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[Launchpad Bug Tracker <1776277@xxxxxxxxxxxxxxxxxx>]

This bug was fixed in the package linux - 4.17.0-9.10

---------------
linux (4.17.0-9.10) cosmic; urgency=medium

  * linux: 4.17.0-9.10 -proposed tracker (LP: #1787988)

  * Cosmic update to 4.17.17 stable release (LP: #1787973)
    - x86/speculation/l1tf: Exempt zeroed PTEs from inversion
    - Linux 4.17.17

  * Cosmic update to 4.17.16 stable release (LP: #1787972)
    - x86/l1tf: Fix build error seen if CONFIG_KVM_INTEL is disabled
    - x86: i8259: Add missing include file
    - x86/platform/UV: Mark memblock related init code and data correctly
    - x86/mm/pti: Clear Global bit more aggressively
    - xen/pv: Call get_cpu_address_sizes to set x86_virt/phys_bits
    - x86/mm: Disable ioremap free page handling on x86-PAE
    - kbuild: verify that $DEPMOD is installed
    - crypto: ccree - fix finup
    - crypto: ccree - fix iv handling
    - crypto: ccp - Check for NULL PSP pointer at module unload
    - crypto: ccp - Fix command completion detection race
    - crypto: x86/sha256-mb - fix digest copy in sha256_mb_mgr_get_comp_job_avx2()
    - crypto: vmac - require a block cipher with 128-bit block size
    - crypto: vmac - separate tfm and request context
    - crypto: blkcipher - fix crash flushing dcache in error path
    - crypto: ablkcipher - fix crash flushing dcache in error path
    - crypto: skcipher - fix aligning block size in skcipher_copy_iv()
    - crypto: skcipher - fix crash flushing dcache in error path
    - ioremap: Update pgtable free interfaces with addr
    - x86/mm: Add TLB purge to free pmd/pte page interfaces
    - Linux 4.17.16

  * Cosmic update to 4.17.16 stable release (LP: #1787972) // CVE-2018-9363
    - Bluetooth: hidp: buffer overflow in hidp_process_report

  * linux-cloud-tools-common: Ensure hv-kvp-daemon.service starts before
    walinuxagent.service (LP: #1739107)
    - [Debian] hyper-v -- Ensure that hv-kvp-daemon.service starts before
      walinuxagent.service

  * Miscellaneous Ubuntu changes
    - [Packaging] retpoline -- fix temporary filenaming

linux (4.17.0-8.9) cosmic; urgency=medium

  * linux: 4.17.0-8.9 -proposed tracker (LP: #1787259)

