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[Launchpad Bug Tracker <1567597@xxxxxxxxxxxxxxxxxx>]

This bug was fixed in the package linux - 4.4.0-98.121

---------------
linux (4.4.0-98.121) xenial; urgency=low

  * linux: 4.4.0-98.121 -proposed tracker (LP: #1722299)

  * Controller lockup detected on ProLiant DL380 Gen9 with P440 Controller
    (LP: #1720359)
    - scsi: hpsa: limit transfer length to 1MB

  * [Dell Docking IE][0bda:8153] Realtek USB Ethernet leads to system hang
    (LP: #1720977)
    - r8152: fix the list rx_done may be used without initialization

  * Add installer support for Broadcom BCM573xx network drivers. (LP: #1720466)
    - d-i: Add bnxt_en to nic-modules.

  * snapcraft.yaml: add dpkg-dev to the build deps (LP: #1718886)
    - snapcraft.yaml: add dpkg-dev to the build deps

  * Support setting I2C_TIMEOUT via ioctl for i2c-designware (LP: #1718578)
    - i2c: designware: Use transfer timeout from ioctl I2C_TIMEOUT

  * 5U84 - ses driver isn't binding right - cannot blink lights on 1 of the 2
    5u84 (LP: #1693369)
    - scsi_transport_sas: add function to get SAS endpoint address
    - ses: fix discovery of SATA devices in SAS enclosures
    - scsi: sas: provide stub implementation for scsi_is_sas_rphy
    - scsi: ses: Fix SAS device detection in enclosure

  * multipath -ll is not showing the disks which are actually multipath
    (LP: #1718397)
    - fs: aio: fix the increment of aio-nr and counting against aio-max-nr

  * Support Dell Wireless DW5819/5818 WWAN devices (LP: #1721455)
    - SAUCE: USB: serial: qcserial: add Dell DW5818, DW5819

  * CVE-2017-10911
    - xen-blkback: don't leak stack data via response ring

  * implement 'complain mode' in seccomp for developer mode with snaps
    (LP: #1567597)
    - seccomp: Provide matching filter for introspection
    - seccomp: Sysctl to display available actions
    - seccomp: Operation for checking if an action is available
    - seccomp: Sysctl to configure actions that are allowed to be logged
    - seccomp: Selftest for detection of filter flag support
    - seccomp: Action to log before allowing

  * implement errno action logging in seccomp for strict mode with snaps
    (LP: #1721676)
    - seccomp: Provide matching filter for introspection
    - seccomp: Sysctl to display available actions
    - seccomp: Operation for checking if an action is available
    - seccomp: Sysctl to configure actions that are allowed to be logged
    - seccomp: Selftest for detection of filter flag support
    - seccomp: Filter flag to log all actions except SECCOMP_RET_ALLOW

  * [Xenial] update OpenNSL kernel modules to 6.5.10 (LP: #1721511)
    - SAUCE: update OpenNSL kernel modules to 6.5.10

