Current File : //proc/thread-self/root/usr/lib/kdump/kdump-lib.sh
#!/bin/sh
#
# Kdump common variables and functions
#
DEFAULT_PATH="/var/crash/"
FENCE_KDUMP_CONFIG_FILE="/etc/sysconfig/fence_kdump"
FENCE_KDUMP_SEND="/usr/libexec/fence_kdump_send"
FADUMP_ENABLED_SYS_NODE="/sys/kernel/fadump_enabled"
LVM_CONF="/etc/lvm/lvm.conf"
is_fadump_capable()
{
# Check if firmware-assisted dump is enabled
# if no, fallback to kdump check
if [ -f $FADUMP_ENABLED_SYS_NODE ]; then
rc=`cat $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
}
is_ssh_dump_target()
{
grep -q "^ssh[[:blank:]].*@" /etc/kdump.conf
}
is_nfs_dump_target()
{
grep -q "^nfs" /etc/kdump.conf || \
[[ $(get_dracut_args_fstype "$(grep "^dracut_args .*\-\-mount" /etc/kdump.conf)") = nfs* ]]
}
is_raw_dump_target()
{
grep -q "^raw" /etc/kdump.conf
}
is_fs_type_nfs()
{
local _fstype=$1
[ $_fstype = "nfs" ] || [ $_fstype = "nfs4" ] && return 0
return 1
}
is_fs_dump_target()
{
egrep -q "^ext[234]|^xfs|^btrfs|^minix" /etc/kdump.conf
}
is_lvm2_thinp_device()
{
_device_path=$1
_lvm2_thin_device=$(lvm lvs -S 'lv_layout=sparse && lv_layout=thin' \
--nosuffix --noheadings -o vg_name,lv_name "$_device_path" 2> /dev/null)
[ -n "$_lvm2_thin_device" ]
}
strip_comments()
{
echo $@ | sed -e 's/\(.*\)#.*/\1/'
}
# Read from kdump config file stripping all comments
read_strip_comments()
{
# strip heading spaces, and print any content starting with
# neither space or #, and strip everything after #
sed -n -e "s/^\s*\([^# \t][^#]\+\).*/\1/gp" $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 $FENCE_KDUMP_SEND ] || return 1
grep -q "^fence_kdump_nodes" /etc/kdump.conf
}
to_dev_name() {
local dev="${1//\"/}"
case "$dev" in
UUID=*)
dev=`blkid -U "${dev#UUID=}"`
;;
LABEL=*)
dev=`blkid -L "${dev#LABEL=}"`
;;
esac
echo $dev
}
is_user_configured_dump_target()
{
return $(is_mount_in_dracut_args || is_ssh_dump_target || is_nfs_dump_target || \
is_raw_dump_target || is_fs_dump_target)
}
get_user_configured_dump_disk()
{
local _target
_target=$(egrep "^ext[234]|^xfs|^btrfs|^minix|^raw" /etc/kdump.conf 2>/dev/null |awk '{print $2}')
[ -n "$_target" ] && echo $_target && return
_target=$(get_dracut_args_target "$(grep "^dracut_args .*\-\-mount" /etc/kdump.conf)")
[ -b "$_target" ] && echo $_target
}
get_root_fs_device()
{
findmnt -k -f -n -o SOURCE /
}
get_save_path()
{
local _save_path=$(awk '$1 == "path" {print $2}' /etc/kdump.conf)
[ -z "$_save_path" ] && _save_path=$DEFAULT_PATH
# strip the duplicated "/"
echo $_save_path | tr -s /
}
get_block_dump_target()
{
local _target _path
if is_ssh_dump_target || is_nfs_dump_target; then
return
fi
_target=$(get_user_configured_dump_disk)
[ -n "$_target" ] && echo $(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" ] && echo $(to_dev_name $_target)
}
is_dump_to_rootfs()
{
grep -E "^(failure_action|default)[[:space:]]dump_to_rootfs" /etc/kdump.conf >/dev/null
}
is_lvm2_thinp_dump_target()
{
_target=$(get_block_dump_target)
[ -n "$_target" ] && is_lvm2_thinp_device "$_target"
}
get_failure_action_target()
{
local _target
if is_dump_to_rootfs; then
# Get rootfs device name
_target=$(get_root_fs_device)
[ -b "$_target" ] && echo $(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" -a "$kdump_targets" != "$_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 $_mntpoint equals to
# $_mntpoint_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 _path=$1
# In case it's a sub path in a mount point, get the mount point first
local _mnt_top=$(df $_path | tail -1 | awk '{print $NF}')
local _mntpoint=$(findmnt $_mnt_top | tail -n 1 | awk '{print $2}')
local _mntpoint_nofsroot=$(findmnt -v $_mnt_top | tail -n 1 | awk '{print $2}')
if [[ "$_mntpoint" = $_mntpoint_nofsroot ]]; then
echo $_path && return
fi
_mntpoint=${_mntpoint#*$_mntpoint_nofsroot}
_mntpoint=${_mntpoint#[}
_mntpoint=${_mntpoint%]}
_path=${_path#$_mnt_top}
echo $_mntpoint$_path
}
# Return the current underlaying device of a path, ignore bind mounts
get_target_from_path()
{
local _target
_target=$(df $1 2>/dev/null | tail -1 | awk '{print $1}')
[[ "$_target" == "/dev/root" ]] && [[ ! -e /dev/root ]] && _target=$(get_root_fs_device)
