Fix repeated errors of blacklisting during bootup

[AaronMa]

[Impact]
There are many repeated error of blacklisting during bootup on buggy firmware.
log:
kernel: blacklist: Problem blacklisting hash (-13)

[Fix]
Do not create duplicate entries or update existing entries,
use a warning instead of spurious error messages.

[Test]
Tested on hardware with buggy firmware, error message will be shown as warning.
No impact on normal hardware.

[Where problems could occur]
It may break UEFI boot.
Because this is only error message, no function changed,
SRU for oem-6.1 only.

[Timo Aaltonen (tjaalton)]

please verify oem-6.1 1020.20

[Launchpad Janitor (janitor)]

This bug was fixed in the package linux-oem-6.1 - 6.1.0-1020.20

---------------
linux-oem-6.1 (6.1.0-1020.20) jammy; urgency=medium

  * jammy/linux-oem-6.1: 6.1.0-1020.20 -proposed tracker (LP: #2030594)

  * CVE-2022-40982
    - init: Provide arch_cpu_finalize_init()
    - x86/cpu: Switch to arch_cpu_finalize_init()
    - ARM: cpu: Switch to arch_cpu_finalize_init()
    - ia64/cpu: Switch to arch_cpu_finalize_init()
    - loongarch/cpu: Switch to arch_cpu_finalize_init()
    - m68k/cpu: Switch to arch_cpu_finalize_init()
    - mips/cpu: Switch to arch_cpu_finalize_init()
    - sh/cpu: Switch to arch_cpu_finalize_init()
    - sparc/cpu: Switch to arch_cpu_finalize_init()
    - um/cpu: Switch to arch_cpu_finalize_init()
    - init: Remove check_bugs() leftovers
    - init: Invoke arch_cpu_finalize_init() earlier
    - init, x86: Move mem_encrypt_init() into arch_cpu_finalize_init()
    - x86/init: Initialize signal frame size late
    - x86/fpu: Remove cpuinfo argument from init functions
    - x86/fpu: Mark init functions __init
    - x86/fpu: Move FPU initialization into arch_cpu_finalize_init()
    - x86/speculation: Add Gather Data Sampling mitigation
    - x86/speculation: Add force option to GDS mitigation
    - x86/speculation: Add Kconfig option for GDS
    - KVM: Add GDS_NO support to KVM
    - x86/mem_encrypt: Unbreak the AMD_MEM_ENCRYPT=n build
    - x86/xen: Fix secondary processors' FPU initialization
    - x86/mm: fix poking_init() for Xen PV guests
    - x86/mm: Use mm_alloc() in poking_init()
    - mm: Move mm_cachep initialization to mm_init()
    - x86/mm: Initialize text poking earlier
    - Documentation/x86: Fix backwards on/off logic about YMM support
    - [Config]: Enable CONFIG_ARCH_HAS_CPU_FINALIZE_INIT

  * System freeze after resuming from suspend due to PCI ASPM settings
    (LP: #1980829)
    - SAUCE: PCI/ASPM: Save/restore L1SS Capability for suspend/resume
    - SAUCE: whitelist platforms that needs save/restore ASPM L1SS for
      suspend/resume

  * CVE-2023-20593
    - x86/cpu/amd: Move the errata checking functionality up
    - x86/cpu/amd: Add a Zenbleed fix

  * Fix repeated errors of blacklisting during bootup (LP: #2029363)
    - certs: make blacklisted hash available in klog
    - KEYS: Add new function key_create()
    - certs: don't try to update blacklist keys

  * Fix AMD gpu hang when screen off/on (LP: #2028740)
    - drm/amd/display: Keep PHY active for dp config

  * CVE-2023-4015
    - netfilter: nf_tables: skip immediate deactivate in _PREPARE_ERROR

  * CVE-2023-3995
    - netfilter: nf_tables: disallow rule addition to bound chain via
      NFTA_RULE_CHAIN_ID

  * CVE-2023-3777
    - netfilter: nf_tables: skip bound chain on rule flush

  * CVE-2023-4004
    - netfilter: nft_set_pipapo: fix improper element removal

 -- Timo Aaltonen <email address hidden> Wed, 16 Aug 2023 15:20:53 +0300