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