  * Xenial update to 4.4.90 stable release (LP: #1721550)
    - cifs: release auth_key.response for reconnect.
    - mac80211: flush hw_roc_start work before cancelling the ROC
    - KVM: PPC: Book3S: Fix race and leak in kvm_vm_ioctl_create_spapr_tce()
    - tracing: Fix trace_pipe behavior for instance traces
    - tracing: Erase irqsoff trace with empty write
    - md/raid5: fix a race condition in stripe batch
    - md/raid5: preserve STRIPE_ON_UNPLUG_LIST in break_stripe_batch_list
    - scsi: scsi_transport_iscsi: fix the issue that iscsi_if_rx doesn't parse
      nlmsg properly
    - crypto: talitos - Don't provide setkey for non hmac hashing algs.
    - crypto: talitos - fix sha224
    - KEYS: fix writing past end of user-supplied buffer in keyring_read()
    - KEYS: prevent creating a different user's keyrings
    - KEYS: prevent KEYCTL_READ on negative key
    - powerpc/pseries: Fix parent_dn reference leak in add_dt_node()
    - Fix SMB3.1.1 guest authentication to Samba
    - SMB: Validate negotiate (to protect against downgrade) even if signing off
    - SMB3: Don't ignore O_SYNC/O_DSYNC and O_DIRECT flags
    - vfs: Return -ENXIO for negative SEEK_HOLE / SEEK_DATA offsets
    - nl80211: check for the required netlink attributes presence
    - bsg-lib: don't free job in bsg_prepare_job
    - seccomp: fix the usage of get/put_seccomp_filter() in seccomp_get_filter()
    - arm64: Make sure SPsel is always set
    - arm64: fault: Route pte translation faults via do_translation_fault
    - KVM: VMX: Do not BUG() on out-of-bounds guest IRQ
    - kvm: nVMX: Don't allow L2 to access the hardware CR8
    - PCI: Fix race condition with driver_override
    - btrfs: fix NULL pointer dereference from free_reloc_roots()
    - btrfs: propagate error to btrfs_cmp_data_prepare caller
    - btrfs: prevent to set invalid default subvolid
    - x86/fpu: Don't let userspace set bogus xcomp_bv
    - gfs2: Fix debugfs glocks dump
    - timer/sysclt: Restrict timer migration sysctl values to 0 and 1
    - KVM: VMX: do not change SN bit in vmx_update_pi_irte()
    - KVM: VMX: remove WARN_ON_ONCE in kvm_vcpu_trigger_posted_interrupt
    - cxl: Fix driver use count
    - dmaengine: mmp-pdma: add number of requestors
    - ARM: pxa: add the number of DMA requestor lines
    - ARM: pxa: fix the number of DMA requestor lines
    - KVM: VMX: use cmpxchg64
    - video: fbdev: aty: do not leak uninitialized padding in clk to userspace
    - swiotlb-xen: implement xen_swiotlb_dma_mmap callback
    - fix xen_swiotlb_dma_mmap prototype
    - Linux 4.4.90

