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