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Message #30159
[Bug 1243636] Re: ecryptfs corrupts files over 4GB size on i686
** Branch linked: lp:ubuntu/saucy-proposed/linux-exynos5
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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:
Fix Committed
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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References