1324 lines
31 KiB
Bash
Executable File
1324 lines
31 KiB
Bash
Executable File
#!/bin/bash
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KEXEC=/sbin/kexec
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KDUMP_KERNELVER=""
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KDUMP_COMMANDLINE=""
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KEXEC_ARGS=""
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KDUMP_CONFIG_FILE="/etc/kdump.conf"
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MKDUMPRD="/sbin/mkdumprd -f"
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DRACUT_MODULES_FILE="/usr/lib/dracut/modules.txt"
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SAVE_PATH=/var/crash
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SSH_KEY_LOCATION="/root/.ssh/kdump_id_rsa"
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INITRD_CHECKSUM_LOCATION="/boot/.fadump_initrd_checksum"
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DUMP_TARGET=""
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DEFAULT_INITRD=""
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DEFAULT_INITRD_BAK=""
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TARGET_INITRD=""
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FADUMP_REGISTER_SYS_NODE="/sys/kernel/fadump_registered"
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#kdump shall be the default dump mode
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DEFAULT_DUMP_MODE="kdump"
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image_time=0
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. /lib/kdump/kdump-lib.sh
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standard_kexec_args="-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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if [ -f /etc/sysconfig/kdump ]; then
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. /etc/sysconfig/kdump
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fi
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single_instance_lock()
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{
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local rc timeout=5
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exec 9>/var/lock/kdump
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if [ $? -ne 0 ]; then
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echo "Create file lock failed"
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exit 1
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fi
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flock -n 9
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rc=$?
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while [ $rc -ne 0 ]; do
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echo "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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echo "Dump mode is fadump"
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DEFAULT_DUMP_MODE="fadump"
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fi
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}
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# remove_cmdline_param <kernel cmdline> <param1> [<param2>] ... [<paramN>]
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# Remove a list of kernel parameters from a given kernel cmdline and print the result.
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# For each "arg" in the removing params list, "arg" and "arg=xxx" will be removed if exists.
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remove_cmdline_param()
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{
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local cmdline=$1
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shift
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for arg in $@; do
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cmdline=`echo $cmdline | \
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sed -e "s/\b$arg=[^ ]*//g" \
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-e "s/^$arg\b//g" \
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-e "s/[[:space:]]$arg\b//g" \
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-e "s/\s\+/ /g"`
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done
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echo $cmdline
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}
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#
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# This function returns the "apicid" of the boot
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# cpu (cpu 0) if present.
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#
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get_bootcpu_apicid()
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{
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awk ' \
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BEGIN { CPU = "-1"; } \
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$1=="processor" && $2==":" { CPU = $NF; } \
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CPU=="0" && /^apicid/ { print $NF; } \
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' \
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/proc/cpuinfo
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}
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#
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# This function appends argument "$2=$3" to string ($1) if not already present.
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#
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append_cmdline()
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{
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local cmdline=$1
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local newstr=${cmdline/$2/""}
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# unchanged str implies argument wasn't there
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if [ "$cmdline" == "$newstr" ]; then
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cmdline="${cmdline} ${2}=${3}"
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fi
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echo $cmdline
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}
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# This function performs a series of edits on the command line.
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# Store the final result in global $KDUMP_COMMANDLINE.
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prepare_cmdline()
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{
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local cmdline id
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if [ -z "$KDUMP_COMMANDLINE" ]; then
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cmdline=$(cat /proc/cmdline)
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else
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cmdline=${KDUMP_COMMANDLINE}
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fi
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# These params should always be removed
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cmdline=$(remove_cmdline_param "$cmdline" crashkernel panic_on_warn)
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# These params can be removed configurably
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cmdline=$(remove_cmdline_param "$cmdline" ${KDUMP_COMMANDLINE_REMOVE})
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# Always remove "root=X", as we now explicitly generate all kinds
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# of dump target mount information including root fs.
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#
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# We do this before KDUMP_COMMANDLINE_APPEND, if one really cares
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# about it(e.g. for debug purpose), then can pass "root=X" using
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# KDUMP_COMMANDLINE_APPEND.
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cmdline=$(remove_cmdline_param "$cmdline" root)
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# With the help of "--hostonly-cmdline", we can avoid some interitage.
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cmdline=$(remove_cmdline_param "$cmdline" rd.lvm.lv rd.luks.uuid rd.dm.uuid rd.md.uuid fcoe)
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# Remove netroot, rd.iscsi.initiator and iscsi_initiator since
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# we get duplicate entries for the same in case iscsi code adds
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# it as well.
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cmdline=$(remove_cmdline_param "$cmdline" netroot rd.iscsi.initiator iscsi_initiator)
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cmdline="${cmdline} ${KDUMP_COMMANDLINE_APPEND}"
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id=$(get_bootcpu_apicid)
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if [ ! -z ${id} ] ; then
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cmdline=$(append_cmdline "${cmdline}" disable_cpu_apicid ${id})
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fi
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KDUMP_COMMANDLINE=$cmdline
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}
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save_core()
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{
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coredir="/var/crash/`date +"%Y-%m-%d-%H:%M"`"
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mkdir -p $coredir
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cp --sparse=always /proc/vmcore $coredir/vmcore-incomplete
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if [ $? == 0 ]; then
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mv $coredir/vmcore-incomplete $coredir/vmcore
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echo "saved a vmcore to $coredir"
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else
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echo "failed to save a vmcore to $coredir" >&2
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fi
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# pass the dmesg to Abrt tool if exists, in order
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# to collect the kernel oops message.
