1#!/bin/bash 2# Copyright (C) 2017 Luis R. Rodriguez <mcgrof@kernel.org> 3# 4# This program is free software; you can redistribute it and/or modify it 5# under the terms of the GNU General Public License as published by the Free 6# Software Foundation; either version 2 of the License, or at your option any 7# later version; or, when distributed separately from the Linux kernel or 8# when incorporated into other software packages, subject to the following 9# license: 10# 11# This program is free software; you can redistribute it and/or modify it 12# under the terms of copyleft-next (version 0.3.1 or later) as published 13# at http://copyleft-next.org/. 14 15# This performs a series tests against the proc sysctl interface. 16 17# Kselftest framework requirement - SKIP code is 4. 18ksft_skip=4 19 20TEST_NAME="sysctl" 21TEST_DRIVER="test_${TEST_NAME}" 22TEST_DIR=$(dirname $0) 23TEST_FILE=$(mktemp) 24 25# This represents 26# 27# TEST_ID:TEST_COUNT:ENABLED 28# 29# TEST_ID: is the test id number 30# TEST_COUNT: number of times we should run the test 31# ENABLED: 1 if enabled, 0 otherwise 32# 33# Once these are enabled please leave them as-is. Write your own test, 34# we have tons of space. 35ALL_TESTS="0001:1:1" 36ALL_TESTS="$ALL_TESTS 0002:1:1" 37ALL_TESTS="$ALL_TESTS 0003:1:1" 38ALL_TESTS="$ALL_TESTS 0004:1:1" 39ALL_TESTS="$ALL_TESTS 0005:3:1" 40 41test_modprobe() 42{ 43 if [ ! -d $DIR ]; then 44 echo "$0: $DIR not present" >&2 45 echo "You must have the following enabled in your kernel:" >&2 46 cat $TEST_DIR/config >&2 47 exit $ksft_skip 48 fi 49} 50 51function allow_user_defaults() 52{ 53 if [ -z $DIR ]; then 54 DIR="/sys/module/test_sysctl/" 55 fi 56 if [ -z $DEFAULT_NUM_TESTS ]; then 57 DEFAULT_NUM_TESTS=50 58 fi 59 if [ -z $SYSCTL ]; then 60 SYSCTL="/proc/sys/debug/test_sysctl" 61 fi 62 if [ -z $PROD_SYSCTL ]; then 63 PROD_SYSCTL="/proc/sys" 64 fi 65 if [ -z $WRITES_STRICT ]; then 66 WRITES_STRICT="${PROD_SYSCTL}/kernel/sysctl_writes_strict" 67 fi 68} 69 70function check_production_sysctl_writes_strict() 71{ 72 echo -n "Checking production write strict setting ... " 73 if [ ! -e ${WRITES_STRICT} ]; then 74 echo "FAIL, but skip in case of old kernel" >&2 75 else 76 old_strict=$(cat ${WRITES_STRICT}) 77 if [ "$old_strict" = "1" ]; then 78 echo "ok" 79 else 80 echo "FAIL, strict value is 0 but force to 1 to continue" >&2 81 echo "1" > ${WRITES_STRICT} 82 fi 83 fi 84 85 if [ -z $PAGE_SIZE ]; then 86 PAGE_SIZE=$(getconf PAGESIZE) 87 fi 88 if [ -z $MAX_DIGITS ]; then 89 MAX_DIGITS=$(($PAGE_SIZE/8)) 90 fi 91 if [ -z $INT_MAX ]; then 92 INT_MAX=$(getconf INT_MAX) 93 fi 94 if [ -z $UINT_MAX ]; then 95 UINT_MAX=$(getconf UINT_MAX) 96 fi 97} 98 99test_reqs() 100{ 101 uid=$(id -u) 102 if [ $uid -ne 0 ]; then 103 echo $msg must be run as root >&2 104 exit $ksft_skip 105 fi 106 107 if ! which perl 2> /dev/null > /dev/null; then 108 echo "$0: You need perl installed" 109 exit $ksft_skip 110 fi 111 if ! which getconf 2> /dev/null > /dev/null; then 112 echo "$0: You need getconf installed" 113 exit $ksft_skip 114 fi 115 if ! which diff 2> /dev/null > /dev/null; then 116 echo "$0: You need