Bug#956752: linux-image-rt-amd64: No access to EFI variables possible with rt kernels
Package: linux-image-rt-amd64
Version: 4.19+105+deb10u3
Severity: important
Dear Maintainer,
Using the rt kernel packages (4.19.0-8-rt-amd64 or 5.4.0-0.bpo.4-rt-amd64) no access to
the EFI variables under /sys/firmware/efi/efivars is possible.
With the non-rt kernels, all is fine as shown below:
root@debian:~# uname -a
Linux debian 4.19.0-8-rt-amd64 #1 SMP PREEMPT RT Debian 4.19.98-1 (2020-01-26) x86_64 GNU/Linux
root@debian:~# ls -lR /sys/firmware/efi/
/sys/firmware/efi/:
total 0
-r--r--r-- 1 root root 4096 Apr 15 07:09 config_table
dr-xr-xr-x 2 root root 0 Apr 15 07:09 efivars
-r--r--r-- 1 root root 4096 Apr 15 07:09 fw_platform_size
-r--r--r-- 1 root root 4096 Apr 15 07:09 fw_vendor
-r--r--r-- 1 root root 4096 Apr 15 07:09 runtime
-r-------- 1 root root 4096 Apr 15 07:09 systab
/sys/firmware/efi/efivars:
total 0
root@debian:~# uname -a
Linux debian 5.4.0-0.bpo.4-rt-amd64 #1 SMP PREEMPT_RT Debian 5.4.19-1~bpo10+1 (2020-03-09) x86_64 GNU/Linux
root@debian:~# ls -lR /sys/firmware/efi/
/sys/firmware/efi/:
total 0
-r--r--r-- 1 root root 4096 Apr 15 07:11 config_table
dr-xr-xr-x 2 root root 0 Apr 15 07:10 efivars
-r--r--r-- 1 root root 4096 Apr 15 07:11 fw_platform_size
-r--r--r-- 1 root root 4096 Apr 15 07:11 fw_vendor
-r--r--r-- 1 root root 4096 Apr 15 07:11 runtime
-r-------- 1 root root 4096 Apr 15 07:11 systab
/sys/firmware/efi/efivars:
total 0
root@debian:~# uname -a
Linux debian 4.19.0-8-amd64 #1 SMP Debian 4.19.98-1 (2020-01-26) x86_64 GNU/Linux
root@debian:~# ls -lR /sys/firmware/efi/
/sys/firmware/efi/:
total 0
-r--r--r-- 1 root root 4096 Apr 15 07:06 config_table
drwxr-xr-x 2 root root 0 Apr 15 07:06 efivars
-r--r--r-- 1 root root 4096 Apr 15 07:06 fw_platform_size
-r--r--r-- 1 root root 4096 Apr 15 07:06 fw_vendor
-r--r--r-- 1 root root 4096 Apr 15 07:06 runtime
drwxr-xr-x 7 root root 0 Apr 15 07:06 runtime-map
-r-------- 1 root root 4096 Apr 15 07:06 systab
drwxr-xr-x 83 root root 0 Apr 15 07:06 vars
/sys/firmware/efi/efivars:
total 0
-rw-r--r-- 1 root root 12 Apr 15 07:06 AcpiGlobalVariable-af9ffd67-ec10-488a-9dfc-6cbf5ee22c2e
-rw-r--r-- 1 root root 5 Apr 15 07:06 AoacWakeStatus-23771b23-e15a-4805-920a-4f1e84b54abc
-rw-r--r-- 1 root root 72 Apr 15 07:06 BmEssentialVariableNames-0b7646a4-6b44-4332-8588-c8998117f2ef
-rw-r--r-- 1 root root 46 Apr 15 07:06 Boot0000-8be4df61-93ca-11d2-aa0d-00e098032b8c
