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-rw-r--r--tools/testing/selftests/livepatch/functions.sh294
1 files changed, 294 insertions, 0 deletions
diff --git a/tools/testing/selftests/livepatch/functions.sh b/tools/testing/selftests/livepatch/functions.sh
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+++ b/tools/testing/selftests/livepatch/functions.sh
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+#!/bin/bash
+# SPDX-License-Identifier: GPL-2.0
+# Copyright (C) 2018 Joe Lawrence <joe.lawrence@redhat.com>
+
+# Shell functions for the rest of the scripts.
+
+MAX_RETRIES=600
+RETRY_INTERVAL=".1" # seconds
+
+# Kselftest framework requirement - SKIP code is 4
+ksft_skip=4
+
+# log(msg) - write message to kernel log
+# msg - insightful words
+function log() {
+ echo "$1" > /dev/kmsg
+}
+
+# skip(msg) - testing can't proceed
+# msg - explanation
+function skip() {
+ log "SKIP: $1"
+ echo "SKIP: $1" >&2
+ exit $ksft_skip
+}
+
+# root test
+function is_root() {
+ uid=$(id -u)
+ if [ $uid -ne 0 ]; then
+ echo "skip all tests: must be run as root" >&2
+ exit $ksft_skip
+ fi
+}
+
+# die(msg) - game over, man
+# msg - dying words
+function die() {
+ log "ERROR: $1"
+ echo "ERROR: $1" >&2
+ exit 1
+}
+
+# save existing dmesg so we can detect new content
+function save_dmesg() {
+ SAVED_DMESG=$(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 " " $4}')
+ FTRACE_ENABLED=$(sysctl --values kernel.ftrace_enabled)
+}
+
+function pop_config() {
+ if [[ -n "$DYNAMIC_DEBUG" ]]; then
+ echo -n "$DYNAMIC_DEBUG" > /sys/kernel/debug/dynamic_debug/control
+ fi
+ if [[ -n "$FTRACE_ENABLED" ]]; then
+ sysctl kernel.ftrace_enabled="$FTRACE_ENABLED" &> /dev/null
+ fi
+}
+
+function set_dynamic_debug() {
+ cat <<-EOF > /sys/kernel/debug/dynamic_debug/control
+ file kernel/livepatch/* +p
+ func klp_try_switch_task -p
+ EOF
+}
+
+function set_ftrace_enabled() {
+ result=$(sysctl -q kernel.ftrace_enabled="$1" 2>&1 && \
+ sysctl kernel.ftrace_enabled 2>&1)
+ echo "livepatch: $result" > /dev/kmsg
+}
+
+function cleanup() {
+ pop_config
+ cleanup_dmesg_file
+}
+
+# setup_config - save the current config and set a script exit trap that
+# restores the original config. Setup the dynamic debug
+# for verbose livepatching output and turn on
+# the ftrace_enabled sysctl.
+function setup_config() {
+ is_root
+ push_config
+ set_dynamic_debug
+ set_ftrace_enabled 1
+ trap cleanup EXIT INT TERM HUP
+}
+
+# loop_until(cmd) - loop a command until it is successful or $MAX_RETRIES,
+# sleep $RETRY_INTERVAL between attempts
+# cmd - command and its arguments to run
+function loop_until() {
+ local cmd="$*"
+ local i=0
+ while true; do
+ eval "$cmd" && return 0
+ [[ $((i++)) -eq $MAX_RETRIES ]] && return 1
+ sleep $RETRY_INTERVAL
+ 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
+ return 0
+ fi
+
+ return 1
+}
+
+function __load_mod() {
+ local mod="$1"; shift
+
+ local msg="% modprobe $mod $*"
+ log "${msg%% }"
+ ret=$(modprobe "$mod" "$@" 2>&1)
+ if [[ "$ret" != "" ]]; then
+ die "$ret"
+ fi
+
+ # Wait for module in sysfs ...
+ loop_until '[[ -e "/sys/module/$mod" ]]' ||
+ die "failed to load module $mod"
+}
+
+
+# load_mod(modname, params) - load a kernel module
+# modname - module name to load
+# params - module parameters to pass to modprobe
+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 $mod"
+
+ __load_mod "$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
+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 $mod is not a livepatch"
+
+ __load_mod "$mod" "$@"
+
+ # Wait for livepatch in sysfs ...
