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[Launchpad Bug Tracker <1226726@xxxxxxxxxxxxxxxxxx>]

This bug was fixed in the package linux - 3.5.0-43.66

---------------
linux (3.5.0-43.66) quantal; urgency=low

  [ Brad Figg ]

  * Release Tracking Bug
    - LP: #1242895

  [ Timo Aaltonen ]

  * SAUCE: ubuntu/i915: silence unclaimed register poking debug messages
    - LP: #1138787

  [ Upstream Kernel Changes ]

  * Revert "xfs: fix _xfs_buf_find oops on blocks beyond the filesystem
    end"
    - LP: #1236041
    - CVE-2013-1819 fix backport:
  * Revert "sctp: fix call to SCTP_CMD_PROCESS_SACK in
    sctp_cmd_interpreter()"
    - LP: #1241093
  * get rid of full-hash scan on detaching vfsmounts
    - LP: #1226726
  * Smack: Fix the bug smackcipso can't set CIPSO correctly
    - LP: #1236743
  * SAUCE: (no-up) Only let characters through when there are active
    readers.
    - LP: #1208740
  * usb: xhci: define port register names and use them instead of magic
    numbers
    - LP: #1229576
  * usb: xhci: add USB2 Link power management BESL support
    - LP: #1229576
  * iwl4965: fix rfkill set state regression
    - LP: #1241093
  * ath9k_htc: Restore skb headroom when returning skb to mac80211
    - LP: #1241093
  * ALSA: opti9xx: Fix conflicting driver object name
    - LP: #1241093
  * SUNRPC: Fix memory corruption issue on 32-bit highmem systems
    - LP: #1241093
  * drm/i915: ivb: fix edp voltage swing reg val
    - LP: #1241093
  * drm/vmwgfx: Split GMR2_REMAP commands if they are to large
    - LP: #1241093
  * ALSA: ak4xx-adda: info leak in ak4xxx_capture_source_info()
    - LP: #1241093
  * Bluetooth: Add support for Foxconn/Hon Hai [0489:e04d]
    - LP: #1241093
  * [SCSI] sg: Fix user memory corruption when SG_IO is interrupted by a
    signal
    - LP: #1241093
  * xen-gnt: prevent adding duplicate gnt callbacks
    - LP: #1241093
  * usb: config->desc.bLength may not exceed amount of data returned by the
    device
    - LP: #1241093
  * USB: cdc-wdm: fix race between interrupt handler and tasklet
    - LP: #1241093
  * xhci-plat: Don't enable legacy PCI interrupts.
    - LP: #1241093
  * ASoC: wm8960: Fix PLL register writes
    - LP: #1241093
  * rculist: list_first_or_null_rcu() should use list_entry_rcu()
    - LP: #1241093
  * USB: mos7720: use GFP_ATOMIC under spinlock
    - LP: #1241093
  * USB: mos7720: fix big-endian control requests
    - LP: #1241093
  * staging: comedi: dt282x: dt282x_ai_insn_read() always fails
    - LP: #1241093
  * usb: ehci-mxc: check for pdata before dereferencing
    - LP: #1241093
  * usb: xhci: Disable runtime PM suspend for quirky controllers
    - LP: #1241093
  * USB: OHCI: Allow runtime PM without system sleep
    - LP: #1241093
  * ACPI / EC: Add HP Folio 13 to ec_dmi_table in order to skip DSDT scan
    - LP: #1241093
  * ACPI / EC: Add ASUSTEK L4R to quirk list in order to validate ECDT
    - LP: #1241093
  * USB: fix build error when CONFIG_PM_SLEEP isn't enabled
    - LP: #1241093
  * ALSA: hda - hdmi: Fallback to ALSA allocation when selecting CA
    - LP: #1241093
  * regmap: silence GCC warning
    - LP: #1241093
  * target: Fix trailing ASCII space usage in INQUIRY vendor+model
    - LP: #1241093
  * iwlwifi: dvm: don't send BT_CONFIG on devices w/o Bluetooth
