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#!/bin/bash # # kpatch hot patch module management script # # Copyright (C) 2014 Seth Jennings <sjenning@redhat.com> # Copyright (C) 2014 Josh Poimboeuf <jpoimboe@redhat.com> # # This program is free software; you can redistribute it and/or # modify it under the terms of the GNU General Public License # as published by the Free Software Foundation; either version 2 # of the License, or (at your option) any later version. # # This program is distributed in the hope that it will be useful, # but WITHOUT ANY WARRANTY; without even the implied warranty of # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the # GNU General Public License for more details. # # You should have received a copy of the GNU General Public License # along with this program; if not, write to the Free Software # Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA, # 02110-1301, USA. # This is the kpatch user script that manages installing, loading, and # displaying information about kernel patch modules installed on the system. INSTALLDIR=/var/lib/kpatch SCRIPTDIR="$(readlink -f "$(dirname "$(type -p "$0")")")" VERSION="0.6.1" POST_ENABLE_WAIT=15 # seconds POST_SIGNAL_WAIT=60 # seconds # How many times to try loading the patch if activeness safety check fails. MAX_LOAD_ATTEMPTS=5 # How long to wait before retry, in seconds. RETRY_INTERVAL=2 usage_cmd() { printf ' %-20s\n %s\n' "$1" "$2" >&2 } usage () { # ATTENTION ATTENTION ATTENTION ATTENTION ATTENTION ATTENTION # When changing this, please also update the man page. Thanks! echo "usage: kpatch <command> [<args>]" >&2 echo >&2 echo "Valid commands:" >&2 usage_cmd "install [-k|--kernel-version=<kernel version>] <module>" "install patch module to be loaded at boot" usage_cmd "uninstall [-k|--kernel-version=<kernel version>] <module>" "uninstall patch module" echo >&2 usage_cmd "load --all" "load all installed patch modules into the running kernel" usage_cmd "load <module>" "load patch module into the running kernel" usage_cmd "unload --all (UNSUPPORTED)" "unload all patch modules from the running kernel" usage_cmd "unload <module> (UNSUPPORTED)" "unload patch module from the running kernel" echo >&2 usage_cmd "info <module>" "show information about a patch module" echo >&2 usage_cmd "list" "list installed patch modules" echo >&2 usage_cmd "signal" "signal/poke any process stalling the current patch transition" echo >&2 usage_cmd "version" "display the kpatch version" exit 1 } warn() { echo "kpatch: $*" >&2 } die() { warn "$@" exit 1 } confirm_prompt() { local prompt="$1" local answer while true; do read -rp "$prompt [Y/N] " answer [[ $answer == 'Y' || $answer == 'y' ]] && return 0 [[ $answer == 'N' || $answer == 'n' ]] && return 1 done } __find_module () { MODULE="$1" [[ -f "$MODULE" ]] && return MODULE="$INSTALLDIR/$(uname -r)/$1" [[ -f "$MODULE" ]] && return return 1 } mod_name () { MODNAME="$(basename "$1")" MODNAME="${MODNAME%.ko}" MODNAME="${MODNAME//-/_}" } find_module () { arg="$1" if [[ "$arg" =~ \.ko ]]; then __find_module "$arg" || return 1 mod_name "$MODULE" return else for i in "$INSTALLDIR/$(uname -r)"/*; do mod_name "$i" if [[ "$MODNAME" == "$arg" ]]; then MODULE="$i" return fi done fi return 1 } find_core_module() { COREMOD="$SCRIPTDIR"/../kmod/core/kpatch.ko [[ -f "$COREMOD" ]] && return COREMOD="/usr/local/lib/kpatch/$(uname -r)/kpatch.ko" [[ -f "$COREMOD" ]] && return COREMOD="/usr/lib/kpatch/$(uname -r)/kpatch.ko" [[ -f "$COREMOD" ]] && return COREMOD="/usr/local/lib/modules/$(uname -r)/extra/kpatch/kpatch.ko" [[ -f "$COREMOD" ]] && return COREMOD="/usr/lib/modules/$(uname -r)/extra/kpatch/kpatch.ko" [[ -f "$COREMOD" ]] && return return 1 } core_loaded () { grep -q -e "T klp_enable_patch" -e "T kpatch_register" /proc/kallsyms } get_module_name () { readelf -p .gnu.linkonce.this_module "$1" | grep '\[.