113 lines
3.1 KiB
Bash
113 lines
3.1 KiB
Bash
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#!/bin/sh
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# SPDX-License-Identifier: GPL-2.0
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#
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# This reads tests.txt for the list of LKDTM tests to invoke. Any marked
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# with a leading "#" are skipped. The rest of the line after the
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# test name is either the text to look for in dmesg for a "success",
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# or the rationale for why a test is marked to be skipped.
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#
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set -e
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TRIGGER=/sys/kernel/debug/provoke-crash/DIRECT
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CLEAR_ONCE=/sys/kernel/debug/clear_warn_once
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KSELFTEST_SKIP_TEST=4
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# Verify we have LKDTM available in the kernel.
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if [ ! -r $TRIGGER ] ; then
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/sbin/modprobe -q lkdtm || true
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if [ ! -r $TRIGGER ] ; then
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echo "Cannot find $TRIGGER (missing CONFIG_LKDTM?)"
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else
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echo "Cannot write $TRIGGER (need to run as root?)"
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fi
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# Skip this test
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exit $KSELFTEST_SKIP_TEST
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fi
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# Figure out which test to run from our script name.
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test=$(basename $0 .sh)
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# Look up details about the test from master list of LKDTM tests.
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line=$(grep -E '^#?'"$test"'\b' tests.txt)
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if [ -z "$line" ]; then
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echo "Skipped: missing test '$test' in tests.txt"
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exit $KSELFTEST_SKIP_TEST
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fi
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# Check that the test is known to LKDTM.
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if ! grep -E -q '^'"$test"'$' "$TRIGGER" ; then
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echo "Skipped: test '$test' missing in $TRIGGER!"
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exit $KSELFTEST_SKIP_TEST
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fi
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# Extract notes/expected output from test list.
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test=$(echo "$line" | cut -d" " -f1)
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if echo "$line" | grep -q ' ' ; then
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expect=$(echo "$line" | cut -d" " -f2-)
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else
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expect=""
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fi
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# If the test is commented out, report a skip
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if echo "$test" | grep -q '^#' ; then
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test=$(echo "$test" | cut -c2-)
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if [ -z "$expect" ]; then
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expect="crashes entire system"
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fi
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echo "Skipping $test: $expect"
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exit $KSELFTEST_SKIP_TEST
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fi
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# If no expected output given, assume an Oops with back trace is success.
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repeat=1
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if [ -z "$expect" ]; then
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expect="call trace:"
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else
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if echo "$expect" | grep -q '^repeat:' ; then
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repeat=$(echo "$expect" | cut -d' ' -f1 | cut -d: -f2)
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expect=$(echo "$expect" | cut -d' ' -f2-)
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fi
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fi
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# Prepare log for report checking
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LOG=$(mktemp --tmpdir -t lkdtm-log-XXXXXX)
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DMESG=$(mktemp --tmpdir -t lkdtm-dmesg-XXXXXX)
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cleanup() {
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rm -f "$LOG" "$DMESG"
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}
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trap cleanup EXIT
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# Reset WARN_ONCE counters so we trip it each time this runs.
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if [ -w $CLEAR_ONCE ] ; then
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echo 1 > $CLEAR_ONCE
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fi
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# Save existing dmesg so we can detect new content below
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dmesg > "$DMESG"
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# Since the kernel is likely killing the process writing to the trigger
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# file, it must not be the script's shell itself. i.e. we cannot do:
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# echo "$test" >"$TRIGGER"
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# Instead, use "cat" to take the signal. Since the shell will yell about
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# the signal that killed the subprocess, we must ignore the failure and
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# continue. However we don't silence stderr since there might be other
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# useful details reported there in the case of other unexpected conditions.
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for i in $(seq 1 $repeat); do
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echo "$test" | cat >"$TRIGGER" || true
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done
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# Record and dump the results
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dmesg | comm --nocheck-order -13 "$DMESG" - > "$LOG" || true
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cat "$LOG"
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# Check for expected output
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if grep -E -qi "$expect" "$LOG" ; then
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echo "$test: saw '$expect': ok"
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exit 0
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else
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if grep -E -qi XFAIL: "$LOG" ; then
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echo "$test: saw 'XFAIL': [SKIP]"
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exit $KSELFTEST_SKIP_TEST
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else
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echo "$test: missing '$expect': [FAIL]"
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exit 1
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fi
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fi
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