Monday Apr 04, 2016

Announcing New Features for Ksplice

Offline Support for userspace patching is now available in Ksplice.

For customers hosting their own yum repositories, or those with restricted access to outside update channels, you can now integrate Ksplice userspace patches into your existing offline Ksplice patching procedures.  This expands the initial support with online patching capabilities and provides the maximum flexibility and choice for customers managing critical updates.

If you have wanted to use Ksplice for userspace but were restricted by the online service, you are now able to take full advantage of all the services and features available.

 Let us know what you think. 

Friday Mar 18, 2016

FRIDAY SPOTLIGHT: Saving time in a Cloud-Enabled DataCenter

Happy Friday everyone,

We have an awesome new  Oracle Infrastructure blog where we will be covering the Oracle Infrastructure products like, servers, engineered systems, OSes, storage and more. Subscribe to get the latest updates and news.


Here's the latest blog about "Saving time in a Cloud-Enabled DataCenter".

"When I talk to Linux administrators about the one thing they hate doing, it has to be patching. 

Certainly one of the reasons is finding a time to take a system down to patch is next to impossible. That usually means having to miss your kid’s soccer game, your favorite sports team’s match on TV, or a rare night out with friends.  And just how do you find time when you’re running systems in the cloud?  

That’s why Oracle KSplice is such a game-changer—it allows for zero-downtime kernel updates.  And that’s not even the whole story about Oracle Linux, with support for Docker, Linux Containers, OpenStack, Oracle Clusterware for High Availability (HA), and more—at no additional charge with an Oracle Linux Premier Support contract.  In addition to the Red Hat Compatible Kernel (RHCK), Oracle supplies the optimized Unbreakable Enterprise Kernel (UEK), which was first developed to support highly scalable Oracle Engineered Systems. ..."

Read more in the newly launched Oracle Infrastructure Blog.  

Thursday Mar 17, 2016

Training Thursdays: Simplified Ksplice Implementation in Oracle Linux Training

The implementation of Ksplice has been greatly simplified. Now you just need to register your system(s) with Unbreakable Linux Network (ULN), subscribe to the appropriate Ksplice channel, use the yum command to install the uptrack package, and perform any custom configuration. Your systems will be automatically updated with the latest kernel and user space patches.

You can learn about Ksplice and much more by taking the Oracle Linux 7: System Administration training. This course is available as a:

  • Live Virtual Event: Attend a live event from your own desk, no travel required. Choose from a selection of events on the schedule to suit different timezones including 14 and 28 March, 4 and 17 April, 9 May, 5 and 8 of June 2016.
  • In-Class Event: Travel to an education center to take a class. Below is a selection of the in-class events already on the schedule.

 Location  Date  Delivery Language
 Melbourne, Australia
 26 September 2016  English
 Sydney, Australia
 20 June 2016  English
 Vilvoorde, Belgium
 25 April 2016  English
 Brasilia, Brazil
 24 October 2016  Brazilian Portuguese
 Sao Paolo, Brazil
 28 March 2016  Brazilian Portuguese
 Bogota, Colombia
 4 April 2016  Spanish
 London, England
 13 June 2016  English
 Reading, England
 7 March 2016  English
 Paris, France
 6 June 2016  French
 Jakarta, Indonesia
 25 April 2016  English
 Milan, Italy
 19 September 2016  Italian
 Kuala Lumpur, Malaysia
 18 April 2016  English
 Makati City, Philippines
 18 April 2016  English
 Utrecht, Netherlands
 9 May 2016  English
 Capetown, South Africa
 9 May 2016  English
 Johannesburg, South Africa
 9 May 2016  English
 Pretoria, South Africa
 11 July 2016  English
 Bangkok, Thailand
 9 May 2016  English
 Abu Dhabi, United Arab Emirates
 10 July 2016  English
 Dubai, United Arab Emirates
 3 April 2016  English
 Dallas, TX, United States
 25 April 2016  English
 Roseville, MN, United States
 13 June 2016  English
 Belmont, CA, United States
 25 July 2016  English
 Albuquerque, NM, United States
 29 August 2016  English
 Reston, VA, United States  26 September 2016  English
 Miami, Fl, United States  17 October 2016  English
 Chicago, IL, United States  28 November 2016  English
 Dallas, TX, United States  28 November 2016  English

Those using earlier versions of Oracle Linux can learn about Ksplice and much more by taking the Oracle Linux 5 & 6: System Administration course. You can take this course in the following formats:
  • Training-on-Demand: Start training within 24 hours of registration, following lecture material at your own pace through streaming video and booking a time that suits your schedule to work through hands-on exercises.
  • Live Virtual Event: Attend a live event from your own desk, no travel required. Choose from a selection of events on the schedule to suit different time-zones including 3, 17 and 18 April, 16 May, and 13 and 27 June 2016.
  • In-Class Event: Travel to an education center to take a class. Below is a selection of the in-class events already on the schedule.

