dda81d72c2
The temporary directory is currently created under the current working
directory. That alone isn't ideal but works most of the time. However,
it will fail when the current working directory is not writable. So make
sure the directory is created within TMPDIR.
Fixes: ea00b7d ("kdumpctl: Move temp file in get_kernel_size to global temp dir")
Signed-off-by: Philipp Rudo <prudo@redhat.com>
Reviewed-by: Coiby Xu <coxu@redhat.com>
1862 lines
47 KiB
Bash
Executable File
1862 lines
47 KiB
Bash
Executable File
#!/bin/bash
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KEXEC=/sbin/kexec
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KDUMP_KERNELVER=""
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KDUMP_KERNEL=""
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KDUMP_COMMANDLINE=""
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KEXEC_ARGS=""
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KDUMP_LOG_PATH="/var/log"
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MKDUMPRD="/sbin/mkdumprd -f"
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MKFADUMPRD="/sbin/mkfadumprd"
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DRACUT_MODULES_FILE="/usr/lib/dracut/modules.txt"
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DEFAULT_INITRD=""
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DEFAULT_INITRD_BAK=""
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INITRD_CHECKSUM_LOCATION=""
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KDUMP_INITRD=""
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TARGET_INITRD=""
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#kdump shall be the default dump mode
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DEFAULT_DUMP_MODE="kdump"
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standard_kexec_args="-d -p"
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# Some default values in case /etc/sysconfig/kdump doesn't include
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KDUMP_COMMANDLINE_REMOVE="hugepages hugepagesz slub_debug"
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declare -A OPT
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if [[ -f /etc/sysconfig/kdump ]]; then
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. /etc/sysconfig/kdump
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fi
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[[ $dracutbasedir ]] || dracutbasedir=/usr/lib/dracut
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. $dracutbasedir/dracut-functions.sh
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if [[ ${__SOURCED__:+x} ]]; then
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KDUMP_LIB_PATH=.
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else
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KDUMP_LIB_PATH=/lib/kdump
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fi
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. $KDUMP_LIB_PATH/kdump-lib.sh
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. $KDUMP_LIB_PATH/kdump-logger.sh
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#initiate the kdump logger
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if ! dlog_init; then
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echo "failed to initiate the kdump logger."
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exit 1
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fi
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KDUMP_TMPDIR=$(mktemp --tmpdir -d kdump.XXXX)
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trap '
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ret=$?;
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rm -rf "$KDUMP_TMPDIR"
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exit $ret;
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' EXIT
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_get_dracut_arg()
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{
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local shortopt longopt n tmp
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local -a _opt _ret
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shortopt=$1; shift
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longopt=$1; shift
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n=0
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if [[ -n $shortopt ]]; then
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_opt+=(-o "${shortopt#-}:")
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else
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# getopt requires the -o/--option to be set.
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_opt+=(-o "")
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fi
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[[ -n $longopt ]] && _opt+=(--long "${longopt#--}:")
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# make sure bash didn't break quoting
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eval set -- "$*"
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tmp=$(
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unset POSIXLY_CORRECT
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getopt -q "${_opt[@]}" -- "$@"
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)
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eval set -- "$tmp"
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while :; do
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case $1 in
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"$shortopt"|"$longopt")
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_ret+=("$2"); shift
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n=$((n+1))
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;;
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--|*)
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break
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;;
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esac
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shift
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done
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echo "${_ret[@]}"
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return $n
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}
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is_dracut_mod_omitted()
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{
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local mod omitted
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mod=$1
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omitted=$(_get_dracut_arg -o --omit "${OPT[dracut_args]}")
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[[ " $omitted " == *" $mod "* ]]
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}
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single_instance_lock()
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{
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local rc timeout=5 lockfile
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if [[ -d /run/lock ]]; then
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lockfile=/run/lock/kdump
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else
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# when updating package using virt-customize, /run/lock doesn't exist
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lockfile=/tmp/kdump.lock
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fi
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if ! exec 9> $lockfile; then
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derror "Create file lock failed"
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exit 1
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fi
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flock -n 9
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rc=$?
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while [[ $rc -ne 0 ]]; do
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dinfo "Another app is currently holding the kdump lock; waiting for it to exit..."
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flock -w $timeout 9
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rc=$?
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done
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}
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determine_dump_mode()
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{
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# Check if firmware-assisted dump is enabled
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# if yes, set the dump mode as fadump
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if is_fadump_capable; then
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dinfo "Dump mode is fadump"
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DEFAULT_DUMP_MODE="fadump"
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fi
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ddebug "DEFAULT_DUMP_MODE=$DEFAULT_DUMP_MODE"
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}
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rebuild_fadump_initrd()
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{
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if ! $MKFADUMPRD "$DEFAULT_INITRD_BAK" "$TARGET_INITRD" --kver "$KDUMP_KERNELVER"; then
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derror "mkfadumprd: failed to make fadump initrd"
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return 1
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fi
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sync -f "$TARGET_INITRD"
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return 0
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}
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check_earlykdump_is_enabled()
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{
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grep -q -w "rd.earlykdump" /proc/cmdline
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}
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rebuild_kdump_initrd()
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{
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ddebug "rebuild kdump initrd: $MKDUMPRD $TARGET_INITRD $KDUMP_KERNELVER"
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if ! $MKDUMPRD "$TARGET_INITRD" "$KDUMP_KERNELVER"; then
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derror "mkdumprd: failed to make kdump initrd"
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return 1
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fi
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if check_earlykdump_is_enabled; then
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dwarn "Tips: If early kdump is enabled, also require rebuilding the system initramfs to make the changes take effect for early kdump."
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fi
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sync -f "$TARGET_INITRD"
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return 0
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}
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rebuild_initrd()
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{
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dinfo "Rebuilding $TARGET_INITRD"
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if [[ ! -w $(dirname "$TARGET_INITRD") ]]; then
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derror "$(dirname "$TARGET_INITRD") does not have write permission. Cannot rebuild $TARGET_INITRD"
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return 1
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fi
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if [[ $DEFAULT_DUMP_MODE == "fadump" ]]; then
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rebuild_fadump_initrd
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else
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rebuild_kdump_initrd
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fi
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}
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#$1: the files to be checked with IFS=' '
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check_exist()
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{
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for file in $1; do
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if [[ ! -e $file ]]; then
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derror "Error: $file not found."
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return 1
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fi
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done
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}
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#$1: the files to be checked with IFS=' '
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check_executable()
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{
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for file in $1; do
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if [[ ! -x $file ]]; then
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derror "Error: $file is not executable."
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return 1
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fi
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done
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}
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backup_default_initrd()
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{
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ddebug "backup default initrd: $DEFAULT_INITRD"
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if [[ ! -f $DEFAULT_INITRD ]]; then
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return
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fi
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if [[ ! -e $DEFAULT_INITRD_BAK ]]; then
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dinfo "Backing up $DEFAULT_INITRD before rebuild."
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# save checksum to verify before restoring
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sha1sum "$DEFAULT_INITRD" > "$INITRD_CHECKSUM_LOCATION"
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if ! cp "$DEFAULT_INITRD" "$DEFAULT_INITRD_BAK"; then
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dwarn "WARNING: failed to backup $DEFAULT_INITRD."
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rm -f -- "$INITRD_CHECKSUM_LOCATION"
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rm -f -- "$DEFAULT_INITRD_BAK"
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fi
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fi
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}
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restore_default_initrd()
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{
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ddebug "restore default initrd: $DEFAULT_INITRD"
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if [[ ! -f $DEFAULT_INITRD ]]; then
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return
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fi
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# If a backup initrd exists, we must be switching back from
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# fadump to kdump. Restore the original default initrd.
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if [[ -f $DEFAULT_INITRD_BAK ]] && [[ -f $INITRD_CHECKSUM_LOCATION ]]; then
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# verify checksum before restoring
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backup_checksum=$(sha1sum "$DEFAULT_INITRD_BAK" | awk '{ print $1 }')
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default_checksum=$(awk '{ print $1 }' "$INITRD_CHECKSUM_LOCATION")
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if [[ $default_checksum != "$backup_checksum" ]]; then
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dwarn "WARNING: checksum mismatch! Can't restore original initrd.."
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else
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rm -f $INITRD_CHECKSUM_LOCATION
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if mv "$DEFAULT_INITRD_BAK" "$DEFAULT_INITRD"; then
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derror "Restoring original initrd as fadump mode is disabled."
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sync -f "$DEFAULT_INITRD"
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fi
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fi
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fi
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}
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_set_config()
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{
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local opt=$1
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local val=$2
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if [[ -z $val ]]; then
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derror "Invalid kdump config value for option '$opt'"
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return 1
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fi
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if [[ -n ${OPT[$opt]} ]]; then
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if [[ $opt == _target ]] || [[ $opt == _fstype ]]; then
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derror "More than one dump targets specified"
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else
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derror "Duplicated kdump config value of option $opt"
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fi
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return 1
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fi
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OPT[$opt]="$val"
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}
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parse_config()
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{
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while read -r config_opt config_val; do
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case "$config_opt" in
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dracut_args)
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if [[ $config_val == *--mount* ]]; then
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if [[ $(echo "$config_val" | grep -o -- "--mount" | wc -l) -ne 1 ]]; then
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derror 'Multiple mount targets specified in one "dracut_args".'
