argc, char **argv)
        int i, ret = 0;
        int is_return = 0, is_delete = 0;
        char *symbol = NULL, *event = NULL, *group = NULL;
-       char *arg, *tmp;
+       char *arg;
        unsigned long offset = 0;
        void *addr = NULL;
        char buf[MAX_EVENT_NAME_LEN];
@@ -1012,9 +1012,13 @@ static int create_trace_probe(int argc, char **argv)
                        ret = -ENOMEM;
                        goto error;
                }
-               tmp = strchr(tp->args[i].name, ':');
-               if (tmp)
-                       *tmp = '_';     /* convert : to _ */
+
+               if (!is_good_name(tp->args[i].name)) {
+                       pr_info("Invalid argument[%d] name: %s\n",
+                               i, tp->args[i].name);
+                       ret = -EINVAL;
+                       goto error;
+               }
 
                if (conflict_field_name(tp->args[i].name, tp->args, i)) {
                        pr_info("Argument[%d] name '%s' conflicts with "