From a698240df0c43278b2d1d7259c8e7a6926c63112 Mon Sep 17 00:00:00 2001 From: "Matthew S. Turnbull" Date: Sat, 24 Feb 2018 17:44:58 -0500 Subject: [PATCH] grub-mkconfig/10_linux: Support multiple early initrd images Add support for multiple, shared, early initrd images. These early images will be loaded in the order declared, and all will be loaded before the initrd image. While many classes of data can be provided by early images, the immediate use case would be for distributions to provide CPU microcode to mitigate the Meltdown and Spectre vulnerabilities. There are two environment variables provided for declaring the early images. * GRUB_EARLY_INITRD_LINUX_STOCK is for the distribution declare images that are provided by the distribution or installed packages. If undeclared, this will default to a set of common microcode image names. * GRUB_EARLY_INITRD_LINUX_CUSTOM is for user created images. User images will be loaded after the stock images. These separate configurations allow the distribution and user to declare different image sets without clobbering each other. This also makes a minor update to ensure that UUID partition labels stay disabled when no initrd image is found, even if early images are present. This is a continuation of a previous patch published by Christian Hesse in 2016: http://lists.gnu.org/archive/html/grub-devel/2016-02/msg00025.html Down stream Gentoo bug: https://bugs.gentoo.org/645088 Signed-off-by: Robin H. Johnson Signed-off-by: Matthew S. Turnbull Reviewed-by: Daniel Kiper --- docs/grub.texi | 19 +++++++++++++++++++ util/grub-mkconfig.in | 8 ++++++++ util/grub.d/10_linux.in | 33 +++++++++++++++++++++++++++------ 3 files changed, 54 insertions(+), 6 deletions(-) diff --git a/docs/grub.texi b/docs/grub.texi index 137b894fa..65b4bbeda 100644 --- a/docs/grub.texi +++ b/docs/grub.texi @@ -1398,6 +1398,25 @@ for all respectively normal entries. The values of these options replace the values of @samp{GRUB_CMDLINE_LINUX} and @samp{GRUB_CMDLINE_LINUX_DEFAULT} for Linux and Xen menu entries. +@item GRUB_EARLY_INITRD_LINUX_CUSTOM +@itemx GRUB_EARLY_INITRD_LINUX_STOCK +List of space-separated early initrd images to be loaded from @samp{/boot}. +This is for loading things like CPU microcode, firmware, ACPI tables, crypto +keys, and so on. These early images will be loaded in the order declared, +and all will be loaded before the actual functional initrd image. + +@samp{GRUB_EARLY_INITRD_LINUX_STOCK} is for your distribution to declare +images that are provided by the distribution. It should not be modified +without understanding the consequences. They will be loaded first. + +@samp{GRUB_EARLY_INITRD_LINUX_CUSTOM} is for your custom created images. + +The default stock images are as follows, though they may be overridden by +your distribution: +@example +intel-uc.img intel-ucode.img amd-uc.img amd-ucode.img early_ucode.cpio microcode.cpio +@end example + @item GRUB_DISABLE_LINUX_UUID Normally, @command{grub-mkconfig} will generate menu entries that use universally-unique identifiers (UUIDs) to identify the root filesystem to diff --git a/util/grub-mkconfig.in b/util/grub-mkconfig.in index f8496d28b..35ef583b0 100644 --- a/util/grub-mkconfig.in +++ b/util/grub-mkconfig.in @@ -147,6 +147,12 @@ if [ x"$GRUB_FS" = xunknown ]; then GRUB_FS="$(stat -f --printf=%T / || echo unknown)" fi +# Provide a default set of stock linux early initrd images. +# Define here so the list can be modified in the sourced config file. +if [ "x${GRUB_EARLY_INITRD_LINUX_STOCK}" = "x" ]; then + GRUB_EARLY_INITRD_LINUX_STOCK="intel-uc.img intel-ucode.img amd-uc.img amd-ucode.img early_ucode.cpio microcode.cpio" +fi + if test -f ${sysconfdir}/default/grub ; then . ${sysconfdir}/default/grub fi @@ -211,6 +217,8 @@ export GRUB_DEFAULT \ GRUB_CMDLINE_NETBSD \ GRUB_CMDLINE_NETBSD_DEFAULT \ GRUB_CMDLINE_GNUMACH \ + GRUB_EARLY_INITRD_LINUX_CUSTOM \ + GRUB_EARLY_INITRD_LINUX_STOCK \ GRUB_TERMINAL_INPUT \ GRUB_TERMINAL_OUTPUT \ GRUB_SERIAL_COMMAND \ diff --git a/util/grub.d/10_linux.in b/util/grub.d/10_linux.in index de9044c7f..faedf74e1 100644 --- a/util/grub.d/10_linux.in +++ b/util/grub.d/10_linux.in @@ -136,9 +136,13 @@ EOF if test -n "${initrd}" ; then # TRANSLATORS: ramdisk isn't identifier. Should be translated. message="$(gettext_printf "Loading initial ramdisk ...")" + initrd_path= + for i in ${initrd}; do + initrd_path="${initrd_path} ${rel_dirname}/${i}" + done sed "s/^/$submenu_indentation/" << EOF echo '$(echo "$message" | grub_quote)' - initrd ${rel_dirname}/${initrd} + initrd $(echo $initrd_path) EOF fi sed "s/^/$submenu_indentation/" << EOF @@ -188,7 +192,15 @@ while [ "x$list" != "x" ] ; do alt_version=`echo $version | sed -e "s,\.old$,,g"` linux_root_device_thisversion="${LINUX_ROOT_DEVICE}" - initrd= + initrd_early= + for i in ${GRUB_EARLY_INITRD_LINUX_STOCK} \ + ${GRUB_EARLY_INITRD_LINUX_CUSTOM}; do + if test -e "${dirname}/${i}" ; then + initrd_early="${initrd_early} ${i}" + fi + done + + initrd_real= for i in "initrd.img-${version}" "initrd-${version}.img" "initrd-${version}.gz" \ "initrd-${version}" "initramfs-${version}.img" \ "initrd.img-${alt_version}" "initrd-${alt_version}.img" \ @@ -198,11 +210,22 @@ while [ "x$list" != "x" ] ; do "initramfs-genkernel-${GENKERNEL_ARCH}-${version}" \ "initramfs-genkernel-${GENKERNEL_ARCH}-${alt_version}"; do if test -e "${dirname}/${i}" ; then - initrd="$i" + initrd_real="${i}" break fi done + initrd= + if test -n "${initrd_early}" || test -n "${initrd_real}"; then + initrd="${initrd_early} ${initrd_real}" + + initrd_display= + for i in ${initrd}; do + initrd_display="${initrd_display} ${dirname}/${i}" + done + gettext_printf "Found initrd image: %s\n" "$(echo $initrd_display)" >&2 + fi + config= for i in "${dirname}/config-${version}" "${dirname}/config-${alt_version}" "/etc/kernels/kernel-config-${version}" ; do if test -e "${i}" ; then @@ -216,9 +239,7 @@ while [ "x$list" != "x" ] ; do initramfs=`grep CONFIG_INITRAMFS_SOURCE= "${config}" | cut -f2 -d= | tr -d \"` fi - if test -n "${initrd}" ; then - gettext_printf "Found initrd image: %s\n" "${dirname}/${initrd}" >&2 - elif test -z "${initramfs}" ; then + if test -z "${initramfs}" && test -z "${initrd_real}" ; then # "UUID=" and "ZFS=" magic is parsed by initrd or initramfs. Since there's # no initrd or builtin initramfs, it can't work here. linux_root_device_thisversion=${GRUB_DEVICE}