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# https://fedorahosted.org/abrt/
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if [ -x /usr/bin/dumpoops ]; then
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makedumpfile --dump-dmesg $coredir/vmcore $coredir/dmesg >/dev/null 2>&1
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dumpoops -d $coredir/dmesg >/dev/null 2>&1
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if [ $? == 0 ]; then
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echo "kernel oops has been collected by abrt tool"
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fi
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fi
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}
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rebuild_fadump_initrd()
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{
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local target_initrd_tmp
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# this file tells the initrd is fadump enabled
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touch /tmp/fadump.initramfs
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target_initrd_tmp="$TARGET_INITRD.tmp"
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$MKDUMPRD $target_initrd_tmp --rebuild $TARGET_INITRD --kver $kdump_kver \
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-i /tmp/fadump.initramfs /etc/fadump.initramfs
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if [ $? != 0 ]; then
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echo "mkdumprd: failed to rebuild initrd with fadump support" >&2
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rm -f /tmp/fadump.initramfs
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return 1
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fi
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rm -f /tmp/fadump.initramfs
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# updating fadump initrd
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mv $target_initrd_tmp $TARGET_INITRD
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sync
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return 0
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}
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rebuild_kdump_initrd()
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{
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$MKDUMPRD $TARGET_INITRD $kdump_kver
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if [ $? != 0 ]; then
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echo "mkdumprd: failed to make kdump initrd" >&2
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return 1
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fi
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return 0
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}
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rebuild_initrd()
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{
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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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return $?
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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 $1; do
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if [ ! -f "$file" ]; then
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echo -n "Error: $file not found."; echo
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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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echo -n "Error: $file is not executable."; echo
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return 1
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fi
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done
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}
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backup_default_initrd()
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{
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if [ ! -f "$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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echo "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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cp $DEFAULT_INITRD $DEFAULT_INITRD_BAK
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if [ $? -ne 0 ]; then
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echo "WARNING: failed to backup $DEFAULT_INITRD."
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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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# 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=`cat $INITRD_CHECKSUM_LOCATION | awk '{ print $1 }'`
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if [ "$default_checksum" != "$backup_checksum" ]; then
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echo "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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mv $DEFAULT_INITRD_BAK $DEFAULT_INITRD
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if [[ $? -eq 0 ]]; then
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echo -n "Restoring original initrd as fadump mode "
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echo "is disabled."
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sync
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fi
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fi
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fi
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}
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check_config()
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{
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local nr
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nr=$(awk 'BEGIN{cnt=0} /^raw|^ssh[[:blank:]]|^nfs|^ext[234]|^xfs|^btrfs|^minix|^dracut_args .*\-\-mount/{cnt++} END{print cnt}' $KDUMP_CONFIG_FILE)
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[ $nr -gt 1 ] && {
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echo "More than one dump targets specified."
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return 1
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}
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nr=$(grep "^dracut_args .*\-\-mount" $KDUMP_CONFIG_FILE | grep -o "\-\-mount" | wc -l)
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[ $nr -gt 1 ] && {
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echo "Multiple mount targets specified in one \"dracut_args\"."
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return 1
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}
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# Check if we have any leading spaces (or tabs) before the
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# variable name in the kdump conf file
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if grep -E -q '^[[:blank:]]+[a-z]' $KDUMP_CONFIG_FILE; then
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echo "No whitespaces are allowed before a kdump option name in $KDUMP_CONFIG_FILE"
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return 1
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fi
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while read config_opt config_val; do
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case "$config_opt" in
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\#* | "")
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;;
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raw|ext2|ext3|ext4|minix|btrfs|xfs|nfs|ssh|sshkey|path|core_collector|kdump_post|kdump_pre|extra_bins|extra_modules|default|force_rebuild|force_no_rebuild|dracut_args|fence_kdump_args|fence_kdump_nodes)
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# remove inline comments after the end of a directive.
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config_val=$(strip_comments $config_val)
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[ -z "$config_val" ] && {
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echo "Invalid kdump config value for option $config_opt."
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return 1;
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}
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;;
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net|options|link_delay|disk_timeout|debug_mem_level|blacklist)
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echo "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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echo "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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done < $KDUMP_CONFIG_FILE
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check_default_config || return 1
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check_fence_kdump_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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is_generic_fence_kdump && return 1
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is_pcs_fence_kdump || return 1
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time_stamp=`pcs cluster cib | xmllint --xpath 'string(/cib/@cib-last-written)' - | \
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xargs -0 date +%s --date`
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if [ -n $time_stamp -a $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 $modified_files
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}
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check_boot_dir()
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{
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#If user specify a boot dir for kdump kernel, let's use it. Otherwise
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#check whether it's a atomic host. If yes parse the subdirectory under
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#/boot; If not just find it under /boot.
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[ -n "$KDUMP_BOOTDIR" ] && return
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if ! is_atomic || [ "$(uname -m)" = "s390x" ]; then
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KDUMP_BOOTDIR="/boot"
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else
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eval $(cat /proc/cmdline| grep "BOOT_IMAGE" | cut -d' ' -f1)
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KDUMP_BOOTDIR="/boot"$(dirname $BOOT_IMAGE)
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fi
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}
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setup_initrd()
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{
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DEFAULT_INITRD="${KDUMP_BOOTDIR}/initramfs-`uname -r`.img"
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DEFAULT_INITRD_BAK="${KDUMP_BOOTDIR}/.initramfs-`uname -r`.img.default"
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if [ $DEFAULT_DUMP_MODE == "fadump" ]; then
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TARGET_INITRD="$DEFAULT_INITRD"
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if [ ! -s "$TARGET_INITRD" ]; then
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echo "Error: No initrd found to rebuild!"
