proc_keys_show crash when reading /proc/keys

Verified that this is fixed in all -proposed kernels. In precise /proc/keys is not present as a result of CONFIG_KEYS_DEBUG_PROC_KEYS=n, however it's a trivial fix and there's no harm in carrying the patch.

This bug was fixed in the package linux - 3.2.0-115.157

---------------
linux (3.2.0-115.157) precise; urgency=low

  [ Seth Forshee ]

  * Release Tracking Bug
    - LP: #1636537

  * CVE-2016-5195
    - Revert "UBUNTU:SAUCE: mm: remove gup_flags FOLL_WRITE games from
      __get_user_pages()"
    - mm, gup: close FOLL MAP_PRIVATE race

linux (3.2.0-114.156) precise; urgency=low

  [ Seth Forshee ]

  * Release Tracking Bug
    - LP: #1635436

  * proc_keys_show crash when reading /proc/keys (LP: #1634496)
    - SAUCE: KEYS: ensure xbuf is large enough to fix buffer overflow in
      proc_keys_show (LP: #1634496)

  * CVE-2016-7117
    - net: Fix use after free in the recvmmsg exit path

  * CVE-2015-7833
    - usbvision: revert commit 588afcc1

 -- Seth Forshee <email address hidden> Tue, 25 Oct 2016 09:58:32 -0500

This bug was fixed in the package linux - 3.13.0-101.148

---------------
linux (3.13.0-101.148) trusty; urgency=low

  [ Seth Forshee ]

  * Release Tracking Bug
    - LP: #1635430

  * [arm64] nova instances can't boot with 3.13.0-92 (LP: #1608854)
    - Revert "efi: Disable interrupts around EFI calls, not in the epilog/prolog
      calls"
    - Revert "x86/efi: Use all 64 bit of efi_memmap in setup_e820()"
    - Revert "x86/efi: Store upper bits of command line buffer address in
      ext_cmd_line_ptr"
    - Revert "efivarfs: Ensure VariableName is NUL-terminated"
    - Revert "efi/libstub: Fix boundary checking in efi_high_alloc()"
    - Revert "arm64: efi: only attempt efi map setup if booting via EFI"
    - Revert "UBUNTU: arm64: Implement efi_enabled()"
    - Revert "efi/arm64: ignore dtb= when UEFI SecureBoot is enabled"
    - Revert "doc: arm64: add description of EFI stub support"
    - Revert "UBUNTU: Move get_dram_base to arm private file"
    - Revert "arm64: efi: add EFI stub"
    - Revert "arm64: add EFI runtime services"
    - Revert "efi: Add shared FDT related functions for ARM/ARM64"
    - Revert "efi: add helper function to get UEFI params from FDT"
    - Revert "doc: efi-stub.txt updates for ARM"
    - Revert "efi: Add get_dram_base() helper function"
    - Revert "efi: create memory map iteration helper"
    - Revert "x86, ia64: Move EFI_FB vga_default_device() initialization to
      pci_vga_fixup()"
    - Revert "firmware: Do not use WARN_ON(!spin_is_locked())"
    - Revert "efi-pstore: Fix an overflow on 32-bit builds"
    - Revert "x86/efi: Fix 32-bit fallout"
    - Revert "x86/efi: Check krealloc return value"
    - Revert "x86/efi: Runtime services virtual mapping"
    - Revert "x86/efi: Fix off-by-one bug in EFI Boot Services reservation"
    - x86/efi: Simplify EFI_DEBUG
    - x86/efi: Runtime services virtual mapping
    - x86/efi: Check krealloc return value
    - SAUCE: Merge tag 'efi-next' of
      git://git.kernel.org/pub/scm/linux/kernel/git/mfleming/efi into x86/efi
    - doc: Fix trivial spelling mistake in efi-stub.txt
    - x86/efi: Remove unused variables in __map_region()
    - x86/efi: Add a wrapper function efi_map_region_fixed()
    - x86/efi: Fix off-by-one bug in EFI Boot Services reservation
    - x86/efi: Cleanup efi_enter_virtual_mode() function
    - efi: Export more EFI table variables to sysfs
    - [Config] CONFIG_EFI_RUNTIME_MAP=y
    - efi: Export EFI runtime memory mapping to sysfs
    - x86/efi: Pass necessary EFI data for kexec via setup_data
    - x86/efi: Delete superfluous global variables
    - x86/efi: parse_efi_setup() build fix
    - SAUCE: Merge tag 'v3.13-rc7' into x86/efi-kexec to resolve conflicts
    - x86/efi: Allow mapping BGRT on x86-32
    - x86/efi: Fix 32-bit fallout
    - x86/efi: Check status field to validate BGRT header
    - x86/efi: Quirk out SGI UV
    - v3.14 - Bacported EFI up to v3.14
    - efi: Move facility flags to struct efi
    - efi: Set feature flags inside feature init functions
    - efivarfs: 'efivarfs_file_write' function reorganization
    - x86/efi: Delete out-of-date comments of efi_query_variable_store
    - x86/efi: Style neatening
    - x8...

