Commit fb5e2154 authored by Linus Torvalds's avatar Linus Torvalds
Browse files

Merge tag 'trace-v4.11-rc5-4' of git://git.kernel.org/pub/scm/linux/kernel/git/rostedt/linux-trace 

Pull ftrace testcase update from Steven Rostedt:
 "While testing my development branch, without the fix for the pid use
  after free bug, the selftest that Namhyung added triggers it. I
  figured it would be good to add the test for the bug after the fix,
  such that it does not exist without the fix.

  I added another patch that lets the test only test part of the pid
  filtering, and ignores the function-fork (filtering on children as
  well) if the function-fork feature does not exist. This feature is
  added by Namhyung just before he added this test. But since the test
  tests both with and without the feature, it would be good to let it
  not fail if the feature does not exist"

* tag 'trace-v4.11-rc5-4' of git://git.kernel.org/pub/scm/linux/kernel/git/rostedt/linux-trace:
  selftests: ftrace: Add check for function-fork before running pid filter test
  selftests: ftrace: Add a testcase for function PID filter
parents 0bad6d7e 9ed19c76

tools/testing/selftests/ftrace/test.d/ftrace/func-filter-pid.tc

0 → 100644
+117 −0
Original line number Diff line number Diff line 
#!/bin/sh

# description: ftrace - function pid filters



# Make sure that function pid matching filter works.

# Also test it on an instance directory



if ! grep -q function available_tracers; then

    echo "no function tracer configured"

    exit_unsupported

fi



if [ ! -f set_ftrace_pid ]; then

    echo "set_ftrace_pid not found? Is function tracer not set?"

    exit_unsupported

fi



if [ ! -f set_ftrace_filter ]; then

    echo "set_ftrace_filter not found? Is function tracer not set?"

    exit_unsupported

fi



do_function_fork=1



if [ ! -f options/function-fork ]; then

    do_function_fork=0

    echo "no option for function-fork found. Option will not be tested."

fi



read PID _ < /proc/self/stat



if [ $do_function_fork -eq 1 ]; then

    # default value of function-fork option

    orig_value=`grep function-fork trace_options`

fi



do_reset() {

    reset_tracer

    clear_trace

    enable_tracing

    echo > set_ftrace_filter

    echo > set_ftrace_pid



    if [ $do_function_fork -eq 0 ]; then

	return

    fi



    echo $orig_value > trace_options

}



fail() { # msg

    do_reset

    echo $1

    exit $FAIL

}



yield() {

    ping localhost -c 1 || sleep .001 || usleep 1 || sleep 1

}



do_test() {

    disable_tracing



    echo do_execve* > set_ftrace_filter

    echo *do_fork >> set_ftrace_filter



    echo $PID > set_ftrace_pid

    echo function > current_tracer



    if [ $do_function_fork -eq 1 ]; then

	# don't allow children to be traced

	echo nofunction-fork > trace_options

    fi



    enable_tracing

    yield



    count_pid=`cat trace | grep -v ^# | grep $PID | wc -l`

    count_other=`cat trace | grep -v ^# | grep -v $PID | wc -l`



    # count_other should be 0

    if [ $count_pid -eq 0 -o $count_other -ne 0 ]; then

	fail "PID filtering not working?"

    fi



    disable_tracing

    clear_trace



    if [ $do_function_fork -eq 0 ]; then

	return

    fi



    # allow children to be traced

    echo function-fork > trace_options



    enable_tracing

    yield



    count_pid=`cat trace | grep -v ^# | grep $PID | wc -l`

    count_other=`cat trace | grep -v ^# | grep -v $PID | wc -l`



    # count_other should NOT be 0

    if [ $count_pid -eq 0 -o $count_other -eq 0 ]; then

	fail "PID filtering not following fork?"

    fi

}



do_test



mkdir instances/foo

cd instances/foo

do_test

cd ../../

rmdir instances/foo



do_reset



exit 0

CRA Git | Maintained and supported by SUSTech CRA and CCSE