    - LP: #1241093
  * Bluetooth: Add support for Mediatek Bluetooth device [0e8d:763f]
    - LP: #1241093
  * Bluetooth: ath3k: Add support for Fujitsu Lifebook UH5x2 [04c5:1330]
    - LP: #1241093
  * Bluetooth: ath3k: Add support for ID 0x13d3/0x3402
    - LP: #1241093
  * Bluetooth: Add support for Atheros [0cf3:e003]
    - LP: #1241093
  * xen/events: mask events when changing their VCPU binding
    - LP: #1241093
  * tipc: fix lockdep warning during bearer initialization
    - LP: #1241093
  * htb: fix sign extension bug
    - LP: #1241093
  * net: check net.core.somaxconn sysctl values
    - LP: #1241093
  * neighbour: populate neigh_parms on alloc before calling ndo_neigh_setup
    - LP: #1241093
  * bonding: modify only neigh_parms owned by us
    - LP: #1241093
  * fib_trie: remove potential out of bound access
    - LP: #1241093
  * tcp: cubic: fix overflow error in bictcp_update()
    - LP: #1241093
  * tcp: cubic: fix bug in bictcp_acked()
    - LP: #1241093
  * macvtap: do not zerocopy if iov needs more pages than MAX_SKB_FRAGS
    - LP: #1241093
  * ipv6: don't stop backtracking in fib6_lookup_1 if subtree does not
    match
    - LP: #1241093
  * 8139cp: Fix skb leak in rx_status_loop failure path.
    - LP: #1241093
  * tun: signedness bug in tun_get_user()
    - LP: #1241093
  * ipv6: remove max_addresses check from ipv6_create_tempaddr
    - LP: #1241093
  * ipv6: drop packets with multiple fragmentation headers
    - LP: #1241093
  * net: bridge: convert MLDv2 Query MRC into msecs_to_jiffies for
    max_delay
    - LP: #1241093
  * ICMPv6: treat dest unreachable codes 5 and 6 as EACCES, not EPROTO
    - LP: #1241093
  * ipv6: Don't depend on per socket memory for neighbour discovery
    messages
    - LP: #1241093
  * net: ipv6: tcp: fix potential use after free in tcp_v6_do_rcv
    - LP: #1241093
  * ath9k: always clear ps filter bit on new assoc
    - LP: #1241093
  * libceph: unregister request in __map_request failed and nofail == false
    - LP: #1241093
  * powerpc: Handle unaligned ldbrx/stdbrx
    - LP: #1241093
  * ath9k: fix rx descriptor related race condition
    - LP: #1241093
  * ath9k: avoid accessing MRC registers on single-chain devices
    - LP: #1241093
  * brcmsmac: Fix WARNING caused by lack of calls to dma_mapping_error()
    - LP: #1241093
  * mmc: tmio_mmc_dma: fix PIO fallback on SDHI
    - LP: #1241093
  * HID: validate HID report id size
    - LP: #1241093
    - CVE-2013-2888
  * of: Fix missing memory initialization on FDT unflattening
    - LP: #1241093
  * drm/edid: add quirk for Medion MD30217PG
    - LP: #1241093
  * drm/radeon: fix endian bugs in hw i2c atom routines
    - LP: #1241093
  * drm/radeon: update line buffer allocation for dce4.1/5
    - LP: #1241093
  * drm/radeon: update line buffer allocation for dce6
    - LP: #1241093
  * drm/radeon: fix LCD record parsing
    - LP: #1241093
  * drm/radeon: fix resume on some rs4xx boards (v2)
    - LP: #1241093
  * drm/radeon: fix handling of variable sized arrays for router objects
    - LP: #1241093
  * radeon kms: fix uninitialised hotplug work usage in r100_irq_process()
    - LP: #1241093
  * drm/radeon: fix init ordering for r600+
    - LP: #1241093
  * HID: input: return ENODATA if reading battery attrs fails