echo $_target
}
is_mounted()
{
findmnt -k -n $1 &>/dev/null
}
get_mount_info()
{
local _info_type=$1 _src_type=$2 _src=$3; shift 3
local _info=$(findmnt -k -n -r -o $_info_type --$_src_type $_src $@)
[ -z "$_info" ] && [ -e "/etc/fstab" ] && _info=$(findmnt -s -n -r -o $_info_type --$_src_type $_src $@)
echo $_info
}
get_fs_type_from_target()
{
get_mount_info FSTYPE source $1 -f
}
get_mntopt_from_target()
{
get_mount_info OPTIONS source $1 -f
}
# Find the general mount point of a dump target, not the bind mount point
get_mntpoint_from_target()
{
# Expcilitly specify --source to findmnt could ensure non-bind mount is returned
get_mount_info TARGET source $1 -f
}
# Get the path where the target will be mounted in kdump kernel
# $1: kdump target device
get_kdump_mntpoint_from_target()
{
local _mntpoint=$(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 "/"
}
# get_option_value <option_name>
# retrieves value of option defined in kdump.conf
get_option_value() {
strip_comments `grep "^$1[[:space:]]\+" /etc/kdump.conf | tail -1 | cut -d\ -f2-`
}
kdump_get_persistent_dev() {
local dev="${1//\"/}"
case "$dev" in
UUID=*)
dev=`blkid -U "${dev#UUID=}"`
;;
LABEL=*)
dev=`blkid -L "${dev#LABEL=}"`
;;
esac
echo $(get_persistent_dev "$dev")
}
is_ostree()
{
test -f /run/ostree-booted
}
# fixme, try the best to decide whether the ipv6 addr is allocated by slaac or dhcp6
is_ipv6_auto()
{
local _netdev=$1
local _auto=$(cat /proc/sys/net/ipv6/conf/$_netdev/autoconf)
if [ $_auto -eq 1 ]; then
return 0
else
return 1
fi
}
is_ipv6_address()
{
echo $1 | grep -q ":"
}
# 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=`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 ${1} 2>/dev/null | \
awk '{ print toupper(gensub(/.*link\/[^ ]* ([[:alnum:]:]*).*/,
"\\1", 1)); }'
fi
}
get_ifcfg_by_device()
{
grep -E -i -l "^[[:space:]]*DEVICE=\"*${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=<nm_uuid>" and "NAME=<nm_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}"
}
# $1: netdev name
get_ifcfg_legacy()
{
local ifcfg_file
ifcfg_file="/etc/sysconfig/network-scripts/ifcfg-${1}"
[ -f "${ifcfg_file}" ] && echo -n "${ifcfg_file}" && return
ifcfg_file=$(get_ifcfg_by_name "${1}")
[ -f "${ifcfg_file}" ] && echo -n "${ifcfg_file}" && return
local 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 -- $(grep "^dracut_args" /etc/kdump.conf)
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()
{
grep -q "^dracut_args .*\-\-mount" /etc/kdump.conf
}
# If $1 contains dracut_args "--mount", return <filesystem type>
get_dracut_args_fstype()
{
echo $1 | grep "\-\-mount" | sed "s/.*--mount .\(.*\)/\1/" | cut -d' ' -f3
}
# If $1 contains dracut_args "--mount", return <device>
get_dracut_args_target()
{
echo $1 | grep "\-\-mount" | sed "s/.*--mount .\(.*\)/\1/" | cut -d' ' -f1
}
get_reserved_mem_size()
{
local reserved_mem_size=0
if is_fadump_capable; then
reserved_mem_size=$(< /sys/kernel/fadump/mem_reserved)
else
reserved_mem_size=$(< /sys/kernel/kexec_crash_size)
fi
echo "$reserved_mem_size"
}
check_crash_mem_reserved()
{
local mem_reserved
mem_reserved=$(get_reserved_mem_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=`cat /sys/kernel/kexec_crash_loaded`
if [ $rc == 1 ]; then
return 0
else
return 1
fi
}
# remove_cmdline_param <kernel cmdline> <param1> [<param2>] ... [<paramN>]
# 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 <kernel cmdline> <parameter name> <parameter value>
# 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, secure boot is enforced if:
# host secure boot: /ibm,secure-boot/os-secureboot-enforcing DT property exists
# guest secure boot: /ibm,secure-boot >= 2
if [ -f /proc/device-tree/ibm,secureboot/os-secureboot-enforcing ]; then
return 0
fi
if [ -f /proc/device-tree/ibm,secure-boot ] && \
[ $(lsprop /proc/device-tree/ibm,secure-boot | tail -1) -ge 2 ]; then
return 0
fi
# Detect secure boot on x86 and arm64
secure_boot_file=$(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" ] && [ "$setup_mode_byte" = "0" ]; then
return 0
fi
fi
# Detect secure boot on s390x
if [[ -e "/sys/firmware/ipl/secure" && "$(cat /sys/firmware/ipl/secure)" == "1" ]]; then