diff installed" 117 exit $ksft_skip 118 fi 119} 120 121function load_req_mod() 122{ 123 if [ ! -d $DIR ]; then 124 if ! modprobe -q -n $TEST_DRIVER; then 125 echo "$0: module $TEST_DRIVER not found [SKIP]" 126 exit $ksft_skip 127 fi 128 modprobe $TEST_DRIVER 129 if [ $? -ne 0 ]; then 130 exit 131 fi 132 fi 133} 134 135reset_vals() 136{ 137 VAL="" 138 TRIGGER=$(basename ${TARGET}) 139 case "$TRIGGER" in 140 int_0001) 141 VAL="60" 142 ;; 143 int_0002) 144 VAL="1" 145 ;; 146 uint_0001) 147 VAL="314" 148 ;; 149 string_0001) 150 VAL="(none)" 151 ;; 152 *) 153 ;; 154 esac 155 echo -n $VAL > $TARGET 156} 157 158set_orig() 159{ 160 if [ ! -z $TARGET ]; then 161 echo "${ORIG}" > "${TARGET}" 162 fi 163} 164 165set_test() 166{ 167 echo "${TEST_STR}" > "${TARGET}" 168} 169 170verify() 171{ 172 local seen 173 seen=$(cat "$1") 174 if [ "${seen}" != "${TEST_STR}" ]; then 175 return 1 176 fi 177 return 0 178} 179 180verify_diff_w() 181{ 182 echo "$TEST_STR" | diff -q -w -u - $1 183 return $? 184} 185 186test_rc() 187{ 188 if [[ $rc != 0 ]]; then 189 echo "Failed test, return value: $rc" >&2 190 exit $rc 191 fi 192} 193 194test_finish() 195{ 196 set_orig 197 rm -f "${TEST_FILE}" 198 199 if [ ! -z ${old_strict} ]; then 200 echo ${old_strict} > ${WRITES_STRICT} 201 fi 202 exit $rc 203} 204 205run_numerictests() 206{ 207 echo "== Testing sysctl behavior against ${TARGET} ==" 208 209 rc=0 210 211 echo -n "Writing test file ... " 212 echo "${TEST_STR}" > "${TEST_FILE}" 213 if ! verify "${TEST_FILE}"; then 214 echo "FAIL" >&2 215 exit 1 216 else 217 echo "ok" 218 fi 219 220 echo -n "Checking sysctl is not set to test value ... " 221 if verify "${TARGET}"; then 222 echo "FAIL" >&2 223 exit 1 224 else 225 echo "ok" 226 fi 227 228 echo -n "Writing sysctl from shell ... " 229 set_test 230 if ! verify "${TARGET}"; then 231 echo "FAIL" >&2 232 exit 1 233 else 234 echo "ok" 235 fi 236 237 echo -n "Resetting sysctl to original value ... " 238 set_orig 239 if verify "${TARGET}"; then 240 echo "FAIL" >&2 241 exit 1 242 else 243 echo "ok" 244 fi 245 246 # Now that we've validated the sanity of "set_test" and "set_orig", 247 # we can use those functions to set starting states before running 248 # specific behavioral tests. 249 250 echo -n "Writing entire sysctl in single write ... " 251 set_orig 252 dd if="${TEST_FILE}" of="${TARGET}" bs=4096 2>/dev/null 253 if ! verify "${TARGET}"; then 254 echo "FAIL" >&2 255 rc=1 256 else 257 echo "ok" 258 fi 259 260 echo -n "Writing middle of sysctl after synchronized seek ... " 261 set_test 262 dd if="${TEST_FILE}" of="${TARGET}" bs=1 seek=1 skip=1 2>/dev/null 263 if ! verify "${TARGET}"; then 264 echo "FAIL" >&2 265 rc=1 266 else 267 echo "ok" 268 fi 269 270 echo -n "Writing beyond end of sysctl ... " 271 set_orig 272 dd if="${TEST_FILE}" of="${TARGET}" bs=20 seek=2 2>/dev/null 273 if verify "${TARGET}"; then 274 echo "FAIL" >&2 275 rc=1 276 else 277 echo "ok" 278 fi 279 280 echo -n "Writing sysctl with multiple long writes ... " 281 set_orig 282 (perl -e 'print "A" x 50;'; echo "${TEST_STR}") | \ 283 dd of="${TARGET}" bs=50 2>/dev/null 284 if verify "${TARGET}"; then 285 echo "FAIL" >&2 286 rc=1 287 else 288 echo "ok" 289 fi 290 test_rc 291} 292 293check_failure() 294{ 295 echo -n "Testing that $1 fails as expected..." 