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Subject[PATCH 4.4 083/190] perf probe: Add warning message if there is unexpected event name
Date
4.4-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Masami Hiramatsu <mhiramat@kernel.org>


[ Upstream commit 9f5c6d8777a2d962b0eeacb2a16f37da6bea545b ]

This improve the error message so that user can know event-name error
before writing new events to kprobe-events interface.

E.g.
======
#./perf probe -x /lib64/libc-2.25.so malloc_get_state*
Internal error: "malloc_get_state@GLIBC_2" is an invalid event name.
Error: Failed to add events.
======

Reported-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Signed-off-by: Masami Hiramatsu <mhiramat@kernel.org>
Acked-by: Ravi Bangoria <ravi.bangoria@linux.vnet.ibm.com>
Reviewed-by: Thomas Richter <tmricht@linux.vnet.ibm.com>
Tested-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Cc: Paul Clarke <pc@us.ibm.com>
Cc: bhargavb <bhargavaramudu@gmail.com>
Cc: linux-rt-users@vger.kernel.org
Link: http://lkml.kernel.org/r/151275040665.24652.5188568529237584489.stgit@devbox
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Signed-off-by: Sasha Levin <alexander.levin@microsoft.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
tools/perf/util/probe-event.c | 8 ++++++++
1 file changed, 8 insertions(+)

--- a/tools/perf/util/probe-event.c
+++ b/tools/perf/util/probe-event.c
@@ -2349,6 +2349,14 @@ static int get_new_event_name(char *buf,

out:
free(nbase);
+
+ /* Final validation */
+ if (ret >= 0 && !is_c_func_name(buf)) {
+ pr_warning("Internal error: \"%s\" is an invalid event name.\n",
+ buf);
+ ret = -EINVAL;
+ }
+
return ret;
}


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