#!/bin/bash # # Kdump common variables and functions # . /usr/lib/kdump/kdump-lib-initramfs.sh FENCE_KDUMP_CONFIG_FILE="/etc/sysconfig/fence_kdump" FENCE_KDUMP_SEND="/usr/libexec/fence_kdump_send" FADUMP_ENABLED_SYS_NODE="/sys/kernel/fadump_enabled" is_fadump_capable() { # Check if firmware-assisted dump is enabled # if no, fallback to kdump check if [[ -f $FADUMP_ENABLED_SYS_NODE ]]; then rc=$(< $FADUMP_ENABLED_SYS_NODE) [[ $rc -eq 1 ]] && return 0 fi return 1 } is_squash_available() { for kmodule in squashfs overlay loop; do if [[ -z $KDUMP_KERNELVER ]]; then modprobe --dry-run $kmodule &> /dev/null || return 1 else modprobe -S "$KDUMP_KERNELVER" --dry-run $kmodule &> /dev/null || return 1 fi done } perror_exit() { derror "$@" exit 1 } # Check if fence kdump is configured in Pacemaker cluster is_pcs_fence_kdump() { # no pcs or fence_kdump_send executables installed? type -P pcs > /dev/null || return 1 [[ -x $FENCE_KDUMP_SEND ]] || return 1 # fence kdump not configured? (pcs cluster cib | grep 'type="fence_kdump"') &> /dev/null || return 1 } # Check if fence_kdump is configured using kdump options is_generic_fence_kdump() { [[ -x $FENCE_KDUMP_SEND ]] || return 1 [[ $(kdump_get_conf_val fence_kdump_nodes) ]] } to_dev_name() { local dev="${1//\"/}" case "$dev" in UUID=*) blkid -U "${dev#UUID=}" ;; LABEL=*) blkid -L "${dev#LABEL=}" ;; *) echo "$dev" ;; esac } is_user_configured_dump_target() { [[ $(kdump_get_conf_val "ext[234]\|xfs\|btrfs\|minix\|raw\|nfs\|ssh") ]] || is_mount_in_dracut_args } get_user_configured_dump_disk() { local _target _target=$(kdump_get_conf_val "ext[234]\|xfs\|btrfs\|minix\|raw") [[ -n $_target ]] && echo "$_target" && return _target=$(get_dracut_args_target "$(kdump_get_conf_val "dracut_args")") [[ -b $_target ]] && echo "$_target" } get_block_dump_target() { local _target _path if is_ssh_dump_target || is_nfs_dump_target; then return fi _target=$(get_user_configured_dump_disk) [[ -n $_target ]] && to_dev_name "$_target" && return # Get block device name from local save path _path=$(get_save_path) _target=$(get_target_from_path "$_path") [[ -b $_target ]] && to_dev_name "$_target" } is_dump_to_rootfs() { [[ $(kdump_get_conf_val "failure_action|default") == dump_to_rootfs ]] } get_failure_action_target() { local _target if is_dump_to_rootfs; then # Get rootfs device name _target=$(get_root_fs_device) [[ -b $_target ]] && to_dev_name "$_target" && return # Then, must be nfs root echo "nfs" fi } # Get kdump targets(including root in case of dump_to_rootfs). get_kdump_targets() { local _target _root local kdump_targets _target=$(get_block_dump_target) if [[ -n $_target ]]; then kdump_targets=$_target elif is_ssh_dump_target; then kdump_targets="ssh" else kdump_targets="nfs" fi # Add the root device if dump_to_rootfs is specified. _root=$(get_failure_action_target) if [[ -n $_root ]] && [[ $kdump_targets != "$_root" ]]; then kdump_targets="$kdump_targets $_root" fi echo "$kdump_targets" } # Return the bind mount source path, return the path itself if it's not bind mounted # Eg. if /path/to/src is bind mounted to /mnt/bind, then: # /mnt/bind -> /path/to/src, /mnt/bind/dump -> /path/to/src/dump # # findmnt uses the option "-v, --nofsroot" to exclusive the [/dir] # in the SOURCE column for bind-mounts, then if $_src equals to # $_src_nofsroot, the mountpoint is not bind mounted directory. # # Below is just an example for mount info # /dev/mapper/atomicos-root[/ostree/deploy/rhel-atomic-host/var], if the # directory is bind mounted. The former part represents the device path, rest # part is the bind mounted directory which quotes by bracket "[]". get_bind_mount_source() { local _mnt _path _src _opt _fstype local _fsroot _src_nofsroot _mnt=$(df "$1" | tail -1 | awk '{print $NF}') _path=${1#$_mnt} _src=$(get_mount_info SOURCE target "$_mnt" -f) _opt=$(get_mount_info OPTIONS target "$_mnt" -f) _fstype=$(get_mount_info FSTYPE target "$_mnt" -f) # bind mount in fstab if [[ -d $_src ]] && [[ $_fstype == none ]] && (echo "$_opt" | grep -q "\bbind\b"); then echo "$_src$_path" && return fi # direct mount _src_nofsroot=$(get_mount_info SOURCE target "$_mnt" -v -f) if [[ $_src_nofsroot == "$_src" ]]; then echo "$_mnt$_path" && return fi _fsroot=${_src#${_src_nofsroot}[} _fsroot=${_fsroot%]} _mnt=$(get_mount_info TARGET source "$_src_nofsroot" -f) # for btrfs, _fsroot will also contain the subvol value as well, strip it if [[ $_fstype == btrfs ]]; then local _subvol _subvol=${_opt#*subvol=} _subvol=${_subvol%,*} _fsroot=${_fsroot#$_subvol} fi echo "$_mnt$_fsroot$_path" } get_mntopt_from_target() { get_mount_info OPTIONS source "$1" -f } # Get the path where the target will be mounted in kdump kernel # $1: kdump target device get_kdump_mntpoint_from_target() { local _mntpoint _mntpoint=$(get_mntpoint_from_target "$1") # mount under /sysroot if dump to root disk or mount under # mount under /kdumproot if dump target is not mounted in first kernel # mount under /kdumproot/$_mntpoint in other cases in 2nd kernel. # systemd will be in charge to umount it. if [[ -z $_mntpoint ]]; then _mntpoint="/kdumproot" else if [[ $_mntpoint == "/" ]]; then _mntpoint="/sysroot" else _mntpoint="/kdumproot/$_mntpoint" fi fi # strip duplicated "/" echo $_mntpoint | tr -s "/" } kdump_get_persistent_dev() { local dev="${1//\"/}" case "$dev" in UUID=*) dev=$(blkid -U "${dev#UUID=}") ;; LABEL=*) dev=$(blkid -L "${dev#LABEL=}") ;; esac echo $(get_persistent_dev "$dev") } is_atomic() { grep -q "ostree" /proc/cmdline } # get ip address or hostname from nfs/ssh config value get_remote_host() { local _config_val=$1 # ipv6 address in kdump.conf is around with "[]", # factor out the ipv6 address _config_val=${_config_val#*@} _config_val=${_config_val%:/*} _config_val=${_config_val#[} _config_val=${_config_val%]} echo "$_config_val" } is_hostname() { local _hostname _hostname=$(echo "$1" | grep ":") if [[ -n $_hostname ]]; then return 1 fi echo "$1" | grep -q "[a-zA-Z]" } # Copied from "/etc/sysconfig/network-scripts/network-functions" get_hwaddr() { if [[ -f "/sys/class/net/$1/address" ]]; then awk '{ print toupper($0) }' < "/sys/class/net/$1/address" elif [[ -d "/sys/class/net/$1" ]]; then LC_ALL="" LANG="" ip -o link show "$1" 2> /dev/null | awk '{ print toupper(gensub(/.