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[Launchpad Bug Tracker <1358949@xxxxxxxxxxxxxxxxxx>]

This bug was fixed in the package linux - 3.13.0-36.63

---------------
linux (3.13.0-36.63) trusty; urgency=low

  [ Joseph Salisbury ]

  * Release Tracking Bug
    - LP: #1365052

  [ Feng Kan ]

  * SAUCE: (no-up) irqchip:gic: change access of gicc_ctrl register to read
    modify write.
    - LP: #1357527
  * SAUCE: (no-up) arm64: optimized copy_to_user and copy_from_user
    assembly code
    - LP: #1358949

  [ Ming Lei ]

  * SAUCE: (no-up) Drop APM X-Gene SoC Ethernet driver
    - LP: #1360140
  * [Config] Drop XGENE entries
    - LP: #1360140
  * [Config] CONFIG_NET_XGENE=m for arm64
    - LP: #1360140

  [ Stefan Bader ]

  * SAUCE: Add compat macro for skb_get_hash
    - LP: #1358162
  * SAUCE: bcache: prevent crash on changing writeback_running
    - LP: #1357295

  [ Suman Tripathi ]

  * SAUCE: (no-up) arm64: Fix the csr-mask for APM X-Gene SoC AHCI SATA PHY
    clock DTS node.
    - LP: #1359489
  * SAUCE: (no-up) ahci_xgene: Skip the PHY and clock initialization if
    already configured by the firmware.
    - LP: #1359501
  * SAUCE: (no-up) ahci_xgene: Fix the link down in first attempt for the
    APM X-Gene SoC AHCI SATA host controller driver.
    - LP: #1359507

  [ Tuan Phan ]

  * SAUCE: (no-up) pci-xgene-msi: fixed deadlock in irq_set_affinity
    - LP: #1359514

  [ Upstream Kernel Changes ]