-rw-r--r-- 1 root root 54 Apr 15 07:06 Boot0001-8be4df61-93ca-11d2-aa0d-00e098032b8c
-rw-r--r-- 1 root root 70 Apr 15 07:06 Boot0002-8be4df61-93ca-11d2-aa0d-00e098032b8c
-rw-r--r-- 1 root root 68 Apr 15 07:06 Boot0003-8be4df61-93ca-11d2-aa0d-00e098032b8c
-rw-r--r-- 1 root root 66 Apr 15 07:06 Boot0004-8be4df61-93ca-11d2-aa0d-00e098032b8c
-rw-r--r-- 1 root root 68 Apr 15 07:06 Boot0005-8be4df61-93ca-11d2-aa0d-00e098032b8c
-rw-r--r-- 1 root root 70 Apr 15 07:06 Boot0006-8be4df61-93ca-11d2-aa0d-00e098032b8c
-rw-r--r-- 1 root root 66 Apr 15 07:06 Boot0007-8be4df61-93ca-11d2-aa0d-00e098032b8c
-rw-r--r-- 1 root root 71 Apr 15 07:06 Boot0008-8be4df61-93ca-11d2-aa0d-00e098032b8c
-rw-r--r-- 1 root root 71 Apr 15 07:06 Boot0009-8be4df61-93ca-11d2-aa0d-00e098032b8c
-rw-r--r-- 1 root root 71 Apr 15 07:06 Boot000A-8be4df61-93ca-11d2-aa0d-00e098032b8c
-rw-r--r-- 1 root root 71 Apr 15 07:06 Boot000B-8be4df61-93ca-11d2-aa0d-00e098032b8c
-rw-r--r-- 1 root root 71 Apr 15 07:06 Boot000C-8be4df61-93ca-11d2-aa0d-00e098032b8c
-rw-r--r-- 1 root root 71 Apr 15 07:06 Boot000D-8be4df61-93ca-11d2-aa0d-00e098032b8c
-rw-r--r-- 1 root root 73 Apr 15 07:06 Boot000E-8be4df61-93ca-11d2-aa0d-00e098032b8c
-rw-r--r-- 1 root root 64 Apr 15 07:06 Boot000F-8be4df61-93ca-11d2-aa0d-00e098032b8c
-rw-r--r-- 1 root root 68 Apr 15 07:06 Boot0010-8be4df61-93ca-11d2-aa0d-00e098032b8c
-rw-r--r-- 1 root root 72 Apr 15 07:06 Boot0011-8be4df61-93ca-11d2-aa0d-00e098032b8c
-rw-r--r-- 1 root root 74 Apr 15 07:06 Boot0012-8be4df61-93ca-11d2-aa0d-00e098032b8c
-rw-r--r-- 1 root root 68 Apr 15 07:06 Boot0013-8be4df61-93ca-11d2-aa0d-00e098032b8c
-rw-r--r-- 1 root root 134 Apr 15 07:06 Boot0014-8be4df61-93ca-11d2-aa0d-00e098032b8c
-rw-r--r-- 1 root root 6 Apr 15 07:06 BootCurrent-8be4df61-93ca-11d2-aa0d-00e098032b8c
-rw-r--r-- 1 root root 8 Apr 15 07:06 BootOptionSupport-8be4df61-93ca-11d2-aa0d-00e098032b8c
-rw-r--r-- 1 root root 32 Apr 15 07:06 BootOrder-8be4df61-93ca-11d2-aa0d-00e098032b8c
-rw-r--r-- 1 root root 30 Apr 15 07:06 BootOrderDefault-8be4df61-93ca-11d2-aa0d-00e098032b8c
-rw-r--r-- 1 root root 294 Apr 15 07:06 ConIn-8be4df61-93ca-11d2-aa0d-00e098032b8c
-rw-r--r-- 1 root root 50 Apr 15 07:06 ConInDev-8be4df61-93ca-11d2-aa0d-00e098032b8c
-rw-r--r-- 1 root root 34 Apr 15 07:06 ConOut-8be4df61-93ca-11d2-aa0d-00e098032b8c
-rw-r--r-- 1 root root 34 Apr 15 07:06 ConOutDev-8be4df61-93ca-11d2-aa0d-00e098032b8c
-rw-r--r-- 1 root root 5 Apr 15 07:06 CpuCmpSmt-f31bce44-4db9-40fc-93ab-4de140657b91
