[RFC PATCH v2 4/7] tracing/probe: Check event/group naming rule at parsing

[Masami Hiramatsu]

Check event and group naming rule at parsing it instead
of allocating probes.

Signed-off-by: Masami Hiramatsu <mhira...@kernel.org>
---
 Changes in v2:
  - Update error message according to Steve's comment.
---
 kernel/trace/trace_kprobe.c |    7 +------
 kernel/trace/trace_probe.c  |    8 ++++++++
 kernel/trace/trace_uprobe.c |    5 +----
 3 files changed, 10 insertions(+), 10 deletions(-)

diff --git a/kernel/trace/trace_kprobe.c b/kernel/trace/trace_kprobe.c
index d47e12596f12..5222fd82e7e4 100644
--- a/kernel/trace/trace_kprobe.c
+++ b/kernel/trace/trace_kprobe.c
@@ -221,7 +221,7 @@ static struct trace_kprobe *alloc_trace_kprobe(const char 
*group,
 
        tk->rp.maxactive = maxactive;
 
-       if (!event || !is_good_name(event)) {
+       if (!event || !group) {
                ret = -EINVAL;
                goto error;
        }
@@ -231,11 +231,6 @@ static struct trace_kprobe *alloc_trace_kprobe(const char 
*group,
        if (!tk->tp.call.name)
                goto error;
 
-       if (!group || !is_good_name(group)) {
-               ret = -EINVAL;
-               goto error;
-       }
-
        tk->tp.class.system = kstrdup(group, GFP_KERNEL);
        if (!tk->tp.class.system)
                goto error;
diff --git a/kernel/trace/trace_probe.c b/kernel/trace/trace_probe.c
index feae03056f0b..d2b73628f1e1 100644
--- a/kernel/trace/trace_probe.c
+++ b/kernel/trace/trace_probe.c
@@ -172,6 +172,10 @@ int traceprobe_parse_event_name(const char **pevent, const 
char **pgroup,
                        return -E2BIG;
                }
                strlcpy(buf, event, slash - event + 1);
+               if (!is_good_name(buf)) {
+                       pr_info("Group name must follow the same rules as C 
identifiers\n");
+                       return -EINVAL;
+               }
                *pgroup = buf;
                *pevent = slash + 1;
                event = *pevent;
@@ -184,6 +188,10 @@ int traceprobe_parse_event_name(const char **pevent, const 
char **pgroup,
                pr_info("Event name is too long\n");
                return -E2BIG;
        }
+       if (!is_good_name(event)) {
+               pr_info("Event name must follow the same rules as C 
identifiers\n");
+               return -EINVAL;
+       }
        return 0;
 }
 
diff --git a/kernel/trace/trace_uprobe.c b/kernel/trace/trace_uprobe.c
index e335576b9411..52f033489377 100644
--- a/kernel/trace/trace_uprobe.c
+++ b/kernel/trace/trace_uprobe.c
@@ -266,10 +266,7 @@ alloc_trace_uprobe(const char *group, const char *event, 
int nargs, bool is_ret)
 {
        struct trace_uprobe *tu;
 
-       if (!event || !is_good_name(event))
-               return ERR_PTR(-EINVAL);
-
-       if (!group || !is_good_name(group))
+       if (!event || !group)
                return ERR_PTR(-EINVAL);
 
        tu = kzalloc(SIZEOF_TRACE_UPROBE(nargs), GFP_KERNEL);