    - LP: #1241093
  * HID: battery: don't do DMA from stack
    - LP: #1241093
  * fuse: postpone end_page_writeback() in fuse_writepage_locked()
    - LP: #1241093
  * fuse: invalidate inode attributes on xattr modification
    - LP: #1241093
  * s5p-g2d: Fix registration failure
    - LP: #1241093
  * DocBook: upgrade media_api DocBook version to 4.2
    - LP: #1241093
  * v4l2: added missing mutex.h include to v4l2-ctrls.h
    - LP: #1241093
  * hdpvr: fix iteration over uninitialized lists in hdpvr_probe()
    - LP: #1241093
  * exynos4-is: Fix fimc-lite bayer formats
    - LP: #1241093
  * exynos4-is: Fix entity unregistration on error path
    - LP: #1241093
  * libceph: use pg_num_mask instead of pgp_num_mask for pg.seed calc
    - LP: #1241093
  * HID: pantherlord: validate output report details
    - LP: #1241093
    - CVE-2013-2892
  * HID: ntrig: validate feature report details
    - LP: #1241093
    - CVE-2013-2896
  * HID: picolcd_core: validate output report details
    - LP: #1241093
    - CVE-2013-2899
  * HID: check for NULL field when setting values
    - LP: #1241093
  * drm/i915: try not to lose backlight CBLV precision
    - LP: #1241093
  * powerpc: Default arch idle could cede processor on pseries
    - LP: #1241093
  * ocfs2: fix the end cluster offset of FIEMAP
    - LP: #1241093
  * mm/huge_memory.c: fix potential NULL pointer dereference
    - LP: #1241093
  * mm: fix aio performance regression for database caused by THP
    - LP: #1241093
  * memcg: fix multiple large threshold notifications
    - LP: #1241093
  * intel-iommu: Fix leaks in pagetable freeing
    - LP: #1241093
  * MIPS: ath79: Fix ar933x watchdog clock
    - LP: #1241093
  * ARM: PCI: versatile: Fix map_irq function to match hardware
    - LP: #1241093
  * ARM: PCI: versatile: Fix SMAP register offsets
    - LP: #1241093
  * crypto: api - Fix race condition in larval lookup
    - LP: #1241093
  * cifs: ensure that srv_mutex is held when dealing with ssocket pointer
    - LP: #1241093
  * ALSA: hda - Add Toshiba Satellite C870 to MSI blacklist
    - LP: #1241093
  * ASoC: mc13783: add spi errata fix
    - LP: #1241093
  * [SCSI] sd: Fix potential out-of-bounds access
    - LP: #1241093
  * Linux 3.5.7.22
    - LP: #1241093
  * drm/radeon/atom: workaround vbios bug in transmitter table on rs880
    (v2)
    - LP: #1241093
  * drm/ast: fix the ast open key function
    - LP: #1241093
  * sched/fair: Fix small race where child->se.parent,cfs_rq might point to
    invalid ones
    - LP: #1241093
  * HID: provide a helper for validating hid reports
    - LP: #1241093
  * HID: zeroplus: validate output report details
    - LP: #1241093
    - CVE-2013-2889
  * HID: LG: validate HID output report details
    - LP: #1241093
    - CVE-2013-2893
  * HID: add usage_index in struct hid_usage.
    - LP: #1241093
  * HID: validate feature and input report details
    - LP: #1241093
    - CVE-2013-2897
  * HID: logitech-dj: validate output report details
    - LP: #1241093
    - CVE-2013-2895
  * HID: multitouch: validate indexes details
    - LP: #1241093
    - CVE-2013-2897
  * drm/radeon: fix panel scaling with eDP and LVDS bridges
    - LP: #1241093
  * net: usb: cdc_ether: Use wwan interface for Telit modules
    - LP: #1241093