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return 1
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fi
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else
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TARGET_INITRD="${KDUMP_BOOTDIR}/initramfs-${kdump_kver}kdump.img"
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fi
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}
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check_files_modified()
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{
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local modified_files=""
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#also rebuild when Pacemaker cluster conf is changed and fence kdump is enabled.
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modified_files=$(get_pcs_cluster_modified_files)
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EXTRA_BINS=`grep ^kdump_post $KDUMP_CONFIG_FILE | cut -d\ -f2`
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CHECK_FILES=`grep ^kdump_pre $KDUMP_CONFIG_FILE | cut -d\ -f2`
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CORE_COLLECTOR=`grep ^core_collector $KDUMP_CONFIG_FILE | cut -d\ -f2`
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CORE_COLLECTOR=`type -P $CORE_COLLECTOR`
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EXTRA_BINS="$EXTRA_BINS $CHECK_FILES"
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CHECK_FILES=`grep ^extra_bins $KDUMP_CONFIG_FILE | cut -d\ -f2-`
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EXTRA_BINS="$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_exist "$files" && check_executable "$EXTRA_BINS"
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[ $? -ne 0 ] && return 2
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for file in $files; do
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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 $file"
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fi
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done
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if [ -n "$modified_files" ]; then
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echo "Detected change(s) in the following file(s):"
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echo -n " "; echo "$modified_files" | sed 's/\s/\n /g'
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return 1
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fi
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return 0
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}
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check_dump_fs_modified()
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{
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local _old_dev _old_mntpoint _old_fstype
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local _new_dev _new_mntpoint _new_fstype
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local _target _path _dracut_args
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# No need to check in case of mount target specified via "dracut_args".
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if is_mount_in_dracut_args; then
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return 0
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fi
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# No need to check in case of raw target.
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# Currently we do not check also if ssh/nfs target is specified
|
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if is_ssh_dump_target || is_nfs_dump_target || is_raw_dump_target; then
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return 0
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fi
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_target=$(get_user_configured_dump_disk)
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if [[ -n "$_target" ]]; then
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_target=$(to_dev_name $_target)
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_new_fstype=$(blkid $_target | awk -F"TYPE=" '{print $2}' | cut -d '"' -f 2)
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else
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_path=$(get_save_path)
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set -- $(df -T $_path 2>/dev/null | tail -1 | awk '{ print $1, $2}')
|
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_target=$(to_dev_name $1)
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_new_fstype=$2
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if [[ -z "$_target" || -z "$_new_fstype" ]];then
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echo "Dump path $_path does not exist"
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return 2
|
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fi
|
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fi
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if [[ $(expr substr $_new_fstype 1 3) = "nfs" ]];then
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_new_dev=$_target
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else
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_new_dev=$(kdump_get_persistent_dev $_target $_new_fstype)
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fi
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if ! findmnt $_target >/dev/null; then
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echo "Dump target $_target is probably not mounted."
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return 2
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fi
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if [[ "$_target" = "$(get_root_fs_device)" ]]; then
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_new_mntpoint="/sysroot"
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else
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_new_mntpoint="/kdumproot/$(get_mntpoint_from_target $_target)"
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fi
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|
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_dracut_args=$(lsinitrd $TARGET_INITRD -f usr/lib/dracut/build-parameter.txt)
|
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if [[ -z "$_dracut_args" ]];then
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echo "Warning: No dracut arguments found in initrd"
|
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return 0
|
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fi
|
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|
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# if --mount argument present then match old and new target, mount
|
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# point and file system. If any of them mismatches then rebuild
|
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echo $_dracut_args | grep "\-\-mount" &> /dev/null
|
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if [[ $? -eq 0 ]];then
|
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set -- $(echo $_dracut_args | awk -F "--mount '" '{print $2}' | cut -d' ' -f1,2,3)
|
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_old_dev=$1
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_old_mntpoint=$2
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_old_fstype=$3
|
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[[ $_new_dev = $_old_dev && $_new_mntpoint = $_old_mntpoint && $_new_fstype = $_old_fstype ]] && return 0
|
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# otherwise rebuild if target device is not a root device
|
|
else
|
|
[[ "$_target" = "$(get_root_fs_device)" ]] && return 0
|
|
fi
|
|
|
|
echo "Detected change in File System"
|
|
return 1
|
|
}
|
|
|
|
check_wdt_modified()
|
|
{
|
|
local -A _drivers
|
|
local _alldrivers _active _wdtdrv _wdtppath _dir
|
|
local wd_old wd_new
|
|
|
|
is_wdt_mod_omitted
|
|
[[ $? -eq 0 ]] && return 0
|
|
[[ -d /sys/class/watchdog/ ]] || return 0
|
|
|
|
# Copied logic from dracut 04watchdog/module-setup.sh::installkernel()
|
|
for _dir in /sys/class/watchdog/*; do
|
|
[[ -d "$_dir" ]] || continue
|
|
[[ -f "$_dir/state" ]] || continue
|
|
_active=$(< "$_dir/state")
|
|
[[ "$_active" = "active" ]] || continue
|
|
# device/modalias will return driver of this device
|
|
_wdtdrv=$(< "$_dir/device/modalias")
|
|
# There can be more than one module represented by same
|
|
# modalias. Currently load all of them.
|
|
# TODO: Need to find a way to avoid any unwanted module
|
|
# represented by modalias
|
|
_wdtdrv=$(modprobe --set-version "$kdump_kver" -R $_wdtdrv 2>/dev/null)
|
|
if [[ $_wdtdrv ]]; then
|
|
for i in $_wdtdrv; do
|
|
_drivers[$i]=1
|
|
done
|
|
fi
|
|
# however in some cases, we also need to check that if there is
|
|
# a specific driver for the parent bus/device. In such cases
|
|
# we also need to enable driver for parent bus/device.
|
|
_wdtppath=$(readlink -f "$_dir/device")
|
|
while [[ -d "$_wdtppath" ]] && [[ "$_wdtppath" != "/sys" ]]; do
|
|
_wdtppath=$(readlink -f "$_wdtppath/..")
