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selftests/livepatch: fix and refactor new dmesg message code
The livepatching kselftests rely on comparing expected vs. observed dmesg output. After each test, new dmesg entries are determined by the 'comm' utility comparing a saved, pre-test copy of dmesg to post-test dmesg output. Alexander reports that the 'comm --nocheck-order -13' invocation used by the tests can be confused when dmesg entry timestamps vary in magnitude (ie, "[ 98.820331]" vs. "[ 100.031067]"), in which case, additional messages are reported as new. The unexpected entries then spoil the test results. Instead of relying on 'comm' or 'diff' to determine new testing dmesg entries, refactor the code: - pre-test : log a unique canary dmesg entry - test : run tests, log messages - post-test : filter dmesg starting from pre-test message Reported-by: Alexander Gordeev <agordeev@linux.ibm.com> Closes: https://lore.kernel.org/live-patching/ZYAimyPYhxVA9wKg@li-008a6a4c-3549-11b2-a85c-c5cc2836eea2.ibm.com/ Signed-off-by: Joe Lawrence <joe.lawrence@redhat.com> Acked-by: Alexander Gordeev <agordeev@linux.ibm.com> Tested-by: Marcos Paulo de Souza <mpdesouza@suse.com> Reviewed-by: Marcos Paulo de Souza <mpdesouza@suse.com> Acked-by: Miroslav Benes <mbenes@suse.cz> Signed-off-by: Shuah Khan <skhan@linuxfoundation.org>
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@ -42,17 +42,6 @@ function die() {
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exit 1
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exit 1
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}
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}
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# save existing dmesg so we can detect new content
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function save_dmesg() {
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SAVED_DMESG=$(mktemp --tmpdir -t klp-dmesg-XXXXXX)
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dmesg > "$SAVED_DMESG"
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}
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# cleanup temporary dmesg file from save_dmesg()
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function cleanup_dmesg_file() {
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rm -f "$SAVED_DMESG"
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}
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function push_config() {
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function push_config() {
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DYNAMIC_DEBUG=$(grep '^kernel/livepatch' /sys/kernel/debug/dynamic_debug/control | \
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DYNAMIC_DEBUG=$(grep '^kernel/livepatch' /sys/kernel/debug/dynamic_debug/control | \
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awk -F'[: ]' '{print "file " $1 " line " $2 " " $4}')
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awk -F'[: ]' '{print "file " $1 " line " $2 " " $4}')
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@ -99,7 +88,6 @@ function set_ftrace_enabled() {
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function cleanup() {
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function cleanup() {
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pop_config
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pop_config
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cleanup_dmesg_file
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}
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}
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# setup_config - save the current config and set a script exit trap that
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# setup_config - save the current config and set a script exit trap that
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@ -280,7 +268,15 @@ function set_pre_patch_ret {
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function start_test {
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function start_test {
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local test="$1"
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local test="$1"
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save_dmesg
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# Dump something unique into the dmesg log, then stash the entry
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# in LAST_DMESG. The check_result() function will use it to
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# find new kernel messages since the test started.
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local last_dmesg_msg="livepatch kselftest timestamp: $(date --rfc-3339=ns)"
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log "$last_dmesg_msg"
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loop_until 'dmesg | grep -q "$last_dmesg_msg"' ||
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die "buffer busy? can't find canary dmesg message: $last_dmesg_msg"
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LAST_DMESG=$(dmesg | grep "$last_dmesg_msg")
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echo -n "TEST: $test ... "
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echo -n "TEST: $test ... "
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log "===== TEST: $test ====="
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log "===== TEST: $test ====="
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}
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}
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@ -291,23 +287,24 @@ function check_result {
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local expect="$*"
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local expect="$*"
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local result
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local result
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# Note: when comparing dmesg output, the kernel log timestamps
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# Test results include any new dmesg entry since LAST_DMESG, then:
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# help differentiate repeated testing runs. Remove them with a
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# - include lines matching keywords
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# post-comparison sed filter.
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# - exclude lines matching keywords
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# - filter out dmesg timestamp prefixes
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result=$(dmesg | comm --nocheck-order -13 "$SAVED_DMESG" - | \
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result=$(dmesg | awk -v last_dmesg="$LAST_DMESG" 'p; $0 == last_dmesg { p=1 }' | \
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grep -e 'livepatch:' -e 'test_klp' | \
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grep -e 'livepatch:' -e 'test_klp' | \
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grep -v '\(tainting\|taints\) kernel' | \
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grep -v '\(tainting\|taints\) kernel' | \
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sed 's/^\[[ 0-9.]*\] //')
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sed 's/^\[[ 0-9.]*\] //')
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if [[ "$expect" == "$result" ]] ; then
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if [[ "$expect" == "$result" ]] ; then
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echo "ok"
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echo "ok"
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elif [[ "$result" == "" ]] ; then
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echo -e "not ok\n\nbuffer overrun? can't find canary dmesg entry: $LAST_DMESG\n"
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die "livepatch kselftest(s) failed"
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else
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else
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echo -e "not ok\n\n$(diff -upr --label expected --label result <(echo "$expect") <(echo "$result"))\n"
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echo -e "not ok\n\n$(diff -upr --label expected --label result <(echo "$expect") <(echo "$result"))\n"
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die "livepatch kselftest(s) failed"
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die "livepatch kselftest(s) failed"
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fi
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fi
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cleanup_dmesg_file
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}
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}
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# check_sysfs_rights(modname, rel_path, expected_rights) - check sysfs
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# check_sysfs_rights(modname, rel_path, expected_rights) - check sysfs
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