January 2023 - wlug - list.wlug.org.nz

List Of IPTV Resources
by Lawrence D'Oliveiro 22 Sep '24

22 Sep '24

This user <https://github.com/iptv-org> just popped up in my GitHub feed. One repo <https://github.com/iptv-org/iptv> claims to be a list of links to over 8000 streaming TV channels from nations all over the world, while the other is a list of tools*, providers and other resources. Do be aware it’s a bit of a mixed bag: yes, there are legitimate channels (no encryption so far that I have noticed), but also some dubious-looking links. *Oddly, FFmpeg and youtube-dl aren’t in the list.

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Enabling Case-Insensitive Filenames On Linux
by Lawrence D'Oliveiro 06 Feb '24

06 Feb '24

The ext4 filesystem has had the “casefold” option for a while now <https://lwn.net/Articles/784041/>. This allows you to specify, when you initialize a new filesystem, that you want file/directory names to be treated as case-insensitive. At the same time, you have to specify that the filenames are to be interpreted as UTF-8 encoding; normally the kernel doesn’t care, it only singles out ASCII slash and NUL bytes for special interpretation, and simply passes through any other byte values in the names. I was able to create such a filesystem, but I wasn’t able to mount it in my last-upgraded-just-a-few-days-ago Debian Unstable setup. When I try, it fails, and in the dmesg log I see Filesystem with casefold feature cannot be mounted without CONFIG_UNICODE Turns out the Debian 5.10 kernel has not been built with this CONFIG_UNICODE option enabled. However, this situation looks set to change shortly, according to <https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=985689>.

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Weta Digital’s Technology Division Sold To US Firm
by Lawrence D'Oliveiro 30 Nov '23

30 Nov '23

Let me see if I understand this article <https://www.nzherald.co.nz/business/sir-peter-jackson-to-sell-weta-digital-…> correctly: the part of Weta Digital that used to develop the in-house 3D graphics/effects tools that they use in all those movies is being sold to US-based Unity Software. The part that is left will be called “WetaFX”, and will become a customer of Unity for the use of those tools, no longer doing its own development in-house. By the way, I’ve been looking at the Unity site <https://unity.com/>, and it looks like all their products are rentware (subscription-based).

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Microsoft’s File-Tainting System ’Tain’t Working
by Lawrence D'Oliveiro 15 Mar '23

15 Mar '23

Microsoft has a clever-sounding system for trying to protect Windows users from downloading malicious files: it’s called “Mark-Of-The-Web”. What it means is that any file downloaded from an untrusted source is supposed to have a special flag set in its NTFS metadata indicating that the file is not to be trusted. So any attempt by the user to perform sensitive operations on that file (e.g. execute macros from it, run it as an executable) is supposed to trigger appropriate system warnings. If the file is a .zip archive, then this mark is supposed to be propagated to all files extracted from that archive. However, it turns out this mechanism can be bypassed (surprise, surprise) <https://www.theregister.com/2022/11/01/microsoft_motw_malware_flaw/>. How can this happen? The flaw lies in the mechanism used to tell Windows to trust downloaded files, by attaching an “Authenticode” signature to them. Files without such signatures are of course untrusted and will trigger the appropriate warnings. However, by attaching an invalid signature of a particular form, you can trigger an error response from the signature-checking process that is actually interpreted as “this file is OK” <https://blog.0patch.com/2022/10/free-micropatches-for-bypassing-motw.html>. What do you call it when an attempt to add mechanisms to make a system more secure actually increases the attack surface on that system? By the way, the referenced Twitter thread discussing this vulnerability <https://twitter.com/GossiTheDog/status/1579895038523609088> seems to be saying that no Mark-Of-The-Web propagation is done for files extracted from .iso disc images. And that Microsoft uses this form for distributing its own software (Visio was mentioned) precisely to avoid the hassle of going through vetting by third-party antimalware tools.

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Emacs: Comparing Two Regions From Two Files
by Lawrence D'Oliveiro 28 Feb '23

28 Feb '23

So I was compiling some useful database-related routines that I have used in various places (with MySQL and SQLite so far) over the years into a set of common modules, so that I could easily find the latest and best-tested versions of them for future projects. Then I came to a routine with two versions of a few dozen lines each, and I was trying to figure out a way of doing a diff on them without writing them out to temporary files. I have an Emacs command called “make-command-buffer”, which I can use for example to create a buffer for entering and executing shell commands, and collecting their output. It was easy enough to copy and paste both routines into the buffer, but now how do I put them both into one diff command? There is a shell feature called “here-docs”, which lets you include the standard-input data for a command directly following the command: «cmd» <<«marker» ... data ... «marker» where the «marker» is some word that does not occur in the data. But I want to have two of these, like this: diff -u <<EOD1 <<EOD2 ... version 1 ... EOD1 ... version 2 ... EOD2 You can do something like that in Perl, but it doesn’t work in the shell. Hunting around on line reminded me why: because you can only have one standard input. But in the Bash man page, there is a syntax for redirecting arbitary file descriptors, letting you have any number of heredocs. So, combining this with the ability to give a command a file name that corresponds to an already-open file descriptor, I finally got this to work: diff -u /dev/fd/8 /dev/fd/9 8<<EOD1 9<<EOD2 ... version 1 ... EOD1 ... version 2 ... EOD2