|
|
[[ -f "$_wdtppath/modalias" ]] || continue
|
|
|
|
_wdtdrv=$(< "$_wdtppath/modalias")
|
|
_wdtdrv=$(modprobe --set-version "$kdump_kver" -R $_wdtdrv 2>/dev/null)
|
|
if [[ $_wdtdrv ]]; then
|
|
for i in $_wdtdrv; do
|
|
_drivers[$i]=1
|
|
done
|
|
fi
|
|
done
|
|
done
|
|
|
|
# ensure that watchdog module is loaded as early as possible
|
|
_alldrivers="${!_drivers[*]}"
|
|
[[ $_alldrivers ]] && wd_new="rd.driver.pre=${_alldrivers// /,}"
|
|
wd_old=$(lsinitrd $TARGET_INITRD -f etc/cmdline.d/00-watchdog.conf)
|
|
|
|
[[ "$wd_old" = "$wd_new" ]] && return 0
|
|
|
|
return 1
|
|
}
|
|
|
|
check_kmodules_modified()
|
|
{
|
|
# always sort again to avoid LANG/LC inconsistent problem
|
|
local _old_modules="$(lsinitrd $TARGET_INITRD -f /usr/lib/dracut/loaded-kernel-modules.txt | sort)"
|
|
local _new_modules="$(get_loaded_kernel_modules | sort)"
|
|
|
|
[[ -z $_old_modules ]] && echo "Warning: Previous loaded kernel module list is absent or empty"
|
|
|
|
local _added_modules=$(comm -13 <(echo "$_old_modules") <(echo "$_new_modules"))
|
|
local _dropped_modules=$(comm -23 <(echo "$_old_modules") <(echo "$_new_modules"))
|
|
|
|
if [ "$_old_modules" != "$_new_modules" ]; then
|
|
echo "Detected change(s) of loaded kernel modules list:"
|
|
[[ -n $_added_modules ]] && for _module in $_added_modules; do
|
|
echo " +$_module"
|
|
done
|
|
[[ -n $_dropped_modules ]] && for _module in $_dropped_modules; do
|
|
echo " -$_module"
|
|
done
|
|
return 1
|
|
fi
|
|
|
|
return 0
|
|
}
|
|
|
|
# returns 0 if system is not modified
|
|
# returns 1 if system is modified
|
|
# returns 2 if system modification is invalid
|
|
check_system_modified()
|
|
{
|
|
local ret
|
|
|
|
[[ -f $TARGET_INITRD ]] || return 1
|
|
|
|
check_files_modified
|
|
ret=$?
|
|
if [ $ret -ne 0 ]; then
|
|
return $ret
|
|
fi
|
|
|
|
check_dump_fs_modified
|
|
ret=$?
|
|
if [ $ret -ne 0 ]; then
|
|
return $ret
|
|
fi
|
|
|
|
check_wdt_modified
|
|
if [ $? -ne 0 ]; then
|
|
echo "Detected change in watchdog state"
|
|
return 1
|
|
fi
|
|
|
|
check_kmodules_modified
|
|
if [ $? -ne 0 ]; then
|
|
return 1
|
|
fi
|
|
|
|
return 0
|
|
}
|
|
|
|
check_rebuild()
|
|
{
|
|
local extra_modules
|
|
local capture_capable_initrd="1"
|
|
local _force_rebuild force_rebuild="0"
|
|
local _force_no_rebuild force_no_rebuild="0"
|
|
local ret system_modified="0"
|
|
|
|
check_boot_dir
|
|
|
|
if [ -z "$KDUMP_KERNELVER" ]; then
|
|
kdump_kver=`uname -r`
|
|
else
|
|
kdump_kver=$KDUMP_KERNELVER
|
|
fi
|
|
|
|
kdump_kernel="${KDUMP_BOOTDIR}/${KDUMP_IMG}-${kdump_kver}${KDUMP_IMG_EXT}"
|
|
setup_initrd
|
|
if [ $? -ne 0 ]; then
|
|
return 1
|
|
fi
|
|
|
|
_force_no_rebuild=`grep ^force_no_rebuild $KDUMP_CONFIG_FILE 2>/dev/null`
|
|
if [ $? -eq 0 ]; then
|
|
force_no_rebuild=`echo $_force_no_rebuild | cut -d' ' -f2`
|
|
if [ "$force_no_rebuild" != "0" ] && [ "$force_no_rebuild" != "1" ];then
|
|
echo "Error: force_no_rebuild value is invalid"
|
|
return 1
|
|
fi
|
|
fi
|
|
|
|
_force_rebuild=`grep ^force_rebuild $KDUMP_CONFIG_FILE 2>/dev/null`
|
|
if [ $? -eq 0 ]; then
|
|
force_rebuild=`echo $_force_rebuild | cut -d' ' -f2`
|
|
if [ "$force_rebuild" != "0" ] && [ "$force_rebuild" != "1" ];then
|
|
echo "Error: force_rebuild value is invalid"
|
|
return 1
|
|
fi
|
|
fi
|
|
|
|
if [[ "$force_no_rebuild" == "1" && "$force_rebuild" == "1" ]]; then
|
|
echo "Error: force_rebuild and force_no_rebuild are enabled simultaneously in kdump.conf"
|
|
return 1
|
|
fi
|
|
|
|
# Will not rebuild kdump initrd
|
|
if [ "$force_no_rebuild" == "1" ]; then
|
|
return 0
|
|
fi
|
|
|
|
#will rebuild every time if extra_modules are specified
|
|
extra_modules=`grep ^extra_modules $KDUMP_CONFIG_FILE`
|
|
[ -n "$extra_modules" ] && force_rebuild="1"
|
|
|
|
#check to see if dependent files has been modified
|
|
#since last build of the image file
|
|
if [ -f $TARGET_INITRD ]; then
|
|
image_time=`stat -c "%Y" $TARGET_INITRD 2>/dev/null`
|
|
|
|
#in case of fadump mode, check whether the default/target
|
|
#initrd is already built with dump capture capability
|
|
if [ "$DEFAULT_DUMP_MODE" == "fadump" ]; then
|
|
capture_capable_initrd=$(lsinitrd -f $DRACUT_MODULES_FILE $TARGET_INITRD | grep ^kdumpbase$ | wc -l)
|
|
fi
|
|
fi
|
|
|
|
check_system_modified
|
|
ret=$?