296 reset_vals 297 TEST_STR="$1" 298 orig="$(cat $TARGET)" 299 echo -n "$TEST_STR" > $TARGET 2> /dev/null 300 301 # write should fail and $TARGET should retain its original value 302 if [ $? = 0 ] || [ "$(cat $TARGET)" != "$orig" ]; then 303 echo "FAIL" >&2 304 rc=1 305 else 306 echo "ok" 307 fi 308 test_rc 309} 310 311run_wideint_tests() 312{ 313 # sysctl conversion functions receive a boolean sign and ulong 314 # magnitude; here we list the magnitudes we want to test (each of 315 # which will be tested in both positive and negative forms). Since 316 # none of these values fit in 32 bits, writing them to an int- or 317 # uint-typed sysctl should fail. 318 local magnitudes=( 319 # common boundary-condition values (zero, +1, -1, INT_MIN, 320 # and INT_MAX respectively) if truncated to lower 32 bits 321 # (potential for being falsely deemed in range) 322 0x0000000100000000 323 0x0000000100000001 324 0x00000001ffffffff 325 0x0000000180000000 326 0x000000017fffffff 327 328 # these look like negatives, but without a leading '-' are 329 # actually large positives (should be rejected as above 330 # despite being zero/+1/-1/INT_MIN/INT_MAX in the lower 32) 331 0xffffffff00000000 332 0xffffffff00000001 333 0xffffffffffffffff 334 0xffffffff80000000 335 0xffffffff7fffffff 336 ) 337 338 for sign in '' '-'; do 339 for mag in "${magnitudes[@]}"; do 340 check_failure "${sign}${mag}" 341 done 342 done 343} 344 345# Your test must accept digits 3 and 4 to use this 346run_limit_digit() 347{ 348 echo -n "Checking ignoring spaces up to PAGE_SIZE works on write ..." 349 reset_vals 350 351 LIMIT=$((MAX_DIGITS -1)) 352 TEST_STR="3" 353 (perl -e 'print " " x '$LIMIT';'; echo "${TEST_STR}") | \ 354 dd of="${TARGET}" 2>/dev/null 355 356 if ! verify "${TARGET}"; then 357 echo "FAIL" >&2 358 rc=1 359 else 360 echo "ok" 361 fi 362 test_rc 363 364 echo -n "Checking passing PAGE_SIZE of spaces fails on write ..." 365 reset_vals 366 367 LIMIT=$((MAX_DIGITS)) 368 TEST_STR="4" 369 (perl -e 'print " " x '$LIMIT';'; echo "${TEST_STR}") | \ 370 dd of="${TARGET}" 2>/dev/null 371 372 if verify "${TARGET}"; then 373 echo "FAIL" >&2 374 rc=1 375 else 376 echo "ok" 377 fi 378 test_rc 379} 380 381# You are using an int 382run_limit_digit_int() 383{ 384 echo -n "Testing INT_MAX works ..." 385 reset_vals 386 TEST_STR="$INT_MAX" 387 echo -n $TEST_STR > $TARGET 388 389 if ! verify "${TARGET}"; then 390 echo "FAIL" >&2 391 rc=1 392 else 393 echo "ok" 394 fi 395 test_rc 396 397 echo -n "Testing INT_MAX + 1 will fail as expected..." 398 reset_vals 399 let TEST_STR=$INT_MAX+1 400 echo -n $TEST_STR > $TARGET 2> /dev/null 401 402 if verify "${TARGET}"; then 403 echo "FAIL" >&2 404 rc=1 405 else 406 echo "ok" 407 fi 408 test_rc 409 410 echo -n "Testing negative values will work as expected..." 