Commit d481ee35 authored by Steven Rostedt's avatar Steven Rostedt Committed by Steven Rostedt (Google)
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tracing: selftests: Add testing a user string to filters 

Running the following commands was broken:

  # cd /sys/kernel/tracing
  # echo "filename.ustring ~ \"/proc*\"" > events/syscalls/sys_enter_openat/filter
  # echo 1 > events/syscalls/sys_enter_openat/enable
  # ls /proc/$$/maps
  # cat trace

And would produce nothing when it should have produced something like:

      ls-1192    [007] .....  8169.828333: sys_openat(dfd: ffffffffffffff9c, filename: 7efc18359904, flags: 80000, mode: 0)

Add a test to check this case so that it will be caught if it breaks
again.

Link: https://lore.kernel.org/linux-trace-kernel/20250417183003.505835fb@gandalf.local.home/

Cc: Masami Hiramatsu <mhiramat@kernel.org>
Cc: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
Cc: Andrew Morton <akpm@linux-foundation.org>
Cc: Shuah Khan <skhan@linuxfoundation.org>
Link: https://lore.kernel.org/20250418101208.38dc81f5@gandalf.local.home


Signed-off-by: default avatarSteven Rostedt (Google) <rostedt@goodmis.org>
parent a8c5b0ed

tools/testing/selftests/ftrace/test.d/filter/event-filter-function.tc

+20 −0
Original line number Diff line number Diff line
@@ -80,6 +80,26 @@ if [ $misscnt -gt 0 ]; then 
	exit_fail

fi



# Check strings too

if [ -f events/syscalls/sys_enter_openat/filter ]; then

	DIRNAME=`basename $TMPDIR`

	echo "filename.ustring ~ \"*$DIRNAME*\"" > events/syscalls/sys_enter_openat/filter

	echo 1 > events/syscalls/sys_enter_openat/enable

	echo 1 > tracing_on

	ls /bin/sh

	nocnt=`grep openat trace | wc -l`

	ls $TMPDIR

	echo 0 > tracing_on

	hitcnt=`grep openat trace | wc -l`;

	echo 0 > events/syscalls/sys_enter_openat/enable

	if [ $nocnt -gt 0 ]; then

		exit_fail

	fi

	if [ $hitcnt -eq 0 ]; then

		exit_fail

	fi

fi



reset_events_filter



exit 0