Bionic update to v4.15.4 stable release

SRU Justification

    Impact:
       The upstream process for stable tree updates is quite similar
       in scope to the Ubuntu SRU process, e.g., each patch has to
       demonstrably fix a bug, and each patch is vetted by upstream
       by originating either directly from a mainline/stable Linux tree or
       a minimally backported form of that patch. The v4.15.4 upstream stable
       patch set is now available. It should be included in the Ubuntu
       kernel as well.

       git://git.kernel.org/

    TEST CASE: TBD

       The following patches from the v4.15.4 stable release shall be applied:

watchdog: indydog: Add dependency on SGI_HAS_INDYDOG
cifs: Fix missing put_xid in cifs_file_strict_mmap
cifs: Fix autonegotiate security settings mismatch
CIFS: zero sensitive data when freeing
cpufreq: mediatek: add mediatek related projects into blacklist
dmaengine: dmatest: fix container_of member in dmatest_callback
ssb: Do not disable PCI host on non-Mips
watchdog: gpio_wdt: set WDOG_HW_RUNNING in gpio_wdt_stop
Revert "drm/i915: mark all device info struct with __initconst"
sched/rt: Use container_of() to get root domain in rto_push_irq_work_func()
sched/rt: Up the root domain ref count when passing it around via IPIs
media: dvb-usb-v2: lmedm04: Improve logic checking of warm start
media: dvb-usb-v2: lmedm04: move ts2020 attach to dm04_lme2510_tuner
media: hdpvr: Fix an error handling path in hdpvr_probe()
arm64: mm: Use non-global mappings for kernel space
arm64: mm: Temporarily disable ARM64_SW_TTBR0_PAN
arm64: mm: Move ASID from TTBR0 to TTBR1
arm64: mm: Remove pre_ttbr0_update_workaround for Falkor erratum #E1003
arm64: mm: Rename post_ttbr0_update_workaround
arm64: mm: Fix and re-enable ARM64_SW_TTBR0_PAN
arm64: mm: Allocate ASIDs in pairs
arm64: mm: Add arm64_kernel_unmapped_at_el0 helper
arm64: mm: Invalidate both kernel and user ASIDs when performing TLBI
arm64: entry: Add exception trampoline page for exceptions from EL0
arm64: mm: Map entry trampoline into trampoline and kernel page tables
arm64: entry: Explicitly pass exception level to kernel_ventry macro
arm64: entry: Hook up entry trampoline to exception vectors
arm64: erratum: Work around Falkor erratum #E1003 in trampoline code
arm64: cpu_errata: Add Kryo to Falkor 1003 errata
arm64: tls: Avoid unconditional zeroing of tpidrro_el0 for native tasks
arm64: entry: Add fake CPU feature for unmapping the kernel at EL0
arm64: kaslr: Put kernel vectors address in separate data page
arm64: use RET instruction for exiting the trampoline
arm64: Kconfig: Add CONFIG_UNMAP_KERNEL_AT_EL0
arm64: Kconfig: Reword UNMAP_KERNEL_AT_EL0 kconfig entry
arm64: Take into account ID_AA64PFR0_EL1.CSV3
arm64: capabilities: Handle duplicate entries for a capability
arm64: mm: Introduce TTBR_ASID_MASK for getting at the ASID in the TTBR
arm64: kpti: Fix the interaction between ASID switching and software PAN
arm64: cputype: Add MIDR values for Cavium ThunderX2 CPUs
arm64: Turn on KPTI only on CPUs that need it
arm64: kpti: Make use of nG dependent on arm64_kernel_unmapped_at_el0()
arm64: mm: Permit transitioning from Global to Non-Global without BBM
arm64: kpti: Add ->enable callback to remap swapper using nG mappings
arm64: Force KPTI to be disabled on Cavium ThunderX
arm64: entry: Reword comment about post_ttbr_update_workaround
arm64: idmap: Use "awx" flags for .idmap.text .pushsection directives
perf: arm_spe: Fail device probe when arm64_kernel_unmapped_at_el0()
arm64: barrier: Add CSDB macros to control data-value prediction
arm64: Implement array_index_mask_nospec()
arm64: Make USER_DS an inclusive limit
arm64: Use pointer masking to limit uaccess speculation
arm64: entry: Ensure branch through syscall table is bounded under speculation
arm64: uaccess: Prevent speculative use of the current addr_limit
arm64: uaccess: Don't bother eliding access_ok checks in __{get, put}_user
arm64: uaccess: Mask __user pointers for __arch_{clear, copy_*}_user
arm64: futex: Mask __user pointers prior to dereference