 Location  Date  Delivery Language
Melbourne, Australia
4 April 2016 English
Sydney, Australia
18 April 2016 English
Sao Paolo, Brazil
27 June 2016 Brazilian Portuguese
Bogota, Colombia
20 June 2016 Spanish
London, England
14 March 2016 England
Hamburg, Germany
11 April 2016 German
Milan, Italy
12 December 2016 Italian
Rome, Italy
2 May 2016 Italian
Turin, Italy
27 June 2016 Italian
Dehli, India
14 March 2016 English
Pune, India
11 April 2016 English
Seoul, Korea
19 September 2016 Korean
Kuala Lumpur, Malaysia
25 July 2016 English
Petaling Jaya, Malaysia
22 August 2016 English
Mexico City, Mexico
25 July 2016 Spanish
Utrecht, Netherlands 11 April 2016 English
Johannesburg, South Africa
27 June 2016 English
Pretoria, South Africa
5 December 2016 English
Istanbul, Turkey
9 May 2016 Turkish
Amman, United Arab Emirates
15 May 2016 English
Atlanta, GA, United States
2 May 2016 English
Cambridge, GA, United States
20 June 2016 English
Chicago, IL, United States 11 July 2016 English
Fort Lauderdale, Fl, United States 25 July 2016 English
Belmont, CA, United States 8 August 2016 English
Reston, VA, United States 31 October 2016 English

Taking the Oracle Linux 5 & 6 System Administration course is one step in your preparation to sit the Oracle Linux 5 & 6 System Administrator OCA certificate exam.

To register for an event or learn more about the Oracle Linux curriculum, go to http://oracle.com/education/linux.

Friday Feb 19, 2016

FRIDAY SPOTLIGHT: CVE-2015-7547 - Ksplice solves glibc flaw with zero-downtime and no disruptions

This week we have seen a new vulnerability making the rounds involving glibc. The issue at hand involves a couple of libraries (libresolv and libnss_dns), which are used commonly with tasks like DNS lookups. Using the function getaddrinfo() could generate a stack buffer overflow with larger replies, which in turn could be used maliciously to trigger an exploit through attacker-controlled domain names, attacker-controlled DNS servers or man-in-the-middle attacks.

The glibc upstream project released a patch for this issue and most distributions (including Oracle Linux) have released updated glibc packages containing this fix.  Since glibc is a core system library that is used by almost every application on a system, updates to the package typically require restarting applications and best practices would suggest a system reboot.  

Oracle Linux customers with premier support have the advantage of our Ksplice services, which makes it possible to install both kernel and user space updates without the need to restart applications or reboot the system.  If you would like more information about Ksplice and Oracle Linux, please visit our website.

Thursday Feb 11, 2016

Training Thursdays: What Linux Sys Admins Need to Know

There are some key skills that you need if you want to be a Linux system administrator. The Oracle Linux System Administration courses teach you these skills. The objectives of these courses are to:

  • Install Oracle Linux
  • Load and configure the Unbreakable Enterprise Kernel
  • Install software packages from Unbreakable Linux Network and other repositories
  • Use Ksplice to update the kernel on a running system
  • Configure system logging
  • Load kernel modules and configure kernel module parameters
  • Perform User and Group administration
  • Create Ext, XFS, and Btrfs file systems
  • Maintain swap space
  • Use Logical Volume Manager (LVM)
  • Configure RAID devices
  • Configure File Sharing services (NFS, FTP, OpenSSH)
  • Perform Security Administration (firewalld, iptables, chroot, TCP wrappers)
  • Prepare Oracle Linux system for Oracle database
  • Troubleshoot problems and perform corrective action

Those interested in Linux 7 should take the Oracle Linux 7: System Administration course. You can take this course as a:

  • Live-Virtual Event: Attend a live event from your own desk, no travel required. Choose from a selection of events on the schedule to suit different time-zones including 14 and 15 February, 7, 14 and 28 March, 4 and 18 April, and 9 May 2016.
  • In-Class Event: Travel to an education center to take this class. Below is a selection of the in-class events on the schedule.