return 0
fi
return 1
}
#
# prepare_kexec_args <kexec args>
# This function prepares kexec argument.
#
prepare_kexec_args()
{
local kexec_args=$1
local found_elf_args
ARCH=`uname -m`
if [ "$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
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="$kexec_args --elf32-core-headers"
fi
fi
fi
# For secureboot enabled machines, use new kexec file based syscall.
# Old syscall will always fail as it does not have capability to do
# kernel signature verification.
if is_secure_boot_enforced; then
dinfo "Secure Boot is enabled. Using kexec file based syscall."
kexec_args="$kexec_args -s"
fi
echo $kexec_args
}
# prepare_kdump_kernel <kdump_kernelver>
# This function return kdump_kernel given a kernel version.
prepare_kdump_kernel()
{
local kdump_kernelver=$1
local dir img boot_dirlist boot_imglist kdump_kernel machine_id
read -r machine_id < /etc/machine-id
boot_dirlist=${KDUMP_BOOTDIR:-"/boot /boot/efi /efi /"}
boot_imglist="$KDUMP_IMG-$kdump_kernelver$KDUMP_IMG_EXT $machine_id/$kdump_kernelver/$KDUMP_IMG"
# The kernel of OSTree based systems is not in the standard locations.
if is_ostree; then
boot_dirlist="$(echo /boot/ostree/*) $boot_dirlist"
fi
# Use BOOT_IMAGE as reference if possible, strip the GRUB root device prefix in (hd0,gpt1) format
boot_img="$(grep -P -o '^BOOT_IMAGE=(\S+)' /proc/cmdline | sed "s/^BOOT_IMAGE=\((\S*)\)\?\(\S*\)/\2/")"
if [[ "$boot_img" == *"$kdump_kernelver" ]]; 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
echo "$kdump_kernel"
}
#
# 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_initrdlist nondebug_kernelver debug_kernelver
local default_initrd_base var_target_initrd_dir
if [[ -z $KDUMP_KERNELVER ]]; then
KDUMP_KERNELVER=$(uname -r)
# Fadump uses the regular bootloader, unlike kdump. So, use the same version
# for default kernel and capture kernel unless specified explicitly with
# KDUMP_KERNELVER option.
if ! is_fadump_capable; then
nondebug_kernelver=$(sed -n -e 's/\(.*\)+debug$/\1/p' <<< "$KDUMP_KERNELVER")
fi
fi
# Use nondebug kernel if possible, because debug kernel will consume more memory and may oom.
if [[ -n $nondebug_kernelver ]]; then
dinfo "Trying to use $nondebug_kernelver."
debug_kernelver=$KDUMP_KERNELVER
KDUMP_KERNELVER=$nondebug_kernelver
fi
KDUMP_KERNEL=$(prepare_kdump_kernel "$KDUMP_KERNELVER")
if ! [[ -e $KDUMP_KERNEL ]]; then
if [[ -n $debug_kernelver ]]; then
dinfo "Fallback to using debug kernel"
KDUMP_KERNELVER=$debug_kernelver
KDUMP_KERNEL=$(prepare_kdump_kernel "$KDUMP_KERNELVER")
fi
fi
if ! [[ -e $KDUMP_KERNEL ]]; then
derror "Failed to detect kdump kernel location"
return 1
fi
if [[ "$KDUMP_KERNEL" == *"+debug" ]]; then
dwarn "Using debug kernel, you may need to set a larger crashkernel than the default value."