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return 1
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fi
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_set_config _fstype "$(get_dracut_args_fstype "$config_val")" || return 1
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_set_config _target "$(get_dracut_args_target "$config_val")" || return 1
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fi
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;;
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raw)
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if [[ -d "/proc/device-tree/ibm,opal/dump" ]]; then
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dwarn "WARNING: Won't capture opalcore when 'raw' dump target is used."
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fi
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_set_config _fstype "$config_opt" || return 1
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config_opt=_target
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;;
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ext[234] | minix | btrfs | xfs | nfs | ssh | virtiofs)
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_set_config _fstype "$config_opt" || return 1
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config_opt=_target
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;;
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sshkey)
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if [[ -z $config_val ]]; then
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derror "Invalid kdump config value for option '$config_opt'"
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return 1
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elif [[ -f $config_val ]]; then
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config_val=$(/usr/bin/readlink -m "$config_val")
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else
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dwarn "WARNING: '$config_val' doesn't exist, using default value '$DEFAULT_SSHKEY'"
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config_val=$DEFAULT_SSHKEY
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fi
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;;
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default)
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dwarn "WARNING: Option 'default' was renamed 'failure_action' and will be removed in the future."
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dwarn "Please update $KDUMP_CONFIG_FILE to use option 'failure_action' instead."
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_set_config failure_action "$config_val" || return 1
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;;
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path | core_collector | kdump_post | kdump_pre | extra_bins | extra_modules | failure_action | final_action | force_rebuild | force_no_rebuild | fence_kdump_args | fence_kdump_nodes | auto_reset_crashkernel) ;;
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net | options | link_delay | disk_timeout | debug_mem_level | blacklist)
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derror "Deprecated kdump config option: $config_opt. Refer to kdump.conf manpage for alternatives."
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return 1
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;;
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'')
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continue
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;;
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*)
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derror "Invalid kdump config option $config_opt"
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return 1
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;;
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esac
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_set_config "$config_opt" "$config_val" || return 1
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done <<< "$(kdump_read_conf)"
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OPT[path]=${OPT[path]:-$DEFAULT_PATH}
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OPT[sshkey]=${OPT[sshkey]:-$DEFAULT_SSHKEY}
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check_failure_action_config || return 1
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check_final_action_config || return 1
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check_fence_kdump_config || return 1
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check_ssh_config || return 1
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return 0
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}
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# get_pcs_cluster_modified_files <image timestamp>
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# return list of modified file for fence_kdump modified in Pacemaker cluster
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get_pcs_cluster_modified_files()
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{
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local time_stamp
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local modified_files
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local image_time
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is_generic_fence_kdump && return 1
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is_pcs_fence_kdump || return 1
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image_time=$1
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time_stamp=$(pcs cluster cib | xmllint --xpath 'string(/cib/@cib-last-written)' - | xargs -0 date +%s --date)
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if [[ -n $time_stamp ]] && [[ $time_stamp -gt $image_time ]]; then
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modified_files="cluster-cib"
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fi
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if [[ -f $FENCE_KDUMP_CONFIG_FILE ]]; then
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time_stamp=$(stat -c "%Y" "$FENCE_KDUMP_CONFIG_FILE")
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if [[ $time_stamp -gt $image_time ]]; then
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modified_files="$modified_files $FENCE_KDUMP_CONFIG_FILE"
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fi
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fi
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echo "$modified_files"
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}
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setup_initrd()
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{
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if ! prepare_kdump_bootinfo; then
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derror "failed to prepare for kdump bootinfo."
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return 1
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fi
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DEFAULT_INITRD_BAK="$KDUMP_BOOTDIR/.$(basename "$DEFAULT_INITRD").default"
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INITRD_CHECKSUM_LOCATION="$DEFAULT_INITRD_BAK.checksum"
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if [[ $DEFAULT_DUMP_MODE == "fadump" ]]; then
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TARGET_INITRD="$DEFAULT_INITRD"
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# backup initrd for reference before replacing it
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# with fadump aware initrd
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backup_default_initrd
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else
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TARGET_INITRD="$KDUMP_INITRD"
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# check if a backup of default initrd exists. If yes,
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# it signifies a switch from fadump mode. So, restore
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# the backed up default initrd.
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restore_default_initrd
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fi
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}
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check_files_modified()
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{
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local modified_files=""
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local image_time
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image_time=$(stat -c "%Y" "$TARGET_INITRD" 2> /dev/null)
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#also rebuild when Pacemaker cluster conf is changed and fence kdump is enabled.
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modified_files=$(get_pcs_cluster_modified_files "$image_time")
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EXTRA_BINS=${OPT[kdump_post]}
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CHECK_FILES=${OPT[kdump_pre]}
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HOOKS="/etc/kdump/post.d/ /etc/kdump/pre.d/"
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if [[ -d /etc/kdump/post.d ]]; then
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for file in /etc/kdump/post.d/*; do
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if [[ -x $file ]]; then
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POST_FILES="$POST_FILES $file"
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fi
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done
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fi
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if [[ -d /etc/kdump/pre.d ]]; then
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for file in /etc/kdump/pre.d/*; do
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if [[ -x $file ]]; then
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PRE_FILES="$PRE_FILES $file"
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fi
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done
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fi
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HOOKS="$HOOKS $POST_FILES $PRE_FILES"
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CORE_COLLECTOR=$(echo "${OPT[core_collector]}" | awk '{print $1}')
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CORE_COLLECTOR=$(type -P "$CORE_COLLECTOR")
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# POST_FILES and PRE_FILES are already checked against executable, need not to check again.
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EXTRA_BINS="$EXTRA_BINS $CHECK_FILES"
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CHECK_FILES=${OPT[extra_bins]}
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EXTRA_BINS="$EXTRA_BINS $CHECK_FILES"
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files="$KDUMP_CONFIG_FILE $KDUMP_KERNEL $EXTRA_BINS $CORE_COLLECTOR"
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[[ -e /etc/fstab ]] && files="$files /etc/fstab"
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# Check for any updated extra module
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EXTRA_MODULES="${OPT[extra_modules]}"
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if [[ -n $EXTRA_MODULES ]]; then
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if [[ -e /lib/modules/$KDUMP_KERNELVER/modules.dep ]]; then
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files="$files /lib/modules/$KDUMP_KERNELVER/modules.dep"
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fi
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for _module in $EXTRA_MODULES; do
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if _module_file="$(modinfo --set-version "$KDUMP_KERNELVER" --filename "$_module" 2> /dev/null)"; then
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files="$files $_module_file"
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for _dep_modules in $(modinfo -F depends "$_module" | tr ',' ' '); do
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files="$files $(modinfo --set-version "$KDUMP_KERNELVER" --filename "$_dep_modules" 2> /dev/null)"
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done
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else
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# If it's not a module nor builtin, give an error
|
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if ! (modprobe --set-version "$KDUMP_KERNELVER" --dry-run "$_module" &> /dev/null); then
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dwarn "Module $_module not found"
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fi
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fi
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done
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fi
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|
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# HOOKS is mandatory and need to check the modification time
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files="$files $HOOKS"
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is_lvm2_thinp_dump_target && files="$files $LVM_CONF"
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check_exist "$files" && check_executable "$EXTRA_BINS" || return 2
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|
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for file in $files; do
|
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if [[ -e $file ]]; then
|
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time_stamp=$(stat -c "%Y" "$file")
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if [[ $time_stamp -gt $image_time ]]; then
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modified_files="$modified_files $file"
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fi
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if [[ -L $file ]]; then
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file=$(readlink -m "$file")
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time_stamp=$(stat -c "%Y" "$file")
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if [[ $time_stamp -gt $image_time ]]; then
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modified_files="$modified_files $file"
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fi
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fi
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else
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dwarn "$file doesn't exist"
|
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fi
|
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done
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|
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if [[ -n $modified_files ]]; then
|
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dinfo "Detected change(s) in the following file(s): $modified_files"
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return 1
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fi
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|
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return 0
|
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}
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|
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check_drivers_modified()
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{
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local _target _new_drivers _old_drivers _module_name _module_filename
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|
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# If it's dump target is on block device, detect the block driver
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_target=$(get_block_dump_target)
|
|
if [[ -n $_target ]]; then
|
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_record_block_drivers()
|
|
{
|
|
local _drivers
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_drivers=$(udevadm info -a "/dev/block/$1" | sed -n 's/\s*DRIVERS=="\(\S\+\)"/\1/p')
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|
for _driver in $_drivers; do
|
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if ! [[ " $_new_drivers " == *" $_driver "* ]]; then
|
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_new_drivers="$_new_drivers $_driver"
|
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fi
|
|
done
|
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|
|
ddebug "MAJ:MIN=$1 drivers='$_drivers'"
|
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}
|
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check_block_and_slaves_all _record_block_drivers "$(get_maj_min "$_target")"
|
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fi
|
|
|
|
# Include watchdog drivers if watchdog module is not omitted
|
|
is_dracut_mod_omitted watchdog || _new_drivers+=" $(get_watchdog_drvs)"
|
|
[[ -z $_new_drivers ]] && return 0
|
|
|
|
if is_fadump_capable; then
|
|
_old_drivers="$(lsinitrd "$TARGET_INITRD" -f /usr/lib/dracut/fadump-kernel-modules.txt | tr '\n' ' ')"
|
|
else
|
|
_old_drivers="$(lsinitrd "$TARGET_INITRD" -f /usr/lib/dracut/hostonly-kernel-modules.txt | tr '\n' ' ')"
|
|
fi
|
|
|
|
ddebug "Modules required for kdump: '$_new_drivers'"
|
|
ddebug "Modules included in old initramfs: '$_old_drivers'"
|
|
for _driver in $_new_drivers; do
|
|
# Skip deprecated/invalid driver name or built-in module
|
|
_module_name=$(modinfo --set-version "$KDUMP_KERNELVER" -F name "$_driver" 2> /dev/null)
|
|
_module_filename=$(modinfo --set-version "$KDUMP_KERNELVER" -n "$_driver" 2> /dev/null)
|
|
if [[ -z $_module_name ]] || [[ -z $_module_filename ]] || [[ $_module_filename == *"(builtin)"* ]]; then
|
|
continue
|
|
fi
|
|
if ! [[ " $_old_drivers " == *" $_module_name "* ]]; then
|
|
dinfo "Detected change in block device driver, new loaded module: $_module_name"
|
|
return 1
|
|
fi
|
|
done
|
|
}
|
|
|
|
check_fs_modified()