 Location  Date  Delivery Language
Vienna, Austria
15 February 2016 German
Reading, England
7 March 2016 English
Paris, France
6 June 2016 French
Jakarta, Indonesia
25 April 2016 English
Utrecht, Netherlands
9 May 2016 English
Makati City, Philippines
18 April 2016 English
Moscow, Russia
15 February 2016 Russian
Cape town, South Africa
29 February 2016 English
Johannesburg, South Africa
29 February 2016 English
Pretoria, South Africa
11 July 2016 English
Bangkok, Thailand
23 May 2016 English
Dubai, United Arab Emirates
3 April 2016 English
Dallax, TX, United States 25 April 2016 English
Those interested in Linux 5 or 6 should take the Oracle Linux 5 & 6 System Administration course. You can take this course as a:
  • Training-on-Demand: Start training within 24 hours of registering, following lecture delivery at your own pace through streaming video and booking a time that suits you to perform lab exercises.
  • Live-Virtual Event: Attend a live event from your own desk, no travel required. Choose from a selection of events on the schedule to suit different time-zones including 7 March, 4 and 18 April, and 18 May 2016.
  • In-Class Event: Travel to an education center to take this class. Below is a selection of the in-class events on the schedule.

 Location  Date  Delivery Language
Melbourne, Australia
4 April 2016 English
Sydney, Australia
18 April 2016 English
London, England
14 March 2016 English
Hamburg, Germany
11 April 2016 German
Athens, Greece
15 February 2016 Greek
Milan, Italy
12 December 2016 Italian
Rome, Italy
2 May 2016 Italian
Turin, Italy
27 June 2016 Italian
Amman, Jordan
15 May 2016 English
Utrecht, Netherlands  11 April 2016 English
Johannesburg, South Africa
27 June 2016 English
Istanbul, Turkey 9 May 2016 Turkish
Dubai, United Arab Emirates 21 February 2016 English
Atlanta, GA, United States 2 May 2016 English
Reston, VA, United States 15 February 2016 English
The Oracle Linux 5 & 6 System Administration course is one step in your preparation to sit the Oracle Linux 5 & 6 System Administrator Oracle Certified Associate exam.

To register for an event or to learn more about the Oracle Linux curriculum, go to http://oracle.com/education/linux.

Friday Jan 22, 2016

FRIDAY SPOTLIGHT: Announcing User Space Support for Ksplice on Oracle Linux 6

During Oracle OpenWorld 2015 Oracle released new features for Oracle Ksplice which introduced groundbreaking capabilities to patch user space libraries in Oracle Linux 7 without rebooting. This new feature, plus the extensive zero-downtime kernel patching capabilities already included in Oracle Ksplice, make it an ideal choice for keeping your Oracle Linux infrastructure up to date and secure.

Today, Oracle is pleased to announce user space patching with Oracle Ksplice is now available for Oracle Linux Premier Support customers using Oracle Linux 6. Now you can take advantage of this cutting edge technology to keep key user space libraries up to date on Oracle Linux 6 or Oracle Linux 7. And, of course, Oracle Ksplice continues to provide critical kernel patches so you can patch both kernel and user space without ever needing to reboot.

Read about the user space patching capabilities of Oracle Ksplice in the updated documentation, and get the latest Oracle Ksplice packages with your Oracle Linux Premier Support agreement from the Unbreakable Linux Network.

Friday Jan 08, 2016

Announcing the general availability of Unbreakable Enterprise Kernel Release 4

The Oracle Linux team is pleased to announce the general availability of the Unbreakable Enterprise Kernel (UEK) Release 4 for Oracle Linux 6 and Oracle Linux 7.  This release, based on the 4.1 mainline kernel, delivers many important new features and enhancements engineered for modern cloud infrastructure.  

