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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 # 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 4 } # die(msg) - game over, man # msg - dying words function die() { log "ERROR: $1" echo "ERROR: $1" >&2 exit 1 } function push_dynamic_debug() { DYNAMIC_DEBUG=$(grep '^kernel/livepatch' /sys/kernel/debug/dynamic_debug/control | \ awk -F'[: ]' '{print "file " $1 " line " $2 " " $4}') } function pop_dynamic_debug() { if [[ -n "$DYNAMIC_DEBUG" ]]; then echo -n "$DYNAMIC_DEBUG" > /sys/kernel/debug/dynamic_debug/control fi } # set_dynamic_debug() - save the current dynamic debug config and tweak # it for the self-tests. Set a script exit trap # that restores the original config. function set_dynamic_debug() { push_dynamic_debug trap pop_dynamic_debug EXIT INT TERM HUP cat <<-EOF > /sys/kernel/debug/dynamic_debug/control file kernel/livepatch/* +p func klp_try_switch_task -p EOF } # 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 $mod module" } # check_result() - verify dmesg output # TODO - better filter, out of order msgs, etc? function check_result { local expect="$*" local result result=$(dmesg | grep -v 'tainting' | grep -e 'livepatch:' -e 'test_klp' | 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 }
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