Debian's arm64 UEFI Secure Boot shim makes the EFI variable store run
out of space while mirroring its MOK database to variables. This can be
observed in QEMU like so:
$ tools/buildman/buildman -o build/qemu_arm64 --boards=qemu_arm64 -w
$ cd build/qemu_arm64
$ curl -L -o debian.iso \
https://cdimage.debian.org/debian-cd/current/arm64/iso-cd/debian-12.0.0-arm64-netinst.iso
$ qemu-system-aarch64 \
-nographic -bios u-boot.bin \
-machine virt -cpu cortex-a53 -m 1G -smp 2 \
-drive
if=virtio,file=debian.iso,index=0,format=raw,readonly=on,media=cdrom
[...]
=> # interrupt autoboot
=> env set -e -bs -nv -rt -guid 605dab50-e046-4300-abb6-3dd810dd8b23
SHIM_VERBOSE 1
=> boot
[...]
mok.c:296:mirror_one_esl() SetVariable("MokListXRT43", ... varsz=0x4C) = Out
of Resources
mok.c:452:mirror_mok_db() esd:0x7DB92D20 adj:0x30
Failed to set MokListXRT: Out of Resources
mok.c:767:mirror_one_mok_variable() mirror_mok_db("MokListXRT",
datasz=17328) returned Out of Resources
mok.c:812:mirror_one_mok_variable() returning Out of Resources
Could not create MokListXRT: Out of Resources
[...]
Welcome to GRUB!
This would normally be fine as shim would continue to run grubaa64.efi,
but shim's error handling code for this case has a bug [1] that causes a
synchronous abort on at least chromebook_kevin (but apparently not on
QEMU arm64).
Double the default variable store size so the variables fit. There is a
note about this value matching PcdFlashNvStorageVariableSize when
EFI_MM_COMM_TEE is enabled, so keep the old default in that case.
[1] https://github.com/rhboot/shim/pull/577
Signed-off-by: Alper Nebi Yasak <[email protected]>
---
I'm not very familiar with EFI things, apologies if this default
should not be changed (consider this a bug report in that case).
lib/efi_loader/Kconfig | 5 +++--
1 file changed, 3 insertions(+), 2 deletions(-)
diff --git a/lib/efi_loader/Kconfig b/lib/efi_loader/Kconfig
index c5835e6ef61a..0660d1174902 100644
--- a/lib/efi_loader/Kconfig
+++ b/lib/efi_loader/Kconfig
@@ -96,7 +96,8 @@ endif
config EFI_VAR_BUF_SIZE
int "Memory size of the UEFI variable store"
- default 16384
+ default 16384 if EFI_MM_COMM_TEE
+ default 32768
range 4096 2147483647
help
This defines the size in bytes of the memory area reserved for keeping
@@ -106,7 +107,7 @@ config EFI_VAR_BUF_SIZE
match the value of PcdFlashNvStorageVariableSize used to compile the
StandAloneMM module.
- Minimum 4096, default 16384.
+ Minimum 4096, default 32768, or 16384 when using StandAloneMM.
config EFI_GET_TIME
bool "GetTime() runtime service"
--
2.40.1
