Disable unprivileged BPF by default

This bug was fixed in the package linux - 5.4.0-104.118

---------------
linux (5.4.0-104.118) focal; urgency=medium

  * CVE-2022-23960
    - SAUCE: kvm: arm: fix build on 32-bit

linux (5.4.0-103.117) focal; urgency=medium

  * CVE-2022-23960
    - arm64: Add part number for Arm Cortex-A77
    - arm64: Add Neoverse-N2, Cortex-A710 CPU part definition
    - arm64: Add Cortex-X2 CPU part definition
    - arm64: add ID_AA64ISAR2_EL1 sys register
    - SAUCE: arm64: entry.S: Add ventry overflow sanity checks
    - SAUCE: arm64: entry: Make the trampoline cleanup optional
    - SAUCE: arm64: entry: Free up another register on kpti's tramp_exit path
    - SAUCE: arm64: entry: Move the trampoline data page before the text page
    - SAUCE: arm64: entry: Allow tramp_alias to access symbols after the 4K
      boundary
    - SAUCE: arm64: entry: Don't assume tramp_vectors is the start of the vectors
    - SAUCE: arm64: entry: Move trampoline macros out of ifdef'd section
    - SAUCE: arm64: entry: Make the kpti trampoline's kpti sequence optional
    - SAUCE: arm64: entry: Allow the trampoline text to occupy multiple pages
    - SAUCE: arm64: entry: Add non-kpti __bp_harden_el1_vectors for mitigations
    - SAUCE: arm64: entry: Add vectors that have the bhb mitigation sequences
    - SAUCE: arm64: entry: Add macro for reading symbol addresses from the
      trampoline
    - SAUCE: arm64: Add percpu vectors for EL1
    - SAUCE: arm64: proton-pack: Report Spectre-BHB vulnerabilities as part of
      Spectre-v2
    - SAUCE: KVM: arm64: Add templates for BHB mitigation sequences
    - SAUCE: arm64: Mitigate spectre style branch history side channels
    - SAUCE: KVM: arm64: Allow SMCCC_ARCH_WORKAROUND_3 to be discovered and
      migrated
    - SAUCE: arm64: Use the clearbhb instruction in mitigations
    - [Config]: set CONFIG_MITIGATE_SPECTRE_BRANCH_HISTORY=y

  * CVE-2022-25636
    - netfilter: nf_tables_offload: incorrect flow offload action array size

  * CVE-2022-0001
    - x86/speculation: Merge one test in spectre_v2_user_select_mitigation()
    - x86,bugs: Unconditionally allow spectre_v2=retpoline,amd
    - SAUCE: x86/speculation: Rename RETPOLINE_AMD to RETPOLINE_LFENCE
    - SAUCE: x86/speculation: Add eIBRS + Retpoline options
    - SAUCE: Documentation/hw-vuln: Update spectre doc

  * Disable unprivileged BPF by default (LP: #1961338)
    - bpf: Add kconfig knob for disabling unpriv bpf by default
    - [Config] set CONFIG_BPF_UNPRIV_DEFAULT_OFF=y

 -- Thadeu Lima de Souza Cascardo <email address hidden> Wed, 02 Mar 2022 14:10:18 -0300

This bug was fixed in the package linux - 4.15.0-171.180

---------------
linux (4.15.0-171.180) bionic; urgency=medium

  * CVE-2022-0001
    - cpu/SMT: create and export cpu_smt_possible()
    - x86/speculation: Merge one test in spectre_v2_user_select_mitigation()
    - x86,bugs: Unconditionally allow spectre_v2=retpoline,amd
    - SAUCE: x86/speculation: Rename RETPOLINE_AMD to RETPOLINE_LFENCE
    - SAUCE: x86/speculation: Add eIBRS + Retpoline options
    - SAUCE: Documentation/hw-vuln: Update spectre doc

  * Disable unprivileged BPF by default (LP: #1961338)
    - bpf: Add kconfig knob for disabling unpriv bpf by default
    - [Config] set CONFIG_BPF_UNPRIV_DEFAULT_OFF=y

 -- Thadeu Lima de Souza Cascardo <email address hidden> Wed, 02 Mar 2022 13:21:15 -0300

The fix for this bug has been awaiting testing feedback in the -proposed repository for focal for more than 90 days. Please test this fix and update the bug appropriately with the results. In the event that the fix for this bug is still not verified 15 days from now, the package will be removed from the -proposed repository.

This bug is awaiting verification that the linux-xilinx-zynqmp/5.4.0-1018.21 kernel in -proposed solves the problem. Please test the kernel and update this bug with the results. If the problem is solved, change the tag 'verification-needed-focal' to 'verification-done-focal'. If the problem still exists, change the tag 'verification-needed-focal' to 'verification-failed-focal'.

If verification is not done by 5 working days from today, this fix will be dropped from the source code, and this bug will be closed.

See https://wiki.ubuntu.com/Testing/EnableProposed for documentation how to enable and use -proposed. Thank you!