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Friday, 24 Feb 17 - Tux Machines is a community-driven public service/news site which has been around for over a decade and primarily focuses on GNU/LinuxSubscribe now Syndicate content

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ext4, application expectations and power management

Filed under
Software

advogato.org/mjg59: There's been a certain amount of discussion about behavioural differences between ext3 and ext4[1], most notably due to ext4's increased window of opportunity for files to end up empty due to both a longer commit window and delayed allocation of blocks in order to obtain a more pleasing on-disk layout.

fwbuilder: Manage Firewalls Professionally

Filed under
Software

debaday.debian.net: Everyone knows about netfilter/iptables. Unfortunately, managing a security policy with it remains a non-trivial task for several reasons. What is needed is a tool that lets an administrator define the security policy on a higher level of abstraction and hide the internal structure of the target firewall platform.

Why is Ubuntu the most popular distro?

Filed under
Ubuntu

manishtech.wordpress: I just came across a discussion on Reddit why Ubuntu is the most popular distro? Everyone who comes to know about Linux first hears about Ubuntu. Why is it so?

some odds & ends:

Filed under
News
  • NVIDIA Pushes Out New Driver With No Change-Log

  • SLED 11 RC 4 first glance
  • Create ODF documents without OpenOffice.org
  • Microsoft's Silverlight Gaffe
  • Wormux 0.8.3 released
  • Reason why people who work with computers have so much free time
  • Saving date and time to hardware clock manually
  • Interesting New Features in Ubuntu 9.04 Jaunty
  • Ubuntu Linux on Dell laptops
  • Install Chromium Browser on Arch Linux
  • We're Linux Video Contest Sad
  • Linux.com to Bring “Social Web” To Linux Geeks?
  • Vnc Configuration in Debian Etch/Lenny
  • Small tip - How to update / upgrade ArchLinux
  • FLOSS Weekly 60: BOINC
  • Converting avi files to dpg in Linux
  • Chromium on Ubuntu ! [HOW TO]

The Ill-Fated PCLinuxOS 2009.1 Experiment

Filed under
PCLOS

reddevil62-techhead.blogspot: PCLinuxOS 2009.1 was running beautifully. The installation from the live CD had retained the settings and I had completed all my usual post-install multimedia checks. So why, by all that's holy, did I think that switching on Compiz's 3D effects might be A Good Thing To Try?

Celebrating Linux's 15th birthday

Filed under
Linux

anarchangel.blogspot: The wife and I are celebrating the anniversary of Linux, by watching "RevolutionOS", streaming from Netflix to our TiVo.

Take the Linux Filesystem Tour

Filed under
Linux

tuxradar.com: Well, hello! Welcome to the Linux Filesystem Tour. My name is Manuel Page, and I will be your guide today. I and my bus driver, Hal D., are very pleased to have you on board.

PCLinuxOS: Radically simple and a bit boring for geeks

Filed under
PCLOS

osgeex.blogspot: Today I gave the new PCLinuxOS 2009.1 a spin and planned to write a review. The "Problem" with PCLinuxOS is: it actually is radically simple.

I love openSUSE

Filed under
SUSE

gogoboygo.com/blog: I’m a convert from Ubuntu, after several years with that distribution of Linux, and the difference between Ubuntu 8.10 and OpenSuse 11.1 is night and day.

Debian: Absence of a General Purpose installable CD or DVD Media

Filed under
Linux

pclinuxos2007.blogspot: Debian is the best, most stable, and the biggest community distro! No doubt about it. I liked its latest, Lenny very much. But all the way from downloading it and installing was not a joyride.

HackMy...phase II

For those of you who don't know, Hackmy... forums started out as a "advanced" forum for users of PCLinuxOS.

HackMy has moved to a new host and has a whole new look and goal though. Hackmy is now open to users of Linux, ANY distro.

First Look: PCLinuxOS 2009.1 GNOME

Filed under
PCLOS

news.softpedia.com: I used to be one of PCLinuxOS' fans and I especially enjoyed the GNOME flavor so hearing that the team was ready to finally launch a new version sparkled a lot of interest in me.

OzOS Linux - The Wizard or the Tinman?