  * iwlwifi: mvm: Add a missed beacons threshold
    - LP: #1349572
  * mac80211: reset probe_send_count also in HW_CONNECTION_MONITOR case
    - LP: #1349572
  * genirq: Add an accessor for IRQ_PER_CPU flag
    - LP: #1357527
  * arm64: perf: add support for percpu pmu interrupt
    - LP: #1357527
  * cifs: sanity check length of data to send before sending
    - LP: #1283101
  * KVM: nVMX: Pass vmexit parameters to nested_vmx_vmexit
    - LP: #1329434
  * KVM: nVMX: Rework interception of IRQs and NMIs
    - LP: #1329434
  * KVM: vmx: disable APIC virtualization in nested guests
    - LP: #1329434
  * HID: Add transport-driver functions to the USB HID interface.
    - LP: #1353021
  * ahci_xgene: Removing NCQ support from the APM X-Gene SoC AHCI SATA Host
    Controller driver.
    - LP: #1358498
  * fold d_kill() and d_free()
    - LP: #1354234
  * fold try_prune_one_dentry()
    - LP: #1354234
  * new helper: dentry_free()
    - LP: #1354234
  * expand the call of dentry_lru_del() in dentry_kill()
    - LP: #1354234
  * dentry_kill(): don't try to remove from shrink list
    - LP: #1354234
  * don't remove from shrink list in select_collect()
    - LP: #1354234
  * more graceful recovery in umount_collect()
    - LP: #1354234
  * dcache: don't need rcu in shrink_dentry_list()
    - LP: #1354234
  * lift the "already marked killed" case into shrink_dentry_list()
  * split dentry_kill()
    - LP: #1354234
  * expand dentry_kill(dentry, 0) in shrink_dentry_list()
    - LP: #1354234
  * shrink_dentry_list(): take parent's ->d_lock earlier
    - LP: #1354234
  * dealing with the rest of shrink_dentry_list() livelock
    - LP: #1354234
  * dentry_kill() doesn't need the second argument now
    - LP: #1354234
  * dcache: add missing lockdep annotation
    - LP: #1354234
  * fs: convert use of typedef ctl_table to struct ctl_table
    - LP: #1354234
  * lock_parent: don't step on stale ->d_parent of all-but-freed one
    - LP: #1354234
  * tools/testing/selftests/ptrace/peeksiginfo.c: add PAGE_SIZE definition
    - LP: #1358855
  * x86, irq, pic: Probe for legacy PIC and set legacy_pic appropriately
    - LP: #1317697
  * bnx2x: Fix kernel crash and data miscompare after EEH recovery
    - LP: #1353105
  * bnx2x: Adapter not recovery from EEH error injection
    - LP: #1353105
  * Fix: module signature vs tracepoints: add new TAINT_UNSIGNED_MODULE
    - LP: #1359670
  * bcache: fix crash on shutdown in passthrough mode
    - LP: #1357295
  * bcache: fix uninterruptible sleep in writeback thread
    - LP: #1357295
  * namespaces: Use task_lock and not rcu to protect nsproxy
    - LP: #1328088
  * MAINTAINERS: Add entry for APM X-Gene SoC ethernet driver
    - LP: #1360140
  * Documentation: dts: Add bindings for APM X-Gene SoC ethernet driver
    - LP: #1360140
  * dts: Add bindings for APM X-Gene SoC ethernet driver
    - LP: #1360140
  * drivers: net: Add APM X-Gene SoC ethernet driver support.
    - LP: #1360140
  * powerpc/mm: Add new "set" flag argument to pte/pmd update function
    - LP: #1357014
  * powerpc/thp: Add write barrier after updating the valid bit
    - LP: #1357014
  * powerpc/thp: Don't recompute vsid and ssize in loop on invalidate
    - LP: #1357014
  * powerpc/thp: Invalidate old 64K based hash page mapping before insert
    of 4k pte
    - LP: #1357014
  * powerpc/thp: Handle combo pages in invalidate
    - LP: #1357014
  * powerpc/thp: Invalidate with vpn in loop
    - LP: #1357014
  * powerpc/thp: Use ACCESS_ONCE when loading pmdp
    - LP: #1357014
  * powerpc/mm: Use read barrier when creating real_pte
    - LP: #1357014
  * powerpc/thp: Add tracepoints to track hugepage invalidate
    - LP: #1357014
  * powerpc: subpage_protect: Increase the array size to take care of 64TB
    - LP: #1357014
  * mfd: rtsx: Add set pull control macro and simplify rtl8411
    - LP: #1361086
  * mfd: rtsx: Add support for card reader rtl8402
    - LP: #1361086
  * kvm: iommu: fix the third parameter of kvm_iommu_put_pages
    (CVE-2014-3601)
    - LP: #1362443
    - CVE-2014-3601
  * isofs: Fix unbounded recursion when processing relocated directories
    - LP: #1362447, #1362448
    - CVE-2014-5472
  * net: sctp: inherit auth_capable on INIT collisions
    - LP: #1349804
    - CVE-2014-5077
  * blk-mq: fix initializing request's start time
    - LP: #1297522

  [ Vinayak Kale ]

  * SAUCE: (no-up) dt-bindings: Add Potenza PMU binding
    - LP: #1357527
  * SAUCE: (no-up) arm64: dts: Add PMU node for APM X-Gene Storm SOC
    - LP: #1357527
 -- Joseph Salisbury <joseph.salisbury@xxxxxxxxxxxxx>   Wed, 03 Sep 2014 12:13:43 -0400

** Changed in: linux (Ubuntu Trusty)
       Status: Fix Committed => Fix Released

** CVE added: http://www.cve.mitre.org/cgi-
bin/cvename.cgi?name=2014-3601

** CVE added: http://www.cve.mitre.org/cgi-
bin/cvename.cgi?name=2014-5077

** CVE added: http://www.cve.mitre.org/cgi-
bin/cvename.cgi?name=2014-5472

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https://bugs.launchpad.net/bugs/1358949

Title:
  arm64 iperf performance suboptimal

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]
  The copy_{to,from}_user implementations in the Ubuntu kernel are suboptimal. Optimized implementations have been submitted upstream and have shown a significant improvement in network performance.

      Iperf performance increase:
                  -l (size)               1 core result
      Optimized   64B                     44-51Mb/s
                  1500B                   4.9Gb/s
                  30000B                  16.2Gb/s
      Original    64B                     34-50.7Mb/s
                  1500B                   4.7Gb/s
                  30000B                  14.5Gb/s

  [Test Case]
  Generate traffic from one node to another using iperf (see above for config).

  [Regression Risk]
  These functions are obviously used heavily throughout the kernel, so a defect here could have significant impact. This risk is mitigated by using an implementation heavily based on the linaro string libraries (which are used in other places already, e.g. glibc), and through active testing of this patch on real hardware using a trusty-kernel base.

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