*link\/[^ ]* ([[:alnum:]:]*).*/, "\\1", 1)); }' fi } # Get value by a field using "nmcli -g" # Usage: get_nmcli_value_by_field # # "nmcli --get-values" allows us to retrive value(s) by field, for example, # nmcli --get-values connection show /org/freedesktop/NetworkManager/ActiveConnection/1 # returns the following value for the corresponding field respectively, # Field Value # IP4.DNS "10.19.42.41 | 10.11.5.19 | 10.5.30.160" # 802-3-ethernet.s390-subchannels "" # bond.options "mode=balance-rr" get_nmcli_value_by_field() { LANG=C nmcli --get-values "$@" } # Get nmcli field value of an connection apath (a D-Bus active connection path) # Usage: get_nmcli_field_by_apath get_nmcli_field_by_conpath() { local _field=$1 _apath=$2 get_nmcli_value_by_field "$_field" connection show "$_apath" } # Get nmcli connection apath (a D-Bus active connection path ) by ifname # # apath is used for nmcli connection operations, e.g. # $ nmcli connection show $apath get_nmcli_connection_apath_by_ifname() { local _ifname=$1 get_nmcli_value_by_field "GENERAL.CON-PATH" device show "$_ifname" } get_ifcfg_by_device() { grep -E -i -l "^[[:space:]]*DEVICE=\"*${1}\"*[[:space:]]*$" \ /etc/sysconfig/network-scripts/ifcfg-* 2> /dev/null | head -1 } get_ifcfg_by_hwaddr() { grep -E -i -l "^[[:space:]]*HWADDR=\"*${1}\"*[[:space:]]*$" \ /etc/sysconfig/network-scripts/ifcfg-* 2> /dev/null | head -1 } get_ifcfg_by_uuid() { grep -E -i -l "^[[:space:]]*UUID=\"*${1}\"*[[:space:]]*$" \ /etc/sysconfig/network-scripts/ifcfg-* 2> /dev/null | head -1 } get_ifcfg_by_name() { grep -E -i -l "^[[:space:]]*NAME=\"*${1}\"*[[:space:]]*$" \ /etc/sysconfig/network-scripts/ifcfg-* 2> /dev/null | head -1 } is_nm_running() { [[ "$(LANG=C nmcli -t --fields running general status 2> /dev/null)" == "running" ]] } is_nm_handling() { LANG=C nmcli -t --fields device,state dev status 2> /dev/null | grep -q "^\(${1}:connected\)\|\(${1}:connecting.*\)$" } # $1: netdev name get_ifcfg_nmcli() { local nm_uuid nm_name local ifcfg_file # Get the active nmcli config name of $1 if is_nm_running && is_nm_handling "${1}"; then # The configuration "uuid" and "name" generated by nm is wrote to # the ifcfg file as "UUID=" and "NAME=". nm_uuid=$(LANG=C nmcli -t --fields uuid,device c show --active 2> /dev/null | grep "${1}" | head -1 | cut -d':' -f1) nm_name=$(LANG=C nmcli -t --fields name,device c show --active 2> /dev/null | grep "${1}" | head -1 | cut -d':' -f1) ifcfg_file=$(get_ifcfg_by_uuid "${nm_uuid}") [[ -z ${ifcfg_file} ]] && ifcfg_file=$(get_ifcfg_by_name "${nm_name}") fi echo -n "${ifcfg_file}" } # $1: netdev name get_ifcfg_legacy() { local ifcfg_file hwaddr ifcfg_file="/etc/sysconfig/network-scripts/ifcfg-${1}" [[ -f ${ifcfg_file} ]] && echo -n "${ifcfg_file}" && return ifcfg_file=$(get_ifcfg_by_name "${1}") [[ -f ${ifcfg_file} ]] && echo -n "${ifcfg_file}" && return hwaddr=$(get_hwaddr "${1}") if [[ -n $hwaddr ]]; then ifcfg_file=$(get_ifcfg_by_hwaddr "${hwaddr}") [[ -f ${ifcfg_file} ]] && echo -n "${ifcfg_file}" && return fi ifcfg_file=$(get_ifcfg_by_device "${1}") echo -n "${ifcfg_file}" } # $1: netdev name # Return the ifcfg