*\]' | awk '{print $3}' } init_sysfs_var() { # If the kernel is configured with CONFIG_LIVEPATCH, use that. # Otherwise, use the kpatch core module (kpatch.ko). if [[ -e /sys/kernel/livepatch ]] ; then # livepatch ABI SYSFS="/sys/kernel/livepatch" elif [[ -e /sys/kernel/kpatch/patches ]] ; then # kpatch pre-0.4 ABI SYSFS="/sys/kernel/kpatch/patches" else # kpatch 0.4 ABI SYSFS="/sys/kernel/kpatch" fi } verify_module_checksum () { modname="$(get_module_name "$1")" [[ -z "$modname" ]] && return 1 checksum="$(readelf -p .kpatch.checksum "$1" 2>&1 | grep '\[.*\]' | awk '{print $3}')" # Fail checksum match only if both exist and diverge if [[ ! -z "$checksum" ]] && [[ -e "$SYSFS/${modname}/checksum" ]] ; then sysfs_checksum="$(cat "$SYSFS/${modname}/checksum")" [[ "$checksum" == "$sysfs_checksum" ]] || return 1 fi return 0 } in_transition() { local moddir="$SYSFS/$1" [[ $(cat "$moddir/transition" 2>/dev/null) == "1" ]] && return 0 return 1 } is_stalled() { local module="$1" local pid="$2" local patch_enabled local patch_state patch_enabled="$(cat "$SYSFS/$module/enabled" 2>/dev/null)" patch_state="$(cat "/proc/$pid/patch_state" 2>/dev/null)" # No patch transition in progress [[ "$patch_state" == "-1" ]] && return 1 [[ -z "$patch_enabled" ]] || [[ -z "$patch_state" ]] && return 1 # Stalls can be determined if the process state does not match # the transition target (ie, "enabled" and "patched", "disabled" # and "unpatched"). The state value enumerations match, so we # can just compare them directly: [[ "$patch_enabled" != "$patch_state" ]] && return 0 return 1 } get_transition_patch() { local module local modname for module in "$SYSFS"/*; do modname=$(basename "$module") if in_transition "$modname" ; then echo "$modname" return fi done } show_stalled_processes() { local module local proc_task local tid module=$(get_transition_patch) [[ -z "$module" ]] && return echo "" echo "Stalled processes:" for proc_task in /proc/[0-9]*/task/[0-9]*; do tid=${proc_task#*/task/} is_stalled "$module" "$tid" && echo "$tid $(cat "$proc_task"/comm 2>/dev/null)" done } signal_stalled_processes() { local module local proc_task local tid module=$(get_transition_patch) [[ -z "$module" ]] && return if [[ -e "/sys/kernel/livepatch/$module/signal" ]] ; then echo 1 > "/sys/kernel/livepatch/$module/signal" else for proc_task in /proc/[0-9]*/task/[0-9]*; do tid=${proc_task#*/task/} if is_stalled "$module" "$tid" ; then if [[ "$tid" -eq "$$" ]] ; then echo "skipping pid $tid $(cat "$proc_task"/comm 2>/dev/null)" else echo "signaling pid $tid $(cat "$proc_task"/comm 2>/dev/null)" kill -SIGSTOP "$tid" sleep .1 kill -SIGCONT "$tid" fi fi done fi } wait_for_patch_transition() { local module="$1" local i in_transition "$module" || return 0 echo "waiting (up to $POST_ENABLE_WAIT seconds) for patch transition to complete..." for (( i=0; i<POST_ENABLE_WAIT; i++ )); do if ! in_transition "$module" ; then echo "transition complete ($i seconds)" return 0 fi sleep 1s done echo "patch transition has stalled, signaling stalled process(es):" signal_stalled_processes echo "waiting (up to $POST_SIGNAL_WAIT seconds) for patch transition to complete..." for (( i=0; i<POST_SIGNAL_WAIT; i++ )); do if ! in_transition "$module" ; then echo "transition complete ($i seconds)" return 0 fi sleep 1s done return 1 } load_module () { local module="$1" if ! core_loaded; then if modprobe -q kpatch; then echo "loaded core module" else find_core_module || die "can't find core module" echo "loading core module: $COREMOD" insmod "$COREMOD" || die "failed to load core module" fi # Now that the core module has been loaded, set $SYSFS to the # correct value based on the loaded core module's ABI. init_sysfs_var fi local modname modname="$(get_module_name "$module")" local moddir="$SYSFS/$modname" if [[ -d "$moddir" ]] ; then if [[ "$(cat "${moddir}/enabled")" -eq 0 ]]; then if verify_module_checksum "$module"; then # same checksum echo "module already loaded, re-enabling" echo 1 > "${moddir}/enabled" || die "failed to re-enable module $modname" if ! wait_for_patch_transition "$modname" ; then echo "module $modname did not complete its transition, disabling..." echo 0 > "${moddir}/enabled" || die "failed to disable module $modname" wait_for_patch_transition "$modname" die "error: failed to re-enable module $modname (transition stalled), patch disabled" fi return else die "error: cannot re-enable patch module $modname, cannot verify checksum match" fi else echo "module named $modname already loaded and enabled" fi else echo "loading patch module: $module" local i=0 while true; do out="$(LC_ALL=C insmod "$module" 2>&1)" [[ -z "$out" ]] && break echo "$out" 1>&2 [[ ! "$out" =~ "Device or resource busy" ]] && die "failed to load module $module" # "Device or resource busy" means the activeness safety check # failed. Retry in a few seconds. i=$((i+1)) if [[ $i -eq $MAX_LOAD_ATTEMPTS ]]; then die "failed to load module $module" break else warn "retrying..." sleep $RETRY_INTERVAL fi done fi if ! wait_for_patch_transition "$modname" ; then echo "module $modname did not complete its transition, unloading..." unload_module "$modname" die "error: failed to load module $modname (transition stalled)" fi return 0 } disable_patch () { local modname="$1" local enabled="$SYSFS/$modname/enabled" [[ -e "$enabled" ]] || die "patch module $1 is not loaded" if [[ "$(cat "$enabled")" -eq 1 ]]; then echo "disabling patch module: $modname" local i=0 while true; do out="$(export LC_ALL=C; sh -c "echo 0 > $enabled" 2>&1)" [[ -z "$out" ]] && break echo "$out" 1>&2 if [[ ! "$out" =~ "Device or resource busy" ]]; then die "failed to disable module $modname" fi # "Device or resource busy" means the activeness safety check # failed. Retry in a few seconds. i=$((i+1)) if [[ $i -eq $MAX_LOAD_ATTEMPTS ]]; then die "failed to disable module $modname" else warn "retrying..." sleep $RETRY_INTERVAL fi done fi if ! wait_for_patch_transition "$modname" ; then die "transition stalled for $modname" fi } unload_module () { PATCH="${1//-/_}" PATCH="${PATCH%.ko}" disable_patch "$PATCH" echo "unloading patch module: $PATCH" # ignore any error here because rmmod can fail if the module used # KPATCH_FORCE_UNSAFE. rmmod "$PATCH" 2> /dev/null || return 0 } get_module_version() { MODVER="$(modinfo -F vermagic "$1")" || return 1 MODVER="${MODVER/ */}" } unset MODULE # Initialize the $SYSFS var. This only works if the core module has been # loaded. Otherwise, the value of $SYSFS doesn't matter at this point anyway, # and we'll have to call this function again after loading it. init_sysfs_var [[ "$#" -lt 1 ]] && usage # RHEL-specific support options case "$1" in "force") # For scripting purposes, support "kpatch force unload". # Shift