  * usb: gadget: fix a bug and a WARN_ON in dummy-hcd
    - LP: #1241093
  * drm/ttm: fix the tt_populated check in ttm_tt_destroy()
    - LP: #1241093
  * sfc: Fix efx_rx_buf_offset() for recycled pages
    - LP: #1241093
  * perf: Clarify perf_cpu_context::active_pmu usage by renaming it to
    ::unique_pmu
    - LP: #1241093
  * perf: Fix perf_cgroup_switch for sw-events
    - LP: #1241093
  * cfq: explicitly use 64bit divide operation for 64bit arguments
    - LP: #1241093
  * perf tools: Handle JITed code in shared memory
    - LP: #1241093
  * HID: Fix Speedlink VAD Cezanne support for some devices
    - LP: #1241093
  * HID: usbhid: quirk for N-Trig DuoSense Touch Screen
    - LP: #1241093
  * workqueue: cond_resched() after processing each work item
    - LP: #1241093
  * cgroup: fail if monitored file and event_control are in different
    cgroup
    - LP: #1241093
  * tg3: Don't turn off led on 5719 serdes port 0
    - LP: #1241093
  * tg3: Expand led off fix to include 5720
    - LP: #1241093
  * mm, memcg: give exiting processes access to memory reserves
    - LP: #1241093
  * video: mxsfb: Add missing break
    - LP: #1241093
  * xhci: Fix race between ep halt and URB cancellation
    - LP: #1241093
  * serial: pch_uart: fix tty-kref leak in rx-error path
    - LP: #1241093
  * serial: pch_uart: fix tty-kref leak in dma-rx path
    - LP: #1241093
  * x86, efi: Don't map Boot Services on i386
    - LP: #1241093
  * ALSA: compress: Fix compress device unregister.
    - LP: #1241093
  * dm snapshot: workaround for a false positive lockdep warning
    - LP: #1241093
  * dm-snapshot: fix performance degradation due to small hash size
    - LP: #1241093
  * x86/reboot: Add quirk to make Dell C6100 use reboot=pci automatically
    - LP: #1241093
  * drm/radeon: disable tests/benchmarks if accel is disabled
    - LP: #1241093
  * xhci: Fix oops happening after address device timeout
    - LP: #1241093
  * xhci: Ensure a command structure points to the correct trb on the
    command ring
    - LP: #1241093
  * drm/i915/dp: increase i2c-over-aux retry interval on AUX DEFER
    - LP: #1241093
  * staging: vt6656: [BUG] main_usb.c oops on device_close move flag
    earlier.
    - LP: #1241093
  * USB: fix PM config symbol in uhci-hcd, ehci-hcd, and xhci-hcd
    - LP: #1241093
  * usb/core/devio.c: Don't reject control message to endpoint with wrong
    direction bit
    - LP: #1241093
  * hwmon: (applesmc) Check key count before proceeding
    - LP: #1241093
  * USB: Fix breakage in ffs_fs_mount()
    - LP: #1241093
  * usb: dwc3: pci: add support for BayTrail
    - LP: #1241093
  * caif: Add missing braces to multiline if in cfctrl_linkup_request
    - LP: #1241093
  * net: sctp: fix smatch warning in sctp_send_asconf_del_ip
    - LP: #1241093
  * net: sctp: fix ipv6 ipsec encryption bug in sctp_v6_xmit
    - LP: #1241093
  * resubmit bridge: fix message_age_timer calculation
    - LP: #1241093
  * bridge: Clamp forward_delay when enabling STP
    - LP: #1241093
  * ip: use ip_hdr() in __ip_make_skb() to retrieve IP header
    - LP: #1241093
  * ip: generate unique IP identificator if local fragmentation is allowed
    - LP: #1241093
  * netpoll: fix NULL pointer dereference in netpoll_cleanup
    - LP: #1241093