411 reset_vals 412 TEST_STR="-3" 413 echo -n $TEST_STR > $TARGET 2> /dev/null 414 if ! verify "${TARGET}"; then 415 echo "FAIL" >&2 416 rc=1 417 else 418 echo "ok" 419 fi 420 test_rc 421} 422 423# You used an int array 424run_limit_digit_int_array() 425{ 426 echo -n "Testing array works as expected ... " 427 TEST_STR="4 3 2 1" 428 echo -n $TEST_STR > $TARGET 429 430 if ! verify_diff_w "${TARGET}"; then 431 echo "FAIL" >&2 432 rc=1 433 else 434 echo "ok" 435 fi 436 test_rc 437 438 echo -n "Testing skipping trailing array elements works ... " 439 # Do not reset_vals, carry on the values from the last test. 440 # If we only echo in two digits the last two are left intact 441 TEST_STR="100 101" 442 echo -n $TEST_STR > $TARGET 443 # After we echo in, to help diff we need to set on TEST_STR what 444 # we expect the result to be. 445 TEST_STR="100 101 2 1" 446 447 if ! verify_diff_w "${TARGET}"; then 448 echo "FAIL" >&2 449 rc=1 450 else 451 echo "ok" 452 fi 453 test_rc 454 455 echo -n "Testing PAGE_SIZE limit on array works ... " 456 # Do not reset_vals, carry on the values from the last test. 457 # Even if you use an int array, you are still restricted to 458 # MAX_DIGITS, this is a known limitation. Test limit works. 459 LIMIT=$((MAX_DIGITS -1)) 460 TEST_STR="9" 461 (perl -e 'print " " x '$LIMIT';'; echo "${TEST_STR}") | \ 462 dd of="${TARGET}" 2>/dev/null 463 464 TEST_STR="9 101 2 1" 465 if ! verify_diff_w "${TARGET}"; then 466 echo "FAIL" >&2 467 rc=1 468 else 469 echo "ok" 470 fi 471 test_rc 472 473 echo -n "Testing exceeding PAGE_SIZE limit fails as expected ... " 474 # Do not reset_vals, carry on the values from the last test. 475 # Now go over limit. 476 LIMIT=$((MAX_DIGITS)) 477 TEST_STR="7" 478 (perl -e 'print " " x '$LIMIT';'; echo "${TEST_STR}") | \ 479 dd of="${TARGET}" 2>/dev/null 480 481 TEST_STR="7 101 2 1" 482 if verify_diff_w "${TARGET}"; then 483 echo "FAIL" >&2 484 rc=1 485 else 486 echo "ok" 487 fi 488 test_rc 489} 490 491# You are using an unsigned int 492run_limit_digit_uint() 493{ 494 echo -n "Testing UINT_MAX works ..." 495 reset_vals 496 TEST_STR="$UINT_MAX" 497 echo -n $TEST_STR > $TARGET 498 499 if ! verify "${TARGET}"; then 500 echo "FAIL" >&2 501 rc=1 502 else 503 echo "ok" 504 fi 505 test_rc 506 507 echo -n "Testing UINT_MAX + 1 will fail as expected..." 508 reset_vals 509 TEST_STR=$(($UINT_MAX+1)) 510 echo -n $TEST_STR > $TARGET 2> /dev/null 511 512 if verify "${TARGET}"; then 513 echo "FAIL" >&2 514 rc=1 515 else 516 echo "ok" 517 fi 518 test_rc 519 520 echo -n "Testing negative values will not work as expected ..." 521 reset_vals 522 TEST_STR="-3" 523 echo -n $TEST_STR > $TARGET 2> /dev/null 524 525 if verify "${TARGET}"; then 526 echo "FAIL" >&2 527 rc=1 528 else 529 echo "ok" 530 fi 531 test_rc 532} 533 534run_stringtests() 535{ 536 echo -n "Writing entire sysctl in short writes ... " 537 set_orig 538 dd if="${TEST_FILE}" of="${TARGET}" bs=1 2>/dev/null 539 if ! verify "${TARGET}"; then 540 echo "FAIL" >&2 541 rc=1 542 else 543 echo "ok" 544 fi 545 546 echo -n "Writing middle of sysctl after unsynchronized seek ... " 547 set_test 548 dd if="${TEST_FILE}" of="${TARGET}" bs=1 seek=1 2>/dev/null 549 if verify "${TARGET}"; then 550 echo "FAIL" >&2 551 rc=1 552 else 553 echo "ok" 554 fi 555 556 echo -n "Checking sysctl