out the "force" to avoid the user-prompt check below. shift ;; "unload") confirm_prompt "WARNING: Red Hat doesn't support unloading of kpatches, continue anyway?" || exit 1 ;; esac case "$1" in "load") [[ "$#" -ne 2 ]] && usage case "$2" in "--all") for i in "$INSTALLDIR/$(uname -r)"/*.ko; do [[ -e "$i" ]] || continue load_module "$i" || die "failed to load module $i" done ;; *) PATCH="$2" find_module "$PATCH" || die "can't find $PATCH" load_module "$MODULE" || die "failed to load module $PATCH" ;; esac ;; "unload") [[ "$#" -ne 2 ]] && usage case "$2" in "--all") for module in "$SYSFS"/*; do [[ -e "$module" ]] || continue unload_module "$(basename "$module")" || die "failed to unload module $module" done ;; *) unload_module "$(basename "$2")" || die "failed to unload module $2" ;; esac ;; "install") KVER="$(uname -r)" shift options="$(getopt -o k: -l "kernel-version:" -- "$@")" || die "getopt failed" eval set -- "$options" while [[ $# -gt 0 ]]; do case "$1" in -k|--kernel-version) KVER="$2" shift ;; --) [[ -z "$2" ]] && die "no module file specified" PATCH="$2" ;; esac shift done [[ ! -e "$PATCH" ]] && die "$PATCH doesn't exist" [[ "${PATCH: -3}" == ".ko" ]] || die "$PATCH isn't a .ko file" get_module_version "$PATCH" || die "modinfo failed" [[ "$KVER" != "$MODVER" ]] && die "invalid module version $MODVER for kernel $KVER" [[ -e "$INSTALLDIR/$KVER/$(basename "$PATCH")" ]] && die "$PATCH is already installed" echo "installing $PATCH ($KVER)" mkdir -p "$INSTALLDIR/$KVER" || die "failed to create install directory" cp -f "$PATCH" "$INSTALLDIR/$KVER" || die "failed to install module $PATCH" systemctl enable kpatch.service ;; "uninstall") KVER="$(uname -r)" shift options="$(getopt -o k: -l "kernel-version:" -- "$@")" || die "getopt failed" eval set -- "$options" while [[ $# -gt 0 ]]; do case "$1" in -k|--kernel-version) KVER="$2" shift ;; --) [[ -z "$2" ]] && die "no module file specified" PATCH="$2" [[ "$PATCH" != "$(basename "$PATCH")" ]] && die "please supply patch module name without path" ;; esac shift done MODULE="$INSTALLDIR/$KVER/$PATCH" if [[ ! -f "$MODULE" ]]; then mod_name "$PATCH" PATCHNAME="$MODNAME" for i in "$INSTALLDIR/$KVER"/*; do mod_name "$i" if [[ "$MODNAME" == "$PATCHNAME" ]]; then MODULE="$i" break fi done fi [[ ! -e "$MODULE" ]] && die "$PATCH is not installed for kernel $KVER" echo "uninstalling $PATCH ($KVER)" rm -f "$MODULE" || die "failed to uninstall module $PATCH" ;; "list") [[ "$#" -ne 1 ]] && usage echo "Loaded patch modules:" for module in "$SYSFS"/*; do if [[ -e "$module" ]]; then modname=$(basename "$module") if [[ "$(cat "$module/enabled" 2>/dev/null)" -eq 1 ]]; then in_transition "$modname" && state="enabling..." \ || state="enabled" else in_transition "$modname" && state="disabling..." \ || state="disabled" fi echo "$modname [$state]" fi done show_stalled_processes echo "" echo "Installed patch modules:" for kdir in "$INSTALLDIR"/*; do [[ -e "$kdir" ]] || continue for module in "$kdir"/*.ko; do [[ -e "$module" ]] || continue mod_name "$module" echo "$MODNAME ($(basename "$kdir"))" done done ;; "info") [[ "$#" -ne 2 ]] && usage PATCH="$2" find_module "$PATCH" || die "can't find $PATCH" echo "Patch information for $PATCH:" modinfo "$MODULE" || die "failed to get info for module $PATCH" ;; "signal") [[ "$#" -ne 1 ]] && usage signal_stalled_processes ;; "help"|"-h"|"--help") usage ;; "version"|"-v"|"--version") echo "$VERSION" ;; *) echo "subcommand $1 not recognized" usage ;; esac
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