This bug was fixed in the package linux - 3.19.0-74.82

---------------
linux (3.19.0-74.82) vivid; urgency=low

  [ Seth Forshee ]

  * Release Tracking Bug
    - LP: #1635424

  * proc_keys_show crash when reading /proc/keys (LP: #1634496)
    - SAUCE: KEYS: ensure xbuf is large enough to fix buffer overflow in
      proc_keys_show (LP: #1634496)

  * CVE-2015-7833
    - usbvision: revert commit 588afcc1

  * CVE-2015-7837
    - SAUCE: (no-up) kexec/uefi: copy secure_boot flag in boot params across kexec
      reboot

 -- Seth Forshee <email address hidden> Thu, 20 Oct 2016 16:26:38 -0500

This bug was fixed in the package linux - 4.4.0-47.68

---------------
linux (4.4.0-47.68) xenial; urgency=low

  [ Kamal Mostafa ]

  * Release Tracking Bug
    - LP: #1636941

  * Add a driver for Amazon Elastic Network Adapters (ENA) (LP: #1635721)
    - lib/bitmap.c: conversion routines to/from u32 array
    - net: ethtool: add new ETHTOOL_xLINKSETTINGS API
    - net: ena: Add a driver for Amazon Elastic Network Adapters (ENA)
    - [config] enable CONFIG_ENA_ETHERNET=m (Amazon ENA driver)

  * unexpectedly large memory usage of mounted snaps (LP: #1636847)
    - [Config] switch squashfs to single threaded decode

 -- Kamal Mostafa <email address hidden> Wed, 26 Oct 2016 10:47:55 -0700

This bug was fixed in the package linux - 4.8.0-27.29

---------------
linux (4.8.0-27.29) yakkety; urgency=low

  [ Seth Forshee ]

  * Release Tracking Bug
    - LP: #1635377

  * proc_keys_show crash when reading /proc/keys (LP: #1634496)
    - SAUCE: KEYS: ensure xbuf is large enough to fix buffer overflow in
      proc_keys_show (LP: #1634496)

  * Revert "If zone is so small that watermarks are the same, stop zone balance"
    in yakkety (LP: #1632894)
    - Revert "UBUNTU: SAUCE: (no-up) If zone is so small that watermarks are the
      same, stop zone balance."

  * lts-yakkety 4.8 cannot mount lvm raid1 (LP: #1631298)
    - SAUCE: (no-up) dm raid: fix compat_features validation

  * kswapd0 100% CPU usage (LP: #1518457)
    - SAUCE: (no-up) If zone is so small that watermarks are the same, stop zone
      balance.

  * [Trusty->Yakkety] powerpc/64: Fix incorrect return value from
    __copy_tofrom_user (LP: #1632462)
    - SAUCE: (no-up) powerpc/64: Fix incorrect return value from
      __copy_tofrom_user

  * Ubuntu 16.10: Oops panic in move_page_tables/page_remove_rmap after running
    memory_stress_ng. (LP: #1628976)
    - SAUCE: (no-up) powerpc/pseries: Fix stack corruption in htpe code

  * Paths not failed properly when unmapping virtual FC ports in VIOS (using
    ibmvfc) (LP: #1632116)
    - scsi: ibmvfc: Fix I/O hang when port is not mapped

  * [Ubuntu16.10]KV4.8: kernel livepatch config options are not set
    (LP: #1626983)
    - [Config] Enable live patching on powerpc/ppc64el

  * CONFIG_AUFS_XATTR is not set (LP: #1557776)
    - [Config] CONFIG_AUFS_XATTR=y

  * Yakkety update to 4.8.1 stable release (LP: #1632445)
    - arm64: debug: avoid resetting stepping state machine when TIF_SINGLESTEP
    - Using BUG_ON() as an assert() is _never_ acceptable
    - usb: misc: legousbtower: Fix NULL pointer deference
    - Staging: fbtft: Fix bug in fbtft-core
    - usb: usbip: vudc: fix left shift overflow
    - USB: serial: cp210x: Add ID for a Juniper console
    - Revert "usbtmc: convert to devm_kzalloc"
    - ALSA: hda - Adding one more ALC255 pin definition for headset problem
    - ALSA: hda - Fix headset mic detection problem for several Dell laptops
    - ALSA: hda - Add the top speaker pin config for HP Spectre x360
    - Linux 4.8.1

  * PSL data cache should be flushed before resetting CAPI adapter
    (LP: #1632049)
    - cxl: Flush PSL cache before resetting the adapter

  * thunder nic: avoid link delays due to RX_PACKET_DIS (LP: #1630038)
    - net: thunderx: Don't set RX_PACKET_DIS while initializing

  * crypto/vmx/p8_ghash memory corruption (LP: #1630970)
    - crypto: ghash-generic - move common definitions to a new header file
    - crypto: vmx - Fix memory corruption caused by p8_ghash
    - crypto: vmx - Ensure ghash-generic is enabled

  * arm64: SPCR console not autodetected (LP: #1630311)
    - of/serial: move earlycon early_param handling to serial
    - [Config] CONFIG_ACPI_SPCR_TABLE=y
    - ACPI: parse SPCR and enable matching console
    - ARM64: ACPI: enable ACPI_SPCR_TABLE
    - serial: pl011: add console matching function

  * include/linux/security.h header syntax error with !CONFIG_SECURITYFS
...