4.4-stable review patch. If anyone has any objections, please let me know.
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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; }