1#!/bin/sh 2# SPDX-License-Identifier: GPL-2.0 3# 4# This reads tests.txt for the list of LKDTM tests to invoke. Any marked 5# with a leading "#" are skipped. The rest of the line after the 6# 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 -e 10TRIGGER=/sys/kernel/debug/provoke-crash/DIRECT 11CLEAR_ONCE=/sys/kernel/debug/clear_warn_once 12KSELFTEST_SKIP_TEST=4 13 14# Verify we have LKDTM available in the kernel. 15if [ ! -r $TRIGGER ] ; then 16 /sbin/modprobe -q lkdtm || true 17 if [ ! -r $TRIGGER ] ; then 18 echo "Cannot find $TRIGGER (missing CONFIG_LKDTM?)" 19 else 20 echo "Cannot write $TRIGGER (need to run as root?)" 21 fi 22 # Skip this test 23 exit $KSELFTEST_SKIP_TEST 24fi 25 26# Figure out which test to run from our script name. 27test=$(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" ]; then 31 echo "Skipped: missing test '$test' in tests.txt" 32 exit $KSELFTEST_SKIP_TEST 33fi 34# Check that the test is known to LKDTM. 35if ! grep -E -q '^'"$test"'$' "$TRIGGER" ; then 36 echo "Skipped: test '$test' missing in $TRIGGER!" 37 exit $KSELFTEST_SKIP_TEST 38fi 39 40# Extract notes/expected output from test list. 41test=$(echo "$line" | cut -d" " -f1) 42if echo "$line" | grep -q ' ' ; then 43 expect=$(echo "$line" | cut -d" " -f2-) 44else 45 expect="" 46fi 47 48# If the test is commented out, report a skip 49if echo "$test" | grep -q '^#' ; then 50 test=$(echo "$test" | cut -c2-) 51 if [ -z "$expect" ]; then 52 expect="crashes entire system" 53 fi 54 echo "Skipping $test: $expect" 55 exit $KSELFTEST_SKIP_TEST 56fi 57 58# If no expected output given, assume an Oops with back trace is success. 59repeat=1 60if [ -z "$expect" ]; then 61 expect="call trace:" 62else 63 if echo "$expect" | grep -q '^repeat:' ; then 64 repeat=$(echo "$expect" | cut -d' ' -f1 | cut -d: -f2) 65 expect=$(echo "$expect" | cut -d' ' -f2-) 66 fi 67fi 68 69# Prepare log for report checking 70LOG=$(mktemp --tmpdir -t lkdtm-log-XXXXXX) 71DMESG=$(mktemp --tmpdir -t lkdtm-dmesg-XXXXXX) 72cleanup() { 73 rm -f "$LOG" "$DMESG" 74} 75trap cleanup EXIT 76 77# Reset WARN_ONCE counters so we trip it each time this runs. 78if [ -w $CLEAR_ONCE ] ; then 79 echo 1 > $CLEAR_ONCE 80fi 81 82# Save existing dmesg so we can detect new content below 83dmesg > "$DMESG" 84 85# Since the kernel is likely killing the process writing to the trigger 86# 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 about 89# the signal that killed the subprocess, we must ignore the failure and 90# continue. However we don't silence stderr since there might be other 91# useful details reported there in the case of other unexpected conditions. 92for i in $(seq 1 $repeat); do 93 echo "$test" | cat >"$TRIGGER" || true 94done 95 96# Record and dump the results 97dmesg | comm --nocheck-order -13 "$DMESG" - > "$LOG" || true 98 99cat "$LOG" 100# Check for expected output 101if grep -E -qi "$expect" "$LOG" ; then 102 echo "$test: saw '$expect': ok" 103 exit 0 104else 105 if grep -E -qi XFAIL: "$LOG" ; then 106 echo "$test: saw 'XFAIL': [SKIP]" 107 exit $KSELFTEST_SKIP_TEST 108 else 109 echo "$test: missing '$expect': [FAIL]" 110 exit 1 111 fi 112fi 113