-rw-r--r-- 1 root root 5 Apr 15 07:06 CpuOnlyReset-0382f3df-35d3-4716-8219-3f6f8275848e
-rw-r--r-- 1 root root 39 Apr 15 07:06 CpuPpiSetupVar-d1b99f1a-084b-49c3-b88e-378abefa118b
-rw-r--r-- 1 root root 5 Apr 15 07:06 CpuRatio-320c081f-b8ca-40ad-a6bf-30211e51ec0e
-rw-r--r-- 1 root root 6 Apr 15 07:06 DIAGSPLSHSCRN-8be4df61-93ca-11d2-aa0d-00e098032b8c
-rw-r--r-- 1 root root 34 Apr 15 07:06 ErrOutDev-8be4df61-93ca-11d2-aa0d-00e098032b8c
-rw-r--r-- 1 root root 12 Apr 15 07:06 FirmwarePerformanceDataTable-9dab39a4-3f8a-47ac-80c3-400729332c81
-rw-r--r-- 1 root root 12 Apr 15 07:06 HDDPWD-8be4df61-93ca-11d2-aa0d-00e098032b8c
-rw-r--r-- 1 root root 624 Apr 15 07:06 IccString-c1e2774b-9ed4-4103-aefa-33b8149eccf6
-rw-r--r-- 1 root root 154 Apr 15 07:06 Key0000-8be4df61-93ca-11d2-aa0d-00e098032b8c
-rw-r--r-- 1 root root 154 Apr 15 07:06 Key0001-8be4df61-93ca-11d2-aa0d-00e098032b8c
-rw-r--r-- 1 root root 166 Apr 15 07:06 Key0002-8be4df61-93ca-11d2-aa0d-00e098032b8c
-rw-r--r-- 1 root root 170 Apr 15 07:06 Key0003-8be4df61-93ca-11d2-aa0d-00e098032b8c
-rw-r--r-- 1 root root 194 Apr 15 07:06 Key0004-8be4df61-93ca-11d2-aa0d-00e098032b8c
-rw-r--r-- 1 root root 166 Apr 15 07:06 Key0005-8be4df61-93ca-11d2-aa0d-00e098032b8c
-rw-r--r-- 1 root root 174 Apr 15 07:06 Key0006-8be4df61-93ca-11d2-aa0d-00e098032b8c
-rw-r--r-- 1 root root 156 Apr 15 07:06 Key0007-8be4df61-93ca-11d2-aa0d-00e098032b8c
-rw-r--r-- 1 root root 194 Apr 15 07:06 Key0008-8be4df61-93ca-11d2-aa0d-00e098032b8c
-rw-r--r-- 1 root root 174 Apr 15 07:06 Key0009-8be4df61-93ca-11d2-aa0d-00e098032b8c
-rw-r--r-- 1 root root 6 Apr 15 07:06 LastBootCurrent-8be4df61-93ca-11d2-aa0d-00e098032b8c
-rw-r--r-- 1 root root 32 Apr 15 07:06 LastBootOrder-0b7646a4-6b44-4332-8588-c8998117f2ef
-rw-r--r-- 1 root root 84 Apr 15 07:06 MemoryTypeInformation-4c19049f-4137-4dd3-9c10-8b97a83ffdfa
-rw-r--r-- 1 root root 84 Apr 15 07:06 MemoryTypeInformationBackup-4c19049f-4137-4dd3-9c10-8b97a83ffdfa
-rw-r--r-- 1 root root 3052 Apr 15 07:06 MemRestoreVariable-608dc793-15de-4a7f-a0c5-6c29beaf5d23
-rw-r--r-- 1 root root 12 Apr 15 07:06 MrcScramblerVar-200fd2d9-27f0-4055-977c-8b3b600d79c4
-rw-r--r-- 1 root root 8 Apr 15 07:06 MTC-eb704011-1402-11d3-8e77-00a0c969723b
-rw-r--r-- 1 root root 26 Apr 15 07:06 OpromDevicePath-8be4df61-93ca-11d2-aa0d-00e098032b8c
-rw-r--r-- 1 root root 12 Apr 15 07:06 OsIndications-8be4df61-93ca-11d2-aa0d-00e098032b8c
-rw-r--r-- 1 root root 12 Apr 15 07:06 OsIndicationsSupported-8be4df61-93ca-11d2-aa0d-00e098032b8c
