mirror of https://github.com/hak5/openwrt.git
kexec-tools: bump version and add support for crashdump kernel
split kexec-tools into two packages, kexec and kdump. * kexec to simply execute a new kernel * kdump is for loading and collecting debris of a crashed kernel with support for kdump forensics. In order to properly support booting into a crashkernel, an init script as well as UCI configuration has been added. As modifying the kernel cmdline is required for this to work in x86 platforms use an uci-defaults script to modify /boot/grub/grub.cfg. To test collecting crash information, use the 'c' sysrq-trigger, ie. echo c > /proc/sysrq-trigger This should result in the crash kernel being executed and (depending on the configution) dmesg and/or vmcore getting saved. To check if the crash kernel was loaded properly, use the 'status' command of the kdump init script. Signed-off-by: Daniel Golle <daniel@makrotopia.org>openwrt-18.06
Daniel Golle
parent
8b486ec2b5
commit
5e4bb476c0
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@ -1,12 +1,5 @@
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menu "Configuration"
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depends on PACKAGE_kexec-tools
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config KEXEC_TOOLS_kdump
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bool
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prompt "kdump support"
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default n
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help
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Include the kdump utility.
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depends on PACKAGE_kexec
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config KEXEC_ZLIB
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bool
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@ -8,12 +8,12 @@
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include $(TOPDIR)/rules.mk
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PKG_NAME:=kexec-tools
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PKG_VERSION:=2.0.14-rc1
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PKG_VERSION:=2.0.14
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PKG_RELEASE:=1
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PKG_SOURCE:=$(PKG_NAME)-$(PKG_VERSION).tar.xz
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PKG_SOURCE_URL:=@KERNEL/linux/utils/kernel/kexec
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PKG_HASH:=3fc505ff8d8a2d24c68aac5e6b4783997d5a086966ff3de8b05a0ceb27e5e23b
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PKG_HASH:=ffb2e7e99d9d08754c6bc1922aed3c000094f318665d82a72ecc76c4ff1c0dc6
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PKG_FIXUP:=autoreconf
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@ -21,22 +21,49 @@ PKG_CONFIG_DEPENDS := CONFIG_KEXEC_ZLIB CONFIG_KEXEC_LZMA
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include $(INCLUDE_DIR)/package.mk
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define Package/kexec-tools
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define Package/kexec-tools/Default
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SECTION:=utils
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CATEGORY:=Utilities
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DEPENDS:=@armeb||@arm||@i386||@x86_64||@powerpc64||@mipsel||@mips +KEXEC_ZLIB:zlib +KEXEC_LZMA:liblzma
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TITLE:=Kernel boots kernel
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URL:=http://kernel.org/pub/linux/kernel/people/horms/kexec-tools/
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MAINTAINER:=Florian Fainelli <florian@openwrt.org>
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MENU:=1
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endef
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define Package/kexec-tools
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$(call Package/kexec-tools/Default)
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TITLE:=kexec-tools transition meta package
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DEPENDS:=+kexec
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endef
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define Package/kexec-tools/description
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kexec is a set of systems call that allows you to load
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kexec is a set of system calls that allows you to load
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another kernel from the currently executing Linux kernel.
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The kexec utility allows to load and boot another kernel.
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endef
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define Package/kexec-tools/config
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define Package/kexec
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$(call Package/kexec-tools/Default)
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TITLE:=Kernel boots kernel
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DEPENDS:=\
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@armeb||@arm||@i386||@x86_64||@powerpc64||@mipsel||@mips \
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+KEXEC_ZLIB:zlib +KEXEC_LZMA:liblzma @KERNEL_KEXEC
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endef
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define Package/kexec/description
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The kexec utility allows to load and boot another kernel.
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endef
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define Package/kdump
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$(call Package/kexec-tools/Default)
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TITLE:=Kernel crash analysis
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DEPENDS:=+kexec @i386||@x86_64||@arm @KERNEL_CRASH_DUMP
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endef
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define Package/kdump/description
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The kdump package allows to automatically boot into a
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special kernel for analyzing kernel crashes using kdump.