|
|
if [ $ret -eq 2 ]; then
|
|
return 1
|
|
elif [ $ret -eq 1 ];then
|
|
system_modified="1"
|
|
fi
|
|
|
|
handle_mode_switch
|
|
|
|
if [ $image_time -eq 0 ]; then
|
|
echo -n "No kdump initial ramdisk found."; echo
|
|
elif [ "$capture_capable_initrd" == "0" ]; then
|
|
echo -n "Rebuild $TARGET_INITRD with dump capture support"; echo
|
|
elif [ "$force_rebuild" != "0" ]; then
|
|
echo -n "Force rebuild $TARGET_INITRD"; echo
|
|
elif [ "$system_modified" != "0" ]; then
|
|
:
|
|
else
|
|
return 0
|
|
fi
|
|
|
|
if [[ ! -w "$KDUMP_BOOTDIR" ]];then
|
|
echo "$KDUMP_BOOTDIR does not have write permission. Can not rebuild $TARGET_INITRD"
|
|
return 1
|
|
fi
|
|
|
|
echo "Rebuilding $TARGET_INITRD"
|
|
rebuild_initrd
|
|
return $?
|
|
}
|
|
|
|
# This function check iomem and determines if we have more than
|
|
# 4GB of ram available. Returns 1 if we do, 0 if we dont
|
|
need_64bit_headers()
|
|
{
|
|
return `tail -n 1 /proc/iomem | awk '{ split ($1, r, "-"); \
|
|
print (strtonum("0x" r[2]) > strtonum("0xffffffff")); }'`
|
|
}
|
|
|
|
# Load the kdump kernel specified in /etc/sysconfig/kdump
|
|
# If none is specified, try to load a kdump kernel with the same version
|
|
# as the currently running kernel.
|
|
load_kdump()
|
|
{
|
|
ARCH=`uname -m`
|
|
if [ "$ARCH" == "i686" -o "$ARCH" == "i386" ]
|
|
then
|
|
|
|
need_64bit_headers
|
|
if [ $? == 1 ]
|
|
then
|
|
FOUND_ELF_ARGS=`echo $KEXEC_ARGS | grep elf32-core-headers`
|
|
if [ -n "$FOUND_ELF_ARGS" ]
|
|
then
|
|
echo -n "Warning: elf32-core-headers overrides correct elf64 setting"
|
|
echo
|
|
else
|
|
KEXEC_ARGS="$KEXEC_ARGS --elf64-core-headers"
|
|
fi
|
|
else
|
|
FOUND_ELF_ARGS=`echo $KEXEC_ARGS | grep elf64-core-headers`
|
|
if [ -z "$FOUND_ELF_ARGS" ]
|
|
then
|
|
KEXEC_ARGS="$KEXEC_ARGS --elf32-core-headers"
|
|
fi
|
|
fi
|
|
fi
|
|
|
|
prepare_cmdline
|
|
|
|
# For secureboot enabled machines, use new kexec file based syscall.
|
|
# Old syscall will always fail as it does not have capability to
|
|
# to kernel signature verification.
|
|
if is_secure_boot_enforced; then
|
|
echo "Secure Boot is enabled. Using kexec file based syscall."
|
|
KEXEC_ARGS="$KEXEC_ARGS -s"
|
|
elif is_secure_mode_enforced; then
|
|
echo "securelevel is set to 1 (Secure Mode). Using kexec file based syscall."
|
|
KEXEC_ARGS="$KEXEC_ARGS -s"
|
|
fi
|
|
|
|
$KEXEC $KEXEC_ARGS $standard_kexec_args \
|
|
--command-line="$KDUMP_COMMANDLINE" \
|
|
--initrd=$TARGET_INITRD $kdump_kernel
|
|
if [ $? == 0 ]; then
|
|
echo "kexec: loaded kdump kernel"
|
|
return 0
|
|
else
|
|
echo "kexec: failed to load kdump kernel" >&2
|
|
return 1
|
|
fi
|
|
}
|
|
|
|
check_ssh_config()
|
|
{
|
|
while read config_opt config_val; do
|
|
case "$config_opt" in
|
|
sshkey)
