113 lines · bash
1#!/bin/sh2# SPDX-License-Identifier: GPL-2.03#4# This reads tests.txt for the list of LKDTM tests to invoke. Any marked5# with a leading "#" are skipped. The rest of the line after the6# test name is either the text to look for in dmesg for a "success",7# or the rationale for why a test is marked to be skipped.8#9set -e10TRIGGER=/sys/kernel/debug/provoke-crash/DIRECT11CLEAR_ONCE=/sys/kernel/debug/clear_warn_once12KSELFTEST_SKIP_TEST=413 14# Verify we have LKDTM available in the kernel.15if [ ! -r $TRIGGER ] ; then16 /sbin/modprobe -q lkdtm || true17 if [ ! -r $TRIGGER ] ; then18 echo "Cannot find $TRIGGER (missing CONFIG_LKDTM?)"19 else20 echo "Cannot write $TRIGGER (need to run as root?)"21 fi22 # Skip this test23 exit $KSELFTEST_SKIP_TEST24fi25 26# Figure out which test to run from our script name.27test=$(basename $0 .sh)28# Look up details about the test from master list of LKDTM tests.29line=$(grep -E '^#?'"$test"'\b' tests.txt)30if [ -z "$line" ]; then31 echo "Skipped: missing test '$test' in tests.txt"32 exit $KSELFTEST_SKIP_TEST33fi34# Check that the test is known to LKDTM.35if ! grep -E -q '^'"$test"'$' "$TRIGGER" ; then36 echo "Skipped: test '$test' missing in $TRIGGER!"37 exit $KSELFTEST_SKIP_TEST38fi39 40# Extract notes/expected output from test list.41test=$(echo "$line" | cut -d" " -f1)42if echo "$line" | grep -q ' ' ; then43 expect=$(echo "$line" | cut -d" " -f2-)44else45 expect=""46fi47 48# If the test is commented out, report a skip49if echo "$test" | grep -q '^#' ; then50 test=$(echo "$test" | cut -c2-)51 if [ -z "$expect" ]; then52 expect="crashes entire system"53 fi54 echo "Skipping $test: $expect"55 exit $KSELFTEST_SKIP_TEST56fi57 58# If no expected output given, assume an Oops with back trace is success.59repeat=160if [ -z "$expect" ]; then61 expect="call trace:"62else63 if echo "$expect" | grep -q '^repeat:' ; then64 repeat=$(echo "$expect" | cut -d' ' -f1 | cut -d: -f2)65 expect=$(echo "$expect" | cut -d' ' -f2-)66 fi67fi68 69# Prepare log for report checking70LOG=$(mktemp --tmpdir -t lkdtm-log-XXXXXX)71DMESG=$(mktemp --tmpdir -t lkdtm-dmesg-XXXXXX)72cleanup() {73 rm -f "$LOG" "$DMESG"74}75trap cleanup EXIT76 77# Reset WARN_ONCE counters so we trip it each time this runs.78if [ -w $CLEAR_ONCE ] ; then79 echo 1 > $CLEAR_ONCE80fi81 82# Save existing dmesg so we can detect new content below83dmesg > "$DMESG"84 85# Since the kernel is likely killing the process writing to the trigger86# file, it must not be the script's shell itself. i.e. we cannot do:87# echo "$test" >"$TRIGGER"88# Instead, use "cat" to take the signal. Since the shell will yell about89# the signal that killed the subprocess, we must ignore the failure and90# continue. However we don't silence stderr since there might be other91# useful details reported there in the case of other unexpected conditions.92for i in $(seq 1 $repeat); do93 echo "$test" | cat >"$TRIGGER" || true94done95 96# Record and dump the results97dmesg | comm --nocheck-order -13 "$DMESG" - > "$LOG" || true98 99cat "$LOG"100# Check for expected output101if grep -E -qi "$expect" "$LOG" ; then102 echo "$test: saw '$expect': ok"103 exit 0104else105 if grep -E -qi XFAIL: "$LOG" ; then106 echo "$test: saw 'XFAIL': [SKIP]"107 exit $KSELFTEST_SKIP_TEST108 else109 echo "$test: missing '$expect': [FAIL]"110 exit 1111 fi112fi113