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endef
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define Package/kexec/config
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source "$(SOURCE)/Config.in"
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endef
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@ -65,24 +92,45 @@ CONFIGURE_VARS += \
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BUILD_CC="$(HOSTCC)" \
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TARGET_CC="$(TARGET_CC)"
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kexec-extra-sbin-$(CONFIG_KEXEC_TOOLS_kdump) += kdump
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define Build/Compile
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$(MAKE) -C $(PKG_BUILD_DIR) DESTDIR="$(PKG_INSTALL_DIR)" all install
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endef
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define Package/kexec-tools/install
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:
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endef
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define Package/kexec/install
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$(INSTALL_DIR) $(1)/usr/sbin
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$(INSTALL_BIN) \
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$(addprefix $(PKG_INSTALL_DIR)/usr/sbin/, \
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$(kexec-extra-sbin-y)) \
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$(kexec-extra-bin-y) \
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$(PKG_INSTALL_DIR)/usr/sbin/kexec \
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$(1)/usr/sbin
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$(INSTALL_BIN) $(PKG_INSTALL_DIR)/usr/sbin/kexec $(1)/usr/sbin
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# make a link for compatability with other distros
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$(INSTALL_DIR) $(1)/sbin
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$(LN) ../usr/sbin/kexec $(1)/sbin/kexec
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endef
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define Package/kdump/install
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$(INSTALL_DIR) $(1)/usr/sbin $(1)/etc/init.d $(1)/etc/config $(1)/etc/uci-defaults
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$(INSTALL_BIN) $(PKG_INSTALL_DIR)/usr/sbin/kdump $(PKG_INSTALL_DIR)/usr/sbin/vmcore-dmesg $(1)/usr/sbin
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$(INSTALL_BIN) ./files/kdump.init $(1)/etc/init.d/kdump
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$(INSTALL_BIN) ./files/kdump.defaults $(1)/etc/uci-defaults/kdump
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$(INSTALL_CONF) ./files/kdump.config $(1)/etc/config/kdump
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endef
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define Package/kdump/prerm
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#!/bin/sh
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case $$(uname -m) in
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i?86|x86_64)
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if grep -q " crashkernel=" /boot/grub/grub.cfg; then
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mount /boot -o remount,rw
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sed -i 's/ crashkernel=[^ ]*//' /boot/grub/grub.cfg
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mount /boot -o remount,ro
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fi
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;;
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esac
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endef
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$(eval $(call BuildPackage,kexec-tools))
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$(eval $(call BuildPackage,kexec))
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$(eval $(call BuildPackage,kdump))
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@ -0,0 +1,7 @@
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config kdump
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option enabled '1'
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option save_dmesg '1'
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option save_vmcore '0'
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# using an external partition to store vmcore is highly recommended!
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# option path '/mnt/crashdump'
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@ -0,0 +1,11 @@
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#!/bin/sh
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case $(uname -m) in
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i?86|x86_64)
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if ! grep -q crashkernel /boot/grub/grub.cfg; then
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mount /boot -o remount,rw
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sed -i 's/linux.*/& crashkernel=32M@32M/' /boot/grub/grub.cfg
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mount /boot -o remount,ro
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fi
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;;
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esac
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@ -0,0 +1,182 @@
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#!/bin/sh /etc/rc.common
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START=41
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STOP=98
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EXTRA_COMMANDS="status"
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EXTRA_HELP=" status Print crashkernel status"
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verify_kdump() {
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local cfg="$1"
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local enabled
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local path
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local save_vmcore
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local save_dmesg
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config_get_bool enabled "$cfg" enabled 1
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config_get_bool save_dmesg "$cfg" save_dmesg 1
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config_get_bool save_vmcore "$cfg" save_vmcore 0
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[ "$enabled" -gt 0 ] || return 2
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[ "$save_dmesg" -gt 0 ] || [ "$save_vmcore" -gt 0 ] || return 2
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config_get path "$cfg" path "/"
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[ -d "$path" ] || mkdir -p "$path" 2>/dev/null || return 1
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}
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run_kdump() {
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local cfg="$1"
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local enabled
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local path
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local save_vmcore
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local save_dmesg
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config_get_bool enabled "$cfg" enabled 1
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[ "$enabled" -gt 0 ] || return
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config_get_bool save_dmesg "$cfg" save_dmesg 1
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config_get_bool save_vmcore "$cfg" save_vmcore 0
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config_get path "$cfg" path "/"
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timestamp=$(date "+%Y%m%dT%H%M%S")
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if [ "$save_vmcore" -eq 1 ]; then
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# would like 'sparse' but busybox doesn't support it
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dd if=/proc/vmcore of="$path/vmcore-$timestamp" conv=fsync bs=1M