|
|
{
|
|
local _old_dev _old_mntpoint _old_fstype
|
|
local _new_dev _new_mntpoint _new_fstype
|
|
local _target _dracut_args
|
|
|
|
# No need to check in case of mount target specified via "dracut_args".
|
|
if is_mount_in_dracut_args; then
|
|
return 0
|
|
fi
|
|
|
|
# No need to check in case of raw target.
|
|
# Currently we do not check also if ssh/nfs/virtiofs/thinp target is specified
|
|
if is_ssh_dump_target || is_nfs_dump_target || is_raw_dump_target ||
|
|
is_virtiofs_dump_target || is_lvm2_thinp_dump_target; then
|
|
return 0
|
|
fi
|
|
|
|
_target=$(get_block_dump_target)
|
|
_new_fstype=$(get_fs_type_from_target "$_target")
|
|
if [[ -z $_target ]] || [[ -z $_new_fstype ]]; then
|
|
derror "Dump target is invalid"
|
|
return 2
|
|
fi
|
|
|
|
ddebug "_target=$_target _new_fstype=$_new_fstype"
|
|
_new_dev=$(kdump_get_persistent_dev "$_target")
|
|
if [[ -z $_new_dev ]]; then
|
|
perror "Get persistent device name failed"
|
|
return 2
|
|
fi
|
|
|
|
_new_mntpoint="$(get_kdump_mntpoint_from_target "$_target")"
|
|
_dracut_args=$(lsinitrd "$TARGET_INITRD" -f usr/lib/dracut/build-parameter.txt)
|
|
if [[ -z $_dracut_args ]]; then
|
|
dwarn "Warning: No dracut arguments found in initrd"
|
|
return 0
|
|
fi
|
|
|
|
# if --mount argument present then match old and new target, mount
|
|
# point and file system. If any of them mismatches then rebuild
|
|
if echo "$_dracut_args" | grep -q -- "--mount"; then
|
|
# shellcheck disable=SC2046
|
|
set -- $(echo "$_dracut_args" | awk -F "--mount '" '{print $2}' | cut -d' ' -f1,2,3)
|
|
_old_dev=$1
|
|
_old_mntpoint=$2
|
|
_old_fstype=$3
|
|
[[ $_new_dev == "$_old_dev" && $_new_mntpoint == "$_old_mntpoint" && $_new_fstype == "$_old_fstype" ]] && return 0
|
|
# otherwise rebuild if target device is not a root device
|
|
else
|
|
[[ $_target == "$(get_root_fs_device)" ]] && return 0
|
|
fi
|
|
|
|
dinfo "Detected change in File System"
|
|
return 1
|
|
}
|
|
|
|
# returns 0 if system is not modified
|
|
# returns 1 if system is modified
|
|
# returns 2 if an error occurred
|
|
is_system_modified()
|
|
{
|
|
local ret
|
|
|
|
[[ -f $TARGET_INITRD ]] || return 1
|
|
|
|
# in case of fadump mode, check whether the default/target initrd is
|
|
# already built with dump capture capability
|
|
if [[ $DEFAULT_DUMP_MODE == "fadump" ]]; then
|
|
if ! lsinitrd -f $DRACUT_MODULES_FILE "$TARGET_INITRD" | grep -q -e ^kdumpbase$ -e ^zz-fadumpinit$; then
|
|
dinfo "Rebuild $TARGET_INITRD with dump capture support"
|
|
return 1
|
|
fi
|
|
fi
|
|
|
|
check_files_modified || return
|
|
check_fs_modified || return
|
|
check_drivers_modified
|
|
}
|
|
|
|
# need_initrd_rebuild - check whether the initrd needs to be rebuild
|
|
# Returns:
|
|
# 0 if does not need to be rebuild
|
|
# 1 if it needs to be rebuild
|
|
# 2 if an error occurred
|
|
need_initrd_rebuild()
|
|
{
|
|
local force_rebuild force_no_rebuild
|
|
|
|
force_no_rebuild=${OPT[force_no_rebuild]:-0}
|
|
if [[ $force_no_rebuild != "0" ]] && [[ $force_no_rebuild != "1" ]]; then
|
|
derror "Error: force_no_rebuild value is invalid"
|
|
return 2
|
|
fi
|
|
|
|
force_rebuild=${OPT[force_rebuild]:-0}
|
|
if [[ $force_rebuild != "0" ]] && [[ $force_rebuild != "1" ]]; then
|
|
derror "Error: force_rebuild value is invalid"
|
|
return 2
|
|
fi
|
|
|
|
if [[ $force_no_rebuild == "1" && $force_rebuild == "1" ]]; then
|
|
derror "Error: force_rebuild and force_no_rebuild are enabled simultaneously in kdump.conf"
|
|
return 2
|
|
fi
|
|
|
|
if [[ $force_no_rebuild == "1" ]]; then
|
|
return 0
|
|
fi
|
|
|
|
if [[ $force_rebuild == "1" ]]; then
|
|
dinfo "Force rebuild $TARGET_INITRD"
|
|
return 1
|
|
fi
|
|
|
|
if [[ ! -f $TARGET_INITRD ]]; then
|
|
dinfo "No kdump initial ramdisk found."
|
|
return 1
|
|
fi
|
|
|
|
is_system_modified
|
|
}
|
|
|
|
# On ppc64le LPARs, the keys trusted by firmware do not end up in
|
|
# .builtin_trusted_keys. So instead, add the key to the .ima keyring
|
|
function load_kdump_kernel_key()
|
|
{
|
|
# this is only called inside is_secure_boot_enforced,
|
|
# no need to retest
|
|
|
|
# this is only required if DT /ibm,secure-boot is a file.
|
|
# if it is a dir, we are on OpenPower and don't need this.
|
|
if ! [[ -f /proc/device-tree/ibm,secure-boot ]]; then
|
|
return
|
|
fi
|
|
|
|
KDUMP_KEY_ID=$(keyctl padd asymmetric kernelkey-$RANDOM %:.ima < "/usr/share/doc/kernel-keys/$KDUMP_KERNELVER/kernel-signing-ppc.cer")
|
|
}
|
|
|
|
# remove a previously loaded key. There's no real security implication
|
|
# to leaving it around, we choose to do this because it makes it easier
|
|
# to be idempotent and so as to reduce the potential for confusion.
|
|
function remove_kdump_kernel_key()
|
|
{
|
|
if [[ -z $KDUMP_KEY_ID ]]; then
|
|
return
|
|
fi
|
|
|
|
keyctl unlink "$KDUMP_KEY_ID" %:.ima
|
|
}
|
|
|
|
# Load the kdump kernel specified in /etc/sysconfig/kdump
|
|
# If none is specified, try to load a kdump kernel with the same version
|
|
# as the currently running kernel.
|
|
load_kdump()
|
|
{
|
|
local ret uki
|
|
|
|
KEXEC_ARGS=$(prepare_kexec_args "${KEXEC_ARGS}")
|
|
KDUMP_COMMANDLINE=$(prepare_cmdline "${KDUMP_COMMANDLINE}" "${KDUMP_COMMANDLINE_REMOVE}" "${KDUMP_COMMANDLINE_APPEND}")
|
|
# For secureboot enabled machines, use new kexec file based syscall.
|
|
# Old syscall will always fail as it does not have capability to
|
|
# to kernel signature verification.
|
|
if is_secure_boot_enforced; then
|
|
dinfo "Secure Boot is enabled. Using kexec file based syscall."