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/$initrd" ]]; then
default_initrd_base="$initrd"
DEFAULT_INITRD="$KDUMP_BOOTDIR/$default_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 $default_initrd_base ]]; then
kdump_initrd_base=initramfs-${KDUMP_KERNELVER}kdump.img
elif [[ $default_initrd_base == *.* ]]; then
kdump_initrd_base=${default_initrd_base%.*}kdump.${DEFAULT_INITRD##*.}
else
kdump_initrd_base=${default_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 <commandline> <commandline remove> <commandline append>
# This function performs a series of edits on the command line.
# Store the final result in global $KDUMP_COMMANDLINE.
prepare_cmdline()
{
local cmdline id
if [ -z "$1" ]; then
cmdline=$(cat /proc/cmdline)
else
cmdline="$1"
fi
# These params should always be removed
cmdline=$(remove_cmdline_param "$cmdline" crashkernel panic_on_warn)
# These params can be removed configurably
cmdline=$(remove_cmdline_param "$cmdline" "$2")
# Always remove "root=X", as we now explicitly generate all kinds
# of dump target mount information including root fs.
#
# We do this before KDUMP_COMMANDLINE_APPEND, if one really cares
# about it(e.g. for debug purpose), then can pass "root=X" using
# KDUMP_COMMANDLINE_APPEND.
cmdline=$(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 [ ! -z ${id} ] ; then
cmdline=$(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
echo ${cmdline}
}
#get system memory size in the unit of GB
get_system_size()
{
result=$(cat /proc/iomem | grep "System RAM" | awk -F ":" '{ print $1 }' | tr [:lower:] [:upper:] | paste -sd+)
result="+$result"
# replace '-' with '+0x' and '+' with '-0x'
sum=$( echo $result | sed -e 's/-/K0x/g' | sed -e 's/+/-0x/g' | sed -e 's/K/+/g' )
size=$(printf "%d\n" $(($sum)))
# in MB unit
let size=$size/1024/1024
# since RHEL-8.5 kernel round up total memory to 128M, so should user space
let size=($size+127)/128
let size=$size*128
# in GB unit
let size=$size/1024
echo $size
}
get_recommend_size()
{
local mem_size=$1
local _ck_cmdline=$2
local OLDIFS="$IFS"
last_sz=""
last_unit=""
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 [ $unit == 'T' ]; then
let size=$size*1024
fi
if [ $mem_size -lt $size ]; then
echo $recommend
IFS="$OLDIFS"
return
fi
done
IFS="$OLDIFS"
}
# return recommended size based on current system RAM size
kdump_get_arch_recommend_size()
{
if ! [[ -r "/proc/iomem" ]] ; then
echo "Error, can not access /proc/iomem."
return 1
fi
arch=$(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 [ $arch == "PPC64LE" ]; then
if is_fadump_capable; then
ck_cmdline="4G-16G:768M,16G-64G:1G,64G-128G:2G,128G-1T:4G,1T-2T:6G,2T-4T:12G,4T-8T:20G,8T-16T:36G,16T-32T:64G,32T-64T:128G,64T-:180G"
else
ck_cmdline="2G-4G:384M,4G-16G:512M,16G-64G:1G,64G-128G:2G,128G-:4G"
fi
fi
ck_cmdline=$(echo $ck_cmdline | sed -e 's/-:/-102400T:/g')
sys_mem=$(get_system_size)
result=$(get_recommend_size $sys_mem "$ck_cmdline")
echo $result
return 0
}
# 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/$1 ]] || return 1
_type=$(blkid -u filesystem,crypto -o export -- "/dev/block/$1" | \
sed -n -E "s/^TYPE=(.*)$/\1/p")
[[ $_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 <device>
# 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 _crypt
for _dev in $(get_block_dump_target); do
_crypt=$(get_luks_crypt_dev $(kdump_get_maj_min "$_dev"))
[[ -n "$_crypt" ]] && echo $_crypt
done
}
check_vmlinux()
{
# Use readelf to check if it's a valid ELF
readelf -h $1 &>/dev/null || return 1
}
get_vmlinux_size()
{
local size=0
while read _type _offset _virtaddr _physaddr _fsize _msize _flg _aln; do
size=$(( $size + $_msize ))
done <<< $(readelf -l -W $1 | grep "^ LOAD" 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 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
for _seg in $(cat /proc/iomem | grep -E "Kernel (code|rodata|data|bss)" | cut -d ":" -f 1); do
_size=$(( $_size + 0x${_seg#*-} - 0x${_seg%-*} ))
done
echo $_size
}
Mini Shell