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#!/bin/bash
# SPDX-License-Identifier: GPL-2.0-or-later OR copyleft-next-0.3.1
# Copyright (C) 2017 Luis R. Rodriguez <mcgrof@kernel.org>
#
# This is a stress test script for kmod, the kernel module loader. It uses
# test_kmod which exposes a series of knobs for the API for us so we can
# tweak each test in userspace rather than in kernelspace.
#
# The way kmod works is it uses the kernel's usermode helper API to eventually
# call /sbin/modprobe. It has a limit of the number of concurrent calls
# possible. The kernel interface to load modules is request_module(), however
# mount uses get_fs_type(). Both behave slightly differently, but the
# differences are important enough to test each call separately. For this
# reason test_kmod starts by providing tests for both calls.
#
# The test driver test_kmod assumes a series of defaults which you can
# override by exporting to your environment prior running this script.
# For instance this script assumes you do not have xfs loaded upon boot.
# If this is false, export DEFAULT_KMOD_FS="ext4" prior to running this
# script if the filesystem module you don't have loaded upon bootup
# is ext4 instead. Refer to allow_user_defaults() for a list of user
# override variables possible.
#
# You'll want at least 4 GiB of RAM to expect to run these tests
# without running out of memory on them. For other requirements refer
# to test_reqs()
set -e
TEST_NAME="kmod"
TEST_DRIVER="test_${TEST_NAME}"
TEST_DIR=$(dirname $0)
# This represents
#
# TEST_ID:TEST_COUNT:ENABLED
#
# TEST_ID: is the test id number
# TEST_COUNT: number of times we should run the test
# ENABLED: 1 if enabled, 0 otherwise
#
# Once these are enabled please leave them as-is. Write your own test,
# we have tons of space.
ALL_TESTS="0001:3:1"
ALL_TESTS="$ALL_TESTS 0002:3:1"
ALL_TESTS="$ALL_TESTS 0003:1:1"
ALL_TESTS="$ALL_TESTS 0004:1:1"
ALL_TESTS="$ALL_TESTS 0005:10:1"
ALL_TESTS="$ALL_TESTS 0006:10:1"
ALL_TESTS="$ALL_TESTS 0007:5:1"
ALL_TESTS="$ALL_TESTS 0008:150:1"
ALL_TESTS="$ALL_TESTS 0009:150:1"
ALL_TESTS="$ALL_TESTS 0010:1:1"
ALL_TESTS="$ALL_TESTS 0011:1:1"
ALL_TESTS="$ALL_TESTS 0012:1:1"
ALL_TESTS="$ALL_TESTS 0013:1:1"
# Kselftest framework requirement - SKIP code is 4.
ksft_skip=4
test_modprobe()
{
if [ ! -d $DIR ]; then
echo "$0: $DIR not present" >&2
echo "You must have the following enabled in your kernel:" >&2
cat $TEST_DIR/config >&2
exit $ksft_skip
fi
}
function allow_user_defaults()
{
if [ -z $DEFAULT_KMOD_DRIVER ]; then
DEFAULT_KMOD_DRIVER="test_module"
fi
if [ -z $DEFAULT_KMOD_FS ]; then
DEFAULT_KMOD_FS="xfs"
fi
if [ -z $PROC_DIR ]; then
PROC_DIR="/proc/sys/kernel/"
fi
if [ -z $MODPROBE_LIMIT ]; then
MODPROBE_LIMIT=50
fi
if [ -z $DIR ]; then
DIR="/sys/devices/virtual/misc/${TEST_DRIVER}0/"
fi
if [ -z $DEFAULT_NUM_TESTS ]; then
DEFAULT_NUM_TESTS=150
fi
MODPROBE_LIMIT_FILE="${PROC_DIR}/kmod-limit"
}
test_reqs()