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fi
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if [ "$save_dmesg" -eq 1 ]; then
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vmcore-dmesg /proc/vmcore > "$path/dmesg-$timestamp"
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fi
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sync
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reboot -f
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}
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find_kernel() {
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. /lib/functions.sh
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local kernel
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kernel="$BOOT_IMAGE"
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if [ -r "$kernel" ]; then
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echo $kernel
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return 0
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fi
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kernel="$(find_mtd_part kernel)"
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if [ -r "$kernel" ]; then
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echo $kernel
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return 0
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fi
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for voldir in /sys/class/ubi/ubi*_*; do
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[ ! -e "$voldir" ] && continue
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if [ "$(cat "${voldir}/name")" = "kernel" ]; then
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kernel="/dev/$(basename "$voldir")"
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echo $kernel
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return 0
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fi
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done
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return 1
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}
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load_crashkernel() {
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local append_cmdline
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local kernel
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kernel="$(find_kernel)"
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[ $? -gt 0 ] && return 1
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case "$(uname -m)" in
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i?86|x86_64)
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grep -q "crashkernel=" /proc/cmdline || return 1
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append_cmdline="1 irqpoll reset_devices maxcpus=1"
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;;
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arm*)
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append_cmdline="1 maxcpus=1 reset_devices"
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;;
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esac
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kexec -p "$kernel" --reuse-cmdline --append="$append_cmdline"
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return $?
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}
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start() {
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local retval
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if [ ! -e /sys/kernel/kexec_crash_loaded ]; then
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return 1
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fi
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if [ -e /proc/vmcore ]; then
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config_load kdump
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config_foreach run_kdump kdump
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else
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config_load kdump
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config_foreach verify_kdump kdump
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retval=$?
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[ $retval = 1 ] && return 1
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[ $retval = 0 ] && load_crashkernel
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return $?
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fi
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}
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stop() {
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[ "$(cat /sys/kernel/kexec_crash_loaded)" = "1" ] || return
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if [ -e "$BOOT_IMAGE" ]; then
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kexec -p -u "$BOOT_IMAGE"
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fi
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}
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status() {
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local retval kernel
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if [ ! -e /sys/kernel/kexec_crash_loaded ]; then
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echo "crashdump not supported by kernel"
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return
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fi
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if [ $(cat /sys/kernel/kexec_crash_size) -eq 0 ]; then
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echo "memory for crashdump kernel not reserved!"
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echo "check crashkernel= kernel cmdline parameter"
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echo "(a reboot is required after installing kdump)"
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return
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fi
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kernel="$(find_kernel)"
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if [ $? -gt 0 ]; then
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echo "cannot find kernel image"
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return
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else
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echo "using kernel image $kernel"
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fi
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echo -n "kdump configuration is "
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config_load kdump
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retval=$?
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if [ $retval = 0 ]; then
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if [ "$(config_foreach echo kdump)" ]; then
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config_foreach verify_kdump kdump
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retval=$?
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else
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retval=1
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fi
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fi
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if [ $retval = 0 ]; then
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echo "valid"
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elif [ $retval = 2 ]; then
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echo "disabled"
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else
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echo "BROKEN"
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fi
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echo -n "kexec crash kernel "
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if [ "$(cat /sys/kernel/kexec_crash_loaded)" = "0" ]; then
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echo -n "not "
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fi
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echo "loaded"
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}
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