-rw-r--r-- 1 root root 16 Apr 15 07:06 PbaStatusVar-0ec1a7f5-4904-40a0-8eab-4bcc4666da45
-rw-r--r-- 1 root root 8 Apr 15 07:06 PchInit-e6c2f70a-b604-4877-85ba-deec89e117eb
-rw-r--r-- 1 root root 20 Apr 15 07:06 PchS3Peim-e6c2f70a-b604-4877-85ba-deec89e117eb
-rw-r--r-- 1 root root 10 Apr 15 07:06 PlatformLang-8be4df61-93ca-11d2-aa0d-00e098032b8c
-rw-r--r-- 1 root root 28 Apr 15 07:06 PlatformLangCodes-8be4df61-93ca-11d2-aa0d-00e098032b8c
-rw-r--r-- 1 root root 7 Apr 15 07:06 PlatformOpRomSetup-65827a61-99e2-4f07-a7aa-0b1f98edad39
-rw-r--r-- 1 root root 30 Apr 15 07:06 ProtectedBootOptions-8be4df61-93ca-11d2-aa0d-00e098032b8c
-rw-r--r-- 1 root root 28 Apr 15 07:06 SaPegData-c4975200-64f1-4fb6-9773-f6a9f89d985e
-rw-r--r-- 1 root root 187 Apr 15 07:06 SaPpiSetupVar-7da81437-866b-4143-8e08-a25c6ef0fa5b
-rw-r--r-- 1 root root 5 Apr 15 07:06 ScramblerSeedCmosLocation-8be7835f-ade6-4bed-9777-3ec4ce1f6044
-rw-r--r-- 1 root root 52 Apr 15 07:06 SctHotkey-4650c401-93f1-4aeb-b87d-c8204c047dec
-rw-r--r-- 1 root root 265 Apr 15 07:06 Setup-4dfbbaab-1392-4fde-abb8-c41cc5ad7d5d
-rw-r--r-- 1 root root 35 Apr 15 07:06 SioPolicy-729c67cc-e109-4bc7-97b5-fa7c386e387d
-rw-r--r-- 1 root root 12 Apr 15 07:06 SMBIOSEPS-c3eeae98-23bf-412b-ab60-efcbb48e1534
-rw-r--r-- 1 root root 7 Apr 15 07:06 Time-470733de-df43-448b-8b45-4eeb0df8c812
-rw-r--r-- 1 root root 6 Apr 15 07:06 Timeout-8be4df61-93ca-11d2-aa0d-00e098032b8c
-rw-r--r-- 1 root root 7 Apr 15 07:06 TpmAcpiData-6403753b-abde-4da2-aa11-6983ef2a7a69
-rw-r--r-- 1 root root 5 Apr 15 07:06 TpmSaveState-5e724c0c-5c03-4543-bcb6-c1e23de24136
-rw-r--r-- 1 root root 31 Apr 15 07:06 XtuFactoryDefVar-354f0446-1ed7-4f6c-88ee-7dffcf012e0b
-rw-r--r-- 1 root root 32 Apr 15 07:06 XtuNv7-96fc61f6-e3bb-4f82-e096-c9c8a1bcd192
-- System Information:
Debian Release: 10.3
APT prefers stable-updates
APT policy: (500, 'stable-updates'), (500, 'stable')
Architecture: amd64 (x86_64)
Kernel: Linux 5.4.0-0.bpo.4-rt-amd64 (SMP w/4 CPU cores; PREEMPT)
Locale: LANG=en_US.UTF-8, LC_CTYPE=en_US.UTF-8 (charmap=UTF-8), LANGUAGE=en_US:en (charmap=UTF-8)
Shell: /bin/sh linked to /usr/bin/dash
Init: systemd (via /run/systemd/system)
LSM: AppArmor: enabled
Versions of packages linux-image-rt-amd64 depends on:
ii linux-image-4.19.0-8-rt-amd64 4.19.98-1
linux-image-rt-amd64 recommends no packages.
linux-image-rt-amd64 suggests no packages.
-- no debconf information
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