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** Branch linked: lp:ubuntu/precise-proposed/linux-lts-saucy

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https://bugs.launchpad.net/bugs/1243636

Title:
  ecryptfs corrupts files over 4GB size on i686

Status in eCryptfs:
  Fix Committed
Status in “linux” package in Ubuntu:
  In Progress

Bug description:
  [SRU Justification]

  Commit 24d15266bd86b7961f309a962fa3aa177a78c49f introduced a data corruption
  regression on 32 bit architectures when writing past the 4 GB.

  [Impact]

  32 bit users experience corruption of large files.

  [Fix]

  A cast is needed when shifting the page's index. Colin and I independently
  identified the problem. It is a simple fix that has been merged upstream:

  http://git.kernel.org/linus/43b7c6c6a4e3916edd186ceb61be0c67d1e0969e

  [Test Case]

  Inside of an eCryptfs mount on an i686 Ubuntu install, create a file containing
  4 GB + 1 page worth (4096 bytes) of zeros. Then inspect the file for non-zero
  bytes.

  $ rm zeros
  $ dd if=/dev/zero of=zeros bs=4096 count=$((4*1024*1024*1024/4096+4096))
  1052672+0 records in
  1052672+0 records out
  4311744512 bytes (4.3 GB) copied, 226.133 s, 19.1 MB/s
  $ hexdump -C zeros
  00000000  00 00 00 00 00 00 00 00  00 00 00 00 00 00 00 00  |................|
  *
  101000000

  The hexdump output should show all zeros. A non patched kernel will show
  non-zero bytes.

  [Original Bug Report]

  on extracting files with extracted size >4 GB files are getting currupted.
  interestingly file gets currupted in the very moment the file size gets more than 4GB.

  ProblemType: Bug
  DistroRelease: Ubuntu 13.10
  Package: linux-image-3.11.0-12-generic 3.11.0-12.19
  ProcVersionSignature: Ubuntu 3.11.0-12.19-generic 3.11.3
  Uname: Linux 3.11.0-12-generic i686
  ApportVersion: 2.12.5-0ubuntu2
  Architecture: i386
  Date: Wed Oct 23 12:11:43 2013
  EcryptfsInUse: Yes
  InstallationDate: Installed on 2013-07-20 (94 days ago)
  InstallationMedia: Ubuntu 13.04 "Raring Ringtail" - Release i386 (20130424)
  MarkForUpload: True
  ProcEnviron:
   TERM=xterm
   PATH=(custom, no user)
   XDG_RUNTIME_DIR=<set>
   LANG=de_DE.UTF-8
   SHELL=/bin/bash
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.11.0-12-generic root=UUID=e97431f7-60b7-4fbe-b22f-5ca3304f2d50 ro quiet splash vt.handoff=7
  SourcePackage: linux
  UpgradeStatus: Upgraded to saucy on 2013-09-08 (45 days ago)

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