Add -fcf-protection=none when using retpoline flags

This bug is awaiting verification that the 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-bionic' to 'verification-done-bionic'. If the problem still exists, change the tag 'verification-needed-bionic' to 'verification-failed-bionic'.

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!

This bug is awaiting verification that the 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-disco' to 'verification-done-disco'. If the problem still exists, change the tag 'verification-needed-disco' to 'verification-failed-disco'.

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!

Running kernel 5.0.0-31-generic in a Eoan install I get the following error when I try to install lttng-modules-dkms:

 CC [M] /var/lib/dkms/lttng-modules/2.10.8/build/lib/ringbuffer/ring_buffer_backend.o
In file included from ./include/linux/export.h:45,
                 from ./include/linux/linkage.h:7,
                 from ./include/linux/kernel.h:7,
                 from ./include/linux/list.h:9,
                 from ./include/linux/module.h:9,
                 from /var/lib/dkms/lttng-modules/2.10.8/build/lib/ringbuffer/ring_buffer_backend.c:2
2:
./include/linux/compiler.h: In function ‘__read_once_size’:
./include/linux/compiler.h:192:1: error: ‘-mindirect-branch’ and ‘-fcf-protection’ are not compatible
  192 | {
      | ^

With kernel 5.0.0-32-generic the modules are built and loaded successfully.

Therefore I'm marking verification-done for Disco.

Confirmed to be also fixed with Bionic kernel. Fails with 4.15.0-65, fixed with 4.15.0-66.

This bug was fixed in the package linux - 5.0.0-32.34

---------------
linux (5.0.0-32.34) disco; urgency=medium

  * disco/linux: 5.0.0-32.34 -proposed tracker (LP: #1846097)

  * CVE-2019-14814 // CVE-2019-14815 // CVE-2019-14816
    - mwifiex: Fix three heap overflow at parsing element in cfg80211_ap_settings

  * CVE-2019-15505
    - media: technisat-usb2: break out of loop at end of buffer

  * CVE-2019-2181
    - binder: check for overflow when alloc for security context

  * Support Hi1620 zip hw accelerator (LP: #1845355)
    - [Config] Enable HiSilicon QM/ZIP as modules
    - crypto: hisilicon - add queue management driver for HiSilicon QM module
    - crypto: hisilicon - add hardware SGL support
    - crypto: hisilicon - add HiSilicon ZIP accelerator support
    - crypto: hisilicon - add SRIOV support for ZIP
    - Documentation: Add debugfs doc for hisi_zip
    - crypto: hisilicon - add debugfs for ZIP and QM
    - MAINTAINERS: add maintainer for HiSilicon QM and ZIP controller driver
    - crypto: hisilicon - fix kbuild warnings
    - crypto: hisilicon - add dependency for CRYPTO_DEV_HISI_ZIP
    - crypto: hisilicon - init curr_sgl_dma to fix compile warning
    - crypto: hisilicon - add missing single_release
    - crypto: hisilicon - fix error handle in hisi_zip_create_req_q
    - crypto: hisilicon - Fix warning on printing %p with dma_addr_t
    - crypto: hisilicon - Fix return value check in hisi_zip_acompress()
    - crypto: hisilicon - avoid unused function warning

  * xfrm interface: several kernel panic (LP: #1836261)
    - xfrm interface: fix memory leak on creation
    - xfrm interface: avoid corruption on changelink
    - xfrm interface: ifname may be wrong in logs
    - xfrm interface: fix list corruption for x-netns
    - xfrm interface: fix management of phydev

  * shiftfs: drop entries from cache on unlink (LP: #1841977)
    - SAUCE: shiftfs: fix buggy unlink logic

  * shiftfs: mark kmem_cache as reclaimable (LP: #1842059)
    - SAUCE: shiftfs: mark slab objects SLAB_RECLAIM_ACCOUNT

  * Suspend to RAM(S3) does not wake up for latest megaraid and mpt3sas
    adapters(SAS3.5 onwards) (LP: #1838751)
    - PCI: Restore Resizable BAR size bits correctly for 1MB BARs

  * No sound inputs from the external microphone and headset on a Dell machine
    (LP: #1842265)
    - ALSA: hda - Expand pin_match function to match upcoming new tbls
    - ALSA: hda - Define a fallback_pin_fixup_tbl for alc269 family

  * Add -fcf-protection=none when using retpoline flags (LP: #1843291)
    - SAUCE: kbuild: add -fcf-protection=none when using retpoline flags

  * Disco update: upstream stable patchset 2019-09-25 (LP: #1845390)
    - bridge/mdb: remove wrong use of NLM_F_MULTI
    - cdc_ether: fix rndis support for Mediatek based smartphones
    - ipv6: Fix the link time qualifier of 'ping_v6_proc_exit_net()'
    - isdn/capi: check message length in capi_write()
    - ixgbe: Fix secpath usage for IPsec TX offload.
    - net: Fix null de-reference of device refcount
    - net: gso: Fix skb_segment splat when splitting gso_size mangled skb having
      linear-headed frag_list
    - net: phylink: Fix flow control resolution
    - net: s...