  * ipv6: udp packets following an UFO enqueued packet need also be handled
    by UFO
    - LP: #1241093
  * via-rhine: fix VLAN priority field (PCP, IEEE 802.1p)
    - LP: #1241093
  * net: flow_dissector: fix thoff for IPPROTO_AH
    - LP: #1241093
  * bonding: Fix broken promiscuity reference counting issue
    - LP: #1241093
  * ipv4 igmp: use in_dev_put in timer handlers instead of __in_dev_put
    - LP: #1241093
  * ipv6 mcast: use in6_dev_put in timer handlers instead of __in6_dev_put
    - LP: #1241093
  * dm9601: fix IFF_ALLMULTI handling
    - LP: #1241093
  * ll_temac: Reset dma descriptors indexes on ndo_open
    - LP: #1241093
  * gianfar: Change default HW Tx queue scheduling mode
    - LP: #1241093
  * fanotify: dont merge permission events
    - LP: #1241093
  * sparc32: Fix exit flag passed from traced sys_sigreturn
    - LP: #1241093
  * sparc64: Fix not SRA'ed %o5 in 32-bit traced syscall
    - LP: #1241093
  * esp_scsi: Fix tag state corruption when autosensing.
    - LP: #1241093
  * sparc64: Fix ITLB handler of null page
    - LP: #1241093
  * sparc64: Remove RWSEM export leftovers
    - LP: #1241093
  * sparc64: Fix off by one in trampoline TLB mapping installation loop.
    - LP: #1241093
  * ASoC: max98095: a couple array underflows
    - LP: #1241093
  * ASoC: 88pm860x: array overflow in snd_soc_put_volsw_2r_st()
    - LP: #1241093
  * Bluetooth: Add a new PID/VID 0cf3/e005 for AR3012.
    - LP: #1241093
  * Bluetooth: Fix security level for peripheral role
    - LP: #1241093
  * Bluetooth: Fix encryption key size for peripheral role
    - LP: #1241093
  * Bluetooth: Add support for BCM20702A0 [0b05, 17cb]
    - LP: #1241093
  * rtlwifi: Align private space in rtl_priv struct
    - LP: #1241093
  * p54usb: add USB ID for Corega WLUSB2GTST USB adapter
    - LP: #1241093
  * mwifiex: fix hang issue for USB chipsets
    - LP: #1241093
  * mwifiex: fix NULL pointer dereference in usb suspend handler
    - LP: #1241093
  * USB: serial: option: Ignore card reader interface on Huawei E1750
    - LP: #1241093
  * ib_srpt: Destroy cm_id before destroying QP.
    - LP: #1241093
  * powerpc: Fix parameter clobber in csum_partial_copy_generic()
    - LP: #1241093
  * powerpc/sysfs: Disable writing to PURR in guest mode
    - LP: #1241093
  * powerpc/iommu: Use GFP_KERNEL instead of GFP_ATOMIC in
    iommu_init_table()
    - LP: #1241093
  * powerpc/vio: Fix modalias_show return values
    - LP: #1241093
  * ib_srpt: always set response for task management
    - LP: #1241093
  * staging: comedi: ni_65xx: (bug fix) confine insn_bits to one subdevice
    - LP: #1241093
  * mwifiex: fix memory corruption when unsetting multicast list
    - LP: #1241093
  * ext4: avoid hang when mounting non-journal filesystems with orphan list
    - LP: #1241093
  * dmaengine: imx-dma: fix slow path issue in prep_dma_cyclic
    - LP: #1241093
  * dmaengine: imx-dma: fix lockdep issue between irqhandler and tasklet
    - LP: #1241093
  * dma: fix comments
    - LP: #1241093
  * dmaengine: imx-dma: fix callback path in tasklet
    - LP: #1241093
  * Linux 3.5.7.23
    - LP: #1241093
  * [PATCH 01/35] drm/i915: Revert hdmi HDP pin checks
    - LP: #1138700
  * [PATCH 02/35] drm/i915: add HAS_DDI check
    - LP: #1240639