|
|
# remove inline comments after the end of a directive.
|
|
config_val=$(strip_comments $config_val)
|
|
if [ -f "$config_val" ]; then
|
|
# canonicalize the path
|
|
SSH_KEY_LOCATION=$(/usr/bin/readlink -m $config_val)
|
|
else
|
|
echo "WARNING: '$config_val' doesn't exist, using default value '$SSH_KEY_LOCATION'"
|
|
fi
|
|
;;
|
|
path)
|
|
config_val=$(strip_comments $config_val)
|
|
SAVE_PATH=$config_val
|
|
;;
|
|
ssh)
|
|
config_val=$(strip_comments $config_val)
|
|
DUMP_TARGET=$config_val
|
|
;;
|
|
*)
|
|
;;
|
|
esac
|
|
done < $KDUMP_CONFIG_FILE
|
|
|
|
#make sure they've configured kdump.conf for ssh dumps
|
|
local SSH_TARGET=`echo -n $DUMP_TARGET | sed -n '/.*@/p'`
|
|
if [ -z "$SSH_TARGET" ]; then
|
|
return 1
|
|
fi
|
|
return 0
|
|
}
|
|
|
|
check_ssh_target()
|
|
{
|
|
local _ret
|
|
ssh -q -i $SSH_KEY_LOCATION -o BatchMode=yes $DUMP_TARGET mkdir -p $SAVE_PATH
|
|
_ret=$?
|
|
if [ $_ret -ne 0 ]; then
|
|
echo "Could not create $DUMP_TARGET:$SAVE_PATH, you probably need to run \"kdumpctl propagate\"" >&2
|
|
return 1
|
|
fi
|
|
return 0
|
|
}
|
|
|
|
propagate_ssh_key()
|
|
{
|
|
check_ssh_config
|
|
if [ $? -ne 0 ]; then
|
|
echo "No ssh config specified in $KDUMP_CONFIG_FILE. Can't propagate" >&2
|
|
exit 1
|
|
fi
|
|
|
|
local KEYFILE=$SSH_KEY_LOCATION
|
|
local errmsg="Failed to propagate ssh key"
|
|
|
|
#Check to see if we already created key, if not, create it.
|
|
if [ -f $KEYFILE ]; then
|
|
echo "Using existing keys..."
|
|
else
|
|
echo -n "Generating new ssh keys... "
|
|
/usr/bin/ssh-keygen -t rsa -f $KEYFILE -N "" 2>&1 > /dev/null
|
|
echo "done."
|
|
fi
|
|
|
|
#now find the target ssh user and server to contact.
|
|
SSH_USER=`echo $DUMP_TARGET | cut -d\ -f2 | cut -d@ -f1`
|
|
SSH_SERVER=`echo $DUMP_TARGET | sed -e's/\(.*@\)\(.*$\)/\2/'`
|
|
|
|
#now send the found key to the found server
|
|
ssh-copy-id -i $KEYFILE $SSH_USER@$SSH_SERVER
|
|
RET=$?
|
|
if [ $RET == 0 ]; then
|
|
echo $KEYFILE has been added to ~$SSH_USER/.ssh/authorized_keys on $SSH_SERVER
|
|
return 0
|
|
else
|
|
echo $errmsg, $KEYFILE failed in transfer to $SSH_SERVER >&2
|
|
exit 1
|
|
fi
|
|
}
|
|
|
|
show_reserved_mem()
|
|
{
|
|
local mem=$(cat /sys/kernel/kexec_crash_size)
|
|
local mem_mb=$(expr $mem / 1024 / 1024)
|
|
|
|
echo "Reserved "$mem_mb"MB memory for crash kernel"
|
|
}
|
|
|
|
handle_mode_switch()
|
|
{
|
|
if [ "$DEFAULT_DUMP_MODE" == "fadump" ]; then
|
|
# backup initrd for reference before replacing it
|
|
# with fadump aware initrd
|
|
backup_default_initrd
|
|
else
|
|
# check if a backup of default initrd exists. If yes,
|
|
# it signifies a switch from fadump mode. So, restore
|
|
# the backed up default initrd.
|
|
restore_default_initrd
|
|
fi
|
|
}
|
|
|
|
check_current_fadump_status()
|
|
{
|
|
# Check if firmware-assisted dump has been registered.
|
|
rc=`cat $FADUMP_REGISTER_SYS_NODE`
|
|
[ $rc -eq 1 ] && return 0
|
|
return 1
|
|
}
|
|
|
|
check_current_kdump_status()
|
|
{
|
|
rc=`cat /sys/kernel/kexec_crash_loaded`
|
|
if [ $rc == 1 ]; then
|
|
return 0
|
|
else
|
|
return 1
|
|
fi
|
|
}
|
|
|
|
check_current_status()
|
|
{
|
|
if [ $DEFAULT_DUMP_MODE == "fadump" ]; then
|
|
check_current_fadump_status
|
|
else
|
|
check_current_kdump_status
|
|
fi
|
|
|
|
return $?
