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[Launchpad Bug Tracker <1634496@xxxxxxxxxxxxxxxxxx>]

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 <kamal@xxxxxxxxxxxxx>  Wed, 26 Oct 2016 10:47:55 -0700

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

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

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https://bugs.launchpad.net/bugs/1634496

Title:
  proc_keys_show crash when reading /proc/keys

Status in Linux:
  Unknown
Status in linux package in Ubuntu:
  In Progress
Status in linux source package in Precise:
  Fix Released
Status in linux source package in Trusty:
  Fix Released
Status in linux source package in Vivid:
  Fix Released
Status in linux source package in Xenial:
  Fix Released
Status in linux source package in Yakkety:
  Fix Released

Bug description:
  Running stress-ng /proc test trips the following crash:

  [ 5315.044206] Kernel panic - not syncing: stack-protector: Kernel stack is corrupted in: ffffffff8956b1ae
  [ 5315.044206] 
  [ 5315.044883] CPU: 0 PID: 4820 Comm:  Tainted: P           OE   4.8.0-25-generic #27-Ubuntu
  [ 5315.045361] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS Ubuntu-1.8.2-1ubuntu2 04/01/2014
  [ 5315.045911]  0000000000000086 00000000b337622b ffff8fe574f37c78 ffffffff8962f5d2
  [ 5315.046371]  00000000b3405b00 ffffffff89e83530 ffff8fe574f37d00 ffffffff8939e71c
  [ 5315.046841]  ffff8fe500000010 ffff8fe574f37d10 ffff8fe574f37ca8 00000000b337622b
  [ 5315.047305] Call Trace:
  [ 5315.047457]  [<ffffffff8962f5d2>] dump_stack+0x63/0x81
  [ 5315.047763]  [<ffffffff8939e71c>] panic+0xe4/0x226
  [ 5315.048049]  [<ffffffff8956b1ae>] ? proc_keys_show+0x3ce/0x3d0
  [ 5315.048398]  [<ffffffff89282b89>] __stack_chk_fail+0x19/0x30
  [ 5315.048735]  [<ffffffff8956b1ae>] proc_keys_show+0x3ce/0x3d0
  [ 5315.049072]  [<ffffffff895686b0>] ? key_validate+0x50/0x50
  [ 5315.049396]  [<ffffffff89565d70>] ? key_default_cmp+0x20/0x20
  [ 5315.049737]  [<ffffffff89459832>] seq_read+0x102/0x3c0
  [ 5315.050042]  [<ffffffff894a6302>] proc_reg_read+0x42/0x70
  [ 5315.050363]  [<ffffffff89432448>] __vfs_read+0x18/0x40
  [ 5315.050674]  [<ffffffff89432ba6>] vfs_read+0x96/0x130
  [ 5315.050977]  [<ffffffff89434085>] SyS_read+0x55/0xc0
  [ 5315.051275]  [<ffffffff89a9f076>] entry_SYSCALL_64_fastpath+0x1e/0xa8
  [ 5315.051735] Kernel Offset: 0x8200000 from 0xffffffff81000000 (relocation range: 0xffffffff80000000-0xffffffffbfffffff)
  [ 5315.052563] ---[ end Kernel panic - not syncing: stack-protector: Kernel stack is corrupted in: ffffffff8956b1ae
  [ 5315.052563] 

  "The proc_keys_show function in security/keys/proc.c in the Linux
  kernel through 4.8.2, when the GNU Compiler Collection (gcc) stack
  protector is enabled, uses an incorrect buffer size for certain
  timeout data, which allows local users to cause a denial of service
  (stack memory corruption and panic) by reading the /proc/keys file."

  Fix detailed in: https://bugzilla.redhat.com/show_bug.cgi?id=1373966
  see: https://bugzilla.redhat.com/attachment.cgi?id=1200212&action=diff

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