Commit ee9793be authored by Steven Rostedt (Google)'s avatar Steven Rostedt (Google) Committed by Shuah Khan
Browse files

tracing/selftests: Add ownership modification tests for eventfs 



As there were bugs found with the ownership of eventfs dynamic file
creation. Add a test to test it.

It will remount tracefs with a different gid and check the ownership of
the eventfs directory, as well as the system and event directories. It
will also check the event file directories.

It then does a chgrp on each of these as well to see if they all get
updated as expected.

Then it remounts the tracefs file system back to the original group and
makes sure that all the updated files and directories were reset back to
the original ownership.

It does the same for instances that change the ownership of he instance
directory.

Note, because the uid is not reset by a remount, it is tested for every
file by switching it to a new owner and then back again.

Acked-by: default avatarMasami Hiramatsu (Google) <mhiramat@kernel.org>
Tested-by: default avatarMasami Hiramatsu (Google) <mhiramat@kernel.org>
Signed-off-by: default avatarSteven Rostedt (Google) <rostedt@goodmis.org>
Signed-off-by: default avatarShuah Khan <skhan@linuxfoundation.org>
parent 130a8387

tools/testing/selftests/ftrace/test.d/00basic/test_ownership.tc

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#!/bin/sh

# SPDX-License-Identifier: GPL-2.0

# description: Test file and directory owership changes for eventfs



original_group=`stat -c "%g" .`

original_owner=`stat -c "%u" .`



mount_point=`stat -c '%m' .`

mount_options=`mount | grep "$mount_point" | sed -e 's/.*(\(.*\)).*/\1/'`



# find another owner and group that is not the original

other_group=`tac /etc/group | grep -v ":$original_group:" | head -1 | cut -d: -f3`

other_owner=`tac /etc/passwd | grep -v ":$original_owner:" | head -1 | cut -d: -f3`



# Remove any group ownership already

new_options=`echo "$mount_options" | sed -e "s/gid=[0-9]*/gid=$other_group/"`



if [ "$new_options" = "$mount_options" ]; then

	new_options="$mount_options,gid=$other_group"

	mount_options="$mount_options,gid=$original_group"

fi



canary="events/timer events/timer/timer_cancel events/timer/timer_cancel/format"



test() {

	file=$1

	test_group=$2



	owner=`stat -c "%u" $file`

	group=`stat -c "%g" $file`



	echo "testing $file $owner=$original_owner and $group=$test_group"

	if [ $owner -ne $original_owner ]; then

		exit_fail

	fi

	if [ $group -ne $test_group ]; then

		exit_fail

	fi



	# Note, the remount does not update ownership so test going to and from owner

	echo "test owner $file to $other_owner"

	chown $other_owner $file

	owner=`stat -c "%u" $file`

	if [ $owner -ne $other_owner ]; then

		exit_fail

	fi



	chown $original_owner $file

	owner=`stat -c "%u" $file`

	if [ $owner -ne $original_owner ]; then

		exit_fail

	fi



}



run_tests() {

	for d in "." "events" "events/sched" "events/sched/sched_switch" "events/sched/sched_switch/enable" $canary; do

		test "$d" $other_group

	done



	chgrp $original_group events

	test "events" $original_group

	for d in "." "events/sched" "events/sched/sched_switch" "events/sched/sched_switch/enable" $canary; do

		test "$d" $other_group

	done



	chgrp $original_group events/sched

	test "events/sched" $original_group

	for d in "." "events/sched/sched_switch" "events/sched/sched_switch/enable" $canary; do

		test "$d" $other_group

	done



	chgrp $original_group events/sched/sched_switch

	test "events/sched/sched_switch" $original_group

	for d in "." "events/sched/sched_switch/enable" $canary; do

		test "$d" $other_group

	done



	chgrp $original_group events/sched/sched_switch/enable

	test "events/sched/sched_switch/enable" $original_group

	for d in "." $canary; do

		test "$d" $other_group

	done

}



mount -o remount,"$new_options" .



run_tests



mount -o remount,"$mount_options" .



for d in "." "events" "events/sched" "events/sched/sched_switch" "events/sched/sched_switch/enable" $canary; do

	test "$d" $original_group

done



# check instances as well



chgrp $other_group instances



instance="$(mktemp -u test-XXXXXX)"



mkdir instances/$instance



cd instances/$instance



run_tests



cd ../..



rmdir instances/$instance



chgrp $original_group instances



exit 0