|
|
KEXEC_ARGS="$KEXEC_ARGS -s"
|
|
load_kdump_kernel_key
|
|
fi
|
|
|
|
if is_uki "$KDUMP_KERNEL"; then
|
|
uki=$KDUMP_KERNEL
|
|
KDUMP_KERNEL=$KDUMP_TMPDIR/vmlinuz
|
|
objcopy -O binary --only-section .linux "$uki" "$KDUMP_KERNEL"
|
|
sync -f "$KDUMP_KERNEL"
|
|
# Make sure the temp file has the correct SELinux label.
|
|
# Otherwise starting the kdump.service will fail.
|
|
chcon -t boot_t "$KDUMP_KERNEL"
|
|
fi
|
|
|
|
ddebug "$KEXEC $KEXEC_ARGS $standard_kexec_args --command-line=$KDUMP_COMMANDLINE --initrd=$TARGET_INITRD $KDUMP_KERNEL"
|
|
|
|
# The '12' represents an intermediate temporary file descriptor
|
|
# to store the standard error file descriptor '2', and later
|
|
# restore the error file descriptor with the file descriptor '12'
|
|
# and release it.
|
|
exec 12>&2
|
|
exec 2>> $KDUMP_LOG_PATH/kdump.log
|
|
chmod 600 $KDUMP_LOG_PATH/kdump.log
|
|
PS4='+ $(date "+%Y-%m-%d %H:%M:%S") ${BASH_SOURCE}@${LINENO}: '
|
|
set -x
|
|
|
|
# shellcheck disable=SC2086
|
|
$KEXEC $KEXEC_ARGS $standard_kexec_args \
|
|
--command-line="$KDUMP_COMMANDLINE" \
|
|
--initrd="$TARGET_INITRD" "$KDUMP_KERNEL"
|
|
|
|
ret=$?
|
|
set +x
|
|
exec 2>&12 12>&-
|
|
|
|
remove_kdump_kernel_key
|
|
|
|
if [[ $ret == 0 ]]; then
|
|
dinfo "kexec: loaded kdump kernel"
|
|
return 0
|
|
else
|
|
derror "kexec: failed to load kdump kernel"
|
|
return 1
|
|
fi
|
|
}
|
|
|
|
check_ssh_config()
|
|
{
|
|
local target
|
|
|
|
[[ "${OPT[_fstype]}" == ssh ]] || return 0
|
|
|
|
target=$(ssh -G "${OPT[_target]}" | sed -n -e "s/^hostname[[:space:]]\+\([^[:space:]]*\).*$/\1/p")
|
|
[[ ${OPT[_target]} =~ .*@.* ]] || return 1
|
|
if [[ ${OPT[_target]#*@} != "$target" ]]; then
|
|
derror "Invalid ssh destination ${OPT[_target]} provided."
|
|
return 1
|
|
fi
|
|
|
|
return 0
|
|
}
|
|
|
|
# ipv6 host address may takes a long time to be ready.
|
|
# Instead of checking against ipv6 address, we just check the network reachable
|
|
# by the return val of 'ssh'
|
|
check_and_wait_network_ready()
|
|
{
|
|
local start_time
|
|
local warn_once=1
|
|
local cur
|
|
local diff
|
|
local retval
|
|
local errmsg
|
|
|
|
[[ "${OPT[_fstype]}" == ssh ]] || return 0
|
|
|
|
start_time=$(date +%s)
|
|
while true; do
|
|
errmsg=$(ssh -i "${OPT[sshkey]}" -o BatchMode=yes "${OPT[_target]}" mkdir -p "${OPT[path]}" 2>&1)
|
|
retval=$?
|
|
|
|
# ssh exits with the exit status of the remote command or with 255 if an error occurred
|
|
if [[ $retval -eq 0 ]]; then
|
|
return 0
|
|
elif [[ $retval -ne 255 ]]; then
|
|
derror "Could not create ${OPT[_target]}:${OPT[path]}, you should check the privilege on server side"
|
|
return 1
|
|
fi
|
|
|
|
# if server removes the authorized_keys or, no /root/.ssh/kdump_id_rsa
|
|
ddebug "$errmsg"
|
|
if echo "$errmsg" | grep -q "Permission denied\|No such file or directory\|Host key verification failed"; then
|
|
derror "Could not create ${OPT[_target]}:${OPT[path]}, you probably need to run \"kdumpctl propagate\""
|
|
return 1
|
|
fi
|
|
|
|
if [[ $warn_once -eq 1 ]]; then
|
|
dwarn "Network dump target is not usable, waiting for it to be ready..."
|
|
warn_once=0
|
|
fi
|
|
|
|
cur=$(date +%s)
|
|
diff=$((cur - start_time))
|
|
# time out after 180s
|
|
if [[ $diff -gt 180 ]]; then
|
|
break
|
|
fi
|
|
sleep 1
|
|
done
|
|
|
|
dinfo "Could not create ${OPT[_target]}:${OPT[path]}, ipaddr is not ready yet. You should check network connection"
|
|
return 1
|
|
}
|
|
|
|
propagate_ssh_key()
|
|
{
|
|
local SSH_USER SSH_SERVER
|
|
|
|
parse_config || return 1
|
|
|
|
if [[ ${OPT[_fstype]} != ssh ]] ; then
|
|
derror "No ssh destination defined in $KDUMP_CONFIG_FILE."
|
|
derror "Please verify that $KDUMP_CONFIG_FILE contains 'ssh <user>@<host>' and that it is properly formatted."
|
|
exit 1
|
|
fi
|
|
|
|
local KEYFILE=${OPT[sshkey]}
|
|
|
|
#Check to see if we already created key, if not, create it.
|
|
if [[ -f $KEYFILE ]]; then
|
|
dinfo "Using existing keys..."
|
|
else
|
|
dinfo "Generating new ssh keys... "
|
|
/usr/bin/ssh-keygen -t rsa -f "$KEYFILE" -N "" &> /dev/null
|
|
dinfo "done."
|
|
fi
|
|
|
|
SSH_USER=${OPT[_target]%@*}
|
|
SSH_SERVER=${OPT[_target]#*@}
|
|
if ssh-copy-id -i "$KEYFILE" "${OPT[_target]}"; then
|
|
dinfo "$KEYFILE has been added to ~$SSH_USER/.ssh/authorized_keys on $SSH_SERVER"
|
|
return 0
|
|
else
|
|
derror "Failed to propagate ssh key, could not transfer $KEYFILE to $SSH_SERVER"
|
|
exit 1
|
|
fi
|
|
}
|
|
|
|
show_reserved_mem()
|
|
{
|
|
local mem
|
|
local mem_mb
|
|
|
|
mem=$(< /sys/kernel/kexec_crash_size)
|
|
mem_mb=$((mem / 1024 / 1024))
|
|
|
|
dinfo "Reserved ${mem_mb}MB memory for crash kernel"
|
|
}
|
|
|
|
save_raw()
|
|
{
|
|
local raw_target
|
|
|
|
[[ ${OPT[_fstype]} == raw ]] || return 0
|
|
|
|
raw_target=${OPT[_target]}
|
|
[[ -b $raw_target ]] || {
|
|
derror "raw partition $raw_target not found"
|
|
return 1
|
|
}
|
|
check_fs=$(lsblk --nodeps -npo FSTYPE "$raw_target")
|
|
if [[ $(echo "$check_fs" | wc -w) -ne 0 ]]; then
|
|
dwarn "Warning: Detected '$check_fs' signature on $raw_target, data loss is expected."
|
|
return 0
|
|
fi
|
|
|
|
coredir="${OPT[path]}/$(date +"%Y-%m-%d-%H:%M")"
|
|
mkdir -p "$coredir"
|
|
[[ -d $coredir ]] || {
|
|
derror "failed to create $coredir"
|
|
return 1
|
|
}
|
|
if makedumpfile -R "$coredir/vmcore" < "$raw_target" > /dev/null 2>&1; then
|
|
# dump found
|
|
dinfo "Dump saved to $coredir/vmcore"
|
|
# wipe makedumpfile header
|
|
dd if=/dev/zero of="$raw_target" bs=1b count=1 2> /dev/null
|
|
else
|
|
rm -rf "$coredir"
|
|
fi
|
|
|
|
return 0
|
|
}
|
|
|
|
is_local_target()
|
|
{
|
|
[[ ${OPT[_fstype]} =~ ^ext[234]|^xfs|^btrfs|^minix ]]
|
|
}
|
|
|
|
path_to_be_relabeled()
|
|
{
|
|
local _path _mnt="/" _rmnt
|
|
|
|
if is_user_configured_dump_target; then
|
|
if is_mount_in_dracut_args; then
|
|
return
|
|
fi
|
|
|
|
if is_local_target; then
|
|
_mnt=$(get_mntpoint_from_target "${OPT[_target]}")
|
|
if ! is_mounted "$_mnt"; then
|
|
return
|
|
fi
|
|
else
|
|
return
|
|
fi
|
|
fi
|
|
|
|
_path=$(get_save_path)