  * Xenial update to 4.4.89 stable release (LP: #1721477)
    - ipv6: accept 64k - 1 packet length in ip6_find_1stfragopt()
    - ipv6: add rcu grace period before freeing fib6_node
    - ipv6: fix sparse warning on rt6i_node
    - qlge: avoid memcpy buffer overflow
    - Revert "net: phy: Correctly process PHY_HALTED in phy_stop_machine()"
    - Revert "net: use lib/percpu_counter API for fragmentation mem accounting"
    - Revert "net: fix percpu memory leaks"
    - gianfar: Fix Tx flow control deactivation
    - ipv6: fix memory leak with multiple tables during netns destruction
    - ipv6: fix typo in fib6_net_exit()
    - f2fs: check hot_data for roll-forward recovery
    - x86/fsgsbase/64: Report FSBASE and GSBASE correctly in core dumps
    - md/raid5: release/flush io in raid5_do_work()
    - nfsd: Fix general protection fault in release_lock_stateid()
    - mm: prevent double decrease of nr_reserved_highatomic
    - tty: improve tty_insert_flip_char() fast path
    - tty: improve tty_insert_flip_char() slow path
    - tty: fix __tty_insert_flip_char regression
    - Input: i8042 - add Gigabyte P57 to the keyboard reset table
    - MIPS: math-emu: <MAX|MAXA|MIN|MINA>.<D|S>: Fix quiet NaN propagation
    - MIPS: math-emu: <MAX|MAXA|MIN|MINA>.<D|S>: Fix cases of both inputs zero
    - MIPS: math-emu: <MAX|MIN>.<D|S>: Fix cases of both inputs negative
    - MIPS: math-emu: <MAXA|MINA>.<D|S>: Fix cases of input values with opposite
      signs
    - MIPS: math-emu: <MAXA|MINA>.<D|S>: Fix cases of both infinite inputs
    - MIPS: math-emu: MINA.<D|S>: Fix some cases of infinity and zero inputs
    - crypto: AF_ALG - remove SGL terminator indicator when chaining
    - ext4: fix incorrect quotaoff if the quota feature is enabled
    - ext4: fix quota inconsistency during orphan cleanup for read-only mounts
    - powerpc: Fix DAR reporting when alignment handler faults
    - block: Relax a check in blk_start_queue()
    - md/bitmap: disable bitmap_resize for file-backed bitmaps.
    - skd: Avoid that module unloading triggers a use-after-free
    - skd: Submit requests to firmware before triggering the doorbell
    - scsi: zfcp: fix queuecommand for scsi_eh commands when DIX enabled
    - scsi: zfcp: add handling for FCP_RESID_OVER to the fcp ingress path
    - scsi: zfcp: fix capping of unsuccessful GPN_FT SAN response trace records
    - scsi: zfcp: fix passing fsf_req to SCSI trace on TMF to correlate with HBA
    - scsi: zfcp: fix missing trace records for early returns in TMF eh handlers
    - scsi: zfcp: fix payload with full FCP_RSP IU in SCSI trace records
    - scsi: zfcp: trace HBA FSF response by default on dismiss or timedout late
      response
    - scsi: zfcp: trace high part of "new" 64 bit SCSI LUN
    - scsi: megaraid_sas: Check valid aen class range to avoid kernel panic
    - scsi: megaraid_sas: Return pended IOCTLs with cmd_status
      MFI_STAT_WRONG_STATE in case adapter is dead
    - scsi: storvsc: fix memory leak on ring buffer busy
    - scsi: sg: remove 'save_scat_len'
    - scsi: sg: use standard lists for sg_requests
    - scsi: sg: off by one in sg_ioctl()
    - scsi: sg: factor out sg_fill_request_table()
    - scsi: sg: fixup infoleak when using SG_GET_REQUEST_TABLE
    - scsi: qla2xxx: Fix an integer overflow in sysfs code
    - ftrace: Fix selftest goto location on error
    - tracing: Apply trace_clock changes to instance max buffer
    - ARC: Re-enable MMU upon Machine Check exception
    - PCI: shpchp: Enable bridge bus mastering if MSI is enabled
    - media: v4l2-compat-ioctl32: Fix timespec conversion
    - media: uvcvideo: Prevent heap overflow when accessing mapped controls
    - bcache: initialize dirty stripes in flash_dev_run()
    - bcache: Fix leak of bdev reference
    - bcache: do not subtract sectors_to_gc for bypassed IO
    - bcache: correct cache_dirty_target in __update_writeback_rate()
    - bcache: Correct return value for sysfs attach errors
    - bcache: fix for gc and write-back race
    - bcache: fix bch_hprint crash and improve output
    - ftrace: Fix memleak when unregistering dynamic ops when tracing disabled
    - Linux 4.4.89

  * ETPS/2 Elantech Touchpad inconsistently detected (Gigabyte P57W laptop)
    (LP: #1594214)
    - Input: i8042 - add Gigabyte P57 to the keyboard reset table

