sebcat

9 ms·

31.
by sebcat 6y ago
Apart from Linux hw support for things at work, I implemented a fairly simple pseudo-device for establishing TCP connections from a process in capability mode on FreeBSD. The device driver has support for a denylist to disallow connections
32.
by sebcat 6y ago
Quip worth thinking about[1] from the twitter thread[2]: > it's incredible to me that a $5 digital ocean box can serve traffic for 200k unique visitors and yet there's startups out there who deploy their landing pages with kube
33.
by sebcat 6y ago
> making it hard to do the wrong thing" is more or less my entire design ethos when it comes to software, particularly developer tools. See also poka-yoke: https://en.m.wikipedia.org/wiki/Poka-yoke
34.
by sebcat 7y ago
The exposure time and the dynamic range of the sensor affects the visibility of the person in that video - it is very likely that a non-distracted human would have performed better. The vehicle was equipped with both radar and lidar. The vi
35.
by sebcat 7y ago
My SO and I recently bought a house with a garden and some trees (pine, spruce, poplar, beech, one apple tree), at the outskirts of a village, close to the woods. Working on the house has so far given me a lot of satisfaction (also some str
36.
by sebcat 7y ago
AVR32 with JEM does this to some extent for Java. http://ww1.microchip.com/downloads/en/devicedoc/doc32000.pdf 3. Java Extension Module The AVR32 architecture can optionally support execution of Java
37.
by sebcat 7y ago
Had this happen in production in a third party library we used many moons ago. Sysop came and asked us why we did six figure DNS lookups over a short period of time (24h? Less? Don't remember). Would probably have gone unoticed at most
38.
by sebcat 7y ago
https://aviation-safety.net/wikibase/220512 Beechcraft Bonanza A36TC
39.
by sebcat 7y ago
Tcl (libtommath): https://tio.run/##DY85akMBEEOv8utUGmnWswRXxp0L4wUCIWf/mVLD6E...
40.
by sebcat 7y ago
Why are logs (which I assume is not something the car needs in order to function) written to the same eMMC as the firmware?
41.
by sebcat 7y ago
> These areas will have to be bulldozed down and rebuilt IMO They did that in the 60s-70s with a part of Malmö, an area called Lugnet. That area was improved because of the gentrification that followed. The people who used to live in Lug
42.
by sebcat 7y ago
Data Flow Diagrams as described in "Structured Analysis and System Specification" (Tom DeMarco) are lightweight and provides a common way to describe a system with a focus on the flow of data. The book also goes into detail on how
43.
by sebcat 7y ago
150 pages into The Fountainhead at the moment. So far, I can highly recommend it.
44.
by sebcat 7y ago
It's possible to build FreeBSD images for amd64 with nginx and a small but fairly complete base build at about 70 MB by just tweaking src.conf and a MINIMAL kernel with virtio built in. I do this for virtualization on DO, Vultr and my
45.
by sebcat 7y ago
No one is asking ”What’s Microsoft?” though.
46.
by sebcat 7y ago
Perl is a prerequisite for Autoconf as well (not for the generated configure scripts though, thankfully). It would be nice to not have that dependency.
47.
by sebcat 7y ago
Heat and power (think PoE class) are other constraints to take into consideration.
48.
by sebcat 7y ago
What if the OS could map a shared object that resides in one section of memory into the virtual address space of multiple processes?
49.
by sebcat 7y ago
Especially on 32-bit JVMs. Still have nightmares.
50.
by sebcat 7y ago
PHP-FIG brought PHP back to life from my point of view.
51.
by sebcat 7y ago
Is it free even if you have to pay for it?
52.
by sebcat 7y ago
> One aspect was that get_user_pages doesn't give you a linear block of memory. I wrote the grotty C code to dequeue messages from the non-linearly-mapped circular buffer. The message headers could straddle page boundaries, so I cop
53.
by sebcat 7y ago
Reposting this from the other day: https://www.cl.cam.ac.uk/research/security/ctsrd/cheri/ Paper: https://www.cl.cam.ac.uk/research/security/ctsrd/pdfs/201406... &quo
54.
by sebcat 7y ago
The BERI CPU, the CHERI ISA and CheriBSD has an interesting approach to this, where they have capability-based addressing at the pointer level, supported by hardware. https://www.cl.cam.ac.uk/research/security/ctsr
55.
by sebcat 8y ago
Another best practice: Please do not use logging as an excuse to avoid implementing proper error propagation in libraries or utility code. Bad: void something_failable(void *data) { if (!is_valid(data)) { log_err("invalid
56.
by sebcat 8y ago
> Before making this in Rust we experimented with a Go and also a Lua implementation Lua or LuaJIT?
57.
by sebcat 8y ago
I like the absence of a package manager at the language level and the embracing of shared objects and stable ABIs by using the OS package manager. Missing a library? Just install it, and list it as a dependency in the .spec-file, or whateve
58.
by sebcat 8y ago
> Sweden has a major problem with housing, so you can forget renting an apartment in a major city — you will spend roughly 18 years on a waiting list to be able to rent anything in the centre of Gothenburg. This isn't hyperbole. You
59.
by sebcat 8y ago
> It doesn't sound like they were using MultiViews at all but some rewrite rule that rerouted all requests ending in .srv to a shell script in /bin The request to a.srv (in their example) was only authorized because a request t
60.
by sebcat 8y ago
Caveat: there are cases where this behavior has resulted in vulnerabilities. e.g., CVE-2018-10661[1]. So if you ever want to implement your own auth module in apache httpd you should be aware of this. [1] https://www.vdoo.com&#x2

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