diff options
Diffstat (limited to 'tools/testing/selftests/livepatch/functions.sh')
-rw-r--r-- | tools/testing/selftests/livepatch/functions.sh | 138 |
1 files changed, 95 insertions, 43 deletions
diff --git a/tools/testing/selftests/livepatch/functions.sh b/tools/testing/selftests/livepatch/functions.sh index 846c7ed71556..fc4c6a016d38 100644 --- a/tools/testing/selftests/livepatch/functions.sh +++ b/tools/testing/selftests/livepatch/functions.sh @@ -6,6 +6,7 @@ MAX_RETRIES=600 RETRY_INTERVAL=".1" # seconds +KLP_SYSFS_DIR="/sys/kernel/livepatch" # Kselftest framework requirement - SKIP code is 4 ksft_skip=4 @@ -33,6 +34,18 @@ function is_root() { fi } +# Check if we can compile the modules before loading them +function has_kdir() { + if [ -z "$KDIR" ]; then + KDIR="/lib/modules/$(uname -r)/build" + fi + + if [ ! -d "$KDIR" ]; then + echo "skip all tests: KDIR ($KDIR) not available to compile modules." + exit $ksft_skip + fi +} + # die(msg) - game over, man # msg - dying words function die() { @@ -41,17 +54,6 @@ function die() { exit 1 } -# save existing dmesg so we can detect new content -function save_dmesg() { - SAVED_DMESG=$(mktemp --tmpdir -t klp-dmesg-XXXXXX) - dmesg > "$SAVED_DMESG" -} - -# cleanup temporary dmesg file from save_dmesg() -function cleanup_dmesg_file() { - rm -f "$SAVED_DMESG" -} - function push_config() { DYNAMIC_DEBUG=$(grep '^kernel/livepatch' /sys/kernel/debug/dynamic_debug/control | \ awk -F'[: ]' '{print "file " $1 " line " $2 " " $4}') @@ -75,14 +77,29 @@ function set_dynamic_debug() { } function set_ftrace_enabled() { - result=$(sysctl -q kernel.ftrace_enabled="$1" 2>&1 && \ - sysctl kernel.ftrace_enabled 2>&1) - echo "livepatch: $result" > /dev/kmsg + local can_fail=0 + if [[ "$1" == "--fail" ]] ; then + can_fail=1 + shift + fi + + local err=$(sysctl -q kernel.ftrace_enabled="$1" 2>&1) + local result=$(sysctl --values kernel.ftrace_enabled) + + if [[ "$result" != "$1" ]] ; then + if [[ $can_fail -eq 1 ]] ; then + echo "livepatch: $err" | sed 's#/proc/sys/kernel/#kernel.#' > /dev/kmsg + return + fi + + skip "failed to set kernel.ftrace_enabled = $1" + fi + + echo "livepatch: kernel.ftrace_enabled = $result" > /dev/kmsg } function cleanup() { pop_config - cleanup_dmesg_file } # setup_config - save the current config and set a script exit trap that @@ -91,6 +108,7 @@ function cleanup() { # the ftrace_enabled sysctl. function setup_config() { is_root + has_kdir push_config set_dynamic_debug set_ftrace_enabled 1 @@ -110,16 +128,14 @@ function loop_until() { done } -function assert_mod() { - local mod="$1" - - modprobe --dry-run "$mod" &>/dev/null -} - function is_livepatch_mod() { local mod="$1" - if [[ $(modinfo "$mod" | awk '/^livepatch:/{print $NF}') == "Y" ]]; then + if [[ ! -f "test_modules/$mod.ko" ]]; then + die "Can't find \"test_modules/$mod.ko\", try \"make\"" + fi + + if [[ $(modinfo "test_modules/$mod.ko" | awk '/^livepatch:/{print $NF}') == "Y" ]]; then return 0 fi @@ -129,9 +145,9 @@ function is_livepatch_mod() { function __load_mod() { local mod="$1"; shift - local msg="% modprobe $mod $*" + local msg="% insmod test_modules/$mod.ko $*" log "${msg%% }" - ret=$(modprobe "$mod" "$@" 2>&1) + ret=$(insmod "test_modules/$mod.ko" "$@" 2>&1) if [[ "$ret" != "" ]]; then die "$ret" fi @@ -144,13 +160,10 @@ function __load_mod() { # load_mod(modname, params) - load a kernel module # modname - module name to load -# params - module parameters to pass to modprobe +# params - module parameters to pass to insmod function load_mod() { local mod="$1"; shift - assert_mod "$mod" || - skip "unable to load module ${mod}, verify CONFIG_TEST_LIVEPATCH=m and run self-tests as root" - is_livepatch_mod "$mod" && die "use load_lp() to load the livepatch module $mod" @@ -160,13 +173,10 @@ function load_mod() { # load_lp_nowait(modname, params) - load a kernel module with a livepatch # but do not wait on until the transition finishes # modname - module name to load -# params - module