{
if ! which modprobe 2> /dev/null > /dev/null; then
echo "$0: You need modprobe installed" >&2
exit $ksft_skip
fi
if ! which kmod 2> /dev/null > /dev/null; then
echo "$0: You need kmod installed" >&2
exit $ksft_skip
fi
# kmod 19 has a bad bug where it returns 0 when modprobe
# gets called *even* if the module was not loaded due to
# some bad heuristics. For details see:
#
# A work around is possible in-kernel but its rather
# complex.
KMOD_VERSION=$(kmod --version | awk '{print $3}')
if [[ $KMOD_VERSION -le 19 ]]; then
echo "$0: You need at least kmod 20" >&2
echo "kmod <= 19 is buggy, for details see:" >&2
echo "https://git.kernel.org/cgit/utils/kernel/kmod/kmod.git/commit/libkmod/libkmod-module.c?id=fd44a98ae2eb5eb32161088954ab21e58e19dfc4" >&2
exit $ksft_skip
fi
uid=$(id -u)
if [ $uid -ne 0 ]; then
echo $msg must be run as root >&2
exit $ksft_skip
fi
}
function load_req_mod()
{
trap "test_modprobe" EXIT
if [ ! -d $DIR ]; then
# Alanis: "Oh isn't it ironic?"
modprobe $TEST_DRIVER
fi
}
test_finish()
{
echo "$MODPROBE" > /proc/sys/kernel/modprobe
echo "Test completed"
}
errno_name_to_val()
{
case "$1" in
# kmod calls modprobe and upon of a module not found
# modprobe returns just 1... However in the kernel we
# *sometimes* see 256...
MODULE_NOT_FOUND)
echo 256;;
SUCCESS)
echo 0;;
-EPERM)
echo -1;;
-ENOENT)
echo -2;;
-EINVAL)
echo -22;;
-ERR_ANY)
echo -123456;;
*)
echo invalid;;
esac
}
errno_val_to_name()
case "$1" in
256)
echo MODULE_NOT_FOUND;;
0)
echo SUCCESS;;
-1)
echo -EPERM;;
-2)
echo -ENOENT;;
-22)
echo -EINVAL;;
-123456)
echo -ERR_ANY;;
*)
echo invalid;;
esac
config_set_test_case_driver()
{
if ! echo -n 1 >$DIR/config_test_case; then
echo "$0: Unable to set to test case to driver" >&2
exit 1
fi
}
config_set_test_case_fs()
{
if ! echo -n 2 >$DIR/config_test_case; then
echo "$0: Unable to set to test case to fs" >&2
exit 1
fi
}
config_num_threads()
{
if ! echo -n $1 >$DIR/config_num_threads; then
echo "$0: Unable to set to number of threads" >&2
exit 1
fi
}
config_get_modprobe_limit()
{
if [[ -f ${MODPROBE_LIMIT_FILE} ]] ; then
MODPROBE_LIMIT=$(cat $MODPROBE_LIMIT_FILE)
fi
echo $MODPROBE_LIMIT
}
config_num_thread_limit_extra()
{
MODPROBE_LIMIT=$(config_get_modprobe_limit)
let EXTRA_LIMIT=$MODPROBE_LIMIT+$1
config_num_threads $EXTRA_LIMIT
}
# For special characters use printf directly,
# refer to kmod_test_0001
config_set_driver()
{
if ! echo -n $1 >$DIR/config_test_driver; then
echo "$0: Unable to set driver" >&2
exit 1
fi
}
config_set_fs()
{
if ! echo -n $1 >$DIR/config_test_fs; then
echo "$0: Unable to set driver" >&2
exit 1
fi
}
config_get_driver()
{
cat $DIR/config_test_driver
}
config_get_test_result()
{
cat $DIR/test_result
}
config_reset()
{
if ! echo -n "1" >"$DIR"/reset; then
echo "$0: reset should have worked" >&2
exit 1
fi
}
config_show_config()
{
echo "----------------------------------------------------"
cat "$DIR"/config
echo "----------------------------------------------------"
}
config_trigger()
{
if ! echo -n "1" >"$DIR"/trigger_config 2>/dev/null; then
echo "$1: FAIL - loading should have worked"
config_show_config
exit 1
fi