|
|
# if $_path is masked by other mount, we will not relabel it.
|
|
_rmnt=$(df "$_mnt/$_path" 2> /dev/null | tail -1 | awk '{ print $NF }')
|
|
if [[ $_rmnt == "$_mnt" ]]; then
|
|
echo "$_mnt/$_path"
|
|
fi
|
|
}
|
|
|
|
selinux_relabel()
|
|
{
|
|
local _path _i _attr
|
|
|
|
_path=$(path_to_be_relabeled)
|
|
if [[ -z $_path ]] || ! [[ -d $_path ]]; then
|
|
return
|
|
fi
|
|
|
|
while IFS= read -r -d '' _i; do
|
|
_attr=$(getfattr -m "security.selinux" "$_i" 2> /dev/null)
|
|
if [[ -z $_attr ]]; then
|
|
restorecon "$_i"
|
|
fi
|
|
done < <(find "$_path" -print0)
|
|
}
|
|
|
|
check_fence_kdump_config()
|
|
{
|
|
local hostname
|
|
local ipaddrs
|
|
local nodes
|
|
|
|
hostname=$(hostname)
|
|
ipaddrs=$(hostname -I)
|
|
nodes=${OPT[fence_kdump_nodes]}
|
|
|
|
for node in $nodes; do
|
|
if [[ $node == "$hostname" ]]; then
|
|
derror "Option fence_kdump_nodes cannot contain $hostname"
|
|
return 1
|
|
fi
|
|
# node can be ipaddr
|
|
if echo "$ipaddrs " | grep -q "$node "; then
|
|
derror "Option fence_kdump_nodes cannot contain $node"
|
|
return 1
|
|
fi
|
|
done
|
|
|
|
return 0
|
|
}
|
|
|
|
check_dump_feasibility()
|
|
{
|
|
if [[ $DEFAULT_DUMP_MODE == "fadump" ]]; then
|
|
return 0
|
|
fi
|
|
|
|
check_kdump_feasibility
|
|
}
|
|
|
|
start_fadump()
|
|
{
|
|
echo 1 > "$FADUMP_REGISTER_SYS_NODE"
|
|
if ! is_kernel_loaded "fadump"; then
|
|
derror "fadump: failed to register"
|
|
return 1
|
|
fi
|
|
|
|
dinfo "fadump: registered successfully"
|
|
return 0
|
|
}
|
|
|
|
start_dump()
|
|
{
|
|
if [[ $DEFAULT_DUMP_MODE == "fadump" ]]; then
|
|
start_fadump
|
|
else
|
|
load_kdump
|
|
fi
|
|
}
|
|
|
|
check_failure_action_config()
|
|
{
|
|
case "${OPT[failure_action]}" in
|
|
"" | reboot | halt | poweroff | shell | dump_to_rootfs)
|
|
return 0
|
|
;;
|
|
*)
|
|
dinfo $"Usage kdump.conf: failure_action {reboot|halt|poweroff|shell|dump_to_rootfs}"
|
|
return 1
|
|
;;
|
|
esac
|
|
}
|
|
|
|
check_final_action_config()
|
|
{
|
|
case "${OPT[final_action]}" in
|
|
"" | reboot | halt | poweroff)
|
|
return 0
|
|
;;
|
|
*)
|
|
dinfo $"Usage kdump.conf: final_action {reboot|halt|poweroff}"
|
|
return 1
|
|
;;
|
|
esac
|
|
}
|
|
|
|
start()
|
|
{
|
|
check_dump_feasibility || return
|
|
parse_config || return
|
|
|
|
if sestatus 2> /dev/null | grep -q "SELinux status.*enabled"; then
|
|
selinux_relabel
|
|
fi
|
|
|
|
save_raw || return
|
|
|
|
if [[ $DEFAULT_DUMP_MODE == "kdump" ]] && is_kernel_loaded "kdump"; then
|
|
dwarn "Kdump already running: [WARNING]"
|
|
return 0
|
|
fi
|
|
|
|
check_and_wait_network_ready || return
|
|
setup_initrd || return
|
|
need_initrd_rebuild
|
|
case "$?" in
|
|
0)
|
|
# Nothing to do
|
|
;;
|
|
1)
|
|
rebuild_initrd || return
|
|
;;
|
|
*)
|
|
return
|
|
;;
|
|
esac
|
|
start_dump || return
|
|
|
|
dinfo "Starting kdump: [OK]"
|
|
return 0
|
|
}
|
|
|
|
reload()
|
|
{
|
|
if ! is_kernel_loaded "$DEFAULT_DUMP_MODE"; then
|
|
dwarn "Kdump was not running: [WARNING]"
|
|
fi
|
|
|
|
if [[ $DEFAULT_DUMP_MODE == "fadump" ]]; then
|
|
reload_fadump
|
|
return
|
|
else
|
|
if ! stop_kdump; then
|
|
derror "Stopping kdump: [FAILED]"
|
|
return 1
|
|
fi
|
|
fi
|
|
|
|
dinfo "Stopping kdump: [OK]"
|
|
|
|
if ! setup_initrd; then
|
|
derror "Starting kdump: [FAILED]"
|
|
return 1
|
|
fi
|
|
|
|
if ! start_dump; then
|
|
derror "Starting kdump: [FAILED]"
|
|
return 1
|
|
fi
|
|
|
|
dinfo "Starting kdump: [OK]"
|
|
}
|
|
|
|
stop_fadump()
|
|
{
|
|
echo 0 > "$FADUMP_REGISTER_SYS_NODE"
|
|
if is_kernel_loaded "fadump"; then
|
|
derror "fadump: failed to unregister"
|
|
return 1
|
|
fi
|
|
|
|
dinfo "fadump: unregistered successfully"
|
|
return 0
|
|
}
|
|
|
|
stop_kdump()
|
|
{
|
|
if is_secure_boot_enforced; then
|
|
$KEXEC -s -p -u
|
|
else
|
|
$KEXEC -p -u
|
|
fi
|
|
|
|
# shellcheck disable=SC2181
|
|
if [[ $? != 0 ]]; then
|
|
derror "kexec: failed to unload kdump kernel"
|
|
return 1
|
|
fi
|
|
|
|
dinfo "kexec: unloaded kdump kernel"
|
|
return 0
|
|
}
|
|
|
|
reload_fadump()
|
|
{
|
|
if echo 1 > "$FADUMP_REGISTER_SYS_NODE"; then
|
|
dinfo "fadump: re-registered successfully"
|
|
return 0
|
|
else
|
|
# FADump could fail on older kernel where re-register
|
|
# support is not enabled. Try stop/start from userspace
|
|
# to handle such scenario.
|
|
if stop_fadump; then
|
|
start_fadump
|
|
return
|
|
fi
|
|
fi
|
|
|
|
return 1
|
|
}
|
|
|
|
stop()
|
|
{
|
|
if [[ $DEFAULT_DUMP_MODE == "fadump" ]]; then
|
|
stop_fadump || return
|
|
else
|
|
stop_kdump || return
|
|
fi
|
|
|
|
dinfo "Stopping kdump: [OK]"
|
|
return 0
|
|
}
|
|
|
|
rebuild()
|
|
{
|
|
parse_config || return 1
|
|
check_and_wait_network_ready || return 1
|
|
|
|
setup_initrd || return 1
|
|
|
|
rebuild_initrd
|
|
}
|
|
|
|
check_vmlinux()
|
|
{
|
|
# Use readelf to check if it's a valid ELF
|
|
readelf -h "$1" &> /dev/null || return 1
|
|
}
|
|
|
|
get_vmlinux_size()
|
|
{
|
|
local size=0 _msize
|
|
|
|
while read -r _msize; do
|
|
size=$((size + _msize))
|
|
done <<< "$(readelf -l -W "$1" | awk '/^ LOAD/{print $6}' 2> /dev/stderr)"
|
|
|
|
echo $size
|
|
}
|
|
|
|
try_decompress()
|
|
{
|
|
# The obscure use of the "tr" filter is to work around older versions of
|
|
# "grep" that report the byte offset of the line instead of the pattern.
|
|
|
|
# Try to find the header ($1) and decompress from here
|
|
for pos in $(tr "$1\n$2" "\n$2=" < "$4" | grep -abo "^$2"); do
|
|
if ! type -P "$3" > /dev/null; then
|
|
ddebug "Signiature detected but '$3' is missing, skip this decompressor"
|
|
break
|
|
fi
|
|
|
|
pos=${pos%%:*}
|
|
tail "-c+$pos" "$img" | $3 > "$5" 2> /dev/null
|
|
if check_vmlinux "$5"; then
|
|
ddebug "Kernel is extracted with '$3'"
|
|
return 0
|
|
fi
|
|
done
|
|
|
|
return 1
|
|
}
|
|
|
|
# Borrowed from linux/scripts/extract-vmlinux
|
|
get_kernel_size()
|
|
{
|
|
# Prepare temp files:
|
|
local tmp img=$1
|
|
|
|
tmp="$KDUMP_TMPDIR/vmlinux"