  * Cosmic update to v4.17.15 stable release (LP: #1787257)
    - parisc: Enable CONFIG_MLONGCALLS by default
    - parisc: Define mb() and add memory barriers to assembler unlock sequences
    - Mark HI and TASKLET softirq synchronous
    - stop_machine: Disable preemption after queueing stopper threads
    - sched/deadline: Update rq_clock of later_rq when pushing a task
    - zram: remove BD_CAP_SYNCHRONOUS_IO with writeback feature
    - xen/netfront: don't cache skb_shinfo()
    - bpf, sockmap: fix leak in bpf_tcp_sendmsg wait for mem path
    - bpf, sockmap: fix bpf_tcp_sendmsg sock error handling
    - scsi: sr: Avoid that opening a CD-ROM hangs with runtime power management
      enabled
    - scsi: qla2xxx: Fix memory leak for allocating abort IOCB
    - init: rename and re-order boot_cpu_state_init()
    - root dentries need RCU-delayed freeing
    - make sure that __dentry_kill() always invalidates d_seq, unhashed or not
    - fix mntput/mntput race
    - fix __legitimize_mnt()/mntput() race
    - ARM: dts: imx6sx: fix irq for pcie bridge
    - x86/paravirt: Fix spectre-v2 mitigations for paravirt guests
    - x86/speculation: Protect against userspace-userspace spectreRSB
    - kprobes/x86: Fix %p uses in error messages
    - x86/irqflags: Provide a declaration for native_save_fl
    - x86/speculation/l1tf: Increase 32bit PAE __PHYSICAL_PAGE_SHIFT
    - x86/speculation/l1tf: Change order of offset/type in swap entry
    - x86/speculation/l1tf: Protect swap entries against L1TF
    - x86/speculation/l1tf: Protect PROT_NONE PTEs against speculation
    - x86/speculation/l1tf: Make sure the first page is always reserved
    - x86/speculation/l1tf: Add sysfs reporting for l1tf
    - x86/speculation/l1tf: Disallow non privileged high MMIO PROT_NONE mappings
    - x86/speculation/l1tf: Limit swap file size to MAX_PA/2
    - x86/bugs: Move the l1tf function and define pr_fmt properly
    - sched/smt: Update sched_smt_present at runtime
    - x86/smp: Provide topology_is_primary_thread()
    - x86/topology: Provide topology_smt_supported()
    - cpu/hotplug: Make bringup/teardown of smp threads symmetric
    - cpu/hotplug: Split do_cpu_down()
    - cpu/hotplug: Provide knobs to control SMT
    - x86/cpu: Remove the pointless CPU printout
    - x86/cpu/AMD: Remove the pointless detect_ht() call
    - x86/cpu/common: Provide detect_ht_early()
    - x86/cpu/topology: Provide detect_extended_topology_early()
    - x86/cpu/intel: Evaluate smp_num_siblings early
    - x86/CPU/AMD: Do not check CPUID max ext level before parsing SMP info
    - x86/cpu/AMD: Evaluate smp_num_siblings early
    - x86/apic: Ignore secondary threads if nosmt=force
    - x86/speculation/l1tf: Extend 64bit swap file size limit
    - x86/cpufeatures: Add detection of L1D cache flush support.
    - x86/CPU/AMD: Move TOPOEXT reenablement before reading smp_num_siblings
    - x86/speculation/l1tf: Protect PAE swap entries against L1TF
    - x86/speculation/l1tf: Fix up pte->pfn conversion for PAE
    - Revert "x86/apic: Ignore secondary threads if nosmt=force"
    - cpu/hotplug: Boot HT siblings at least once
    - x86/KVM: Warn user if KVM is loaded SMT and L1TF CPU bug being present
    - x86/KVM/VMX: Add module argument for L1TF mitigation
    - x86/KVM/VMX: Add L1D flush algorithm
    - x86/KVM/VMX: Add L1D MSR based flush
    - x86/KVM/VMX: Add L1D flush logic
    - x86/KVM/VMX: Split the VMX MSR LOAD structures to have an host/guest numbers
    - x86/KVM/VMX: Add find_msr() helper function
    - x86/KVM/VMX: Separate the VMX AUTOLOAD guest/host number accounting
    - x86/KVM/VMX: Extend add_atomic_switch_msr() to allow VMENTER only MSRs
    - x86/KVM/VMX: Use MSR save list for IA32_FLUSH_CMD if required
    - cpu/hotplug: Online siblings when SMT control is turned on
    - x86/litf: Introduce vmx status variable
    - x86/kvm: Drop L1TF MSR list approach
    - x86/l1tf: Handle EPT disabled state proper
    - x86/kvm: Move l1tf setup function
    - x86/kvm: Add static key for flush always
    - x86/kvm: Serialize L1D flush parameter setter
    - x86/kvm: Allow runtime control of L1D flush
    - cpu/hotplug: Expose SMT control init function
    - cpu/hotplug: Set CPU_SMT_NOT_SUPPORTED early
    - x86/bugs, kvm: Introduce boot-time control of L1TF mitigations
    - Documentation: Add section about CPU vulnerabilities
    - x86/speculation/l1tf: Unbreak !__HAVE_ARCH_PFN_MODIFY_ALLOWED architectures
    - x86/KVM/VMX: Initialize the vmx_l1d_flush_pages' content
    - Documentation/l1tf: Fix typos
    - cpu/hotplug: detect SMT disabled by BIOS
    - x86/KVM/VMX: Don't set l1tf_flush_l1d to true from vmx_l1d_flush()
    - x86/KVM/VMX: Replace 'vmx_l1d_flush_always' with 'vmx_l1d_flush_cond'
    - x86/KVM/VMX: Move the l1tf_flush_l1d test to vmx_l1d_flush()
    - x86/irq: Demote irq_cpustat_t::__softirq_pending to u16
    - x86/KVM/VMX: Introduce per-host-cpu analogue of l1tf_flush_l1d
    - x86: Don't include linux/irq.h from asm/hardirq.h
    - x86/irq: Let interrupt handlers set kvm_cpu_l1tf_flush_l1d
    - x86/KVM/VMX: Don't set l1tf_flush_l1d from vmx_handle_external_intr()
    - Documentation/l1tf: Remove Yonah processors from not vulnerable list
    - x86/speculation: Simplify sysfs report of VMX L1TF vulnerability
    - x86/speculation: Use ARCH_CAPABILITIES to skip L1D flush on vmentry
    - KVM: VMX: Tell the nested hypervisor to skip L1D flush on vmentry
    - cpu/hotplug: Fix SMT supported evaluation
    - x86/speculation/l1tf: Invert all not present mappings
    - x86/speculation/l1tf: Make pmd/pud_mknotpresent() invert
    - x86/mm/pat: Make set_memory_np() L1TF safe
    - x86/mm/kmmio: Make the tracer robust against L1TF
    - tools headers: Synchronize prctl.h ABI header
    - tools headers: Synchronise x86 cpufeatures.h for L1TF additions
    - x86/microcode: Allow late microcode loading with SMT disabled
    - x86/smp: fix non-SMP broken build due to redefinition of
      apic_id_is_primary_thread
    - cpu/hotplug: Non-SMP machines do not make use of booted_once
    - x86/init: fix build with CONFIG_SWAP=n
    - x86/CPU/AMD: Have smp_num_siblings and cpu_llc_id always be present
    - Linux 4.17.15
    - [Config] updateconfigs after v4.17.15 stable update