  * [PATCH 03/35] drm/i915: don't intel_crt_init on any ULT machines
    - LP: #1240639
  * [PATCH 04/35] drm/i915: no lvds quirk for hp t5740
    - LP: #1240639
  * [PATCH 05/35] drm/i915/sdvo: Use &intel_sdvo->ddc instead of
    intel_sdvo->i2c for DDC.
    - LP: #1240639
  * [PATCH 06/35] drm/i915: prefer VBT modes for SVDO-LVDS over EDID
    - LP: #1240639
  * [PATCH 07/35] drm/i915: Fix context sizes on HSW
    - LP: #1240639
  * [PATCH 08/35] drm/i915: Only clear write-domains after a successful
    wait-seqno
    - LP: #1240639
  * [PATCH 09/35] drm/i915: Correct obj->mm_list link to
    dev_priv->dev_priv->mm.inactive_list
    - LP: #1240639
  * [PATCH 10/35] drm/i915: fix up ring cleanup for the i830/i845 CS tlb
    w/a
    - LP: #1240639
  * [PATCH 11/35] Partially revert "drm/i915: unconditionally use mt
    forcewake on hsw/ivb"
    - LP: #1240639
  * [PATCH 12/35] drm/i915: Fix write-read race with multiple rings
    - LP: #1240639
  * [PATCH 13/35] drm/i915: merge {i965, sandybridge}_write_fence_reg()
    - LP: #1240639
  * [PATCH 14/35] drm/i915: Fix incoherence with fence updates on
    Sandybridge+
    - LP: #1240639
  * [PATCH 15/35] Revert "drm/i915: Workaround incoherence between fences
    and LLC across multiple CPUs"
    - LP: #1240639
  * [PATCH 16/35] drm/i915: rename sdvox_reg to hdmi_reg on HDMI context
    - LP: #1240639
  * [PATCH 17/35] drm/i915: don't setup hdmi for port D edp in ddi_init
    - LP: #1240639
  * [PATCH 18/35] drm/i915: Preserve the DDI_A_4_LANES bit from the bios
    - LP: #1240639
  * [PATCH 19/35] drm/i915: fix long-standing SNB regression in power
    consumption after resume v2
    - LP: #1240639
  * [PATCH 20/35] drm/i915: inverted brightness quirk for Acer Aspire 4736Z
    - LP: #1240639
  * [PATCH 21/35] drm/i915: quirk no PCH_PWM_ENABLE for Dell XPS13
    backlight
    - LP: #1162026, #1163720, #1240639
  * [PATCH 22/35] drm/i915: Serialize almost all register access
    - LP: #1240639
  * [PATCH 23/35] drm/i915: fix up gt init sequence fallout
    - LP: #1240639
  * [PATCH 24/35] drm/i915: initialize gt_lock early with other spin locks
    - LP: #1240639
  * [PATCH 25/35] drm/i915: fix missed hunk after GT access breakage
    - LP: #1240639
  * [PATCH 26/35] drm/i915: do not disable backlight on vgaswitcheroo
    switch off
    - LP: #1240639
  * [PATCH 27/35] drm/i915: Move num_pipes to intel info
    - LP: #1240639
  * [PATCH 28/35] drm/i915: Don't deref pipe->cpu_transcoder in the
    hangcheck code
    - LP: #1240639
  * [PATCH 29/35] drm/i915: Invalidate TLBs for the rings after a reset
    - LP: #1240639
  * [PATCH 30/35] drm/i915: ivb: fix edp voltage swing reg val
    - LP: #1240639
  * [PATCH 31/35] drm/i915: try not to lose backlight CBLV precision
    - LP: #1240639
  * [PATCH 32/35] drm/i915: do not update cursor in crtc mode set
    - LP: #1240639
  * [PATCH 33/35] drm/i915: Don't enable the cursor on a disable pipe
    - LP: #1240639
  * [PATCH 34/35] drm/i915/dp: increase i2c-over-aux retry interval on AUX
    DEFER
    - LP: #1240639
  * [PATCH 35/35] drm/i915: hsw: fix link training for eDP on port-A
    - LP: #1138700
  * USB: handle LPM errors during device suspend correctly
    - LP: #1241093
 -- Brad Figg <brad.figg@xxxxxxxxxxxxx>   Thu, 17 Oct 2013 10:49:22 -0700