|
|
|
|
# Try to check if it's a vmlinux already
|
|
check_vmlinux "$img" && get_vmlinux_size "$img" && return 0
|
|
|
|
# That didn't work, so retry after decompression.
|
|
try_decompress '\037\213\010' xy gunzip "$img" "$tmp" ||
|
|
try_decompress '\3757zXZ\000' abcde unxz "$img" "$tmp" ||
|
|
try_decompress 'BZh' xy bunzip2 "$img" "$tmp" ||
|
|
try_decompress '\135\0\0\0' xxx unlzma "$img" "$tmp" ||
|
|
try_decompress '\211\114\132' xy 'lzop -d' "$img" "$tmp" ||
|
|
try_decompress '\002!L\030' xxx 'lz4 -d' "$img" "$tmp" ||
|
|
try_decompress '(\265/\375' xxx unzstd "$img" "$tmp"
|
|
|
|
# Finally check for uncompressed images or objects:
|
|
[[ $? -eq 0 ]] && get_vmlinux_size "$tmp" && return 0
|
|
|
|
# Fallback to use iomem
|
|
local _size=0 _seg
|
|
while read -r _seg; do
|
|
_size=$((_size + 0x${_seg#*-} - 0x${_seg%-*}))
|
|
done <<< "$(grep -E "Kernel (code|rodata|data|bss)" /proc/iomem | cut -d ":" -f 1)"
|
|
echo $_size
|
|
}
|
|
|
|
do_estimate()
|
|
{
|
|
local kdump_mods
|
|
local -A large_mods
|
|
local baseline
|
|
local kernel_size mod_size initrd_size baseline_size runtime_size reserved_size estimated_size recommended_size _cryptsetup_overhead
|
|
local size_mb=$((1024 * 1024))
|
|
|
|
setup_initrd
|
|
is_system_modified
|
|
case "$?" in
|
|
0)
|
|
# Nothing to do
|
|
;;
|
|
1)
|
|
rebuild_initrd || return
|
|
;;
|
|
*)
|
|
return
|
|
;;
|
|
esac
|
|
|
|
kdump_mods="$(lsinitrd "$TARGET_INITRD" -f /usr/lib/dracut/hostonly-kernel-modules.txt | tr '\n' ' ')"
|
|
baseline=$(kdump_get_arch_recommend_size)
|
|
if [[ ${baseline: -1} == "M" ]]; then
|
|
baseline=${baseline%M}
|
|
elif [[ ${baseline: -1} == "G" ]]; then
|
|
baseline=$((${baseline%G} * 1024))
|
|
elif [[ ${baseline: -1} == "T" ]]; then
|
|
baseline=$((${baseline%Y} * 1048576))
|
|
fi
|
|
|
|
# The default pre-reserved crashkernel value
|
|
baseline_size=$((baseline * size_mb))
|
|
# Current reserved crashkernel size
|
|
reserved_size=$(< /sys/kernel/kexec_crash_size)
|
|
# A pre-estimated value for userspace usage and kernel
|
|
# runtime allocation, 64M should good for most cases
|
|
runtime_size=$((64 * size_mb))
|
|
# Kernel image size
|
|
kernel_size=$(get_kernel_size "$KDUMP_KERNEL")
|
|
# Kdump initramfs size
|
|
initrd_size=$(du -b "$TARGET_INITRD" | awk '{print $1}')
|
|
# Kernel modules static size after loaded
|
|
mod_size=0
|
|
while read -r _name _size _; do
|
|
if [[ " $kdump_mods " != *" $_name "* ]]; then
|
|
continue
|
|
fi
|
|
mod_size=$((mod_size + _size))
|
|
|
|
# Mark module with static size larger than 2M as large module
|
|
if [[ $((_size / size_mb)) -ge 1 ]]; then
|
|
large_mods[$_name]=$_size
|
|
fi
|
|
done <<< "$(< /proc/modules)"
|
|
|
|
# Extra memory usage required for LUKS2 decryption
|
|
crypt_size=0
|
|
for _dev in $(get_all_kdump_crypt_dev); do
|
|
_crypt_info=$(cryptsetup luksDump "/dev/block/$_dev")
|
|
[[ $(echo "$_crypt_info" | sed -n "s/^Version:\s*\(.*\)/\1/p") == "2" ]] || continue
|
|
for _mem in $(echo "$_crypt_info" | sed -n "s/\sMemory:\s*\(.*\)/\1/p" | sort -n -r); do
|
|
crypt_size=$((crypt_size + _mem * 1024))
|
|
break
|
|
done
|
|
done
|
|
|
|
if [[ $crypt_size -ne 0 ]]; then
|
|
if [[ $(uname -m) == aarch64 ]]; then
|
|
_cryptsetup_overhead=50
|
|
else
|
|
_cryptsetup_overhead=20
|
|
fi
|
|
|
|
crypt_size=$((crypt_size + _cryptsetup_overhead * size_mb))
|
|
echo -e "Encrypted kdump target requires extra memory, assuming using the keyslot with maximum memory requirement\n"
|
|
fi
|
|
|
|
estimated_size=$((kernel_size + mod_size + initrd_size + runtime_size + crypt_size))
|
|
if [[ $baseline_size -gt $estimated_size ]]; then
|
|
recommended_size=$baseline_size
|
|
else
|
|
recommended_size=$estimated_size
|
|
fi
|
|
|
|
echo "Reserved crashkernel: $((reserved_size / size_mb))M"
|
|
echo "Recommended crashkernel: $((recommended_size / size_mb))M"
|
|
echo
|
|
echo "Kernel image size: $((kernel_size / size_mb))M"
|
|
echo "Kernel modules size: $((mod_size / size_mb))M"
|
|
echo "Initramfs size: $((initrd_size / size_mb))M"
|
|
echo "Runtime reservation: $((runtime_size / size_mb))M"
|
|
[[ $crypt_size -ne 0 ]] &&
|
|
echo "LUKS required size: $((crypt_size / size_mb))M"
|
|
echo -n "Large modules:"
|
|
if [[ ${#large_mods[@]} -eq 0 ]]; then
|
|
echo " <none>"
|
|
else
|
|
echo ""
|
|
for _mod in "${!large_mods[@]}"; do
|
|
echo " $_mod: ${large_mods[$_mod]}"
|
|
done
|
|
fi
|
|
|
|
if [[ $reserved_size -lt $recommended_size ]]; then
|
|
echo "WARNING: Current crashkernel size is lower than recommended size $((recommended_size / size_mb))M."
|
|
fi
|
|
}
|
|
|
|
get_default_crashkernel()
|
|
{
|
|
local _dump_mode=$1
|
|
|
|
kdump_get_arch_recommend_crashkernel "$_dump_mode"
|
|
}
|
|
|
|
# Read kernel cmdline parameter for a specific kernel
|
|
# $1: kernel path, DEFAULT or kernel path, ALL not accepted
|
|
# $2: kernel cmldine parameter
|
|
get_grub_kernel_boot_parameter()
|
|
{
|
|
local _kernel_path=$1 _para=$2
|
|
|
|
[[ $_kernel_path == ALL ]] && derror "kernel_path=ALL invalid for get_grub_kernel_boot_parameter" && return 1
|
|
grubby --info="$_kernel_path" | sed -En -e "/^args=.*$/{s/^.*(\s|\")${_para}=(\S*).*\"$/\2/p;q}"
|
|
}
|
|
|
|
# get dump mode by fadump value
|
|
# return
|
|
# - fadump, if fadump=on or fadump=nocma
|
|
# - kdump, if fadump=off or empty fadump, return kdump
|
|
# - error if otherwise
|
|
get_dump_mode_by_fadump_val()
|
|
{
|
|
local _fadump_val=$1
|
|
|
|
if [[ -z $_fadump_val ]] || [[ $_fadump_val == off ]]; then
|
|
echo -n kdump
|
|
elif [[ $_fadump_val == on ]] || [[ $_fadump_val == nocma ]]; then
|
|
echo -n fadump
|
|
else
|
|
derror "invalid fadump=$_fadump_val"
|
|
return 1
|
|
fi
|
|
}
|
|
|
|
# get dump mode of a specific kernel
|
|
# based on its fadump kernel cmdline parameter
|
|
get_dump_mode_by_kernel()
|
|
{
|
|
local _kernel_path=$1 _fadump_val _dump_mode
|
|
|
|
_fadump_val=$(get_grub_kernel_boot_parameter "$_kernel_path" fadump)
|
|
if _dump_mode=$(get_dump_mode_by_fadump_val "$_fadump_val"); then
|
|
echo -n "$_dump_mode"
|
|
else
|
|
derror "failed to get dump mode for kernel $_kernel_path"
|
|
exit
|
|
fi
|
|
}
|
|
|
|
_filter_grubby_kernel_str()
|
|
{
|
|
local _grubby_kernel_str=$1
|
|
echo -n "$_grubby_kernel_str" | sed -n -e 's/^kernel="\(.*\)"/\1/p'
|
|
}
|
|
|
|
_find_kernel_path_by_release()
|
|
{
|
|
local _release="$1" _grubby_kernel_str _kernel_path
|
|
|
|
# Insert '/' before '+' to cope with grep's EREs
|
|
_release=${_release//+/\\+}
|
|
_grubby_kernel_str=$(grubby --info ALL | grep -E "^kernel=.*$_release(\/\w+)?\"$")
|
|
_kernel_path=$(_filter_grubby_kernel_str "$_grubby_kernel_str")
|
|
if [[ -z $_kernel_path ]]; then
|
|
ddebug "kernel $_release doesn't exist"
|
|
return 1
|
|
fi
|
|
echo -n "$_kernel_path"
|
|
}
|
|
|
|
_get_current_running_kernel_path()
|
|
{
|
|
local _release _path
|
|
|
|
_release=$(uname -r)
|
|
if _path=$(_find_kernel_path_by_release "$_release"); then
|
|
echo -n "$_path"
|
|
else
|
|
return 1
|
|
fi
|
|
}
|
|
|
|
_update_kernel_cmdline()
|
|
{
|
|
local _kernel_path=$1 _crashkernel=$2 _dump_mode=$3 _fadump_val=$4
|
|
|
|
if is_ostree; then
|
|
if rpm-ostree kargs | grep -q "crashkernel="; then
|
|
rpm-ostree kargs --replace="crashkernel=$_crashkernel"
|
|
else
|
|
rpm-ostree kargs --append="crashkernel=$_crashkernel"
|
|
fi
|
|
else
|
|
grubby --args "crashkernel=$_crashkernel" --update-kernel "$_kernel_path"
|
|
if [[ $_dump_mode == kdump ]]; then
|
|
grubby --remove-args="fadump" --update-kernel "$_kernel_path"
|
|
else
|
|
grubby --args="fadump=$_fadump_val" --update-kernel "$_kernel_path"
|
|
fi
|
|
fi
|
|
|
|
# Don't use "[[ CONDITION ]] && COMMAND" which returns 1 under false CONDITION
|
|
if [[ -f /etc/zipl.conf ]]; then
|
|
zipl > /dev/null
|
|
fi
|
|
}
|
|
|
|
_valid_grubby_kernel_path()
|
|
{
|
|
[[ -n "$1" ]] && grubby --info="$1" > /dev/null 2>&1
|
|
}
|
|
|
|
# return all the kernel paths given a grubby kernel-path
|
|
#
|
|
# $1: kernel path accepted by grubby, e.g. DEFAULT, ALL,
|
|
# /boot/vmlinuz-`uname -r`
|
|
# return: kernel paths separated by space
|
|
_get_all_kernels_from_grubby()
|
|
{
|
|
local _kernels _line _kernel_path _grubby_kernel_path=$1
|
|
|
|
for _line in $(grubby --info "$_grubby_kernel_path" | grep "^kernel="); do
|
|
_kernel_path=$(_filter_grubby_kernel_str "$_line")
|
|
_kernels="$_kernels $_kernel_path"
|
|
done
|
|
echo -n "$_kernels"
|
|
}
|
|
|
|
GRUB_ETC_DEFAULT="/etc/default/grub"
