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[Launchpad Bug Tracker <1398596@xxxxxxxxxxxxxxxxxx>]

This bug was fixed in the package linux - 3.13.0-44.73

---------------
linux (3.13.0-44.73) trusty; urgency=low

  [ Kamal Mostafa ]

  * Release Tracking Bug
    - LP: #1402872

  [ AceLan Kao ]

  * SAUCE: Add use_native_backlight quirk for HP ProBook 6570b
    - LP: #1359010

  [ Andy Whitcroft ]

  * Revert "SAUCE: (no-up) arm64: optimized copy_to_user and copy_from_user
    assembly code"
    - LP: #1398596
  * [Config] updateconfigs to balance CONFIG_SCOM_DEBUGFS

  [ Upstream Kernel Changes ]

  * iwlwifi: mvm: fix merge damage
    - LP: #1393317
  * iwlwifi: remove IWL_UCODE_TLV_FLAGS_SCHED_SCAN flag
    - LP: #1393317
  * iwlwifi: mvm: disable scheduled scan to prevent firmware crash
    - LP: #1393317
  * iwlwifi: mvm: enable scheduled scan on newest firmware
    - LP: #1393317
  * x86: kvm: use alternatives for VMCALL vs. VMMCALL if kernel text is
    read-only
    - LP: #1379340
  * phylib: introduce PHY_INTERFACE_MODE_XGMII for 10G PHY
    - LP: #1381084
  * of: make of_get_phy_mode parse 'phy-connection-type'
    - LP: #1381084
  * xen-netfront: Remove BUGs on paged skb data which crosses a page
    boundary
    - LP: #1275879
  * ACPI / blacklist: blacklist Win8 OSI for Dell Vostro 3546
    - LP: #1383589
  * powerpc/pseries: Fix endiannes issue in RTAS call from xmon
    - LP: #1396235
  * mmc: sdhci-pci-o2micro: Fix Dell E5440 issue
    - LP: #1346067
  * mfd: rtsx: Fix PM suspend for 5227 & 5249
    - LP: #1359052
  * drivers:scsi:storvsc: Fix a bug in handling ring buffer failures that
    may result in I/O freeze
    - LP: #1400289
  * arm64: optimized copy_to_user and copy_from_user assembly code
    - LP: #1400349
  * net:socket: set msg_namelen to 0 if msg_name is passed as NULL in
    msghdr struct from userland.
    - LP: #1335478
  * drm/radeon: initialize sadb to NULL in the audio code
    - LP: #1402714
  * powerpc/vphn: NUMA node code expects big-endian
    - LP: #1401150
  * ALSA: usb-audio: Fix device_del() sysfs warnings at disconnect
    - LP: #1402853
  * ALSA: hda - Add mute LED pin quirk for HP 15 touchsmart
    - LP: #1334950, #1402853
  * rcu: Make callers awaken grace-period kthread
    - LP: #1402853
  * rcu: Use rcu_gp_kthread_wake() to wake up grace period kthreads
    - LP: #1402853
  * net: sctp: fix NULL pointer dereference in af->from_addr_param on
    malformed packet
    - LP: #1402853
  * KVM: x86: Don't report guest userspace emulation error to userspace
    - LP: #1402853
  * [media] ttusb-dec: buffer overflow in ioctl
    - LP: #1402853
  * arm64: __clear_user: handle exceptions on strb
    - LP: #1402853
  * ARM: pxa: fix hang on startup with DEBUG_LL
    - LP: #1402853
  * samsung-laptop: Add broken-acpi-video quirk for NC210/NC110
    - LP: #1402853
  * acer-wmi: Add Aspire 5741 to video_vendor_dmi_table
    - LP: #1402853
  * acer-wmi: Add acpi_backlight=video quirk for the Acer KAV80
    - LP: #1402853
  * rbd: Fix error recovery in rbd_obj_read_sync()
    - LP: #1402853
  * [media] ds3000: fix LNB supply voltage on Tevii S480 on initialization
    - LP: #1402853
  * powerpc: do_notify_resume can be called with bad thread_info flags
    argument
    - LP: #1402853
  * USB: kobil_sct: fix non-atomic allocation in write path
    - LP: #1402853
  * USB: opticon: fix non-atomic allocation in write path
    - LP: #1402853
  * regulator: max77693: Fix use of uninitialized regulator config
    - LP: #1402853
  * USB: cdc-acm: add device id for GW Instek AFG-2225
    - LP: #1402853
  * usb: Do not allow usb_alloc_streams on unconfigured devices
    - LP: #1402853
  * usb-storage: handle a skipped data phase
    - LP: #1402853
  * xhci: Switch only Intel Lynx Point-LP ports to EHCI on shutdown.
    - LP: #1402853
  * xhci: no switching back on non-ULT Haswell
    - LP: #1402853
  * of: Fix overflow bug in string property parsing functions