|
|
}
|
|
|
|
save_raw()
|
|
{
|
|
local kdump_dir
|
|
local raw_target
|
|
|
|
raw_target=$(awk '$1 ~ /^raw$/ { print $2; }' $KDUMP_CONFIG_FILE)
|
|
[ -z "$raw_target" ] && return 0
|
|
[ -b "$raw_target" ] || {
|
|
echo "raw partition $raw_target not found"
|
|
return 1
|
|
}
|
|
kdump_dir=`grep ^path $KDUMP_CONFIG_FILE | cut -d' ' -f2-`
|
|
if [ -z "${kdump_dir}" ]; then
|
|
coredir="/var/crash/`date +"%Y-%m-%d-%H:%M"`"
|
|
else
|
|
coredir="${kdump_dir}/`date +"%Y-%m-%d-%H:%M"`"
|
|
fi
|
|
|
|
mkdir -p "$coredir"
|
|
[ -d "$coredir" ] || {
|
|
echo "failed to create $coredir"
|
|
return 1
|
|
}
|
|
if makedumpfile -R $coredir/vmcore <$raw_target >/dev/null 2>&1; then
|
|
# dump found
|
|
echo "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 "$coredir"
|
|
fi
|
|
|
|
return 0
|
|
}
|
|
|
|
is_dump_target_configured()
|
|
{
|
|
local _target
|
|
|
|
_target=$(egrep "^ext[234]|^xfs|^btrfs|^minix|^raw|^ssh|^nfs" /etc/kdump.conf)
|
|
|
|
[ -n "$_target" ]
|
|
}
|
|
|
|
local_fs_dump_target()
|
|
{
|
|
local _target
|
|
|
|
_target=$(egrep "^ext[234]|^xfs|^btrfs|^minix" /etc/kdump.conf)
|
|
if [ $? -eq 0 ]; then
|
|
echo $_target|awk '{print $2}'
|
|
fi
|
|
}
|
|
|
|
path_to_be_relabeled()
|
|
{
|
|
local _path _target _mnt="/" _rmnt
|
|
|
|
if is_dump_target_configured; then
|
|
_target=$(local_fs_dump_target)
|
|
if [[ -n "$_target" ]]; then
|
|
_mnt=$(findmnt -k -f -n -r -o TARGET $_target)
|
|
if [ -z "$_mnt" ]; then
|
|
return
|
|
fi
|
|
else
|
|
return
|
|
fi
|
|
fi
|
|
|
|
if is_mount_in_dracut_args; then
|
|
return;
|
|
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
|
|
|
|
for _i in $(find $_path); do
|
|
_attr=$(getfattr -m "security.selinux" $_i 2>/dev/null)
|
|
if [ -z "$_attr" ]; then
|
|
restorecon $_i;
|
|
fi
|
|
done
|
|
}
|
|
|
|
# Check if secure boot is being enforced.
|
|
#
|
|
# Per Peter Jones, we need check efivar SecureBoot-$(the UUID) and
|
|
# SetupMode-$(the UUID), they are both 5 bytes binary data. The first four
|
|
# bytes are the attributes associated with the variable and can safely be
|
|
# ignored, the last bytes are one-byte true-or-false variables. If SecureBoot
|
|
# is 1 and SetupMode is 0, then secure boot is being enforced.
|
|
#
|
|
# SecureBoot-UUID won't always be set when securelevel is 1. For legacy-mode
|
|
# and uefi-without-seucre-enabled system, we can manually enable secure mode
|
|
# by writing "1" to securelevel. So check both efi var and secure mode is a
|
|
# more sane way.
|
|
#
|
|
# Assume efivars is mounted at /sys/firmware/efi/efivars.
|
|
is_secure_boot_enforced()
|
|
{
|
|
local secure_boot_file setup_mode_file
|
|
local secure_boot_byte setup_mode_byte
|
|
|
|
secure_boot_file=$(find /sys/firmware/efi/efivars -name SecureBoot-* 2>/dev/null)
|
|
setup_mode_file=$(find /sys/firmware/efi/efivars -name SetupMode-* 2>/dev/null)
|
|
|
|
if [ -f "$secure_boot_file" ] && [ -f "$setup_mode_file" ]; then
|
|
secure_boot_byte=$(hexdump -v -e '/1 "%d\ "' $secure_boot_file|cut -d' ' -f 5)
|
|
setup_mode_byte=$(hexdump -v -e '/1 "%d\ "' $setup_mode_file|cut -d' ' -f 5)
|
|
|
|
if [ "$secure_boot_byte" = "1" ] && [ "$setup_mode_byte" = "0" ]; then
|
|
return 0
|
|
fi
|
|
fi
|
|
|
|
return 1
|
|
}
|
|
|
|
# Check if secure mode is being enforced (securelevel =? 1)
|
|
is_secure_mode_enforced()
|
|
{
|
|
local secure_mode_byte
|
|
|
|
if [ ! -f /sys/kernel/security/securelevel ]; then
|
|
return 1
|
|
fi
|
|
|
|
secure_mode_byte=$(cat /sys/kernel/security/securelevel)
|
|
if [ "$secure_mode_byte" = "1" ]; then
|
|
return 0
|
|
fi
|
|
|
|
return 1
|
|
}
|
|
|
|
check_crash_mem_reserved()
|
|
{
|
|
local mem_reserved
|
|
|
|
mem_reserved=$(cat /sys/kernel/kexec_crash_size)
|
|
if [ $mem_reserved -eq 0 ]; then
|
|
echo "No memory reserved for crash kernel"
|
|
return 1
|
|
fi
|
|
|
|
return 0
|
|
}
|
|
|
|
check_kdump_feasibility()
|
|
{
|
|
if [ ! -e /sys/kernel/kexec_crash_loaded ]; then
|
|
echo "Kdump is not supported on this kernel"
|
|
return 1
|
|
fi
|
|
check_crash_mem_reserved
|
|
return $?
|
|
}
|
|
|
|
check_fence_kdump_config()
|
|
{
|
|
local hostname=`hostname`
|
|
local ipaddrs=`hostname -I`
|
|
local nodes=$(get_option_value "fence_kdump_nodes")
|
|
|
|
for node in $nodes; do
|
|
if [ "$node" = "$hostname" ]; then
|
|
echo "Option fence_kdump_nodes cannot contain $hostname"
|
|
return 1
|
|
fi
|
|
# node can be ipaddr
|
|
echo $ipaddrs | grep $node > /dev/null
|
|
if [ $? -eq 0 ]; then
|
|
echo "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
|
|
return $?