  * Cosmic update to v4.17.14 stable release (LP: #1787031)
    - scsi: qla2xxx: Fix unintialized List head crash
    - scsi: qla2xxx: Fix NPIV deletion by calling wait_for_sess_deletion
    - scsi: qla2xxx: Fix driver unload by shutting down chip
    - scsi: qla2xxx: Fix ISP recovery on unload
    - scsi: qla2xxx: Return error when TMF returns
    - jfs: Fix usercopy whitelist for inline inode data
    - genirq: Make force irq threading setup more robust
    - perf/x86/intel/uncore: Fix hardcoded index of Broadwell extra PCI devices
    - nohz: Fix local_timer_softirq_pending()
    - nohz: Fix missing tick reprogram when interrupting an inline softirq
    - netlink: Don't shift on 64 for ngroups
    - ring_buffer: tracing: Inherit the tracing setting to next ring buffer
    - i2c: imx: Fix reinit_completion() use
    - Btrfs: fix file data corruption after cloning a range and fsync
    - Partially revert "block: fail op_is_write() requests to read-only
      partitions"
    - xfs: validate cached inodes are free when allocated
    - Linux 4.17.14

  * Consider enabling CONFIG_NETWORK_PHY_TIMESTAMPING (LP: #1785816)
    - [Config] Enable timestamping in network PHY devices

  * Cosmic update to 4.17.13 stable release (LP: #1785710)
    - bonding: avoid lockdep confusion in bond_get_stats()
    - inet: frag: enforce memory limits earlier
    - ipv4: frags: handle possible skb truesize change
    - net: dsa: Do not suspend/resume closed slave_dev
    - netlink: Fix spectre v1 gadget in netlink_create()
    - net: stmmac: Fix WoL for PCI-based setups
    - rxrpc: Fix user call ID check in rxrpc_service_prealloc_one
    - net/mlx5e: E-Switch, Initialize eswitch only if eswitch manager
    - net/mlx5e: Set port trust mode to PCP as default
    - net/mlx5e: IPoIB, Set the netdevice sw mtu in ipoib enhanced flow
    - squashfs: more metadata hardening
    - squashfs: more metadata hardenings
    - can: ems_usb: Fix memory leak on ems_usb_disconnect()
    - net: socket: fix potential spectre v1 gadget in socketcall
    - net: socket: Fix potential spectre v1 gadget in sock_is_registered
    - virtio_balloon: fix another race between migration and ballooning
    - x86/efi: Access EFI MMIO data as unencrypted when SEV is active
    - x86/apic: Future-proof the TSC_DEADLINE quirk for SKX
    - x86/entry/64: Remove %ebx handling from error_entry/exit
    - kvm: x86: vmx: fix vpid leak
    - audit: fix potential null dereference 'context->module.name'
    - ipc/shm.c add ->pagesize function to shm_vm_ops
    - userfaultfd: remove uffd flags from vma->vm_flags if UFFD_EVENT_FORK fails
    - iwlwifi: add more card IDs for 9000 series
    - brcmfmac: fix regression in parsing NVRAM for multiple devices
    - RDMA/uverbs: Expand primary and alt AV port checks
    - crypto: padlock-aes - Fix Nano workaround data corruption
    - drm/vc4: Reset ->{x, y}_scaling[1] when dealing with uniplanar formats
    - drm/atomic: Check old_plane_state->crtc in drm_atomic_helper_async_check()
    - drm/atomic: Initialize variables in drm_atomic_helper_async_check() to make
      gcc happy
    - scsi: sg: fix minor memory leak in error path
    - Linux 4.17.13