    - LP: #1402853
  * spi: fsl-dspi: Fix CTAR selection
    - LP: #1402853
  * Btrfs: fix kfree on list_head in btrfs_lookup_csums_range error cleanup
    - LP: #1402853
  * staging:iio:ade7758: Fix NULL pointer deref when enabling buffer
    - LP: #1402853
  * staging:iio:ade7758: Fix check if channels are enabled in prenable
    - LP: #1402853
  * staging:iio:ade7758: Remove "raw" from channel name
    - LP: #1402853
  * USB: cdc-acm: only raise DTR on transitions from B0
    - LP: #1402853
  * serial: Fix divide-by-zero fault in uart_get_divisor()
    - LP: #1402853
  * tty: Fix high cpu load if tty is unreleaseable
    - LP: #1402853
  * tty: Prevent "read/write wait queue active!" log flooding
    - LP: #1402853
  * tty/vt: don't set font mappings on vc not supporting this
    - LP: #1402853
  * spi: pxa2xx: toggle clocks on suspend if not disabled by runtime PM
    - LP: #1402853
  * sysfs: driver core: Fix glue dir race condition by gdp_mutex
    - LP: #1402853
  * i2c: at91: don't account as iowait
    - LP: #1402853
  * nfsd: don't try to reuse an expired DRC entry off the list
    - LP: #1402853
  * nfsd: don't halt scanning the DRC LRU list when there's an RC_INPROG
    entry
    - LP: #1402853
  * dm bufio: change __GFP_IO to __GFP_FS in shrinker callbacks
    - LP: #1402853
  * xtensa: re-wire umount syscall to sys_oldumount
    - LP: #1402853
  * dm raid: ensure superblock's size matches device's logical block size
    - LP: #1402853
  * ahci: disable MSI instead of NCQ on Samsung pci-e SSDs on macbooks
    - LP: #1402853
  * ahci: Add Device IDs for Intel Sunrise Point PCH
    - LP: #1402853
  * power: charger-manager: Fix accessing invalidated power supply after
    charger unbind
    - LP: #1402853
  * mac80211: use secondary channel offset IE also beacons during CSA
    - LP: #1402853
  * mac80211: schedule the actual switch of the station before CSA count 0
    - LP: #1402853
  * mac80211: properly flush delayed scan work on interface removal
    - LP: #1402853
  * mac80211: fix use-after-free in defragmentation
    - LP: #1402853
  * tun: Fix csum_start with VLAN acceleration
    - LP: #1402853
  * macvtap: Fix csum_start when VLAN tags are present
    - LP: #1402853
  * dm thin: grab a virtual cell before looking up the mapping
    - LP: #1402853
  * KVM: x86: Fix uninitialized op->type for some immediate values
    - LP: #1402853
  * crypto: caam - fix missing dma unmap on error path
    - LP: #1402853
  * hwrng: pseries - port to new read API and fix stack corruption
    - LP: #1402853
  * drm/radeon: set correct CE ram size for CIK
    - LP: #1402853
  * drm/radeon: make sure mode init is complete in bandwidth_update
    - LP: #1402853
  * drm/radeon: use gart for DMA IB tests
    - LP: #1402853
  * drm/radeon: add missing crtc unlock when setting up the MC
    - LP: #1402853
  * ALSA: hda_intel: Add Device IDs for Intel Sunrise Point PCH
    - LP: #1402853
  * ALSA: hda_intel: Add DeviceIDs for Sunrise Point-LP
    - LP: #1402853
  * Input: alps - ignore potential bare packets when device is out of sync
    - LP: #1402853
  * Input: alps - allow up to 2 invalid packets without resetting device
    - LP: #1402853
  * scsi: only re-lock door after EH on devices that were reset
    - LP: #1402853
  * dm btree: fix a recursion depth bug in btree walking code
    - LP: #1402853
  * parisc: Use compat layer for msgctl, shmat, shmctl and semtimedop
    syscalls
    - LP: #1402853
  * ALSA: usb-audio: Fix memory leak in FTU quirk
    - LP: #1402853
  * audit: keep inode pinned
    - LP: #1402853
  * nfs: fix pnfs direct write memory leak
    - LP: #1402853
  * nfs: Fix use of uninitialized variable in nfs_getattr()
    - LP: #1402853
  * NFSv4: Ensure that we remove NFSv4.0 delegations when state has expired
    - LP: #1402853
  * NFSv4.1: nfs41_clear_delegation_stateid shouldn't trust
    NFS_DELEGATED_STATE
    - LP: #1402853
  * NFSv4: Fix races between nfs_remove_bad_delegation() and delegation