  • Significant performance improvements through enhancements to features like automatic NUMA balancing and CPU schedulers, and the introduction of new features like zswap, zram, the LZ4 compression algorithm, network batch transmissions and low-latency network polling.
  • More options for boosting the security of systems and the applications they host. UEK Release 4 now includes kernel address space randomization, a new random number system call and updates in key areas like SELinux, nftables, SHA256 and SHA512.
  • Real-time kernel and userspace patching with Ksplice for Oracle Linux to simplify managing cloud infrastructure and improve security.
  • Support for key cloud technologies. Xen host and guest domain feature and performance enhancements, Open vSwitch and VXLAN improvements for networking, cgroups and namespace enhancements for linux containers and Docker.
  • Enhancements to Oracle Linux DTrace for dynamic, real-time system tracing on production systems
  • The production release and support of Ceph Storage for Oracle Linux Release 1.0, based on the upstream Firefly release
  • New real-time kernel features including timerless (tickless) multitasking and the addition of the deadline scheduling class
  • Enhanced infiniband features including improved protocols, drivers and firmware.
  • A number of updates to key areas such as XFS, Btrfs, Ext4, NFS, FUSE and the Overlay file systems.
  • A number of driver updates supporting the latest hardware.

This has been a major engineering effort that can benefit every Oracle Linux customer. For more information on this release, please review the release notes here.

Oracle Linux is available to download from the Oracle Software Delivery Cloud and the Oracle Yum repos.

Friday Dec 18, 2015

FRIDAY SPOTLIGHT: Oracle Linux Newsletter December 2015 Issue Out

The latest issue of the Oracle Linux Newsletter - December 2015 issue is out. It comes with great new videos, demos, whitepapers and partner news. 

Read it today and subscribe to get it sent to your email bi-monthly.


Monday Nov 02, 2015

New Userspace Patching with Oracle Ksplice!

Last week, Larry Ellison introduced userspace patching with Oracle Ksplice. This is a groundbreaking addition to the already extensive capabilities of Ksplice, giving administrators the tools they need to cope with security threats and other issues without impacting running systems.

If you're unfamiliar with Ksplice, it provides zero-downtime patching (also known as “live patching") for Linux. With Ksplice, updates and errata (CVEs, etc.) can be applied to running systems without restarting applications or rebooting. This is a boon for organizations since scheduling downtime across a server farm is a significant event, and many companies using a variety of operating systems only perform patches periodically in a regular cycle. But being able to apply critical updates immediately–or remove them, if necessary–without impacting servers even under heavy load allows administrators to reduce the window of vulnerability for security issues to the bare minimum, making systems more secure. A fantastic primer on Ksplice can be found in Wim Coekaerts' blog post The Magic of Ksplice.

While Ksplice has been a great tool for applying patches without downtime, it has been focused exclusively on kernel patches. That is, until last week with the announcement of userspace patching for Ksplice.

Why is userspace patching important? Well, patching the kernel as Ksplice has done for years solves a number of issues. It lets you patch security vulnerabilities at the kernel level, it allows you to apply patches to do diagnostics, and so on. But applications rely on services available above the kernel (in “userspace”) to do many of their tasks. For example, glibc, the GNU C Library, is the standard C and C++ library used by applications on Linux. And OpenSSL provides secure networking services for applications so applications don’t have to implement these features from scratch. But patching the kernel doesn’t help with changes that need to be made in these system wide libraries.

These standard libraries are very useful because they allow the community to optimize and standardize on how common tasks are accomplished. But since they are used by so many applications, a flaw in one of these libraries creates widespread exposure. Just such an exposure happened with the Heartbleed Bug, where an issue with OpenSSL left thousands of servers at risk.

With userspace patching in Ksplice, Oracle can now provide you with the tools to patch these userspace libraries without downtime. At Oracle OpenWorld last week, we were showing attendees in the Oracle Linux, Oracle VM, and OpenStack Showcase how we can apply userspace patches for the Ghost and Heartbleed vulnerabilities, check that the systems were indeed secured, and then roll those patches back to their unsecured state, all in a couple of minutes and without stopping running applications. This is the power of the new userspace feature of Ksplice. In this first release of userspace patching, the focus is on glibc and OpenSSL since this will cover many of the security related issues customers will run into. 

With the addition of userspace patching, a great tool just got even better. Ksplice can now patch the running Linux kernel and also patch userspace glibc and OpenSSL without downtime. Userspace patching is a huge development in zero-downtime patching, and another tool in the toolbox for administrators needing to cope with critical updates. This brings the magic of Ksplice from the kernel up to userspace, making your systems safer.

