- wlug - list.wlug.org.nz

Alternatives To The OOM Killer
by Lawrence D'Oliveiro 29 Apr '20

29 Apr '20

By default, if a process asks for more (virtual) memory, the Linux kernel never says no. (It can be easily configured to do so, if you want.) Therefore, it is possible for a process to try to access more memory than the system has available. This situation triggers the dreaded “OOM Killer” <https://lwn.net/Articles/317814/>, which hunts around for resource-hogging processes and kills them according to a priority scheme that nobody quite understands. To avoid things getting this bad, various people have come up with alternatives in the form of userspace daemons that monitor system resource usage, and implement their own (configurable) rules for killing processes before things get dire enough to wake up the OOM Killer. The announcement of Fedora 32 mentions <https://www.theregister.co.uk/2020/04/28/red_hat_summit/> the inclusion of one of these solutions, “EarlyOOM”. Looking at the project’s <https://github.com/rfjakob/earlyoom> readme page shows mention of two others: “nohang” (written in Python) and “oomd” (from Facebook). I see all three available as standard Debian packages, at least as of Debian Unstable.

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One Space Or Two?
by Lawrence D'Oliveiro 29 Apr '20

29 Apr '20

>From the “Yet Another Subject For A Holy War” Department, Microsoft is planning for the next update to Word to flag two spaces after a full stop and before the next sentence as a typo <https://www.theregister.co.uk/2020/04/27/microsoft_roundup/>. Two spaces after a full stop was long-standing practice for typewritten text, and carried over to some extent to computer users. But with the advent of WYSIWYG word processing and proportional fonts, it became more common to adopt the practice of typeset text, and only put one space after a full stop, before the next sentence. Where do you stand? Microsoft ran a poll on the question, and it seems the majority favoured a single space.

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Lenovo is joining Dell in the “OEM Linux Laptop” club
by Peter Reutemann 28 Apr '20

28 Apr '20

'It looks like Lenovo may upstage Dell as the big name in OEM Linux laptops—not counting specialty retailers like System76, of course. Red Hat and Lenovo are announcing pre-installed and factory-supported Fedora Workstation on several models of ThinkPad laptops at Red Hat Summit this week. Dell's Linux support has generally been limited to one or two very specific laptops—first, the old Atom-powered netbooks and, more recently, the XPS 13 Developer Edition line. Lenovo is planning a significantly broader Linux footprint in its lineup. Fedora Workstation will be a selectable option during purchase for the Thinkpad P1 Gen2, Thinkpad P53, and Thinkpad X1 Gen8 laptops—and Lenovo may offer even broader model support in the future. Lenovo Senior Linux Developer Mark Pearson, who will be the featured guest in the May 2020 Fedora Council Video Meeting, expresses the company's stance on forthcoming integration: "Lenovo is excited to become a part of the Fedora community. We want to ensure an optimal Linux experience on our products. We are committed to working with and learning from the open source community."' -- source: https://arstechnica.com/gadgets/2020/04/lenovo-is-joining-dell-in-the-oem-l… Cheers, Peter -- Peter Reutemann Dept. of Computer Science University of Waikato, NZ +64 (7) 858-5174 http://www.cms.waikato.ac.nz/~fracpete/ http://www.data-mining.co.nz/

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Hackers Are Exploiting a Sophos Firewall Zero-day
by Peter Reutemann 28 Apr '20

28 Apr '20

'Cyber-security firm Sophos has published an emergency security update to patch a zero-day vulnerability in its XG enterprise firewall product that was being abused in the wild by hackers. From a report: Sophos said it first learned of the zero-day on late Wednesday, April 22, after it received a report from one of its customers. The customer reported seeing "a suspicious field value visible in the management interface." After investigating the report, Sophos determined this was an active attack and not an error in its product. "The attack used a previously unknown SQL injection vulnerability to gain access to exposed XG devices," Sophos said in a security advisory today. Hackers targeted Sophos XG Firewall devices that had their administration (HTTPS service) or the User Portal control panel exposed on the internet. Sophos said the hackers used the SQL injection vulnerability to download a payload on the device. This payload then stole files from the XG Firewall.' -- source: https://tech.slashdot.org/story/20/04/27/162211 Cheers, Peter -- Peter Reutemann Dept. of Computer Science University of Waikato, NZ +64 (7) 858-5174 http://www.cms.waikato.ac.nz/~fracpete/ http://www.data-mining.co.nz/

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New CPU Performance Testing Concludes AMD Beats Intel
by Peter Reutemann 27 Apr '20