arm64: cpufeature: __this_cpu_has_cap() shouldn't stop early
arm64: Run enable method for errata work arounds on late CPUs
arm64: cpufeature: Pass capability structure to ->enable callback
drivers/firmware: Expose psci_get_version through psci_ops structure
arm64: Move post_ttbr_update_workaround to C code
arm64: Add skeleton to harden the branch predictor against aliasing attacks
arm64: Move BP hardening to check_and_switch_context
arm64: KVM: Use per-CPU vector when BP hardening is enabled
arm64: entry: Apply BP hardening for high-priority synchronous exceptions
arm64: entry: Apply BP hardening for suspicious interrupts from EL0
arm64: cputype: Add missing MIDR values for Cortex-A72 and Cortex-A75
arm64: Implement branch predictor hardening for affected Cortex-A CPUs
arm64: Implement branch predictor hardening for Falkor
arm64: Branch predictor hardening for Cavium ThunderX2
arm64: KVM: Increment PC after handling an SMC trap
arm/arm64: KVM: Consolidate the PSCI include files
arm/arm64: KVM: Add PSCI_VERSION helper
arm/arm64: KVM: Add smccc accessors to PSCI code
arm/arm64: KVM: Implement PSCI 1.0 support
arm/arm64: KVM: Advertise SMCCC v1.1
arm64: KVM: Make PSCI_VERSION a fast path
arm/arm64: KVM: Turn kvm_psci_version into a static inline
arm64: KVM: Report SMCCC_ARCH_WORKAROUND_1 BP hardening support
arm64: KVM: Add SMCCC_ARCH_WORKAROUND_1 fast handling
firmware/psci: Expose PSCI conduit
firmware/psci: Expose SMCCC version through psci_ops
arm/arm64: smccc: Make function identifiers an unsigned quantity
arm/arm64: smccc: Implement SMCCC v1.1 inline primitive
arm64: Add ARM_SMCCC_ARCH_WORKAROUND_1 BP hardening support
arm64: Kill PSCI_GET_VERSION as a variant-2 workaround
mtd: cfi: convert inline functions to macros
mtd: nand: brcmnand: Disable prefetch by default
mtd: nand: Fix nand_do_read_oob() return value
mtd: nand: sunxi: Fix ECC strength choice
ubi: Fix race condition between ubi volume creation and udev
ubi: fastmap: Erase outdated anchor PEBs during attach
ubi: block: Fix locking for idr_alloc/idr_remove
ubifs: free the encrypted symlink target
nfs/pnfs: fix nfs_direct_req ref leak when i/o falls back to the mds
nfs41: do not return ENOMEM on LAYOUTUNAVAILABLE
NFS: Add a cond_resched() to nfs_commit_release_pages()
NFS: Fix nfsstat breakage due to LOOKUPP
NFS: commit direct writes even if they fail partially
NFS: reject request for id_legacy key without auxdata
NFS: Fix a race between mmap() and O_DIRECT
nfsd: Detect unhashed stids in nfsd4_verify_open_stid()
kernfs: fix regression in kernfs_fop_write caused by wrong type
ahci: Annotate PCI ids for mobile Intel chipsets as such
ahci: Add PCI ids for Intel Bay Trail, Cherry Trail and Apollo Lake AHCI
ahci: Add Intel Cannon Lake PCH-H PCI ID
crypto: hash - introduce crypto_hash_alg_has_setkey()
crypto: cryptd - pass through absence of ->setkey()
crypto: mcryptd - pass through absence of ->setkey()
crypto: poly1305 - remove ->setkey() method
crypto: hash - annotate algorithms taking optional key
crypto: hash - prevent using keyed hashes without setting key
media: v4l2-ioctl.c: use check_fmt for enum/g/s/try_fmt
media: v4l2-ioctl.c: don't copy back the result for -ENOTTY
media: v4l2-compat-ioctl32.c: add missing VIDIOC_PREPARE_BUF
media: v4l2-compat-ioctl32.c: fix the indentation
media: v4l2-compat-ioctl32.c: move 'helper' functions to __get/put_v4l2_format32
media: v4l2-compat-ioctl32.c: avoid sizeof(type)
media: v4l2-compat-ioctl32.c: copy m.userptr in put_v4l2_plane32
media: v4l2-compat-ioctl32.c: fix ctrl_is_pointer
media: v4l2-compat-ioctl32.c: copy clip list in put_v4l2_window32
media: v4l2-compat-ioctl32.c: drop pr_info for unknown buffer type
media: v4l2-compat-ioctl32.c: don't copy back the result for certain errors
media: v4l2-compat-ioctl32.c: refactor compat ioctl32 logic
media: v4l2-compat-ioctl32.c: make ctrl_is_pointer work for subdevs
crypto: caam - fix endless loop when DECO acquire fails
crypto: sha512-mb - initialize pending lengths correctly
crypto: talitos - fix Kernel Oops on hashing an empty file
arm: KVM: Fix SMCCC handling of unimplemented SMC/HVC calls