  * Xenial update to 4.4.88 stable release (LP: #1718195)
    - usb: quirks: add delay init quirk for Corsair Strafe RGB keyboard
    - USB: serial: option: add support for D-Link DWM-157 C1
    - usb: Add device quirk for Logitech HD Pro Webcam C920-C
    - usb:xhci:Fix regression when ATI chipsets detected
    - USB: core: Avoid race of async_completed() w/ usbdev_release()
    - staging/rts5208: fix incorrect shift to extract upper nybble
    - driver core: bus: Fix a potential double free
    - intel_th: pci: Add Cannon Lake PCH-H support
    - intel_th: pci: Add Cannon Lake PCH-LP support
    - ath10k: fix memory leak in rx ring buffer allocation
    - rtlwifi: rtl_pci_probe: Fix fail path of _rtl_pci_find_adapter
    - Bluetooth: Add support of 13d3:3494 RTL8723BE device
    - dlm: avoid double-free on error path in dlm_device_{register,unregister}
    - mwifiex: correct channel stat buffer overflows
    - drm/nouveau/pci/msi: disable MSI on big-endian platforms by default
    - workqueue: Fix flag collision
    - cs5536: add support for IDE controller variant
    - scsi: sg: protect against races between mmap() and SG_SET_RESERVED_SIZE
    - scsi: sg: recheck MMAP_IO request length with lock held
    - drm: adv7511: really enable interrupts for EDID detection
    - drm/bridge: adv7511: Fix mutex deadlock when interrupts are disabled
    - drm/bridge: adv7511: Use work_struct to defer hotplug handing to out of irq
      context
    - drm/bridge: adv7511: Switch to using drm_kms_helper_hotplug_event()
    - drm/bridge: adv7511: Re-write the i2c address before EDID probing
    - btrfs: resume qgroup rescan on rw remount
    - locktorture: Fix potential memory leak with rw lock test
    - ALSA: msnd: Optimize / harden DSP and MIDI loops
    - ARM: 8692/1: mm: abort uaccess retries upon fatal signal
    - NFS: Fix 2 use after free issues in the I/O code
    - xfs: XFS_IS_REALTIME_INODE() should be false if no rt device present
    - Linux 4.4.88

  * Kernel has troule recognizing Corsair Strafe RGB keyboard (LP: #1678477)
    - usb: quirks: add delay init quirk for Corsair Strafe RGB keyboard

 -- Thadeu Lima de Souza Cascardo <cascardo@xxxxxxxxxxxxx>  Tue, 10 Oct
2017 08:52:24 -0300

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

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

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https://bugs.launchpad.net/bugs/1567597

Title:
  implement 'complain mode' in seccomp for developer mode with snaps

Status in Snappy:
  In Progress
Status in libseccomp package in Ubuntu:
  Fix Released
Status in linux package in Ubuntu:
  Fix Released
Status in libseccomp source package in Xenial:
  In Progress
Status in linux source package in Xenial:
  Fix Released
Status in libseccomp source package in Zesty:
  Fix Released
Status in linux source package in Zesty:
  Fix Released

Bug description:
  A requirement for snappy is that a snap may be placed in developer
  mode which will put the security sandbox in complain mode such that
  violations against policy are logged, but permitted. In this manner
  learning tools can be written to parse the logs, etc and make
  developing on snappy easier.

  Unfortunately with seccomp only SCMP_ACT_KILL logs to dmesg and while
  we can set complain mode to permit all calls, they are not logged at
  this time. I've discussed this with upstream and we are working
  together on the approach. This may require a kernel patch and an
  update to libseccomp, to filing this bug for now as a placeholder and
  we'll add other tasks as necessary.

  UPDATE: ubuntu-core-launcher now supports the '@complain' directive
  that is a synonym for '@unrestricted' so people can at least turn on
  developer mode and not be blocked by seccomp. Proper complain mode for
  seccomp needs to still be implemented (this bug).

  [Impact]

  Snapd needs a way to log seccomp actions without blocking any syscalls
  in order to have a more useful complain mode. Such functionality has
  been acked upstream and patches are on their way into the Linux 4.14
  kernel (backported to 4.12.0-13.14 in artful).

  The corresponding libseccomp changes are still undergoing review
  (https://github.com/seccomp/libseccomp/pull/92). The pull request adds
  a number of new symbols and probably isn't appropriate to backport
  until upstream has acked the pull request. However, only a small part
  of that larger pull request is needed by snapd and that change can be
  safely backported since the only added symbol, the SCMP_ACT_LOG macro,
  must match the SECCOMP_RET_LOG macro that has already been approved
  and merged in the upstream Linux kernel.