27 Apr '20

'If you're looking for the best gaming CPU or the best CPU for desktop applications, there are only two choices to pick from: AMD and Intel. That fact has spawned an almost religious following for both camps, and the resulting flamewars, that make it tricky to get unbiased advice about the best choice for your next processor. But in many cases, the answer is actually very clear. In fact, for most users, it's a blowout win in AMD's favor. That's an amazing reversal of fortunes for the chipmaker after it teetered on the edge of bankruptcy a mere three years ago, making its turnaround all the more impressive as it continues to upset the entrenched Intel that enjoyed a decade of dominance... Pricing is the most important consideration for almost everyone, and AMD is hard to beat in the value department. The company offers a plethora of advantages, like bundled coolers and full overclockability on all models, not to mention complimentary software that includes the innovative Precision Boost Overdrive auto-overclocking feature. You also benefit from the broad compatibility of Socket AM4 motherboards that support both forward and backward compatibility, ensuring that not only do you get the most bang for your processor buck, but also your motherboard investment. AMD also allows overclocking on all but its A-Series motherboards (see our article on how to overclock AMD Ryzen), which is another boon for users. And, in this battle of AMD vs Intel CPUs, we haven't even discussed the actual silicon yet. AMD's modern processors tend to offer either more cores or threads and faster PCIe 4.0 connectivity at every single price point. "We're not covering laptop or server chips," the article notes, adding "There's a clear winner overall, but which brand of CPU you should buy depends most on what kind of features, price and performance are important to you." Still, it's noteworthy that AMD beats Intel in 7 out of 10 comparisons. The three in which Intel won were gaming performance ("only because we measure strictly by the absolute top performance possible"), drivers and software ("the company has an army of software developers [and] a decade of dominance also finds most software developers optimizing almost exclusively for Intel architectures"), and overclocking, where Intel "has far more headroom and much higher attainable frequencies. "Just be prepared to pay for the privilege."' -- source: https://slashdot.org/story/20/04/26/1622236 Cheers, Peter -- Peter Reutemann Dept. of Computer Science University of Waikato, NZ +64 (7) 858-5174 http://www.cms.waikato.ac.nz/~fracpete/ http://www.data-mining.co.nz/

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distro showdown for virtual meeting in May?
by Peter Reutemann 26 Apr '20

26 Apr '20

Hi everyone What about a distro showdown for our (virtual) WLUG meeting in May? For instance: - GhostBSD - Ubuntu 20.04 - Manjaro - Arch - Gentoo - ... People can just demo a single distro for a few minutes via BigBlueButton (you can share your screen real easy with BBB). Thoughts? Volunteers? Cheers, Peter -- Peter Reutemann Dept. of Computer Science University of Waikato, NZ +64 (7) 858-5174 http://www.cms.waikato.ac.nz/~fracpete/ http://www.data-mining.co.nz/

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Virtual meetings?
by Peter Reutemann 24 Apr '20

24 Apr '20

Hi everyone Our last meeting moved to virtual Google Hangout on short notice, which probably explained the low turnout. My question is, whether speakers and attendees would be willing to move to virtual ones, to keep our little community together and going? The last meeting was done with Google Hangouts, as it allows sharing the screen as well. Doesn't have to be Hangouts, it was simply convenient as a lot of people have gmail accounts. Open to viable alternatives. Stay safe! Cheers, Peter -- Peter Reutemann Dept. of Computer Science University of Waikato, NZ +64 (7) 858-5174 http://www.cms.waikato.ac.nz/~fracpete/ http://www.data-mining.co.nz/

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Why You Need A Bigger OS Partition
by Lawrence D'Oliveiro 24 Apr '20

24 Apr '20

root(a)theon:~ # apt-get install games-all Reading package lists... Done Building dependency tree Reading state information... Done The following additional packages will be installed: 0ad 0ad-data 0ad-data-common 7kaa 7kaa-data a7xpg a7xpg-data abe abe-data ace-of-penguins alex4 alex4-data armagetronad armagetronad-common asc asc-data asc-music atomix atomix-data bastet beep berusky berusky-data biniax2 biniax2-data blobby blobby-data bloboats blobwars blobwars-data blockattack bsdgames btanks btanks-data burgerspace bzflag-client bzflag-data caveexpress caveexpress-data cgoban chromium-bsu chromium-bsu-data cultivation darkplaces dreamchess dreamchess-data empire enigma enigma-data enigma-doc epiphany epiphany-data extremetuxracer extremetuxracer-data famfamfam-flag-png flare-engine flare-game flightgear flightgear-data-ai flightgear-data-all flightgear-data-base flightgear-data-models flightgear-phi ... ufoai-sound ufoai-textures unknown-horizons warmux warmux-data warzone2100 warzone2100-data warzone2100-music wesnoth wesnoth-1.14 wesnoth-1.14-aoi wesnoth-1.14-core wesnoth-1.14-data wesnoth-1.14-did wesnoth-1.14-dm wesnoth-1.14-dw wesnoth-1.14-ei wesnoth-1.14-httt wesnoth-1.14-l wesnoth-1.14-low wesnoth-1.14-music wesnoth-1.14-nr wesnoth-1.14-sof wesnoth-1.14-sota wesnoth-1.14-sotbe wesnoth-1.14-thot wesnoth-1.14-trow wesnoth-1.14-tsg wesnoth-1.14-ttb wesnoth-1.14-utbs widelands widelands-data xmoto xmoto-data Suggested packages: 7kaa-music bzflag-server freeciv-client-extras freeciv-sound-standard fretsonfire-game games-adventure games-arcade games-board games-c++-dev games-card games-chess games-console games-content-dev games-education games-emulator games-fps games-java-dev games-minesweeper games-mud games-perl-dev games-platform games-programming games-puzzle games-python3-dev games-racing games-rogue games-rpg games-shootemup games-simulation games-sport games-strategy games-tetris games-toys games-typing libopenal0a libsimage-dev libbullet2 libjs-jquery-flot-docs libjs-angularjs libswt-gtk-4-java minissdpd mumble minetest-mod-moreblocks minetest-mod-moreores minetest-mod-pipeworks minetest-server minetestmapper xqf openttd-opensfx pioneers-metaserver freecell-solver-bin pysolfc-cardsets python3-pil.imagetk-dbg python-pygame-doc spring-javaai teeworlds-server ufoai-server ufoai-uforadiant Recommended packages: fretsonfire The following NEW packages will be installed: ... 0 upgraded, 327 newly installed, 0 to remove and 86 not upgraded. Need to get 9,962 MB of archives. After this operation, 14.7 GB of additional disk space will be used. Do you want to continue? [Y/n] Time was when 30-40GB was sufficient for an OS partition. But not any more. This is why, when I upgraded my boot drive a few weeks ago, I allocated 100GB for the OS.