file whole name(including the path) of $1 if any. get_ifcfg_filename() { local ifcfg_file ifcfg_file=$(get_ifcfg_nmcli "${1}") if [[ -z ${ifcfg_file} ]]; then ifcfg_file=$(get_ifcfg_legacy "${1}") fi echo -n "${ifcfg_file}" } # returns 0 when omission of a module is desired in dracut_args # returns 1 otherwise is_dracut_mod_omitted() { local dracut_args dracut_mod=$1 set -- $(kdump_get_conf_val dracut_args) while [ $# -gt 0 ]; do case $1 in -o | --omit) [[ " ${2//[^[:alnum:]]/ } " == *" $dracut_mod "* ]] && return 0 ;; esac shift done return 1 } is_wdt_active() { local active [[ -d /sys/class/watchdog ]] || return 1 for dir in /sys/class/watchdog/*; do [[ -f "$dir/state" ]] || continue active=$(< "$dir/state") [[ $active == "active" ]] && return 0 done return 1 } # If "dracut_args" contains "--mount" information, use it # directly without any check(users are expected to ensure # its correctness). is_mount_in_dracut_args() { [[ " $(kdump_get_conf_val dracut_args)" =~ .*[[:space:]]--mount[=[:space:]].* ]] } check_crash_mem_reserved() { local mem_reserved mem_reserved=$(< /sys/kernel/kexec_crash_size) if [[ $mem_reserved -eq 0 ]]; then derror "No memory reserved for crash kernel" return 1 fi return 0 } check_kdump_feasibility() { if [[ ! -e /sys/kernel/kexec_crash_loaded ]]; then derror "Kdump is not supported on this kernel" return 1 fi check_crash_mem_reserved return $? } check_current_kdump_status() { if [[ ! -f /sys/kernel/kexec_crash_loaded ]]; then derror "Perhaps CONFIG_CRASH_DUMP is not enabled in kernel" return 1 fi rc=$(< /sys/kernel/kexec_crash_loaded) if [[ $rc == 1 ]]; then return 0 else return 1 fi } # remove_cmdline_param [] ... [] # Remove a list of kernel parameters from a given kernel cmdline and print the result. # For each "arg" in the removing params list, "arg" and "arg=xxx" will be removed if exists. remove_cmdline_param() { local cmdline=$1 shift for arg in "$@"; do cmdline=$(echo "$cmdline" | sed -e "s/\b$arg=[^ ]*//g" \ -e "s/^$arg\b//g" \ -e "s/[[:space:]]$arg\b//g" \ -e "s/\s\+/ /g") done echo "$cmdline" } # # This function returns the "apicid" of the boot # cpu (cpu 0) if present. # get_bootcpu_apicid() { awk ' \ BEGIN { CPU = "-1"; } \ $1=="processor" && $2==":" { CPU = $NF; } \ CPU=="0" && /^apicid/ { print $NF; } \ ' \ /proc/cpuinfo } # # append_cmdline # This function appends argument "$2=$3" to string ($1) if not already present. # append_cmdline() { local cmdline=$1 local newstr=${cmdline/$2/""} # unchanged str implies argument wasn't there if [[ $cmdline == "$newstr" ]]; then cmdline="${cmdline} ${2}=${3}" fi echo "$cmdline" } # This function check iomem and determines if we have more than # 4GB of ram available. Returns 1 if we do, 0 if we dont need_64bit_headers() { return "$(tail -n 1 /proc/iomem | awk '{ split ($1, r, "-"); print (strtonum("0x" r[2]) > strtonum("0xffffffff")); }')" } # Check if secure boot is being enforced. # # Per Peter Jones, we need check efivar SecureBoot-$(the UUID) and # SetupMode-$(the UUID), they are both 5 bytes binary data. The first four # bytes are the attributes associated with the variable and can safely