Userspace patching for Ksplice is available now in the enhanced Ksplice client for customers with Oracle Linux Premier Support. You can read about it in the latest Ksplice documentation and when you’re ready to try it out, you can enable it on the Unbreakable Linux Network and install it on your systems.

Thursday Jul 30, 2015

Announcing the general availability of Unbreakable Enterprise Kernel Release 3 Quarterly Update 6

We are pleased to announce the availability of Unbreakable Enterprise Kernel Release 3 Quarterly Update 6 (UEKR3U6) for Oracle Linux 6 and Oracle Linux 7. This is the sixth quarterly update release for UEK Release 3 (Version 3.8.13-98) and includes driver updates and a consolidation of fixes for bugs and security issues.

Some notable highlights include:

  • Driver for Intel Sandy Bridge memory controllers (sb_edac) version 1.0.0 included
  • New hardware support for SGI UltraViolet 3 platform
  • LXC Improvements in kernel and userspace including a new --privilege option when creating containers
  • Xen improvements such as preventing soft lockups due to long-running hypercalls and preventing memory leaks in the Xen block driver
  • DTrace improvements for using User-Level Statically Defined (USDT) probes in 32-bit applications on 64-bit hosts
  • Support for more than eight PTP hardware clocks (PHC)
  • Device driver updates (e.g. storage devices, network cards) from key partners, such as:
    • Adaptec
    • Broadcom
    • Cisco
    • Emulex
    • Intel
    • QLogic
    • VMware

For more information about this release, please refer to the release notes

The source code is available on our public git repository

Wednesday Jul 29, 2015

Announcing the general availability of Oracle Linux 6.7

We're happy to announce the general availability of Oracle Linux 6 Update 7, the seventh update release for Oracle Linux 6. You can find the individual RPM packages on the Unbreakable Linux Network (ULN) and our public yum repository and ISO installation images are available for download from the Oracle Software Delivery Cloud.

Oracle Linux 6 Update 7 ships with the following kernel packages:

  • Unbreakable Enterprise Kernel (UEK) Release 3 (kernel-uek-3.8.13-68.3.4.el6uek) for x86-64
  • Unbreakable Enterprise Kernel (UEK) Release 2 (kernel-uek-2.6.39-400.250.7.el6uek) for i386 
  • Red Hat Compatible Kernel (kernel-2.6.32-573.el6) for i386 and x86-64
By default, both the Unbreakable Enterprise Kernel and the Red Hat Compatible Kernel for the specific architecture (i386 or x86-64) are installed and the system boots the Unbreakable Enterprise Kernel.

Notable features in this release include:

  • Open Security Content Automation Protocol (OpenSCAP), including the oscap utility for enhanced security auditing and compliance
  • Load Balancing and High Availability with Keepalived and HAProxy, supported under Oracle Linux Premier Support subscriptions
  • Enhanced SSSD support for Active Directory, including:
    • Dynamic updates to DNS
    • Group and user lookups of NetBIOS names
    • site discovery of domain controllers
    • User and group resolution, including user authentication for trusted domains within a single AD forest
  • Updates to the hyper-daemons package , which contains hypervfcopydhypervkvpd, and hypervvssd

For more details on these and other new features and changes in Oracle Linux 6 Update 7, please consult the release notes in the Oracle Linux Product Documentation Library.

Oracle Linux can be downloaded, used and distributed free of charge and all updates and errata are freely available. For support, you decide which of your systems require a support subscription.  This makes Oracle Linux an ideal choice for your development, testing and production systems.  You decide which support coverage is the best for each of your systems individually, while keeping all of your systems up-to-date and secure.  For customers with Oracle Linux Premier Support, you also receive access to zero-downtime kernel updates using Oracle Ksplice and support for Oracle OpenStack for Oracle Linux.

 For more information about Oracle Linux, please visit www.oracle.com/linux

Friday Jun 26, 2015

Friday Spotlight: A busy week, and Spacewalk and Ksplice

Happy Friday!

With Oracle OpenWorld Latin America with several Oracle Linux and virtualization sessions and demos, and our booth at Red Hat Summit, it’s been a busy and fun week here at Oracle.