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When in Doubt: Hang Up, Look Up, and Call Back
by Peter Reutemann 24 Apr '20

24 Apr '20

'Many security-conscious people probably think they'd never fall for a phone-based phishing scam. But if your response to such a scam involves anything other than hanging up and calling back the entity that claims to be calling, you may be in for a rude awakening. Brian Krebs: Here's how one security and tech-savvy reader got taken for more than $10,000 in an elaborate, weeks-long ruse. Today's lesson in how not to get scammed comes from "Mitch," the pseudonym I picked for a reader in California who shared his harrowing tale on condition of anonymity. Mitch is a veteran of the tech industry -- having worked in security for several years at a fairly major cloud-based service -- so he's understandably embarrassed that he got taken in by this confidence scheme. On Friday, April 17, Mitch received a call from what he thought was his financial institution, warning him that fraud had been detected on his account. Mitch said the caller ID for that incoming call displayed the same phone number that was printed on the back of his debit card. But Mitch knew enough of scams to understand that fraudsters can and often do spoof phone numbers. So while still on the phone with the caller, he quickly logged into his account and saw that there were indeed multiple unauthorized transactions going back several weeks. Most were relatively small charges -- under $100 apiece -- but there were also two very recent $800 ATM withdrawals from cash machines in Florida. If the caller had been a fraudster, he reasoned at the time, they would have asked for personal information. But the nice lady on the phone didn't ask Mitch for any personal details. Instead, she calmly assured him the bank would reverse the fraudulent charges and said they'd be sending him a new debit card via express mail. After making sure the representative knew which transactions were not his, Mitch thanked the woman for notifying him, and hung up. The following day, Mitch received another call about suspected fraud on his bank account. Something about that conversation didn't seem right, and so Mitch decided to use another phone to place a call to his bank's customer service department -- while keeping the first caller on hold. "When the representative finally answered my call, I asked them to confirm that I was on the phone with them on the other line in the call they initiated toward me, and so the rep somehow checked and saw that there was another active call with Mitch," he said. "But as it turned out, that other call was the attackers also talking to my bank pretending to be me."' -- source: https://it.slashdot.org/story/20/04/23/1933254 Cheers, Peter -- Peter Reutemann Dept. of Computer Science University of Waikato, NZ +64 (7) 858-5174 http://www.cms.waikato.ac.nz/~fracpete/ http://www.data-mining.co.nz/

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NordVPN Unveils First Mainstream WireGuard Virtual Private Network
by Peter Reutemann 23 Apr '20

23 Apr '20

'One of the largest VPN companies, NordVPN, is rolling out NordLynx -- it's first mainstream WireGuard virtual private network for its Windows, Mac, Android and iOS client-software applications. ZDNet reports: NordVPN's own tests have shown NordLynx easily outperforms the other protocols, IKEv2/IPsec and OpenVPN. How much faster? According to NordVPN's 256,886 speed tests, "When a user connects to a nearby VPN server and downloads content that's served from a content delivery network (CDN) within a few thousand miles/kilometers, they can expect up to twice higher download and upload speed." While speed is what customers will notice, security experts like WireGuard for its code's simplicity. With only about 4,000 lines of code, WireGuard's code can be comprehensively reviewed by a single individual. Besides WireGuard, NordVPN adds in its double Network Address Translation (NAT) system to protect users' privacy. This enables users to establish a secure VPN connection while storing no identifiable user data on a server. You're assigned a dynamic local IP address that remains assigned only while the session is active. User authentication is done with the help of a secure external database. To switch to NordLynx, users need to update their NordVPN app to the latest version. The NordLynx protocol can be chosen manually from the Settings menu. ' -- source: https://tech.slashdot.org/story/20/04/22/2029227 Cheers, Peter -- Peter Reutemann Dept. of Computer Science University of Waikato, NZ +64 (7) 858-5174 http://www.cms.waikato.ac.nz/~fracpete/ http://www.data-mining.co.nz/

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