Filed under
Linux

dedoimedo.com: I like exotic distributions. The promise of the beautiful E17 windows manager on top of the lightweight Xubuntu is what drew me to this little known distribution. Hence, this review.

15 Interesting Facts About the Linux Kernel

Filed under
Linux

junauza.com: Exactly 15 years ago, on March 1994, Linux kernel version 1.0.0 was humbly released for the world to tinker with. To celebrate the historic moment, I have collected some really interesting facts about the Linux kernel.

Intro to V4L2

Filed under
Software

linuxdevices.com: This articles describes the Linux's V4L2 (Video for Linux 2) interface, along with the first steps toward developing a device driver that uses the interface. It is based on Linux 2.6.28, and may not apply to other kernel versions.

The Advantages Of Ubuntu

Filed under
Ubuntu

seogadget.co.uk: Bob Smiley left a fantastic comment on my blog a few days back. The comment was so rich, detailed and lengthy that it justifies a blog post all on its own. So, Bob Smiley summarises the advantages of Ubuntu.

The Linux Leap of Faith

Filed under
Linux

mr-oss.com: It is easy to sit on the Linux bandwagon and shout about how running Linux could solve all your problems. It's also easy to see that this just isn't really true.

The Application Installation Situation on Linux Distros

Filed under
Linux

blog.ibeentoubuntu: Installing apps under most distributions is rather simple. When it's not simple, though, it becomes a lot more difficult. Easy is dead easy. Everything else is pretty difficult.

Use The Tools

Filed under
Linux

pthree.org: When I taught Linux system administrators, I would go through a series of rules, and rule #1 was always: Whenever you’re editing config files, and a tool exists to make the change, use the tool instead of editing the config by hand.

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More in Tux Machines

Leftovers: BSD

Security Leftovers

  • Stop using SHA1 encryption: It’s now completely unsafe, Google proves
    Security researchers have achieved the first real-world collision attack against the SHA-1 hash function, producing two different PDF files with the same SHA-1 signature. This shows that the algorithm's use for security-sensitive functions should be discontinued as soon as possible. SHA-1 (Secure Hash Algorithm 1) dates back to 1995 and has been known to be vulnerable to theoretical attacks since 2005. The U.S. National Institute of Standards and Technology has banned the use of SHA-1 by U.S. federal agencies since 2010, and digital certificate authorities have not been allowed to issue SHA-1-signed certificates since Jan. 1, 2016, although some exemptions have been made. However, despite these efforts to phase out the use of SHA-1 in some areas, the algorithm is still fairly widely used to validate credit card transactions, electronic documents, email PGP/GPG signatures, open-source software repositories, backups and software updates.
  • on pgp
    First and foremost I have to pay respect to PGP, it was an important weapon in the first cryptowar. It has helped many whistleblowers and dissidents. It is software with quite interesting history, if all the cryptograms could tell... PGP is also deeply misunderstood, it is a highly successful political tool. It was essential in getting crypto out to the people. In my view PGP is not dead, it's just old and misunderstood and needs to be retired in honor. However the world has changed from the internet happy times of the '90s, from a passive adversary to many active ones - with cheap commercially available malware as turn-key-solutions, intrusive apps, malware, NSLs, gag orders, etc.
  • Cloudflare’s Cloudbleed is the worst privacy leak in recent Internet history
    Cloudflare revealed today that, for months, all of its protected websites were potentially leaking private information across the Internet. Specifically, Cloudflare’s reverse proxies were dumping uninitialized memory; that is to say, bleeding private data. The issue, termed Cloudbleed by some (but not its discoverer Tavis Ormandy of Google Project Zero), is the greatest privacy leak of 2017 and the year has just started. For months, since 2016-09-22 by their own admission, CloudFlare has been leaking private information through Cloudbleed. Basically, random data from random sites (again, it’s worth mentioning that every site that used CloudFlare in the last half year should be considered to having fallen victim to this) would be randomly distributed across the open Internet, and then indefinitely cached along the way.
  • Serious Cloudflare bug exposed a potpourri of secret customer data
    Cloudflare, a service that helps optimize the security and performance of more than 5.5 million websites, warned customers today that a recently fixed software bug exposed a range of sensitive information that could have included passwords and cookies and tokens used to authenticate users. A combination of factors made the bug particularly severe. First, the leakage may have been active since September 22, nearly five months before it was discovered, although the greatest period of impact was from February 13 and February 18. Second, some of the highly sensitive data that was leaked was cached by Google and other search engines. The result was that for the entire time the bug was active, hackers had the ability to access the data in real-time by making Web requests to affected websites and to access some of the leaked data later by crafting queries on search engines. "The bug was serious because the leaked memory could contain private information and because it had been cached by search engines," Cloudflare CTO John Graham-Cumming wrote in a blog post published Thursday. "We are disclosing this problem now as we are satisfied that search engine caches have now been cleared of sensitive information. We have also not discovered any evidence of malicious exploits of the bug or other reports of its existence."