maxlen is at least $MAXLEN ... " 557 set_orig 558 perl -e 'print "A" x ('"${MAXLEN}"'-2), "B";' | \ 559 dd of="${TARGET}" bs="${MAXLEN}" 2>/dev/null 560 if ! grep -q B "${TARGET}"; then 561 echo "FAIL" >&2 562 rc=1 563 else 564 echo "ok" 565 fi 566 567 echo -n "Checking sysctl keeps original string on overflow append ... " 568 set_orig 569 perl -e 'print "A" x ('"${MAXLEN}"'-1), "B";' | \ 570 dd of="${TARGET}" bs=$(( MAXLEN - 1 )) 2>/dev/null 571 if grep -q B "${TARGET}"; then 572 echo "FAIL" >&2 573 rc=1 574 else 575 echo "ok" 576 fi 577 578 echo -n "Checking sysctl stays NULL terminated on write ... " 579 set_orig 580 perl -e 'print "A" x ('"${MAXLEN}"'-1), "B";' | \ 581 dd of="${TARGET}" bs="${MAXLEN}" 2>/dev/null 582 if grep -q B "${TARGET}"; then 583 echo "FAIL" >&2 584 rc=1 585 else 586 echo "ok" 587 fi 588 589 echo -n "Checking sysctl stays NULL terminated on overwrite ... " 590 set_orig 591 perl -e 'print "A" x ('"${MAXLEN}"'-1), "BB";' | \ 592 dd of="${TARGET}" bs=$(( $MAXLEN + 1 )) 2>/dev/null 593 if grep -q B "${TARGET}"; then 594 echo "FAIL" >&2 595 rc=1 596 else 597 echo "ok" 598 fi 599 600 test_rc 601} 602 603sysctl_test_0001() 604{ 605 TARGET="${SYSCTL}/int_0001" 606 reset_vals 607 ORIG=$(cat "${TARGET}") 608 TEST_STR=$(( $ORIG + 1 )) 609 610 run_numerictests 611 run_wideint_tests 612 run_limit_digit 613} 614 615sysctl_test_0002() 616{ 617 TARGET="${SYSCTL}/string_0001" 618 reset_vals 619 ORIG=$(cat "${TARGET}") 620 TEST_STR="Testing sysctl" 621 # Only string sysctls support seeking/appending. 622 MAXLEN=65 623 624 run_numerictests 625 run_stringtests 626} 627 628sysctl_test_0003() 629{ 630 TARGET="${SYSCTL}/int_0002" 631 reset_vals 632 ORIG=$(cat "${TARGET}") 633 TEST_STR=$(( $ORIG + 1 )) 634 635 run_numerictests 636 run_wideint_tests 637 run_limit_digit 638 run_limit_digit_int 639} 640 641sysctl_test_0004() 642{ 643 TARGET="${SYSCTL}/uint_0001" 644 reset_vals 645 ORIG=$(cat "${TARGET}") 646 TEST_STR=$(( $ORIG + 1 )) 647 648 run_numerictests 649 run_wideint_tests 650 run_limit_digit 651 run_limit_digit_uint 652} 653 654sysctl_test_0005() 655{ 656 TARGET="${SYSCTL}/int_0003" 657 reset_vals 658 ORIG=$(cat "${TARGET}") 659 660 run_limit_digit_int_array 661} 662 663list_tests() 664{ 665 echo "Test ID list:" 666 echo 667 echo "TEST_ID x NUM_TEST" 668 echo "TEST_ID: Test ID" 669 echo "NUM_TESTS: Number of recommended times to run the test" 670 echo 671 echo "0001 x $(get_test_count 0001) - tests proc_dointvec_minmax()" 672 echo "0002 x $(get_test_count 0002) - tests proc_dostring()" 673 echo "0003 x $(get_test_count 0003) - tests proc_dointvec()" 674 echo "0004 x $(get_test_count 0004) - tests proc_douintvec()" 675 echo "0005 x $(get_test_count 0005) - tests proc_douintvec() array" 676} 677 678usage() 679{ 680 NUM_TESTS=$(grep -o ' ' <<<"$ALL_TESTS" | grep -c .) 