Morphit

“abbabba”

“abbabba” doesn’t match the original regex but “abbaabba” does

It’s a proprietary config file. I think it’s a list of rules to forbid certain behaviours on the system. Presumably it’s downloaded by some userland service, but it has to be parsed by the kernel driver. I think the files get loaded ok but the driver crashes when iterating over an array of pointers. Possibly these are the rules and some have uninitialised pointers but this is speculation based on some kernel dumps on twitter. So the bug probably existed in the kernel driver for quite a while, but they pushed a (somehow) malformed config file that triggered the crash.

For this Channel File, yes. I don’t know what the failure rate is - this article mentions 40-70%, but there could well be a lot of variance between different companies’ machines.

The driver has presumably had this bug for some time, but they’ve never had a channel file trigger it before. I can’t find any good information on how they deploy these channel files other than that they push several changes per day. One would hope these are always run by a diverse set of test machines to validate there’s no impact to functionality but only they know the procedure there. It might vary based on how urgent a mitigation is or how invasive it’ll be - though they could just be winging it. It’d be interesting to find out exactly how this all went down.

Same. I can see some of it in between popovers about my account being suspended, getting rate limited, or of course “something went wrong”. I don’t understand why there are people who still only post there.

It’s a proprietary enterprise security product so I think it’ll be difficult to get information until they give a proper post-mortem (if they do so). Here’s hoping someone can put it all together though.

From what we have from CrowdStrike so far, the Channel File 291 update was to combat some use of Named Pipes in Windows malware.

This seems to have triggered a null pointer exception in the Falcon kernel driver as it loaded this Channel File. CrowdStrike say this is not related to the large null sections of one of the files but haven’t really explained what did trigger it.

Regardless, the kernel driver ought to have been statically analysed to detect this kind of memory hazard, or written in a language that prevents this class of bugs altogether. This is a priority of the US government right now, but CrowdStrike doesn’t seem to have got the memo.

The switches do suck but they can usually be revived with contact cleaner. If you open the mouse you can spray around the switch plunger or better yet, pop off the top half of the switch case and spray the contact directly. That completely cleared up the double click on my G402 and even revived an old MX510 that was missing clicks.

wouldn’t changing it just end up performative

Exactly. Sidereal time does get rid of time zones and leap years, but it’s still referenced to a single physical object and relies on a arbitrary choice of start point. So it doesn’t create some perfect cosmic time standard.

The international date line doesn’t help since that’s just 180° offset from Greenwich itself.

The point of standards is that they can be followed by everyone. The AD/BC epoch is fine. The Greenwich meridian is fine. UTC is fine. Changing them would cause so much disruption that it cannot be worth it.

Daylight savings can go die in a ditch though.

doesn’t change

Citation needed.

Do you use leap seconds to stay in sync with earth’s rotation? When would they be applied? How would spacefarers be notified of these updates?

Also, what meridian do you choose for this ‘universal’ time? Is it still Greenwich? Because that’s peak colonial baggage.

I can see that, but surely there wouldn’t be much difference matching the first 4bits (0x2XXX, 0xfXXX) vs the first 16 (0x0001)?
0:: is presumably all for loopback-type stuff, but I don’t see a reason not to use 1:: through 1fff:: and they would be much easier to type/remember/validate for public DNS servers which are needed before name resolution is available.

Why start at 0x2001 though? Why not 0x0001? Then we could have addresses like 1:1:1::1 or 1:2:3::4.

2606:4700:4700::1111

Hmm, maybe Google is easier:
2001:4860:4860::8888

Quad9 is 2620:fe::fe or 2620:fe::9

I don’t understand why they can’t get better addresses than that. Like surely 1::1 would be valid?

Edit: So IANA only control addresses 2001:: and up and there are quite a few IETF reservations within that. I don’t know why they picked such a high number to start at. Everything else seems IETF reserved with a little space allocated for special purposes (link-local, multicast, etc.).

Ah, come-on, why do you think Eliza could do that 60 years ago?

Does that question interest you?

They’re just like us.

I would encourage you not to split things up too finely. A single repo for your environment would allow you to see all related changes with git. E.g. if you set up a new VM it might need a playbook to set something up, a script to automate a task, and a DNS entry. With a well put together commit message explaining why you’re making those changes there’s not much need for external documentation.

Maybe if you want some more info organised in a wiki, point to the initial commit where you introduced some set up. That way you can see how something was structured. Or if you have a issue tracker you can comment with research on something and then close the issue when you commit a resolution.

Try not to have info spread out too much or maintaining all the pieces will become a chore. Make it simple and easy to keep up.

Godbolt to the rescue! So gcc 13.2 certainly does produce the same code, though a lot of other versions and compilers do it slightly differently. Surprisingly, clang doesn’t optimise this and uses idiv for the modulo version.

The point being made is that it also depends how often the ‘true’ value gets used in the code. Tests might only evaluate it a few times per run, or they could cause billions of evaluations per run. You can’t know the probability of a test failure without knowing the occurrence rate of that expression.

Usually aluminium or glass. There’s a metallic coating applied to the outside surfaces that stores the data. That layer is very thin though, so most of the material is the substrate.

Oh right, that makes sense. I was only thinking of Matter as serving low bandwidth devices but it also runs over WiFi and ethernet so I guess it can do video for security cameras etc. and evidently Casting audio and video also.

Also Matter is the smart home interop standard. Seems close enough for some confusion in what Matter compatible means on a device.

Better hope you set undofile and undodir is writable.