Xenial update to 4.4.112 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 4.4.112 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 4.4.112 stable release shall be applied:
* dm bufio: fix shrinker scans when (nr_to_scan < retain_target)
* KVM: Fix stack-out-of-bounds read in write_mmio
* can: gs_usb: fix return value of the "set_bittiming" callback
* IB/srpt: Disable RDMA access by the initiator
* MIPS: Validate PR_SET_FP_MODE prctl(2) requests against the ABI of the task
* MIPS: Factor out NT_PRFPREG regset access helpers
* MIPS: Guard against any partial write attempt with PTRACE_SETREGSET
* MIPS: Consistently handle buffer counter with PTRACE_SETREGSET
* MIPS: Fix an FCSR access API regression with NT_PRFPREG and MSA
* MIPS: Also verify sizeof `elf_fpreg_t' with PTRACE_SETREGSET
* MIPS: Disallow outsized PTRACE_SETREGSET NT_PRFPREG regset accesses
* net/mac80211/debugfs.c: prevent build failure with CONFIG_UBSAN=y
* kvm: vmx: Scrub hardware GPRs at VM-exit
* x86/vsdo: Fix build on PARAVIRT_CLOCK=y, KVM_GUEST=n
* x86/acpi: Handle SCI interrupts above legacy space gracefully
* iommu/arm-smmu-v3: Don't free page table ops twice
* ALSA: pcm: Remove incorrect snd_BUG_ON() usages
* ALSA: pcm: Add missing error checks in OSS emulation plugin builder
* ALSA: pcm: Abort properly at pending signal in OSS read/write loops
* ALSA: pcm: Allow aborting mutex lock at OSS read/write loops
* ALSA: aloop: Release cable upon open error path
* ALSA: aloop: Fix inconsistent format due to incomplete rule
* ALSA: aloop: Fix racy hw constraints adjustment
* x86/acpi: Reduce code duplication in mp_override_legacy_irq()
* mm/compaction: fix invalid free_pfn and compact_cached_free_pfn
* mm/compaction: pass only pageblock aligned range to pageblock_pfn_to_page
* mm/page-writeback: fix dirty_ratelimit calculation
* mm/zswap: use workqueue to destroy pool
* zswap: don't param_set_charp while holding spinlock
* locks: don't check for race with close when setting OFD lock
* futex: Replace barrier() in unqueue_me() with READ_ONCE()
* locking/mutex: Allow next waiter lockless wakeup
* usbvision fix overflow of interfaces array
* usb: musb: ux500: Fix NULL pointer dereference at system PM
* r8152: fix the wake event
* r8152: use test_and_clear_bit
* r8152: adjust ALDPS function
* lan78xx: use skb_cow_head() to deal with cloned skbs
* sr9700: use skb_cow_head() to deal with cloned skbs
* smsc75xx: use skb_cow_head() to deal with cloned skbs
* cx82310_eth: use skb_cow_head() to deal with cloned skbs
* x86/mm/pat, /dev/mem: Remove superfluous error message
* hwrng: core - sleep interruptible in read
* sysrq: Fix warning in sysrq generated crash.
* xhci: Fix ring leak in failure path of xhci_alloc_virt_device()
* Revert "userfaultfd: selftest: vm: allow to build in vm/ directory"
* x86/pti/efi: broken conversion from efi to kernel page table
* 8021q: fix a memory leak for VLAN 0 device
* ip6_tunnel: disable dst caching if tunnel is dual-stack
* net: core: fix module type in sock_diag_bind
* RDS: Heap OOB write in rds_message_alloc_sgs()
* RDS: null pointer dereference in rds_atomic_free_op
* sh_eth: fix TSU resource handling
* sh_eth: fix SH7757 GEther initialization
* net: stmmac: enable EEE in MII, GMII or RGMII only
* ipv6: fix possible mem leaks in ipv6_make_skb()
* crypto: algapi - fix NULL dereference in crypto_remove_spawns()
* rbd: set max_segments to USHRT_MAX
* x86/microcode/intel: Extend BDW late-loading with a revision check
* KVM: x86: Add memory barrier on vmcs field lookup
* drm/vmwgfx: Potential off by one in vmw_view_add()
* kaiser: Set _PAGE_NX only if supported
* bpf: add bpf_patch_insn_single helper
* bpf: don't (ab)use instructions to store state
* bpf: move fixup_bpf_calls() function
* bpf: refactor fixup_bpf_calls()
* bpf: adjust insn_aux_data when patching insns
* bpf: prevent out-of-bounds speculation
* bpf, array: fix overflow in max_entries and undefined behavior in index_mask
* iscsi-target: Make TASK_REASSIGN use proper se_cmd->cmd_kref
* target: Avoid early CMD_T_PRE_EXECUTE failures during ABORT_TASK
* USB: serial: cp210x: add IDs for LifeScan OneTouch Verio IQ
* USB: serial: cp210x: add new device ID ELV ALC 8xxx
* usb: misc: usb3503: make sure reset is low for at least 100us
* USB: fix usbmon BUG trigger
* usbip: remove kernel addresses from usb device and urb debug msgs
* staging: android: ashmem: fix a race condition in ASHMEM_SET_SIZE ioctl
* Bluetooth: Prevent stack info leak from the EFS element.
* uas: ignore UAS for Norelsys NS1068(X) chips
* e1000e: Fix e1000_check_for_copper_link_ich8lan return value.
* x86/Documentation: Add PTI description
* x86/cpu: Factor out application of forced CPU caps
* x86/cpufeatures: Make CPU bugs sticky
* x86/cpufeatures: Add X86_BUG_CPU_INSECURE
* x86/pti: Rename BUG_CPU_INSECURE to BUG_CPU_MELTDOWN
* x86/cpufeatures: Add X86_BUG_SPECTRE_V[12]
* x86/cpu: Merge bugs.c and bugs_64.c
* sysfs/cpu: Add vulnerability folder
* x86/cpu: Implement CPU vulnerabilites sysfs functions
* sysfs/cpu: Fix typos in vulnerability documentation
* x86/alternatives: Fix optimize_nops() checking
* x86/alternatives: Add missing '\n' at end of ALTERNATIVE inline asm
* selftests/x86: Add test_vsyscall
* Linux 4.4.112