echo "$1: OK! - loading kmod test"
}
config_trigger_want_fail()
{
if echo "1" > $DIR/trigger_config 2>/dev/null; then
echo "$1: FAIL - test case was expected to fail"
config_show_config
exit 1
fi
echo "$1: OK! - kmod test case failed as expected"
}
config_expect_result()
{
RC=$(config_get_test_result)
RC_NAME=$(errno_val_to_name $RC)
ERRNO_NAME=$2
ERRNO=$(errno_name_to_val $ERRNO_NAME)
if [[ $ERRNO_NAME = "-ERR_ANY" ]]; then
if [[ $RC -ge 0 ]]; then
echo "$1: FAIL, test expects $ERRNO_NAME - got $RC_NAME ($RC)" >&2
config_show_config
exit 1
fi
elif [[ $RC != $ERRNO ]]; then
echo "$1: FAIL, test expects $ERRNO_NAME ($ERRNO) - got $RC_NAME ($RC)" >&2
config_show_config
exit 1
fi
echo "$1: OK! - Return value: $RC ($RC_NAME), expected $ERRNO_NAME"
}
kmod_defaults_driver()
{
config_reset
modprobe -r $DEFAULT_KMOD_DRIVER
config_set_driver $DEFAULT_KMOD_DRIVER
}
kmod_defaults_fs()
{
config_reset
modprobe -r $DEFAULT_KMOD_FS
config_set_fs $DEFAULT_KMOD_FS
config_set_test_case_fs
}
kmod_test_0001_driver()
{
NAME='\000'
kmod_defaults_driver
config_num_threads 1
printf $NAME >"$DIR"/config_test_driver
config_trigger ${FUNCNAME[0]}
config_expect_result ${FUNCNAME[0]} MODULE_NOT_FOUND
}
kmod_test_0001_fs()
{
NAME='\000'
kmod_defaults_fs
config_num_threads 1
printf $NAME >"$DIR"/config_test_fs
config_trigger ${FUNCNAME[0]}
config_expect_result ${FUNCNAME[0]} -EINVAL
}
kmod_test_0001()
{
kmod_test_0001_driver
kmod_test_0001_fs
}
kmod_test_0002_driver()
{
NAME="nope-$DEFAULT_KMOD_DRIVER"
kmod_defaults_driver
config_set_driver $NAME
config_num_threads 1
config_trigger ${FUNCNAME[0]}
config_expect_result ${FUNCNAME[0]} MODULE_NOT_FOUND
}
kmod_test_0002_fs()
{
NAME="nope-$DEFAULT_KMOD_FS"
kmod_defaults_fs
config_set_fs $NAME
config_trigger ${FUNCNAME[0]}
config_expect_result ${FUNCNAME[0]} -EINVAL
}
kmod_test_0002()
{
kmod_test_0002_driver
kmod_test_0002_fs
}
kmod_test_0003()
{
kmod_defaults_fs
config_num_threads 1
config_trigger ${FUNCNAME[0]}
config_expect_result ${FUNCNAME[0]} SUCCESS
}
kmod_test_0004()
{
kmod_defaults_fs
config_num_threads 2
config_trigger ${FUNCNAME[0]}
config_expect_result ${FUNCNAME[0]} SUCCESS
}
kmod_test_0005()
{
kmod_defaults_driver
config_trigger ${FUNCNAME[0]}
config_expect_result ${FUNCNAME[0]} SUCCESS
}
kmod_test_0006()
{
kmod_defaults_fs
config_trigger ${FUNCNAME[0]}
config_expect_result ${FUNCNAME[0]} SUCCESS
}
kmod_test_0007()
{
kmod_test_0005
kmod_test_0006
}
kmod_test_0008()
{
kmod_defaults_driver
MODPROBE_LIMIT=$(config_get_modprobe_limit)
let EXTRA=$MODPROBE_LIMIT/6
config_num_thread_limit_extra $EXTRA
config_trigger ${FUNCNAME[0]}
config_expect_result ${FUNCNAME[0]} SUCCESS
}
kmod_test_0009()
{
kmod_defaults_fs
MODPROBE_LIMIT=$(config_get_modprobe_limit)
let EXTRA=$MODPROBE_LIMIT/4
config_num_thread_limit_extra $EXTRA
config_trigger ${FUNCNAME[0]}
config_expect_result ${FUNCNAME[0]} SUCCESS
}
kmod_test_0010()
{
kmod_defaults_driver
config_num_threads 1
echo "/KMOD_TEST_NONEXISTENT" > /proc/sys/kernel/modprobe
config_trigger ${FUNCNAME[0]}
config_expect_result ${FUNCNAME[0]} -ENOENT
echo "$MODPROBE" > /proc/sys/kernel/modprobe
}
kmod_test_0011()