|
|
}
|
|
|
|
start_fadump()
|
|
{
|
|
echo 1 > $FADUMP_REGISTER_SYS_NODE
|
|
if ! check_current_fadump_status; then
|
|
echo "fadump: failed to register"
|
|
return 1
|
|
fi
|
|
|
|
echo "fadump: registered successfully"
|
|
return 0
|
|
}
|
|
|
|
start_dump()
|
|
{
|
|
if [ $DEFAULT_DUMP_MODE == "fadump" ]; then
|
|
start_fadump
|
|
else
|
|
load_kdump
|
|
fi
|
|
|
|
return $?
|
|
}
|
|
|
|
check_default_config()
|
|
{
|
|
local default_option
|
|
|
|
default_option=$(awk '$1 ~ /^default$/ {print $2;}' $KDUMP_CONFIG_FILE)
|
|
if [ -z "$default_option" ]; then
|
|
return 0
|
|
else
|
|
case "$default_option" in
|
|
reboot|halt|poweroff|shell|dump_to_rootfs)
|
|
return 0
|
|
;;
|
|
*)
|
|
echo $"Usage kdump.conf: default {reboot|halt|poweroff|shell|dump_to_rootfs}"
|
|
return 1
|
|
esac
|
|
fi
|
|
}
|
|
|
|
start()
|
|
{
|
|
check_dump_feasibility
|
|
if [ $? -ne 0 ]; then
|
|
echo "Starting kdump: [FAILED]"
|
|
return 1
|
|
fi
|
|
|
|
check_config
|
|
if [ $? -ne 0 ]; then
|
|
echo "Starting kdump: [FAILED]"
|
|
return 1
|
|
fi
|
|
|
|
if sestatus 2>/dev/null | grep -q "SELinux status.*enabled"; then
|
|
selinux_relabel
|
|
fi
|
|
|
|
save_raw
|
|
if [ $? -ne 0 ]; then
|
|
echo "Starting kdump: [FAILED]"
|
|
return 1
|
|
fi
|
|
|
|
check_current_status
|
|
if [ $? == 0 ]; then
|
|
echo "Kdump already running: [WARNING]"
|
|
return 0
|
|
fi
|
|
|
|
if check_ssh_config; then
|
|
if ! check_ssh_target; then
|
|
echo "Starting kdump: [FAILED]"
|
|
return 1
|
|
fi
|
|
fi
|
|
|
|
check_rebuild
|
|
if [ $? != 0 ]; then
|
|
echo "Starting kdump: [FAILED]"
|
|
return 1
|
|
fi
|
|
|
|
start_dump
|
|
if [ $? != 0 ]; then
|
|
echo "Starting kdump: [FAILED]"
|
|
return 1
|
|
fi
|
|
|
|
echo "Starting kdump: [OK]"
|
|
}
|
|
|
|
stop_fadump()
|
|
{
|
|
echo 0 > $FADUMP_REGISTER_SYS_NODE
|
|
if check_current_fadump_status; then
|
|
echo "fadump: failed to unregister"
|
|
return 1
|
|
fi
|
|
|
|
echo "fadump: unregistered successfully"
|
|
return 0
|
|
}
|
|
|
|
stop_kdump()
|
|
{
|
|
if is_secure_boot_enforced; then
|
|
$KEXEC -s -p -u
|
|
else
|
|
$KEXEC -p -u
|
|
fi
|
|
|
|
if [ $? != 0 ]; then
|
|
echo "kexec: failed to unload kdump kernel"
|
|
return 1
|
|
fi
|
|
|
|
echo "kexec: unloaded kdump kernel"
|
|
return 0
|
|
}
|
|
|
|
stop()
|
|
{
|
|
if [ $DEFAULT_DUMP_MODE == "fadump" ]; then
|
|
stop_fadump
|
|
else
|
|
stop_kdump
|
|
fi
|
|
|
|
if [ $? != 0 ]; then
|
|
echo "Stopping kdump: [FAILED]"
|
|
return 1
|
|
fi
|
|
|
|
echo "Stopping kdump: [OK]"
|
|
return 0
|
|
}
|
|
|
|
if [ ! -f "$KDUMP_CONFIG_FILE" ]; then
|
|
echo "Error: No kdump config file found!" >&2
|
|
exit 1
|
|
fi
|
|
|
|
main ()
|
|
{
|
|
# Determine if the dump mode is kdump or fadump
|
|
determine_dump_mode
|
|
|
|
case "$1" in
|
|
start)
|
|
if [ -s /proc/vmcore ]; then
|
|
save_core
|
|
reboot
|
|
else
|
|
start
|
|
fi
|
|
;;
|
|
stop)
|
|
stop
|
|
;;
|
|
status)
|
|
EXIT_CODE=0
|
|
check_current_status
|
|
case "$?" in
|
|
0)
|
|
echo "Kdump is operational"
|
|
EXIT_CODE=0
|
|
;;
|
|
1)
|
|
echo "Kdump is not operational"
|
|
EXIT_CODE=3
|
|
;;
|
|
esac
|
|
exit $EXIT_CODE
|
|
;;
|
|
restart)
|
|
stop
|
|
start
|
|
;;
|
|
condrestart)
|
|
;;
|
|
propagate)
|
|
propagate_ssh_key
|
|
;;
|
|
showmem)
|
|
show_reserved_mem
|
|
;;
|
|
*)
|
|
echo $"Usage: $0 {start|stop|status|restart|propagate|showmem}"
|
|
exit 1
|
|
esac
|
|
}
|
|
|
|
# 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 $1)
|
|
|
|
exit $?
|