be # ignored, the last bytes are one-byte true-or-false variables. If SecureBoot # is 1 and SetupMode is 0, then secure boot is being enforced. # # Assume efivars is mounted at /sys/firmware/efi/efivars. is_secure_boot_enforced() { local secure_boot_file setup_mode_file local secure_boot_byte setup_mode_byte # On powerpc, os-secureboot-enforcing DT property indicates whether secureboot # is enforced. Return success, if it is found. if [[ -f /proc/device-tree/ibm,secureboot/os-secureboot-enforcing ]]; then return 0 fi # Detect secure boot on x86 and arm64 secure_boot_file=$(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" ]] && [[ $setup_mode_byte == "0" ]]; then return 0 fi fi # Detect secure boot on s390x if [[ -e "/sys/firmware/ipl/secure" && "$(< /sys/firmware/ipl/secure)" == "1" ]]; then return 0 fi return 1 } # # prepare_kexec_args # This function prepares kexec argument. # prepare_kexec_args() { local kexec_args=$1 local found_elf_args ARCH=$(uname -m) if [[ $ARCH == "i686" ]] || [[ $ARCH == "i386" ]]; then need_64bit_headers if [[ $? == 1 ]]; then found_elf_args=$(echo "$kexec_args" | grep elf32-core-headers) if [[ -n $found_elf_args ]]; then dwarn "Warning: elf32-core-headers overrides correct elf64 setting" else kexec_args="$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 echo "$kexec_args" } # # Detect initrd and kernel location, results are stored in global enviromental variables: # KDUMP_BOOTDIR, KDUMP_KERNELVER, KDUMP_KERNEL, DEFAULT_INITRD, and KDUMP_INITRD # # Expectes KDUMP_BOOTDIR, KDUMP_IMG, KDUMP_IMG_EXT, KDUMP_KERNELVER to be loaded from config already # and will prefer already set values so user can specify custom kernel/initramfs location # prepare_kdump_bootinfo() { local boot_img boot_imglist boot_dirlist boot_initrdlist local machine_id if [[ -z $KDUMP_KERNELVER ]]; then KDUMP_KERNELVER="$(uname -r)" fi read -r machine_id < /etc/machine-id boot_dirlist=${KDUMP_BOOTDIR:-"/boot /boot/efi /efi /"} boot_imglist="$KDUMP_IMG-$KDUMP_KERNELVER$KDUMP_IMG_EXT $machine_id/$KDUMP_KERNELVER/$KDUMP_IMG" # Use BOOT_IMAGE as reference if possible, strip the GRUB root device prefix in (hd0,gpt1) format boot_img="$(sed "s/^BOOT_IMAGE=\((\S*)\)\?\(\S*\) .*/\2/" /proc/cmdline)" if [[ -n $boot_img ]]; then boot_imglist="$boot_img $boot_imglist" fi for dir in $boot_dirlist; do for img in $boot_imglist; do if [[ -f "$dir/$img" ]]; then KDUMP_KERNEL=$(echo "$dir/$img" | tr -s '/') break 2 fi done done if ! [[ -e $KDUMP_KERNEL ]]; then derror "Failed to detect kdump kernel location" return 1 fi # Set KDUMP_BOOTDIR to where kernel image is stored KDUMP_BOOTDIR=$(dirname "$KDUMP_KERNEL") # Default initrd should just stay aside of kernel image, try to find it in KDUMP_BOOTDIR boot_initrdlist="initramfs-$KDUMP_KERNELVER.img initrd" for initrd in $boot_initrdlist; do if [[ -f "$KDUMP_BOOTDIR/$initrd" ]]; then defaut_initrd_base="$initrd" DEFAULT_INITRD="$KDUMP_BOOTDIR/$defaut_initrd_base" break fi done # Create kdump initrd basename from default initrd basename # initramfs-5.7.9-200.fc32.x86_64.img => initramfs-5.7.9-200.fc32.x86_64kdump.img # initrd => initrdkdump if [[ -z $defaut_initrd_base ]]; then kdump_initrd_base=initramfs-${KDUMP_KERNELVER}kdump.img elif [[ $defaut_initrd_base == *.