|
|
# Update a kernel parameter in default grub conf
|
|
#
|
|
# If a value is specified, it will be inserted in the end. Otherwise it
|
|
# would remove given kernel parameter.
|
|
#
|
|
# Note this function doesn't address the following cases,
|
|
# 1. The kernel ignores everything on the command line after a '--'. So
|
|
# simply adding the new entry to the end will fail if the cmdline
|
|
# contains a --.
|
|
# 2. If the value for a parameter contains spaces it can be quoted using
|
|
# double quotes, for example param="value with spaces". This will
|
|
# break the [^[:space:]\"] regex for the value.
|
|
# 3. Dashes and underscores in the parameter name are equivalent. So
|
|
# some_parameter and some-parameter are identical.
|
|
# 4. Some parameters, e.g. efivar_ssdt, can be given multiple times.
|
|
# 5. Some kernel parameters, e.g. quiet, doesn't have value
|
|
#
|
|
# $1: the name of the kernel command line parameter
|
|
# $2: new value. If empty, given parameter would be removed
|
|
_update_kernel_arg_in_grub_etc_default()
|
|
{
|
|
local _para=$1 _val=$2 _para_val
|
|
|
|
if [[ $(uname -m) == s390x ]]; then
|
|
return
|
|
fi
|
|
|
|
if [[ -n $_val ]]; then
|
|
_para_val="$_para=$_val"
|
|
fi
|
|
|
|
# Update the command line /etc/default/grub, i.e.
|
|
# on the line that starts with 'GRUB_CMDLINE_LINUX=',
|
|
# 1) remove $para=$val if the it's the first arg
|
|
# 2) remove all occurences of $para=$val
|
|
# 3) insert $_para_val to end
|
|
# 4) remove duplicate spaces left over by 1) or 2) or 3)
|
|
# 5) remove space at the beginning of the string left over by 1) or 2) or 3)
|
|
# 6) remove space at the end of the string left over by 1) or 2) or 3)
|
|
sed -i -E "/^GRUB_CMDLINE_LINUX=/ {
|
|
s/\"${_para}=[^[:space:]\"]*/\"/g;
|
|
s/[[:space:]]+${_para}=[^[:space:]\"]*/ /g;
|
|
s/\"$/ ${_para_val}\"/
|
|
s/[[:space:]]+/ /g;
|
|
s/(\")[[:space:]]+/\1/g;
|
|
s/[[:space:]]+(\")/\1/g;
|
|
}" "$GRUB_ETC_DEFAULT"
|
|
}
|
|
|
|
# Read the kernel arg in default grub conf.
|
|
|
|
# Note reading a kernel parameter that doesn't have a value isn't supported.
|
|
#
|
|
# $1: the name of the kernel command line parameter
|
|
_read_kernel_arg_in_grub_etc_default()
|
|
{
|
|
sed -n -E "s/^GRUB_CMDLINE_LINUX=.*[[:space:]\"]${1}=([^[:space:]\"]*).*$/\1/p" "$GRUB_ETC_DEFAULT"
|
|
}
|
|
|
|
reset_crashkernel()
|
|
{
|
|
local _opt _val _dump_mode _fadump_val _reboot _grubby_kernel_path _kernel _kernels
|
|
local _old_crashkernel _new_crashkernel _new_dump_mode _crashkernel_changed
|
|
local _new_fadump_val _old_fadump_val _what_is_updated
|
|
|
|
for _opt in "$@"; do
|
|
case "$_opt" in
|
|
--fadump=*)
|
|
_val=${_opt#*=}
|
|
if _dump_mode=$(get_dump_mode_by_fadump_val $_val); then
|
|
_fadump_val=$_val
|
|
else
|
|
derror "failed to determine dump mode"
|
|
exit
|
|
fi
|
|
;;
|
|
--kernel=*)
|
|
_val=${_opt#*=}
|
|
if ! _valid_grubby_kernel_path $_val; then
|
|
derror "Invalid $_opt, please specify a valid kernel path, ALL or DEFAULT"
|
|
exit
|
|
fi
|
|
_grubby_kernel_path=$_val
|
|
;;
|
|
--reboot)
|
|
_reboot=yes
|
|
;;
|
|
*)
|
|
derror "$_opt not recognized"
|
|
exit 1
|
|
;;
|
|
esac
|
|
done
|
|
|
|
# 1. OSTree systems use "rpm-ostree kargs" instead of grubby to manage kernel command
|
|
# line. --kernel=ALL doesn't make sense for OStree.
|
|
# 2. We don't have any OSTree POWER systems so the dump mode is always kdump.
|
|
# 3. "rpm-ostree kargs" would prompt the user to reboot the system after
|
|
# modifying the kernel command line so there is no need for kexec-tools
|
|
# to repeat it.
|
|
if is_ostree; then
|
|
_old_crashkernel=$(rpm-ostree kargs | sed -n -E 's/.*(^|\s)crashkernel=(\S*).*/\2/p')
|
|
_new_dump_mode=kdump
|
|
_new_crashkernel=$(kdump_get_arch_recommend_crashkernel "$_new_dump_mode")
|
|
if [[ $_old_crashkernel != "$_new_crashkernel" ]]; then
|
|
_update_kernel_cmdline "" "$_new_crashkernel" "$_new_dump_mode" ""
|
|
if [[ $_reboot == yes ]]; then
|
|
systemctl reboot
|
|
fi
|
|
fi
|
|
return
|
|
fi
|
|
|
|
# For non-ppc64le systems, the dump mode is always kdump since only ppc64le
|
|
# has FADump.
|
|
if [[ -z $_dump_mode && $(uname -m) != ppc64le ]]; then
|
|
_dump_mode=kdump
|
|
_fadump_val=off
|
|
fi
|
|
|
|
# If the dump mode is determined, we can also know the default crashkernel value
|
|
if [[ -n $_dump_mode ]]; then
|
|
_crashkernel=$(kdump_get_arch_recommend_crashkernel "$_dump_mode")