  [libseccomp Test Case]

  A large number of tests are ran as part of the libseccomp build.
  However, the "live" tests which test libseccomp with actual kernel
  enforcement are not ran at that time. They can be manually exercised
  to help catch any regressions. Note that on Artful, there's an
  existing test failure (20-live-basic_die%%002-00001):

  $ sudo apt build-dep -y libseccomp
  $ sudo apt install -y cython
  $ apt source libseccomp
  $ cd libseccomp-*
  $ autoreconf -ivf && ./configure --enable-python && make check-build
  $ (cd tests && ./regression -T live)

  All tests should pass on zesty (12 tests) and xenial (10 tests). On artful, you'll see one pre-existing failure:
  ...
  Test 20-live-basic_die%%002-00001 result:   FAILURE 20-live-basic_die TRAP rc=159
  ...
  Regression Test Summary
   tests run: 12
   tests skipped: 0
   tests passed: 11
   tests failed: 1
   tests errored: 0
  ============================================================

  ----------------------------

  Now we can build and run a small test program to test the SCMP_ACT_LOG
  action in the way that snapd wants to use it for developer mode:

  $ sudo apt install -y libseccomp-dev
  $ gcc -o lp1567597-test lp1567597-test.c -lseccomp
  $ ./lp1567597-test

  With a kernel that contains the logging patches and an updated
  libseccomp, the exit code should be 0 and you should have an entry in
  the system log that looks like this:

  audit: type=1326 audit(1505859630.994:69): auid=1000 uid=1000 gid=1000
  ses=2 pid=18451 comm="lp1567597-test"
  exe="/home/tyhicks/lp1567597-test" sig=0 arch=c000003e syscall=2
  compat=0 ip=0x7f547352c5c0 code=0x7ffc0000

  If you have an updated libseccomp with an old kernel, you'll see that
  seccomp_init() fails due to the added compatibility check inside of
  libseccomp determines that the kernel doesn't have proper support for
  the new log action:

  $ ./lp1567597-test
  ERROR: seccomp_init: Invalid argument

  [Linux Kernel Test Case]

  All of the libseccomp test cases apply here.

  ----------------------------

  Running the seccomp kernel selftests is also a great to exercise
  seccomp and the kernel patch set proposed for the SRU includes
  additional seccomp selftests. To build, enter into the root of the
  kernel source tree and build the seccomp test binary:

  $ make -C tools/testing/selftests TARGETS=seccomp

  Now you can execute tools/testing/selftests/seccomp/seccomp_bpf or
  even copy it to a test machine and run it there. On Xenial, 54/54
  tests should pass and 58/58 should pass on Zesty.

  ----------------------------

  Now we can run a single test to verify that SECCOMP_RET_LOG is logged
  when the seccomp BPF evaluates to that action. First, verify that
  "log" is listed in the actions_logged sysctl:

  $ cat /proc/sys/kernel/seccomp/actions_logged
  kill trap errno trace log

  Now, build and run the test program:

  $ gcc -o lp1567597-kernel-test lp1567597-kernel-test.c
  $ ./1567597-kernel-test
  SUCCESS!

  It should have generated a message like this in /var/log/syslog:

  audit: type=1326 audit(1507263417.752:60): auid=1000 uid=1000 gid=1000
  ses=2 pid=3117 comm="lp1567597-kerne" exe="/home/tyhicks/lp1567597
  -kernel-test" sig=0 arch=c000003e syscall=39 compat=0
  ip=0x7f1d2d8409f9 code=0x7ffc0000

  Disable "log" logging in the sysctl:

  $ echo kill trap errno trace | sudo tee /proc/sys/kernel/seccomp/actions_logged
  kill trap errno trace

  Rerun the test program and ensure that nothing was logged this time.

  [Regression Potential]

  Relatively small for libseccomp since the core logic is in the kernel
  and we're only exposing the new action through libseccomp. The changes
  include smarts to query the kernel to see if the action is available
  in the kernel. Calling applications will not be able to use the action
  on older kernels that don't support it.

  The kernel patches received a lot of review between Kees and some
  others interested in improved seccomp logging. I authored the patches
  and feel comfortable/confident with my backported versions. They do
  not change the behavior of seccomp logging by default but offer ways
  applications to opt into more logging and, on the flipside, ways for
  the administrator to quiet any additional logging.

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