83 lines
5.0 KiB
Diff
83 lines
5.0 KiB
Diff
commit 4af486794d45adbda7567361d8dcc658599dcd2c
|
|
Author: Johannes Meixner <jsmeix@suse.com>
|
|
Date: Tue Aug 8 14:44:16 2023 +0200
|
|
|
|
Merge pull request #3031 from rear/jsmeix-USB-Secure-Boot
|
|
|
|
Secure Boot support for OUTPUT=USB:
|
|
In output/USB/Linux-i386/100_create_efiboot.sh
|
|
added SECURE_BOOT_BOOTLOADER related code that is based
|
|
on the code in output/ISO/Linux-i386/250_populate_efibootimg.sh
|
|
with some adaptions to make it work within the existing USB code.
|
|
The basic idea for Secure Boot booting of the ReaR recovery system
|
|
is to "just copy" the (signed) EFI binaries of the Linux distribution
|
|
(shim*.efi and grub*.efi as first and second stage UEFI bootloaders)
|
|
instead of let ReaR make its own EFI binary via build_bootx86_efi()
|
|
see https://github.com/rear/rear/pull/3031
|
|
|
|
diff --git a/usr/share/rear/output/USB/Linux-i386/100_create_efiboot.sh b/usr/share/rear/output/USB/Linux-i386/100_create_efiboot.sh
|
|
index f4659306..fd631c44 100644
|
|
--- a/usr/share/rear/output/USB/Linux-i386/100_create_efiboot.sh
|
|
+++ b/usr/share/rear/output/USB/Linux-i386/100_create_efiboot.sh
|
|
@@ -29,6 +29,44 @@ mount $EFI_PART $EFI_MPT || Error "Failed to mount EFI partition '$EFI_PART' at
|
|
mkdir -p $EFI_DST || Error "Failed to create directory '$EFI_DST'"
|
|
|
|
# Copy boot loader
|
|
+# The SECURE_BOOT_BOOTLOADER related code below is based on the code in output/ISO/Linux-i386/250_populate_efibootimg.sh
|
|
+# because I <jsmeix@suse.de> noticed that Secure Boot works with ISO at least for me, cf.
|
|
+# https://github.com/rear/rear/pull/3025#issuecomment-1635876186
|
|
+# but not with USB, cf.
|
|
+# https://github.com/rear/rear/pull/3025#issuecomment-1643774477
|
|
+# so I tried to re-use the ISO Secure Boot code for USB
|
|
+# which made Secure Boot "just work" for me with USB
|
|
+# but I had to do some (minor) adaptions to make it work
|
|
+# within the existing USB code, cf.
|
|
+# https://github.com/rear/rear/pull/3031#issuecomment-1653443454
|
|
+# Copy UEFI bootloader:
|
|
+if test -f "$SECURE_BOOT_BOOTLOADER" ; then
|
|
+ # For a technical description of Shim see https://mjg59.dreamwidth.org/19448.html
|
|
+ # Shim is a signed EFI binary that is a first stage bootloader
|
|
+ # that loads and executes another (signed) EFI binary
|
|
+ # which normally is a second stage bootloader
|
|
+ # which normally is a GRUB EFI binary
|
|
+ # which normally is available as a file named grub*.efi
|
|
+ # so when SECURE_BOOT_BOOTLOADER is used as UEFI_BOOTLOADER
|
|
+ # (cf. rescue/default/850_save_sysfs_uefi_vars.sh)
|
|
+ # then Shim (usually shim.efi) must be copied as EFI/BOOT/BOOTX64.efi
|
|
+ # and Shim's second stage bootloader must be also copied where Shim already is.
|
|
+ DebugPrint "Using '$SECURE_BOOT_BOOTLOADER' as first stage Secure Boot bootloader BOOTX64.efi"
|
|
+ cp -L $v "$SECURE_BOOT_BOOTLOADER" "$EFI_DST/BOOTX64.efi" || Error "Failed to copy SECURE_BOOT_BOOTLOADER '$SECURE_BOOT_BOOTLOADER' to $EFI_DST/BOOTX64.efi"
|
|
+ # When Shim is used, its second stage bootloader can be actually anything
|
|
+ # named grub*.efi (second stage bootloader is Shim compile time option), see
|
|
+ # http://www.rodsbooks.com/efi-bootloaders/secureboot.html#initial_shim
|
|
+ local uefi_bootloader_dirname="$( dirname $SECURE_BOOT_BOOTLOADER )"
|
|
+ local second_stage_UEFI_bootloader_files="$( echo $uefi_bootloader_dirname/grub*.efi )"
|
|
+ # Avoid 'nullglob' pitfall when nothing matches .../grub*.efi which would result
|
|
+ # an invalid "cp -v /var/tmp/.../EFI/BOOT/" command that fails
|
|
+ # cf. https://github.com/rear/rear/issues/1921
|
|
+ test "$second_stage_UEFI_bootloader_files" || Error "Could not find second stage Secure Boot bootloader $uefi_bootloader_dirname/grub*.efi"
|
|
+ DebugPrint "Using second stage Secure Boot bootloader files: $second_stage_UEFI_bootloader_files"
|
|
+ cp -L $v $second_stage_UEFI_bootloader_files $EFI_DST/ || Error "Failed to copy second stage Secure Boot bootloader files"
|
|
+else
|
|
+ cp -L $v "$UEFI_BOOTLOADER" "$EFI_DST/BOOTX64.efi" || Error "Failed to copy UEFI_BOOTLOADER '$UEFI_BOOTLOADER' to $EFI_DST/BOOTX64.efi"
|
|
+fi
|
|
cp $v $UEFI_BOOTLOADER "$EFI_DST/BOOTX64.efi" || Error "Failed to copy UEFI_BOOTLOADER '$UEFI_BOOTLOADER' to $EFI_DST/BOOTX64.efi"
|
|
|
|
# Copy kernel
|
|
@@ -93,7 +131,14 @@ EOF
|
|
create_grub2_cfg ${EFI_DIR}/kernel ${EFI_DIR}/$REAR_INITRD_FILENAME > ${EFI_DST}/grub.cfg
|
|
|
|
# Create bootloader, this overwrite BOOTX64.efi copied in previous step ...
|
|
- build_bootx86_efi ${EFI_DST}/BOOTX64.efi ${EFI_DST}/grub.cfg "/boot" "$UEFI_BOOTLOADER"
|
|
+ # Create BOOTX86.efi but only if we are NOT secure booting.
|
|
+ # We are not able to create signed boot loader
|
|
+ # so we need to reuse existing one.
|
|
+ # See issue #1374
|
|
+ # build_bootx86_efi () can be safely used for other scenarios.
|
|
+ if ! test -f "$SECURE_BOOT_BOOTLOADER" ; then
|
|
+ build_bootx86_efi ${EFI_DST}/BOOTX64.efi ${EFI_DST}/grub.cfg "/boot" "$UEFI_BOOTLOADER"
|
|
+ fi
|
|
;;
|
|
*)
|
|
BugError "Neither grub 0.97 nor 2.0"
|