681 let NUM_TESTS=$NUM_TESTS+1 682 MAX_TEST=$(printf "%04d\n" $NUM_TESTS) 683 echo "Usage: $0 [ -t <4-number-digit> ] | [ -w <4-number-digit> ] |" 684 echo " [ -s <4-number-digit> ] | [ -c <4-number-digit> <test- count>" 685 echo " [ all ] [ -h | --help ] [ -l ]" 686 echo "" 687 echo "Valid tests: 0001-$MAX_TEST" 688 echo "" 689 echo " all Runs all tests (default)" 690 echo " -t Run test ID the number amount of times is recommended" 691 echo " -w Watch test ID run until it runs into an error" 692 echo " -c Run test ID once" 693 echo " -s Run test ID x test-count number of times" 694 echo " -l List all test ID list" 695 echo " -h|--help Help" 696 echo 697 echo "If an error every occurs execution will immediately terminate." 698 echo "If you are adding a new test try using -w <test-ID> first to" 699 echo "make sure the test passes a series of tests." 700 echo 701 echo Example uses: 702 echo 703 echo "$TEST_NAME.sh -- executes all tests" 704 echo "$TEST_NAME.sh -t 0002 -- Executes test ID 0002 number of times is recomended" 705 echo "$TEST_NAME.sh -w 0002 -- Watch test ID 0002 run until an error occurs" 706 echo "$TEST_NAME.sh -s 0002 -- Run test ID 0002 once" 707 echo "$TEST_NAME.sh -c 0002 3 -- Run test ID 0002 three times" 708 echo 709 list_tests 710 exit 1 711} 712 713function test_num() 714{ 715 re='^[0-9]+$' 716 if ! [[ $1 =~ $re ]]; then 717 usage 718 fi 719} 720 721function get_test_count() 722{ 723 test_num $1 724 TEST_DATA=$(echo $ALL_TESTS | awk '{print $'$1'}') 725 LAST_TWO=${TEST_DATA#*:*} 726 echo ${LAST_TWO%:*} 727} 728 729function get_test_enabled() 730{ 731 test_num $1 732 TEST_DATA=$(echo $ALL_TESTS | awk '{print $'$1'}') 733 echo ${TEST_DATA#*:*:} 734} 735 736function run_all_tests() 737{ 738 for i in $ALL_TESTS ; do 739 TEST_ID=${i%:*:*} 740 ENABLED=$(get_test_enabled $TEST_ID) 741 TEST_COUNT=$(get_test_count $TEST_ID) 742 if [[ $ENABLED -eq "1" ]]; then 743 test_case $TEST_ID $TEST_COUNT 744 fi 745 done 746} 747 748function watch_log() 749{ 750 if [ $# -ne 3 ]; then 751 clear 752 fi 753 date 754 echo "Running test: $2 - run #$1" 755} 756 757function watch_case() 758{ 759 i=0 760 while [ 1 ]; do 761 762 if [ $# -eq 1 ]; then 763 test_num $1 764 watch_log $i ${TEST_NAME}_test_$1 765 ${TEST_NAME}_test_$1 766 else 767 watch_log $i all 768 run_all_tests 769 fi 770 let i=$i+1 771 done 772} 773 774function test_case() 775{ 776 NUM_TESTS=$DEFAULT_NUM_TESTS 777 if [ $# -eq 2 ]; then 778 NUM_TESTS=$2 779 fi 780 781 i=0 782 while [ $i -lt $NUM_TESTS ]; do 783 test_num $1 784 watch_log $i ${TEST_NAME}_test_$1 noclear 785 RUN_TEST=${TEST_NAME}_test_$1 786 $RUN_TEST 787 let i=$i+1 788 done 789} 790 791function parse_args() 792{ 793 if [ $# -eq 0 ]; then 794 run_all_tests 795 else 796 if [[ "$1" = "all" ]]; then 797 run_all_tests 798 elif [[ "$1" = "-w" ]]; then 799 shift 800 watch_case $@ 801 elif [[ "$1" = "-t" ]]; then 802 shift 803 test_num $1 804 test_case $1 $(get_test_count $1) 805 elif [[ "$1" = "-c" ]]; then 806 shift 807 test_num $1 808 test_num $2 809 test_case $1 $2 810 elif [[ "$1" = "-s" ]]; then 811 shift 812 test_case $1 1 813 elif [[ "$1" = "-l" ]]; then 814 list_tests 815 elif [[ "$1" = "-h" || "$1" = "--help" ]]; then 816 usage 817 else 818 usage 819 fi 820 fi 821} 822 823test_reqs 824allow_user_defaults 825check_production_sysctl_writes_strict 826load_req_mod 827test_modprobe 828 829trap "test_finish" EXIT 830 831parse_args $@ 832 833exit 0 834