    return
    - LP: #1402853
  * NFSv4: Ensure that we call FREE_STATEID when NFSv4.x stateids are
    revoked
    - LP: #1402853
  * NFS: Don't try to reclaim delegation open state if recovery failed
    - LP: #1402853
  * libceph: do not crash on large auth tickets
    - LP: #1402853
  * ARM: 8191/1: decompressor: ensure I-side picks up relocated code
    - LP: #1402853
  * ARM: 8198/1: make kuser helpers depend on MMU
    - LP: #1402853
  * zram: avoid kunmap_atomic() of a NULL pointer
    - LP: #1402853
  * Input: alps - ignore bad data on Dell Latitudes E6440 and E7440
    - LP: #1402853
  * firewire: cdev: prevent kernel stack leaking into ioctl arguments
    - LP: #1402853
  * md: Always set RECOVERY_NEEDED when clearing RECOVERY_FROZEN
    - LP: #1402853
  * nfs: Don't busy-wait on SIGKILL in __nfs_iocounter_wait
    - LP: #1402853
  * target: Don't call TFO->write_pending if data_length == 0
    - LP: #1402853
  * vhost-scsi: Take configfs group dependency during
    VHOST_SCSI_SET_ENDPOINT
    - LP: #1402853
  * srp-target: Retry when QP creation fails with ENOMEM
    - LP: #1402853
  * ASoC: fsi: remove unsupported PAUSE flag
    - LP: #1402853
  * ASoC: rsnd: remove unsupported PAUSE flag
    - LP: #1402853
  * ib_isert: Add max_send_sge=2 minimum for control PDU responses
    - LP: #1402853
  * iser-target: Handle DEVICE_REMOVAL event on network portal listener
    correctly
    - LP: #1402853
  * ASoC: dpcm: Fix race between FE/BE updates and trigger
    - LP: #1402853
  * mac80211: Fix regression that triggers a kernel BUG with CCMP
    - LP: #1402853
  * rt2x00: do not align payload on modern H/W
    - LP: #1402853
  * ath9k: Add version/revision macros for QCA9531
    - LP: #1402853
  * ath9k: Fix RTC_DERIVED_CLK usage
    - LP: #1402853
  * ASoC: sgtl5000: Fix SMALL_POP bit definition
    - LP: #1402853
  * ALSA: usb-audio: Add ctrl message delay quirk for Marantz/Denon devices
    - LP: #1402853
  * bitops: Fix shift overflow in GENMASK macros
    - LP: #1402853
  * x86: Require exact match for 'noxsave' command line option
    - LP: #1402853
  * drm/i915: drop WaSetupGtModeTdRowDispatch:snb
    - LP: #1402853
  * ASoC: wm_adsp: Avoid attempt to free buffers that might still be in use
    - LP: #1402853
  * can: dev: avoid calling kfree_skb() from interrupt context
    - LP: #1402853
  * can: esd_usb2: fix memory leak on disconnect
    - LP: #1402853
  * x86, mm: Set NX across entire PMD at boot
    - LP: #1402853
  * of/irq: Drop obsolete 'interrupts' vs 'interrupts-extended' text
    - LP: #1402853
  * of/base: Fix PowerPC address parsing hack
    - LP: #1402853
  * clockevent: sun4i: Fix race condition in the probe code
    - LP: #1402853
  * MIPS: oprofile: Fix backtrace on 64-bit kernel
    - LP: #1402853
  * ACPI / PM: Ignore wakeup setting if the ACPI companion can't wake up
    - LP: #1402853
  * IB/isert: Adjust CQ size to HW limits
    - LP: #1402853
  * drm/radeon: fix endian swapping in vbios fetch for tdp table
    - LP: #1402853
  * Linux 3.13.11-ckt12
    - LP: #1402853
  * mm: Remove false WARN_ON from pagecache_isize_extended()
    - LP: #1402764
 -- Kamal Mostafa <kamal@xxxxxxxxxxxxx>   Mon, 15 Dec 2014 16:00:52 -0800

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https://bugs.launchpad.net/bugs/1398596

Title:
  [Revert] arm64: optimized copy_to_user and copy_from_user assembly
  code

Status in linux package in Ubuntu:
  Fix Released
Status in linux source package in Trusty:
  Fix Released
Status in linux source package in Utopic:
  Fix Released

Bug description:
  [Impact]
  Fixes an issue where the kernel hits unhandled pagefaults when copy_to_user is called.

  http://www.spinics.net/lists/arm-kernel/msg381811.html

  [Test Case]
  Put the system under memory pressure.

  [Regression Potential]
  It will cause a performance regression on certain workloads on arm64 systems.

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