{
kmod_defaults_driver
config_num_threads 1
# This causes the kernel to not even try executing modprobe. The error
# code is still -ENOENT like when modprobe doesn't exist, so we can't
# easily test for the exact difference. But this still is a useful test
# since there was a bug where request_module() returned 0 in this case.
echo > /proc/sys/kernel/modprobe
config_trigger ${FUNCNAME[0]}
config_expect_result ${FUNCNAME[0]} -ENOENT
echo "$MODPROBE" > /proc/sys/kernel/modprobe
}
kmod_check_visibility()
{
local name="$1"
local cmd="$2"
modprobe $DEFAULT_KMOD_DRIVER
local priv=$(eval $cmd)
local unpriv=$(capsh --drop=CAP_SYSLOG -- -c "$cmd")
if [ "$priv" = "$unpriv" ] || \
[ "${priv:0:3}" = "0x0" ] || \
[ "${unpriv:0:3}" != "0x0" ] ; then
echo "${FUNCNAME[0]}: FAIL, $name visible to unpriv: '$priv' vs '$unpriv'" >&2
exit 1
else
echo "${FUNCNAME[0]}: OK!"
fi
}
kmod_test_0012()
{
kmod_check_visibility /proc/modules \
"grep '^${DEFAULT_KMOD_DRIVER}\b' /proc/modules | awk '{print \$NF}'"
}
kmod_test_0013()
{
kmod_check_visibility '/sys/module/*/sections/*' \
"cat /sys/module/${DEFAULT_KMOD_DRIVER}/sections/.*text | head -n1"
}
list_tests()
{
echo "Test ID list:"
echo
echo "TEST_ID x NUM_TEST"
echo "TEST_ID: Test ID"
echo "NUM_TESTS: Number of recommended times to run the test"
echo
echo "0001 x $(get_test_count 0001) - Simple test - 1 thread for empty string"
echo "0002 x $(get_test_count 0002) - Simple test - 1 thread for modules/filesystems that do not exist"
echo "0003 x $(get_test_count 0003) - Simple test - 1 thread for get_fs_type() only"
echo "0004 x $(get_test_count 0004) - Simple test - 2 threads for get_fs_type() only"
echo "0005 x $(get_test_count 0005) - multithreaded tests with default setup - request_module() only"
echo "0006 x $(get_test_count 0006) - multithreaded tests with default setup - get_fs_type() only"
echo "0007 x $(get_test_count 0007) - multithreaded tests with default setup test request_module() and get_fs_type()"
echo "0008 x $(get_test_count 0008) - multithreaded - push kmod_concurrent over max_modprobes for request_module()"
echo "0009 x $(get_test_count 0009) - multithreaded - push kmod_concurrent over max_modprobes for get_fs_type()"
echo "0010 x $(get_test_count 0010) - test nonexistent modprobe path"
echo "0011 x $(get_test_count 0011) - test completely disabling module autoloading"
echo "0012 x $(get_test_count 0012) - test /proc/modules address visibility under CAP_SYSLOG"
echo "0013 x $(get_test_count 0013) - test /sys/module/*/sections/* visibility under CAP_SYSLOG"
}
usage()
{
NUM_TESTS=$(grep -o ' ' <<<"$ALL_TESTS" | grep -c .)
