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689 lines
16 KiB
689 lines
16 KiB
#!/bin/bash |
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# |
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# Copyright (C) 2017 Luis R. Rodriguez <[email protected]> |
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# |
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# This program is free software; you can redistribute it and/or modify it |
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# under the terms of the GNU General Public License as published by the Free |
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# Software Foundation; either version 2 of the License, or at your option any |
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# later version; or, when distributed separately from the Linux kernel or |
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# when incorporated into other software packages, subject to the following |
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# license: |
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# |
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# This program is free software; you can redistribute it and/or modify it |
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# under the terms of copyleft-next (version 0.3.1 or later) as published |
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# at http://copyleft-next.org/. |
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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" |
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echo " -l List all test ID list" |
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echo " -h|--help Help" |
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echo |
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echo "If an error every occurs execution will immediately terminate." |
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echo "If you are adding a new test try using -w <test-ID> first to" |
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echo "make sure the test passes a series of tests." |
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echo |
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echo Example uses: |
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echo |
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echo "${TEST_NAME}.sh -- executes all tests" |
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echo "${TEST_NAME}.sh -t 0008 -- Executes test ID 0008 number of times is recommended" |
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echo "${TEST_NAME}.sh -w 0008 -- Watch test ID 0008 run until an error occurs" |
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echo "${TEST_NAME}.sh -s 0008 -- Run test ID 0008 once" |
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echo "${TEST_NAME}.sh -c 0008 3 -- Run test ID 0008 three times" |
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echo |
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list_tests |
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exit 1 |
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} |
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function test_num() |
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{ |
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re='^[0-9]+$' |
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if ! [[ $1 =~ $re ]]; then |
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usage |
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fi |
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} |
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function get_test_data() |
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{ |
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test_num $1 |
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local field_num=$(echo $1 | sed 's/^0*//') |
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echo $ALL_TESTS | awk '{print $'$field_num'}' |
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} |
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function get_test_count() |
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{ |
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TEST_DATA=$(get_test_data $1) |
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LAST_TWO=${TEST_DATA#*:*} |
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echo ${LAST_TWO%:*} |
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} |
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function get_test_enabled() |
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{ |
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TEST_DATA=$(get_test_data $1) |
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echo ${TEST_DATA#*:*:} |
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} |
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function run_all_tests() |
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{ |
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for i in $ALL_TESTS ; do |
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TEST_ID=${i%:*:*} |
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ENABLED=$(get_test_enabled $TEST_ID) |
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TEST_COUNT=$(get_test_count $TEST_ID) |
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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
|
|
|