* ]]; then kdump_initrd_base=${defaut_initrd_base%.*}kdump.${DEFAULT_INITRD##*.} else kdump_initrd_base=${defaut_initrd_base}kdump fi # Place kdump initrd in $(/var/lib/kdump) if $(KDUMP_BOOTDIR) not writable if [[ ! -w $KDUMP_BOOTDIR ]]; then var_target_initrd_dir="/var/lib/kdump" mkdir -p "$var_target_initrd_dir" KDUMP_INITRD="$var_target_initrd_dir/$kdump_initrd_base" else KDUMP_INITRD="$KDUMP_BOOTDIR/$kdump_initrd_base" fi } get_watchdog_drvs() { local _wdtdrvs _drv _dir for _dir in /sys/class/watchdog/*; do # device/modalias will return driver of this device [[ -f "$_dir/device/modalias" ]] || continue _drv=$(< "$_dir/device/modalias") _drv=$(modprobe --set-version "$KDUMP_KERNELVER" -R "$_drv" 2> /dev/null) for i in $_drv; do if ! [[ " $_wdtdrvs " == *" $i "* ]]; then _wdtdrvs="$_wdtdrvs $i" fi done done echo "$_wdtdrvs" } # # prepare_cmdline # This function performs a series of edits on the command line. # Store the final result in global $KDUMP_COMMANDLINE. prepare_cmdline() { local cmdline id arg if [[ -z $1 ]]; then cmdline=$(< /proc/cmdline) else cmdline="$1" fi # These params should always be removed cmdline=$(remove_cmdline_param "$cmdline" crashkernel panic_on_warn) # These params can be removed configurably while read -r arg; do cmdline=$(remove_cmdline_param "$cmdline" "$arg") done <<< "$(echo "$2" | xargs -n 1 echo)" # Always remove "root=X", as we now explicitly generate all kinds # of dump target mount information including root fs. # # We do this before KDUMP_COMMANDLINE_APPEND, if one really cares # about it(e.g. for debug purpose), then can pass "root=X" using # KDUMP_COMMANDLINE_APPEND. cmdline=$(remove_cmdline_param "$cmdline" root) # With the help of "--hostonly-cmdline", we can avoid some interitage. cmdline=$(remove_cmdline_param "$cmdline" rd.lvm.lv rd.luks.uuid rd.dm.uuid rd.md.uuid fcoe) # Remove netroot, rd.iscsi.initiator and iscsi_initiator since # we get duplicate entries for the same in case iscsi code adds # it as well. cmdline=$(remove_cmdline_param "$cmdline" netroot rd.iscsi.initiator iscsi_initiator) cmdline="${cmdline} $3" id=$(get_bootcpu_apicid) if [[ -n ${id} ]]; then cmdline=$(append_cmdline "$cmdline" disable_cpu_apicid "$id") fi # If any watchdog is used, set it's pretimeout to 0. pretimeout let # watchdog panic the kernel first, and reset the system after the # panic. If the system is already in kdump, panic is not helpful # and only increase the chance of watchdog failure. for i in $(get_watchdog_drvs); do cmdline+=" $i.pretimeout=0" if [[ $i == hpwdt ]]; then # hpwdt have a special parameter kdumptimeout, is's only suppose # to be set to non-zero in first kernel. In kdump, non-zero # value could prevent the watchdog from resetting the system. cmdline+=" $i.kdumptimeout=0" fi done # Remove trace_buf_size, trace_event cmdline=$(remove_cmdline_param "$cmdline" trace_buf_size trace_event) cmdline="${cmdline} trace_buf_size=1" echo "$cmdline" } #get system memory size in the unit of GB