parameters to pass to modprobe +# params - module parameters to pass to insmod function load_lp_nowait() { local mod="$1"; shift - assert_mod "$mod" || - skip "unable to load module ${mod}, verify CONFIG_TEST_LIVEPATCH=m and run self-tests as root" - is_livepatch_mod "$mod" || die "module $mod is not a livepatch" @@ -179,7 +189,7 @@ function load_lp_nowait() { # load_lp(modname, params) - load a kernel module with a livepatch # modname - module name to load -# params - module parameters to pass to modprobe +# params - module parameters to pass to insmod function load_lp() { local mod="$1"; shift @@ -192,13 +202,13 @@ function load_lp() { # load_failing_mod(modname, params) - load a kernel module, expect to fail # modname - module name to load -# params - module parameters to pass to modprobe +# params - module parameters to pass to insmod function load_failing_mod() { local mod="$1"; shift - local msg="% modprobe $mod $*" + local msg="% insmod test_modules/$mod.ko $*" log "${msg%% }" - ret=$(modprobe "$mod" "$@" 2>&1) + ret=$(insmod "test_modules/$mod.ko" "$@" 2>&1) if [[ "$ret" == "" ]]; then die "$mod unexpectedly loaded" fi @@ -263,7 +273,15 @@ function set_pre_patch_ret { function start_test { local test="$1" - save_dmesg + # Dump something unique into the dmesg log, then stash the entry + # in LAST_DMESG. The check_result() function will use it to + # find new kernel messages since the test started. + local last_dmesg_msg="livepatch kselftest timestamp: $(date --rfc-3339=ns)" + log "$last_dmesg_msg" + loop_until 'dmesg | grep -q "$last_dmesg_msg"' || + die "buffer busy? can't find canary dmesg message: $last_dmesg_msg" + LAST_DMESG=$(dmesg | grep "$last_dmesg_msg") + echo -n "TEST: $test ... " log "===== TEST: $test =====" } @@ -274,21 +292,55 @@ function check_result { local expect="$*" local result - # Note: when comparing dmesg output, the kernel log timestamps - # help differentiate repeated testing runs. Remove them with a - # post-comparison sed filter. - - result=$(dmesg | comm --nocheck-order -13 "$SAVED_DMESG" - | \ + # Test results include any new dmesg entry since LAST_DMESG, then: + # - include lines matching keywords + # - exclude lines matching keywords + # - filter out dmesg timestamp prefixes + result=$(dmesg | awk -v last_dmesg="$LAST_DMESG" 'p; $0 == last_dmesg { p=1 }' | \ grep -e 'livepatch:' -e 'test_klp' | \ grep -v '\(tainting\|taints\) kernel' | \ sed 's/^\[[ 0-9.]*\] //') if [[ "$expect" == "$result" ]] ; then echo "ok" + elif [[ "$result" == "" ]] ; then + echo -e "not ok\n\nbuffer overrun? can't find canary dmesg entry: $LAST_DMESG\n" + die "livepatch kselftest(s) failed" else echo -e "not ok\n\n$(diff -upr --label expected --label result <(echo "$expect") <(echo "$result"))\n" die "livepatch kselftest(s) failed" fi +} + +# check_sysfs_rights(modname, rel_path, expected_rights) - check sysfs +# path permissions +# modname - livepatch module creating the sysfs interface +# rel_path - relative path of the sysfs interface +# expected_rights - expected access rights +function check_sysfs_rights() { + local mod="$1"; shift + local rel_path="$1"; shift + local expected_rights="$1"; shift - cleanup_dmesg_file + local path="$KLP_SYSFS_DIR/$mod/$rel_path" + local rights=$(/bin/stat --format '%A' "$path") + if test "$rights" != "$expected_rights" ; then + die "Unexpected access rights of $path: $expected_rights vs. $rights" + fi +} + +# check_sysfs_value(modname, rel_path, expected_value) - check sysfs value +# modname - livepatch module creating the sysfs interface +# rel_path - relative path of the sysfs interface +# expected_value - expected value read from the file +function check_sysfs_value() { + local mod="$1"; shift + local rel_path="$1"; shift + local expected_value="$1"; shift + + local path="$KLP_SYSFS_DIR/$mod/$rel_path" + local value=`cat $path` + if test "$value" != "$expected_value" ; then + die "Unexpected value in $path: $expected_value vs. $value" + fi } |