+ loop_until '[[ -e "/sys/kernel/livepatch/$mod" ]]' ||
+ die "failed to load module $mod (sysfs)"
+}
+
+# load_lp(modname, params) - load a kernel module with a livepatch
+# modname - module name to load
+# params - module parameters to pass to modprobe
+function load_lp() {
+ local mod="$1"; shift
+
+ load_lp_nowait "$mod" "$@"
+
+ # Wait until the transition finishes ...
+ loop_until 'grep -q '^0$' /sys/kernel/livepatch/$mod/transition' ||
+ die "failed to complete transition"
+}
+
+# load_failing_mod(modname, params) - load a kernel module, expect to fail
+# modname - module name to load
+# params - module parameters to pass to modprobe
+function load_failing_mod() {
+ local mod="$1"; shift
+
+ local msg="% modprobe $mod $*"
+ log "${msg%% }"
+ ret=$(modprobe "$mod" "$@" 2>&1)
+ if [[ "$ret" == "" ]]; then
+ die "$mod unexpectedly loaded"
+ fi
+ log "$ret"
+}
+
+# unload_mod(modname) - unload a kernel module
+# modname - module name to unload
+function unload_mod() {
+ local mod="$1"
+
+ # Wait for module reference count to clear ...
+ loop_until '[[ $(cat "/sys/module/$mod/refcnt") == "0" ]]' ||
+ die "failed to unload module $mod (refcnt)"
+
+ log "% rmmod $mod"
+ ret=$(rmmod "$mod" 2>&1)
+ if [[ "$ret" != "" ]]; then
+ die "$ret"
+ fi
+
+ # Wait for module in sysfs ...
+ loop_until '[[ ! -e "/sys/module/$mod" ]]' ||
+ die "failed to unload module $mod (/sys/module)"
+}
+
+# unload_lp(modname) - unload a kernel module with a livepatch
+# modname - module name to unload
+function unload_lp() {
+ unload_mod "$1"
+}
+
+# disable_lp(modname) - disable a livepatch
+# modname - module name to unload
+function disable_lp() {
+ local mod="$1"
+
+ log "% echo 0 > /sys/kernel/livepatch/$mod/enabled"
+ echo 0 > /sys/kernel/livepatch/"$mod"/enabled
+
+ # Wait until the transition finishes and the livepatch gets
+ # removed from sysfs...
+ loop_until '[[ ! -e "/sys/kernel/livepatch/$mod" ]]' ||
+ die "failed to disable livepatch $mod"
+}
+
+# set_pre_patch_ret(modname, pre_patch_ret)
+# modname - module name to set
+# pre_patch_ret - new pre_patch_ret value
+function set_pre_patch_ret {
+ local mod="$1"; shift
+ local ret="$1"
+
+ log "% echo $ret > /sys/module/$mod/parameters/pre_patch_ret"
+ echo "$ret" > /sys/module/"$mod"/parameters/pre_patch_ret
+
+ # Wait for sysfs value to hold ...
+ loop_until '[[ $(cat "/sys/module/$mod/parameters/pre_patch_ret") == "$ret" ]]' ||
+ die "failed to set pre_patch_ret parameter for $mod module"
+}
+
+function start_test {
+ local test="$1"
+
+ save_dmesg
+ echo -n "TEST: $test ... "
+ log "===== TEST: $test ====="
+}
+
+# check_result() - verify dmesg output
+# TODO - better filter, out of order msgs, etc?
+function check_result {
+ local expect="$*"
+ 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" - | \
+ grep -e 'livepatch:' -e 'test_klp' | \
+ grep -v '\(tainting\|taints\) kernel' | \
+ sed 's/^\[[ 0-9.]*\] //')
+
+ if [[ "$expect" == "$result" ]] ; then
+ echo "ok"
+ else
+ echo -e "not ok\n\n$(diff -upr --label expected --label result <(echo "$expect") <(echo "$result"))\n"
+ die "livepatch kselftest(s) failed"
+ fi
+
+ cleanup_dmesg_file
+}