KVM: nVMX: Fix races when sending nested PI while dest enters/leaves L2
KVM: nVMX: Fix bug of injecting L2 exception into L1
KVM: PPC: Book3S HV: Make sure we don't re-enter guest without XIVE loaded
KVM: PPC: Book3S HV: Drop locks before reading guest memory
KVM: arm/arm64: Handle CPU_PM_ENTER_FAILED
KVM: PPC: Book3S PR: Fix broken select due to misspelling
ASoC: acpi: fix machine driver selection based on quirk
ASoC: rockchip: i2s: fix playback after runtime resume
ASoC: skl: Fix kernel warning due to zero NHTL entry
ASoC: compress: Correct handling of copy callback
watchdog: imx2_wdt: restore previous timeout after suspend+resume
afs: Add missing afs_put_cell()
afs: Need to clear responded flag in addr cursor
afs: Fix missing cursor clearance
afs: Fix server list handling
btrfs: Handle btrfs_set_extent_delalloc failure in fixup worker
Btrfs: raid56: iterate raid56 internal bio with bio_for_each_segment_all
kasan: don't emit builtin calls when sanitization is off
kasan: rework Kconfig settings
media: dvb_frontend: be sure to init dvb_frontend_handle_ioctl() return code
media: dvb-frontends: fix i2c access helpers for KASAN
media: dt-bindings/media/cec-gpio.txt: mention the CEC/HPD max voltages
media: ts2020: avoid integer overflows on 32 bit machines
media: vivid: fix module load error when enabling fb and no_error_inj=1
media: cxusb, dib0700: ignore XC2028_I2C_FLUSH
fs/proc/kcore.c: use probe_kernel_read() instead of memcpy()
kernel/async.c: revert "async: simplify lowest_in_progress()"
kernel/relay.c: revert "kernel/relay.c: fix potential memory leak"
pipe: actually allow root to exceed the pipe buffer limits
pipe: fix off-by-one error when checking buffer limits
HID: quirks: Fix keyboard + touchpad on Toshiba Click Mini not working
Bluetooth: btsdio: Do not bind to non-removable BCM43341
ipmi: use dynamic memory for DMI driver override
signal/openrisc: Fix do_unaligned_access to send the proper signal
signal/sh: Ensure si_signo is initialized in do_divide_error
alpha: fix crash if pthread_create races with signal delivery
alpha: osf_sys.c: fix put_tv32 regression
alpha: Fix mixed up args in EXC macro in futex operations
alpha: fix reboot on Avanti platform
alpha: fix formating of stack content
xtensa: fix futex_atomic_cmpxchg_inatomic
EDAC, octeon: Fix an uninitialized variable warning
genirq: Make legacy autoprobing work again
pinctrl: intel: Initialize GPIO properly when used through irqchip
pinctrl: mcp23s08: fix irq setup order
pinctrl: sx150x: Unregister the pinctrl on release
pinctrl: sx150x: Register pinctrl before adding the gpiochip
pinctrl: sx150x: Add a static gpio/pinctrl pin range mapping
pktcdvd: Fix pkt_setup_dev() error path
pktcdvd: Fix a recently introduced NULL pointer dereference
blk-mq: quiesce queue before freeing queue
clocksource/drivers/stm32: Fix kernel panic with multiple timers
lib/ubsan.c: s/missaligned/misaligned/
lib/ubsan: add type mismatch handler for new GCC/Clang
objtool: Fix switch-table detection
arm64: dts: marvell: add Ethernet aliases
drm/i915: Avoid PPS HW/SW state mismatch due to rounding
ACPI: sbshc: remove raw pointer from printk() message
acpi, nfit: fix register dimm error handling
ovl: force r/o mount when index dir creation fails
ovl: fix failure to fsync lower dir
ovl: take mnt_want_write() for work/index dir setup
ovl: take mnt_want_write() for removing impure xattr
ovl: hash directory inodes for fsnotify
mn10300/misalignment: Use SIGSEGV SEGV_MAPERR to report a failed user copy
devpts: fix error handling in devpts_mntget()
ftrace: Remove incorrect setting of glob search field
scsi: core: Ensure that the SCSI error handler gets woken up
scsi: lpfc: Fix crash after bad bar setup on driver attachment
scsi: cxlflash: Reset command ioasc
rcu: Export init_rcu_head() and destroy_rcu_head() to GPL modules
Linux 4.15.4

       The following patches from the v4.15.4 stable release had already been applied:

Revert "Bluetooth: btusb: fix QCA Rome suspend/resume"
Bluetooth: btusb: Restore QCA Rome suspend/resume fix with a "rewritten" version