This bug was fixed in the package linux - 4.15.0-66.75

---------------
linux (4.15.0-66.75) bionic; urgency=medium

  * bionic/linux: 4.15.0-66.75 -proposed tracker (LP: #1846131)

  * Packaging resync (LP: #1786013)
    - [Packaging] update helper scripts

  * CVE-2018-21008
    - rsi: add fix for crash during assertions

  * ipv6: fix neighbour resolution with raw socket (LP: #1834465)
    - ipv6: constify rt6_nexthop()
    - ipv6: fix neighbour resolution with raw socket

  * run_netsocktests from net in ubuntu_kernel_selftests failed with X-4.15
    (LP: #1842023)
    - SAUCE: selftests: net: replace AF_MAX with INT_MAX in socket.c

  * No sound inputs from the external microphone and headset on a Dell machine
    (LP: #1842265)
    - ALSA: hda - Expand pin_match function to match upcoming new tbls
    - ALSA: hda - Define a fallback_pin_fixup_tbl for alc269 family

  * Add -fcf-protection=none when using retpoline flags (LP: #1843291)
    - SAUCE: kbuild: add -fcf-protection=none when using retpoline flags

  * Enhanced Hardware Support - Finalize Naming (LP: #1842774)
    - s390: add support for IBM z15 machines

  * Bionic update: upstream stable patchset 2019-09-24 (LP: #1845266)
    - bridge/mdb: remove wrong use of NLM_F_MULTI
    - cdc_ether: fix rndis support for Mediatek based smartphones
    - ipv6: Fix the link time qualifier of 'ping_v6_proc_exit_net()'
    - isdn/capi: check message length in capi_write()
    - net: Fix null de-reference of device refcount
    - net: gso: Fix skb_segment splat when splitting gso_size mangled skb having
      linear-headed frag_list
    - net: phylink: Fix flow control resolution
    - sch_hhf: ensure quantum and hhf_non_hh_weight are non-zero
    - sctp: Fix the link time qualifier of 'sctp_ctrlsock_exit()'
    - sctp: use transport pf_retrans in sctp_do_8_2_transport_strike
    - tcp: fix tcp_ecn_withdraw_cwr() to clear TCP_ECN_QUEUE_CWR
    - tipc: add NULL pointer check before calling kfree_rcu
    - tun: fix use-after-free when register netdev failed
    - btrfs: compression: add helper for type to string conversion
    - btrfs: correctly validate compression type
    - Revert "MIPS: SiByte: Enable swiotlb for SWARM, LittleSur and BigSur"
    - gpiolib: acpi: Add gpiolib_acpi_run_edge_events_on_boot option and blacklist
    - gpio: fix line flag validation in linehandle_create
    - gpio: fix line flag validation in lineevent_create
    - Btrfs: fix assertion failure during fsync and use of stale transaction
    - genirq: Prevent NULL pointer dereference in resend_irqs()
    - KVM: s390: Do not leak kernel stack data in the KVM_S390_INTERRUPT ioctl
    - KVM: x86: work around leak of uninitialized stack contents
    - KVM: nVMX: handle page fault in vmread
    - MIPS: VDSO: Prevent use of smp_processor_id()
    - MIPS: VDSO: Use same -m%-float cflag as the kernel proper
    - powerpc: Add barrier_nospec to raw_copy_in_user()
    - drm/meson: Add support for XBGR8888 & ABGR8888 formats
    - clk: rockchip: Don't yell about bad mmc phases when getting
    - mtd: rawnand: mtk: Fix wrongly assigned OOB buffer pointer issue
    - PCI: Always allow probing with driver_override
    - ubifs: Cor...

All autopkgtests for the newly accepted linux-bluefield (5.0.0-1003.12) for bionic have finished running.
The following regressions have been reported in tests triggered by the package:

fsprotect/unknown (armhf)

Please visit the excuses page listed below and investigate the failures, proceeding afterwards as per the StableReleaseUpdates policy regarding autopkgtest regressions [1].

https://people.canonical.com/~ubuntu-archive/proposed-migration/bionic/update_excuses.html#linux-bluefield

[1] https://wiki.ubuntu.com/StableReleaseUpdates#Autopkgtest_Regressions

Thank you!