get_system_size() { result=$(grep "System RAM" /proc/iomem | awk -F ":" '{ print $1 }' | tr "[:lower:]" "[:upper:]" | paste -sd+) result="+$result" # replace '-' with '+0x' and '+' with '-0x' sum=$(echo "$result" | sed -e 's/-/K0x/g' -e 's/+/-0x/g' -e 's/K/+/g') size=$(printf "%d\n" $((sum))) size=$((size / 1024 / 1024 / 1024)) echo "$size" } get_recommend_size() { local mem_size=$1 local _ck_cmdline=$2 local OLDIFS="$IFS" start=${_ck_cmdline::1} if [[ $mem_size -lt $start ]]; then echo "0M" return fi IFS=',' for i in $_ck_cmdline; do end=$(echo "$i" | awk -F "-" '{ print $2 }' | awk -F ":" '{ print $1 }') recommend=$(echo "$i" | awk -F "-" '{ print $2 }' | awk -F ":" '{ print $2 }') size=${end::-1} unit=${end: -1} if [[ $unit == 'T' ]]; then size=$((size * 1024)) fi if [[ $mem_size -lt $size ]]; then echo "$recommend" IFS="$OLDIFS" return fi done IFS="$OLDIFS" } # return recommended size based on current system RAM size # $1: kernel version, if not set, will defaults to $(uname -r) kdump_get_arch_recommend_size() { local kernel=$1 arch if ! [[ -r "/proc/iomem" ]]; then echo "Error, can not access /proc/iomem." return 1 fi [[ -z $kernel ]] && kernel=$(uname -r) ck_cmdline=$(cat "/usr/lib/modules/$kernel/crashkernel.default" 2> /dev/null) if [[ -n $ck_cmdline ]]; then ck_cmdline=${ck_cmdline#crashkernel=} else arch=$(lscpu | grep Architecture | awk -F ":" '{ print $2 }' | tr '[:lower:]' '[:upper:]') if [[ $arch == "X86_64" ]] || [[ $arch == "S390X" ]]; then ck_cmdline="1G-4G:160M,4G-64G:192M,64G-1T:256M,1T-:512M" elif [[ $arch == "AARCH64" ]]; then ck_cmdline="2G-:448M" elif [[ $arch == "PPC64LE" ]]; then if is_fadump_capable; then ck_cmdline="4G-16G:768M,16G-64G:1G,64G-128G:2G,128G-1T:4G,1T-2T:6G,2T-4T:12G,4T-8T:20G,8T-16T:36G,16T-32T:64G,32T-64T:128G,64T-:180G" else ck_cmdline="2G-4G:384M,4G-16G:512M,16G-64G:1G,64G-128G:2G,128G-:4G" fi fi fi ck_cmdline=${ck_cmdline//-:/-102400T:} sys_mem=$(get_system_size) get_recommend_size "$sys_mem" "$ck_cmdline" } # Print all underlying crypt devices of a block device # print nothing if device is not on top of a crypt device # $1: the block device to be checked in maj:min format get_luks_crypt_dev() { local _type [[ -b /dev/block/$1 ]] || return 1 _type=$(eval "$(blkid -u filesystem,crypto -o export -- "/dev/block/$1"); echo \$TYPE") [[ $_type == "crypto_LUKS" ]] && echo "$1" for _x in "/sys/dev/block/$1/slaves/"*; do [[ -f $_x/dev ]] || continue [[ $_x/subsystem -ef /sys/class/block ]] || continue get_luks_crypt_dev "$(< "$_x/dev")" done } # kdump_get_maj_min # Prints the major and minor of a device node. # Example: # $ get_maj_min /dev/sda2 # 8:2 kdump_get_maj_min() { local _majmin _majmin="$(stat -L -c '%t:%T' "$1" 2> /dev/null)" printf "%s" "$((0x${_majmin%:*})):$((0x${_majmin#*:}))" } get_all_kdump_crypt_dev() { local _dev for _dev in $(get_block_dump_target); do get_luks_crypt_dev "$(kdump_get_maj_min "$_dev")" done } 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=$1 tmp=$(mktemp /tmp/vmlinux-XXX) trap 'rm -f "$tmp"' 0 # Try to check if it's a vmlinux already check_vmlinux "$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 }