selftests/lkdtm: Add tests for LKDTM targets (46d1a0f0) · Commits · 戴 / test

MAINTAINERS

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		@@ -9581,6 +9581,7 @@ LINUX KERNEL DUMP TEST MODULE (LKDTM)
		M: Kees Cook <keescook@chromium.org>
		S: Maintained
		F: drivers/misc/lkdtm/*
		F: tools/testing/selftests/lkdtm/*

		LINUX KERNEL MEMORY CONSISTENCY MODEL (LKMM)
		M: Alan Stern <stern@rowland.harvard.edu>

tools/testing/selftests/Makefile

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		@@ -26,6 +26,7 @@ TARGETS += kexec
		TARGETS += kvm
		TARGETS += lib
		TARGETS += livepatch
		TARGETS += lkdtm
		TARGETS += membarrier
		TARGETS += memfd
		TARGETS += memory-hotplug

tools/testing/selftests/lkdtm/Makefile

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		# SPDX-License-Identifier: GPL-2.0
		# Makefile for LKDTM regression tests

		include ../lib.mk

		# NOTE: $(OUTPUT) won't get default value if used before lib.mk
		TEST_FILES := tests.txt
		TEST_GEN_PROGS = $(patsubst %,$(OUTPUT)/%.sh,$(shell awk '{print $$1}' tests.txt \| sed -e 's/\#//'))
		all: $(TEST_GEN_PROGS)

		$(OUTPUT)/%: run.sh tests.txt
		install -m 0744 run.sh $@

tools/testing/selftests/lkdtm/config

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		CONFIG_LKDTM=y

tools/testing/selftests/lkdtm/run.sh

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		#!/bin/sh
		# SPDX-License-Identifier: GPL-2.0
		#
		# This reads tests.txt for the list of LKDTM tests to invoke. Any marked
		# with a leading "#" are skipped. The rest of the line after the
		# test name is either the text to look for in dmesg for a "success",
		# or the rationale for why a test is marked to be skipped.
		#
		set -e
		TRIGGER=/sys/kernel/debug/provoke-crash/DIRECT
		KSELFTEST_SKIP_TEST=4

		# Verify we have LKDTM available in the kernel.
		if [ ! -r $TRIGGER ] ; then
		/sbin/modprobe -q lkdtm \|\| true
		if [ ! -r $TRIGGER ] ; then
		echo "Cannot find $TRIGGER (missing CONFIG_LKDTM?)"
		else
		echo "Cannot write $TRIGGER (need to run as root?)"
		fi
		# Skip this test
		exit $KSELFTEST_SKIP_TEST
		fi

		# Figure out which test to run from our script name.
		test=$(basename $0 .sh)
		# Look up details about the test from master list of LKDTM tests.
		line=$(egrep '^#?'"$test"'\b' tests.txt)
		if [ -z "$line" ]; then
		echo "Skipped: missing test '$test' in tests.txt"
		exit $KSELFTEST_SKIP_TEST
		fi
		# Check that the test is known to LKDTM.
		if ! egrep -q '^'"$test"'$' "$TRIGGER" ; then
		echo "Skipped: test '$test' missing in $TRIGGER!"
		exit $KSELFTEST_SKIP_TEST
		fi

		# Extract notes/expected output from test list.
		test=$(echo "$line" \| cut -d" " -f1)
		if echo "$line" \| grep -q ' ' ; then
		expect=$(echo "$line" \| cut -d" " -f2-)
		else
		expect=""
		fi

		# If the test is commented out, report a skip
		if echo "$test" \| grep -q '^#' ; then
		test=$(echo "$test" \| cut -c2-)
		if [ -z "$expect" ]; then
		expect="crashes entire system"
		fi
		echo "Skipping $test: $expect"
		exit $KSELFTEST_SKIP_TEST
		fi

		# If no expected output given, assume an Oops with back trace is success.
		if [ -z "$expect" ]; then
		expect="call trace:"
		fi

		# Clear out dmesg for output reporting
		dmesg -c >/dev/null

		# Prepare log for report checking
		LOG=$(mktemp --tmpdir -t lkdtm-XXXXXX)
		cleanup() {
		rm -f "$LOG"
		}
		trap cleanup EXIT

		# Most shells yell about signals and we're expecting the "cat" process
		# to usually be killed by the kernel. So we have to run it in a sub-shell
		# and silence errors.
		($SHELL -c 'cat <(echo '"$test"') >'"$TRIGGER" 2>/dev/null) \|\| true

		# Record and dump the results
		dmesg -c >"$LOG"
		cat "$LOG"
		# Check for expected output
		if egrep -qi "$expect" "$LOG" ; then
		echo "$test: saw '$expect': ok"
		exit 0
		else
		if egrep -qi XFAIL: "$LOG" ; then
		echo "$test: saw 'XFAIL': [SKIP]"
		exit $KSELFTEST_SKIP_TEST
		else
		echo "$test: missing '$expect': [FAIL]"
		exit 1
		fi
		fi

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