  * CacheFiles: Error: Overlong wait for old active object to go away.
    (LP: #1776254)
    - cachefiles: Fix missing clear of the CACHEFILES_OBJECT_ACTIVE flag
    - cachefiles: Wait rather than BUG'ing on "Unexpected object collision"

  * fscache cookie refcount updated incorrectly during fscache object allocation
    (LP: #1776277) // fscache cookie refcount updated incorrectly during fscache
    object allocation (LP: #1776277)
    - fscache: Fix reference overput in fscache_attach_object() error handling

  * FS-Cache: Assertion failed: FS-Cache: 6 == 5 is false (LP: #1774336)
    - Revert "UBUNTU: SAUCE: CacheFiles: fix a read_waiter/read_copier race"
    - fscache: Allow cancelled operations to be enqueued
    - cachefiles: Fix refcounting bug in backing-file read monitoring

  * Miscellaneous Ubuntu changes
    - [Config] CONFIG_SYSCTL_SYSCALL=n

 -- Thadeu Lima de Souza Cascardo <cascardo@xxxxxxxxxxxxx>  Mon, 20 Aug
2018 14:37:36 -0300

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

** CVE added: https://cve.mitre.org/cgi-bin/cvename.cgi?name=2018-9363

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https://bugs.launchpad.net/bugs/1776277

Title:
  fscache cookie refcount updated incorrectly during fscache object
  allocation

Status in linux package in Ubuntu:
  Fix Released
Status in linux source package in Trusty:
  Fix Committed
Status in linux source package in Xenial:
  Fix Committed
Status in linux source package in Bionic:
  Fix Committed

Bug description:
  == SRU Justification ==

  [Impact]
  Oops during heavy NFS + FSCache + Cachefiles use:

   kernel BUG at /build/linux-Y09MKI/linux-4.4.0/fs/fscache/internal.h:321!
   kernel BUG at /build/linux-Y09MKI/linux-4.4.0/fs/fscache/cookie.c:639!

  [Cause]
   1)Two threads are trying to do operate on a cookie and two objects.
   2a)One thread tries to unmount the filesystem and in process goes over
     a huge list of objects marking them dead and deleting the objects.
     cookie->usage is also decremented in following path
        nfs_fscache_release_super_cookie
         -> __fscache_relinquish_cookie
          ->__fscache_cookie_put
          ->BUG_ON(atomic_read(&cookie->usage) <= 0);

   2b)second thread tries to lookup an object for reading data in
      following path
   
       fscache_alloc_object
        1) cachefiles_alloc_object
            -> fscache_object_init 
              -> assign cookie, but usage not bumped.
       2) fscache_attach_object -> fails in cant_attach_object because the 
          cookie's backing object or cookie's->parent object are going away
       3)fscache_put_object
             -> cachefiles_put_object
              ->fscache_object_destroy
                ->fscache_cookie_put
                 ->BUG_ON(atomic_read(&cookie->usage) <= 0);
  [Fix]
   Bump up the cookie usage in fscache_object_init,
   when it is first being assigned a cookie atomically such that the cookie
   is added and bumped up if its refcount is not zero.
   remove the assignment in the attach_object.

  [Testcase]
  A user has run ~100 hours of NFS stress tests and not seen this bug recur.

  [Regression Potential]
   - Limited to fscache/cachefiles.

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