let NUM_TESTS=$NUM_TESTS+1
MAX_TEST=$(printf "%04d\n" $NUM_TESTS)
echo "Usage: $0 [ -t <4-number-digit> ] | [ -w <4-number-digit> ] |"
echo " [ -s <4-number-digit> ] | [ -c <4-number-digit> <test- count>"
echo " [ all ] [ -h | --help ] [ -l ]"
echo ""
echo "Valid tests: 0001-$MAX_TEST"
echo ""
echo " all Runs all tests (default)"
echo " -t Run test ID the number amount of times is recommended"
echo " -w Watch test ID run until it runs into an error"
echo " -s Run test ID once"
echo " -c Run test ID x test-count number of times"
echo " -l List all test ID list"
echo " -h|--help Help"
echo
echo "If an error every occurs execution will immediately terminate."
echo "If you are adding a new test try using -w <test-ID> first to"
echo "make sure the test passes a series of tests."
echo
echo Example uses:
echo
echo "${TEST_NAME}.sh -- executes all tests"
echo "${TEST_NAME}.sh -t 0008 -- Executes test ID 0008 number of times is recommended"
echo "${TEST_NAME}.sh -w 0008 -- Watch test ID 0008 run until an error occurs"
echo "${TEST_NAME}.sh -s 0008 -- Run test ID 0008 once"
echo "${TEST_NAME}.sh -c 0008 3 -- Run test ID 0008 three times"
echo
list_tests
exit 1
}
function test_num()
{
re='^[0-9]+$'
if ! [[ $1 =~ $re ]]; then
usage
fi
}
function get_test_data()
{
test_num $1
local field_num=$(echo $1 | sed 's/^0*//')
echo $ALL_TESTS | awk '{print $'$field_num'}'
}
function get_test_count()
{
TEST_DATA=$(get_test_data $1)
LAST_TWO=${TEST_DATA#*:*}
echo ${LAST_TWO%:*}
}
function get_test_enabled()
{
TEST_DATA=$(get_test_data $1)
echo ${TEST_DATA#*:*:}
}
function run_all_tests()
{
for i in $ALL_TESTS ; do
TEST_ID=${i%:*:*}
ENABLED=$(get_test_enabled $TEST_ID)
TEST_COUNT=$(get_test_count $TEST_ID)
if [[ $ENABLED -eq "1" ]]; then
test_case $TEST_ID $TEST_COUNT
fi
done
}
function watch_log()
{
if [ $# -ne 3 ]; then
clear
fi
date
echo "Running test: $2 - run #$1"
}
function watch_case()
{
i=0
while [ 1 ]; do
if [ $# -eq 1 ]; then
test_num $1
watch_log $i ${TEST_NAME}_test_$1
${TEST_NAME}_test_$1
else
watch_log $i all
run_all_tests
fi
let i=$i+1
done
}
function test_case()
{
NUM_TESTS=$DEFAULT_NUM_TESTS
if [ $# -eq 2 ]; then
NUM_TESTS=$2
fi
i=0
while [ $i -lt $NUM_TESTS ]; do
test_num $1
watch_log $i ${TEST_NAME}_test_$1 noclear
RUN_TEST=${TEST_NAME}_test_$1
$RUN_TEST
let i=$i+1
done
}
function parse_args()
{
if [ $# -eq 0 ]; then
run_all_tests
else
if [[ "$1" = "all" ]]; then
run_all_tests
elif [[ "$1" = "-w" ]]; then
shift
watch_case $@
elif [[ "$1" = "-t" ]]; then
shift
test_num $1
test_case $1 $(get_test_count $1)
elif [[ "$1" = "-c" ]]; then
shift
test_num $1
test_num $2
test_case $1 $2
elif [[ "$1" = "-s" ]]; then
shift
test_case $1 1
elif [[ "$1" = "-l" ]]; then
list_tests
elif [[ "$1" = "-h" || "$1" = "--help" ]]; then
usage
else
usage
fi
fi
}
test_reqs
allow_user_defaults
load_req_mod
MODPROBE=$(</proc/sys/kernel/modprobe)
trap "test_finish" EXIT
parse_args $@
exit 0