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New Attack On AI Bots: Prompt Injection
by Lawrence D'Oliveiro 11 Feb '23

11 Feb '23

A Twitter bot account run by a company that posts remote job listings was programmed to respond to tweets directed to it with general inoffensive comments touting the positive aspects of remote work. However <https://arstechnica.com/information-technology/2022/09/twitter-pranksters-d…>, some other Twitter users discovered that if they began their tweet with directives to “ignore previous instructions”, they could get the bot to say just about anything. And much hilarity ensued. Basically, the way the bot program works is it begins with some standard instructions on what to say, provided by the people who set up the account, to which is appended whatever tweet content was sent to the bot by the other user. This is then processed by the AI system to produce a response. This attack has been dubbed “prompt injection”, by analogy with “SQL injection” and other similar attacks on non-AI systems. But whereas those attacks can be blocked using basic, well-known syntactic quoting techniques, there seem to be no easy equivalents for stopping an AI paying attention to instructions it should not be obeying.

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EU's Proposed CE Mark for Software Could Have Dire Impact on Open Source
by Peter Reutemann 31 Jan '23

31 Jan '23

'The EU's proposed Cyber Resilience Act (CRA), which aims to "bolster cybersecurity rules to ensure more secure hardware and software products," could have severe unintended consequences for open source software, according to leaders in the open source community. From a report: The proposed Act can be described as CE marking for software products and has four specific objectives. One is to require manufacturers to improve the security of products with digital elements "throughout the whole life cycle." Second is to offer a "coherent cybersecurity framework" by which to measure compliance. Third is to improve the transparency of digital security in products, and fourth is to enable customers to "use products with digital elements securely." The draft legislation includes an impact assessment that says "for software developers and hardware manufacturers, it will increase the direct compliance costs for new cybersecurity requirements, conformity assessment, documentation and reporting obligations." This extra cost is part of a total cost of compliance, including the burden on businesses and public authorities, estimated at EUR 29 billion ($31.54 billion), and consequent higher prices for consumers. However, the legislators foresee a cost reduction from security incidents estimated at EUR 180 to 290 billion annually. The question is though: how can free software developers afford the cost of compliance, when lack of funding is already a critical issue for many projects? Mike Milinkovich, director of the Eclipse Foundation, said it is "deeply concerned that the CRA could fundamentally alter the social contract which underpins the entire open source ecosystem: open source software provided for free, for any purpose, which can be modified and further distributed for free, but without warranty or liability to the authors, contributors, or open source distributors. Legally altering this arrangement through legislation can reasonably be expected to cause unintended consequences to the innovation economy in Europe."' -- source: https://news.slashdot.org/story/23/01/26/1211223 Cheers, Peter -- Peter Reutemann Dept. of Computer Science University of Waikato, Hamilton, NZ Mobile +64 22 190 2375 https://www.cs.waikato.ac.nz/~fracpete/ http://www.data-mining.co.nz/

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Customer Conned Out Of Deposit, Company Liable
by Lawrence D'Oliveiro 30 Jan '23

30 Jan '23

A malicious third party intercepted email messages between a carpeting company and a customer, and was able to send a fake email asking for a deposit to the customer with all the right contact details, but the wrong bank account number <https://www.nzherald.co.nz/lifestyle/hacker-intercepts-carpet-companys-emai…>. And now the Disputes Tribunal has ruled that, since the email looked completely convincing, with the right personal details and everything, it was not reasonable to expect the customer to be suspicious or to want to double-check. And so the company had to wear the cost of the scam.

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Intel Kills Its RISC-V Development Environment
by Lawrence D'Oliveiro 30 Jan '23

30 Jan '23

Intel is abandoning its “Pathfinder” project <https://www.theregister.com/2023/01/30/intel_ris_v_pathfinder_discontinued/> which was an integrated environment for doing development targeted at RISC-V processors. What does this mean for RISC-V? Not a lot, I would say. What does it mean for Intel? I think the basic problem here is the same as with its attempts to move into ARM: you have a high-volume, low-margin business where a company that has grown fat on not-so-high-volume, quite high-margin x86 processors was never going to be able to compete.

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Jeremy Allison Laid Off From Google
by Lawrence D'Oliveiro 28 Jan '23

28 Jan '23

Seems the latest round of layoffs from Google has hit its open-source projects particularly hard, according to Steven J Vaughan-Nichols <https://www.theregister.com/2023/01/27/google_open_source/>. The one name that immediately caught my eye was Jeremy Allison, one of the chief brains behind Samba <https://www.samba.org/>. Before joining Google, he worked at Novell. He left there in 2006 because he objected to a deal Novell made with Microsoft which was effectively a patent licence for Free software (something which the GPL doesn’t allow) <https://www.zdnet.com/article/in-case-you-missed-it-part-1-jeremy-allison-f…>. While waiting to see where else he turns up, it is worth revisiting this essay <https://www.samba.org/samba/news/articles/low_point/tale_two_stds_os2.html> from shortly before that time, where he does a comparison between the Microsoft Windows and POSIX APIs, and why there can be so many independent, yet interoperable implementations of the latter, and why there can be only one of the former (though the WINE project continues to try to change that).

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