Security Leftovers

  • Change all the passwords (again)
    Looks like it is time to change all the passwords again. There’s a tiny little flaw in a CDN used … everywhere, it seems.
  • Today's leading causes of DDoS attacks [Ed: The so-called 'Internet of things' (crappy devices with identical passwords) is a mess; programmers to blame, not Linux]
    Of the most recent mega 100Gbps attacks in the last quarter, most of them were directly attributed to the Mirai botnet. The Mirai botnet works by exploiting the weak security on many Internet of Things (IoT) devices. The program finds its victims by constantly scanning the internet for IoT devices, which use factory default or hard-coded usernames and passwords.
  • How to Set Up An SSL Certificate on Your Website [via "Steps To Secure Your Website With An SSL Certificate"]
  • SHA-1 is dead, long live SHA-1!
    Unless you’ve been living under a rock, you heard that some researchers managed to create a SHA-1 collision. The short story as to why this matters is the whole purpose of a hashing algorithm is to make it impossible to generate collisions on purpose. Unfortunately though impossible things are usually also impossible so in reality we just make sure it’s really really hard to generate a collision. Thanks to Moore’s Law, hard things don’t stay hard forever. This is why MD5 had to go live on a farm out in the country, and we’re not allowed to see it anymore … because it’s having too much fun. SHA-1 will get to join it soon.
  • SHA1 collision via ASCII art
    Happy SHA1 collision day everybody! If you extract the differences between the good.pdf and bad.pdf attached to the paper, you'll find it all comes down to a small ~128 byte chunk of random-looking binary data that varies between the files.
  • PayThink Knowledge is power in fighting new Android attack bot
    Android users and apps have become a major part of payments and financial services, carrying an increased risk for web crime. It is estimated that there are 107.7 million Android Smartphone users in the U.S. who have downloaded more than 65 million apps from the Google App Store, and each one of them represents a smorgasbord of opportunity for hackers to steal user credentials and other information.
  • Red Hat: 'use after free' vulnerability found in Linux kernel's DCCP protocol IPV6 implementation
    Red Hat Product Security has published details of an "important" security vulnerability in the Linux kernel. The IPv6 implementation of the DCCP protocol means that it is possible for a local, unprivileged user to alter kernel memory and escalate their privileges. Known as the "use-after-free" flaw, CVE-2017-6074 affects a number of Red Hat products including Red Hat Enterprise Linux 6, Red Hat Enterprise Linux 7 and Red Hat Openshift Online v2. Mitigating factors include the requirement for a potential attacker to have access to a local account on a machine, and for IPV6 to be enabled, but it is still something that will be of concern to Linux users. Describing the vulnerability, Red Hat says: "This flaw allows an attacker with an account on the local system to potentially elevate privileges. This class of flaw is commonly referred to as UAF (Use After Free.) Flaws of this nature are generally exploited by exercising a code path that accesses memory via a pointer that no longer references an in use allocation due to an earlier free() operation. In this specific issue, the flaw exists in the DCCP networking code and can be reached by a malicious actor with sufficient access to initiate a DCCP network connection on any local interface. Successful exploitation may result in crashing of the host kernel, potential execution of code in the context of the host kernel or other escalation of privilege by modifying kernel memory structures."

Android Leftovers