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#!/bin/bash
#
# Copyright (C) 2017 Luis R. Rodriguez <mcgrof@kernel.org>
#
# This program is free software; you can redistribute it and/or modify it
# under the terms of the GNU General Public License as published by the Free
# Software Foundation; either version 2 of the License, or at your option any
# later version; or, when distributed separately from the Linux kernel or
# when incorporated into other software packages, subject to the following
# license:
#
# This program is free software; you can redistribute it and/or modify it
# under the terms of copyleft-next (version 0.3.1 or later) as published
# at http://copyleft-next.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 filesyste 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"
# 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 "http://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 "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 "$0: reset shuld have worked" >&2
exit 1
fi
}
config_show_config()
{
echo "----------------------------------------------------"
cat "$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 $DEFAULT_KMOD_FS
config_set_test_case_fs
}
kmod_test_0001_driver()
{
NAME='\000'
kmod_defaults_driver
config_num_threads 1
printf '\000' >"$DIR"/config_test_driver
config_trigger ${FUNCNAME[0]}
config_expect_result ${FUNCNAME[0]} MODULE_NOT_FOUND
}
kmod_test_0001_fs()
{
NAME='\000'
kmod_defaults_fs
config_num_threads 1
printf '\000' >"$DIR"/config_test_fs
config_trigger ${FUNCNAME[0]}
config_expect_result ${FUNCNAME[0]
|