For today's spotlight, I’m going to reach back into the archives to highlight something that I think is particularly cool. You probably know about Spacewalk for managing your Linux deployments, and you also probably know about our Ksplice feature that allows for zero-downtime kernel updates. Taken together, these tools give you a streamlined way to keep your Oracle Linux systems up to date. And, in fact, this past winter we did a webcast on this exact subject, which is available as an archive. It would be nice background listening as you wrap-up your Friday afternoon:

Spacewalk and Ksplice: Keeping Oracle Linux Systems Up to Date and Secure (webcast archive)

See you next week!

-Chris


Friday Apr 17, 2015

Friday Spotlight: The Power of The Ksplice Feature of Oracle Linux Video

Happy Friday!

I'm really excited to share this week's Friday Spotlight with you. Oracle Senior Vice President of Linux and Virtualization Wim Coekaerts sat down with Director of Product Management Michele Casey and Senior Development Manager Jamie Iles to talk about Ksplice.

In the video, they go into a lot of detail about why Ksplice is a production-ready tool for keeping systems up to date. A highlight for me is the discussion featuring a real world example of an Oracle Linux 6.2 system from 2011, and how a system like that can be patched over time with all the important CVEs and security updates without a single reboot -- no rebooting literally for years. For production systems, you can just keep the system up and running, and still be up to date. Click this screenshot to head on over to Oracle Media Network to watch the video:

We'll see you next week!

-Chris 

Thursday Mar 19, 2015

Unbreakable Enterprise Kernel Release 3 Quarterly Update 5 Now Available

We are pleased to announce the availability of Unbreakable Enterprise Kernel Release 3 Quarterly Update 5 (UEKR3U5) for Oracle Linux 6 and Oracle Linux 7. This is the fifth quarterly update release for UEK Release 3 (Version 3.8.13-68) and includes driver updates and a consolidation of fixes for bugs and security issues.

Some notable highlights include:

  • The turbostat tool is now included with the kernel and can be used to provide information on processor topology and statistics, such as temperature and frequency.
  • Updates to the bonding driver to enable the ethtool command, which shows useful data like link aggregate speed and duplex mode.
  • The SHA-512 hash algorithm is now available for signing kernel modules during installation.
  • The ability to use swap files that reside on NFS shares is available as a technology preview.
  • Xen EFI support has been added.
  • Device driver updates (e.g. storage devices, network cards) from key partners, such as:
    • Broadcom
    • Cisco
    • Emulex
    • HP
    • Intel
    • Mellanox
    • Microsoft

For more details, please review the release notes.

The source code is available on our public git repository

Thursday Mar 12, 2015

Announcing General Availability of Oracle Linux 7.1

We're happy to announce the general availability of Oracle Linux 7 Update 1, the first update release for Oracle Linux 7. All packages are currently available on ULN and public yum; ISO installation images will be freely available for download from the Oracle Software Delivery Cloud soon.

Oracle Linux 7 Update 1 ships with the following kernel packages:

  •     Unbreakable Enterprise Kernel (UEK) Release 3 (kernel-uek-3.8.13-55.1.6.el7uek) for x86-64
  •     Red Hat Compatible Kernel (kernel-3.10.0-229.el7) for x86-64

Oracle Linux 7 update 1 provides the latest features and innovations, such as:

  • Linux container support using either Docker or LXC with UEK Release 3
  • Comprehensive dynamic tracing with DTrace and UEK Release 3
  • Production support for Btrfs with UEK Release 3
  • The latest 3rd party hardware support

For more details on these and other new features and changes in Oracle Linux 7 Update 1, please consult the release notes in the Oracle Linux Product Documentation Library.

Oracle Linux can be downloaded, used and distributed free of charge and all updates and errata are freely available. For support, you decide which of your systems require a support subscription.  This makes Oracle Linux an ideal choice for your development, testing and production systems.  

For customers with Oracle Linux Premier Support, you also receive support for Oracle OpenStack for Oracle Linux and access to zero-downtime kernel updates with Oracle Ksplice, at no additional charge. Oracle Ksplice is fully supported and has been providing live kernel updates to production systems since 2009, delivering more than 1 million patches to mission critical systems without a single reboot.  For more information, please visit ksplice.oracle.com.

 For more information about Oracle Linux, please visit www.oracle.com/linux .

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