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

** CVE added: http://www.cve.mitre.org/cgi-
bin/cvename.cgi?name=2013-1819

** CVE added: http://www.cve.mitre.org/cgi-
bin/cvename.cgi?name=2013-2888

** CVE added: http://www.cve.mitre.org/cgi-
bin/cvename.cgi?name=2013-2889

** CVE added: http://www.cve.mitre.org/cgi-
bin/cvename.cgi?name=2013-2892

** CVE added: http://www.cve.mitre.org/cgi-
bin/cvename.cgi?name=2013-2893

** CVE added: http://www.cve.mitre.org/cgi-
bin/cvename.cgi?name=2013-2895

** CVE added: http://www.cve.mitre.org/cgi-
bin/cvename.cgi?name=2013-2896

** CVE added: http://www.cve.mitre.org/cgi-
bin/cvename.cgi?name=2013-2897

** CVE added: http://www.cve.mitre.org/cgi-
bin/cvename.cgi?name=2013-2899

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

** CVE added: http://www.cve.mitre.org/cgi-
bin/cvename.cgi?name=2013-2147

** CVE added: http://www.cve.mitre.org/cgi-
bin/cvename.cgi?name=2013-2894

** CVE added: http://www.cve.mitre.org/cgi-
bin/cvename.cgi?name=2013-4343

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https://bugs.launchpad.net/bugs/1226726

Title:
  dentry_reset_mounted walks entire mount list holding vfsmount write
  lock

Status in “linux” package in Ubuntu:
  Fix Released
Status in “linux” source package in Precise:
  Won't Fix
Status in “linux” source package in Quantal:
  Fix Released
Status in “linux” source package in Raring:
  Fix Released
Status in “linux” source package in Saucy:
  Fix Released

Bug description:
  SRU Justification:

  Impact: When creating thousands of network namespaces the delay in
  executing commands increases exponentially in kernels before 84d17192.

  Fix: In 84d17192 in the upstream kernel, locking code in
  fs/namespace.c is greatly improved resulting in much better
  performance when the number namespaces increase.

  Testcase: Below, test_ns.sh can be run and a graph can be compared
  between the existing version and the patched version.

  Additional Information: Because this is a change in the vfs layer, I
  ran the xfstests and compared before and after results of this patch.
  The patch did not create any additional failures in the generic
  xfstests.

  The quantal and raring solutions differ but are both based on the 84d17192
  patch. The quantal solution does a backport of this patch instead of clean
  cherry-picks because of the amount of deps required to just use cherry-picks.
  The raring solution was able to be done with two clean cherry-picks and that's
  why that solution was chosen.

  --

  Whenever one enters a network namespace via "ip netns exec foobar
  somecommand" there is a mount done of the appropriate device on /sys
  since "somecommand" needs to see namespace specific versions of /sys
  directories. When the ip process exits these mounts need to be torn
  down, and that requires a global write lock for vfsmount_lock (this is
  a single writer multiple reader lock). This has serious performance
  implications when the number of name spaces increase.

  The commit 84d17192 addresses this issue, and it is clear by running
  the attached testcase that it fixes performance issues when dealing
  with large numbers of namespaces. I've included a graph with the
  differences in performance between this fix and its parent commit to
  show the the improve in performance. The x-axis represents the number
  of namespaces and the y-axis is execution time in ms. After applying
  the patch the performance delays are not exponentially increasing.

  This affects 3.2/3.5/3.8 series kernels, as it was fixed in 3.10.

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