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tracing: selftests: Add testing a user string to filters

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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: Steven Rostedt (Google) <rostedt@goodmis.org>
This commit is contained in:
Steven Rostedt 2025-04-18 10:12:08 -04:00 committed by Steven Rostedt (Google)
parent a8c5b0ed89
commit d481ee3524
1 changed files with 20 additions and 0 deletions
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20
tools/testing/selftests/ftrace/test.d/filter/event-filter-function.tc
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@ -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