|
|
fi
|
|
|
|
# If --kernel-path=ALL, update GRUB_CMDLINE_LINUX in /etc/default/grub.
|
|
#
|
|
# An exception case is when the ppc64le user doesn't specify the fadump value.
|
|
# In this case, the dump mode would be determined by parsing the kernel
|
|
# command line of the kernel(s) to be updated thus don't update GRUB_CMDLINE_LINUX.
|
|
#
|
|
# The following code has been simplified because of what has been done early,
|
|
# - set the dump mode as kdump for non-ppc64le cases
|
|
# - retrieved the default crashkernel value for given dump mode
|
|
if [[ $_grubby_kernel_path == ALL && -n $_dump_mode ]]; then
|
|
_update_kernel_arg_in_grub_etc_default crashkernel "$_crashkernel"
|
|
# remove the fadump if fadump is disabled
|
|
if [[ $_fadump_val == off ]]; then
|
|
_fadump_val=""
|
|
fi
|
|
_update_kernel_arg_in_grub_etc_default fadump "$_fadump_val"
|
|
fi
|
|
|
|
# If kernel-path not specified, either
|
|
# - use KDUMP_KERNELVER if it's defined
|
|
# - use current running kernel
|
|
if [[ -z $_grubby_kernel_path ]]; then
|
|
if [[ -z $KDUMP_KERNELVER ]] ||
|
|
! _kernel_path=$(_find_kernel_path_by_release "$KDUMP_KERNELVER"); then
|
|
if ! _kernel_path=$(_get_current_running_kernel_path); then
|
|
derror "no running kernel found"
|
|
exit 1
|
|
fi
|
|
fi
|
|
_kernels=$_kernel_path
|
|
else
|
|
_kernels=$(_get_all_kernels_from_grubby "$_grubby_kernel_path")
|
|
fi
|
|
|
|
for _kernel in $_kernels; do
|
|
if [[ -z $_dump_mode ]]; then
|
|
_new_dump_mode=$(get_dump_mode_by_kernel "$_kernel")
|
|
_new_crashkernel=$(kdump_get_arch_recommend_crashkernel "$_new_dump_mode")
|
|
_new_fadump_val=$(get_grub_kernel_boot_parameter "$_kernel" fadump)
|
|
else
|
|
_new_dump_mode=$_dump_mode
|
|
_new_crashkernel=$_crashkernel
|
|
_new_fadump_val=$_fadump_val
|
|
fi
|
|
|
|
_old_crashkernel=$(get_grub_kernel_boot_parameter "$_kernel" crashkernel)
|
|
_old_fadump_val=$(get_grub_kernel_boot_parameter "$_kernel" fadump)
|
|
if [[ $_old_crashkernel != "$_new_crashkernel" || $_old_fadump_val != "$_new_fadump_val" ]]; then
|
|
_update_kernel_cmdline "$_kernel" "$_new_crashkernel" "$_new_dump_mode" "$_new_fadump_val"
|
|
if [[ $_reboot != yes ]]; then
|
|
if [[ $_old_crashkernel != "$_new_crashkernel" ]]; then
|
|
_what_is_updated="Updated crashkernel=$_new_crashkernel"
|
|
else
|
|
# This case happens only when switching between fadump=on and fadump=nocma
|
|
_what_is_updated="Updated fadump=$_new_fadump_val"
|
|
fi
|
|
dwarn "$_what_is_updated for kernel=$_kernel. Please reboot the system for the change to take effect."
|
|
fi
|
|
_crashkernel_changed=yes
|
|
fi
|
|
done
|
|
|
|
if [[ $_reboot == yes && $_crashkernel_changed == yes ]]; then
|
|
reboot
|
|
fi
|
|
}
|
|
|
|
GRUB_CFG=/boot/grub2/grub.cfg
|
|
_is_bootloader_installed()
|
|
{
|
|
if [[ $(uname -m) == s390x ]]; then
|
|
test -f /etc/zipl.conf
|
|
else
|
|
test -f "$GRUB_CFG"
|
|
fi
|
|
}
|
|
|
|
_update_crashkernel()
|
|
{
|
|
local _kernel _kver _dump_mode _old_default_crashkernel _new_default_crashkernel _fadump_val _msg
|
|
|
|
_kernel=$1
|
|
_dump_mode=$(get_dump_mode_by_kernel "$_kernel")
|
|
_old_default_crashkernel=$(get_grub_kernel_boot_parameter "$_kernel" crashkernel)
|
|
_kver=$(parse_kver_from_path "$_kernel")
|
|
# The second argument is for the case of aarch64, where installing a 64k variant on a 4k kernel, or vice versa
|
|
_new_default_crashkernel=$(kdump_get_arch_recommend_crashkernel "$_dump_mode" "$_kver")
|
|
if [[ $_old_default_crashkernel != "$_new_default_crashkernel" ]]; then
|
|
_fadump_val=$(get_grub_kernel_boot_parameter "$_kernel" fadump)
|
|
if _update_kernel_cmdline "$_kernel" "$_new_default_crashkernel" "$_dump_mode" "$_fadump_val"; then
|
|
_msg="For kernel=$_kernel, crashkernel=$_new_default_crashkernel now. Please reboot the system for the change to take effet."
|
|
_msg+=" Note if you don't want kexec-tools to manage the crashkernel kernel parameter, please set auto_reset_crashkernel=no in /etc/kdump.conf."
|
|
dinfo "$_msg"
|
|
fi
|
|
fi
|
|
}
|
|
|
|
|
|
# shellcheck disable=SC2154 # false positive when dereferencing an array
|
|
reset_crashkernel_after_update()
|
|
{
|
|
local _kernel
|
|
|
|
if ! _is_bootloader_installed; then
|
|
return
|
|
fi
|
|
|
|
for _kernel in $(_get_all_kernels_from_grubby ALL); do
|
|
_update_crashkernel "$_kernel"
|
|
done
|
|
}
|
|
|
|
# read the value of an environ variable from given environ file path
|
|
#
|
|
# The environment variable entries in /proc/[pid]/environ are separated
|
|
# by null bytes instead of by spaces.
|
|
#
|
|
# $1: environment variable
|
|
# $2: environ file path
|
|
read_proc_environ_var()
|
|
{
|
|
local _var=$1 _environ_path=$2
|
|
sed -n -E "s/.*(^|\x00)${_var}=([^\x00]*).*/\2/p" < "$_environ_path"
|
|
}
|
|
|
|
_OSBUILD_ENVIRON_PATH='/proc/1/environ'
|
|
_is_osbuild()
|
|
{
|
|
[[ $(read_proc_environ_var container "$_OSBUILD_ENVIRON_PATH") == bwrap-osbuild ]]
|
|
}
|
|
|
|
reset_crashkernel_for_installed_kernel()
|
|
{
|
|
local _installed_kernel
|
|
|
|
# During package install, only try to reset crashkernel for osbuild
|
|
# thus to avoid calling grubby when installing os via anaconda
|
|
if ! _is_bootloader_installed && ! _is_osbuild; then
|
|
return
|
|
fi
|
|
|
|
if ! _installed_kernel=$(_find_kernel_path_by_release "$1"); then
|
|
exit 1
|
|
fi
|
|
|
|
if _is_osbuild; then
|
|
if ! grep -qs crashkernel= /etc/kernel/cmdline; then
|
|
reset_crashkernel "--kernel=$_installed_kernel"
|
|
fi
|
|
return
|
|
fi
|
|
|
|
_update_crashkernel "$_installed_kernel"
|
|
}
|
|
|
|
main()
|
|
{
|
|
# Determine if the dump mode is kdump or fadump
|
|
determine_dump_mode
|
|
|
|
case "$1" in
|
|
start)
|
|
if ! start; then
|
|
derror "Starting kdump: [FAILED]"
|
|
exit 1
|
|
fi
|
|
;;
|
|
stop)
|
|
if ! stop; then
|
|
derror "Stopping kdump: [FAILED]"
|
|
exit 1
|
|
fi
|
|
;;
|
|
status)
|
|
EXIT_CODE=0
|
|
is_kernel_loaded "$DEFAULT_DUMP_MODE"
|
|
case "$?" in
|
|
0)
|
|
dinfo "Kdump is operational"
|
|
EXIT_CODE=0
|
|
;;
|
|
1)
|
|
dinfo "Kdump is not operational"
|
|
EXIT_CODE=3
|
|
;;
|
|
esac
|
|
exit $EXIT_CODE
|
|
;;
|
|
reload)
|
|
reload
|
|
;;
|
|
restart)
|
|
if ! stop; then
|
|
derror "Stopping kdump: [FAILED]"
|
|
exit 1
|
|
fi
|
|
if ! start; then
|
|
derror "Starting kdump: [FAILED]"
|
|
exit 1
|
|
fi
|
|
;;
|
|
rebuild)
|
|
rebuild
|
|
;;
|
|
condrestart) ;;
|
|
|
|
propagate)
|
|
propagate_ssh_key
|
|
;;
|
|
showmem)
|
|
show_reserved_mem
|
|
;;
|
|
estimate)
|
|
do_estimate
|
|
;;
|
|
get-default-crashkernel)
|
|
get_default_crashkernel "$2"
|
|
;;
|
|
reset-crashkernel)
|
|
shift
|
|
reset_crashkernel "$@"
|
|
;;
|
|
_reset-crashkernel-after-update)
|
|
if [[ $(kdump_get_conf_val auto_reset_crashkernel) != no ]]; then
|
|
reset_crashkernel_after_update
|
|
fi
|
|
;;
|
|
_reset-crashkernel-for-installed_kernel)
|
|
if [[ $(kdump_get_conf_val auto_reset_crashkernel) != no ]]; then
|
|
reset_crashkernel_for_installed_kernel "$2"
|
|
fi
|
|
;;
|
|
*)
|
|
dinfo $"Usage: $0 {estimate|start|stop|status|restart|reload|rebuild|reset-crashkernel|propagate|showmem}"
|
|
exit 1
|
|
;;
|
|
esac
|
|
}
|
|
|
|
if [[ ${__SOURCED__:+x} ]]; then
|
|
return
|
|
fi
|
|
|
|
if [[ ! -f $KDUMP_CONFIG_FILE ]]; then
|
|
derror "Error: No kdump config file found!"
|
|
exit 1
|
|
fi
|
|
|
|
# Other kdumpctl instances will block in queue, until this one exits
|
|
single_instance_lock
|
|
|
|
# To avoid fd 9 leaking, we invoke a subshell, close fd 9 and call main.
|
|
# So that fd isn't leaking when main is invoking a subshell.
|
|
(
|
|
exec 9<&-
|
|
main "$@"
|
|
)
|