Viewing profile — hansendc

"On x86-64, there are two CPU settings which control the kernel’s ability to access memory." There are a couple more than two, even in 2021. Memory Protection Keys come to mind, as…

Here's an implementation that one of the OpenStreetmap applications uses: https://josm.openstreetmap.de/browser/josm/trunk/src/org/ope... It used to use a linear list of points, bu…

The AVX disable is only when you use "gather_data_sampling=force". The default is to leave AVX alone and proclaim the system to be vulnerable. From https://git.kernel.org/pub/scm/l…

Uh... Did I miss the patches that add a pre-zeroed page pool to Linux? Wouldn't be the first time I missed something like that getting added, but 6.3-rc5 definitely zeroes _some_ p…

> there's no way[0][1] to express R^X, PROT_EXEC without PROT_READ is not possible. I'll also add a [2]: [2] There's no way to do it in the page tables. But, if you have Protection…

There honestly isn't that much "tech" to speak of here. We were literally talking about "immutable" mappings last week in Linux land: https://lore.kernel.org/all/b4f0dca5-1d15-67f7…

There's at least one extremely well documented example of a killer whale that played extensively with boats: https://en.wikipedia.org/wiki/Luna_(orca) Granted, this was a lonely li…

They actually leave lots of evidence. A transient eating a seal is messy business and there are lots of seal bits and chunks left over. Eva Saulitis describes the aftermath in seve…

From: https://arstechnica.com/gadgets/2020/10/in-a-first-researche... "In a statement, Intel officials wrote: ... we do not rely on obfuscation of information behind red unlock as …

Actually, its primary design goal is to make address sanitizers faster. Right now, all the code that touches a sanitizer-tagged address must be recompiled to understand how to plac…

By an "AMD push" do you mean Intel should post a superior implementation a year before AMD does? ;) https://lore.kernel.org/lkml/20210205151631.43511-1-kirill.s... BTW, MPX was cle…

It's not just drivers. It's really about ensuring that the folks that maintain the kernel have a way to test the code they maintain. The reasons that we (the kernel maintainers) ha…

Yes, it's been a pretty close relationship for a long, long time. What does Intel get out of this? I'm really hoping that Intel gets help improving the kernel from a talented bunch…

I hope so too! But, I was trying to think of if I've ever seen the Linutronix folks working on the Intel graphics code. I don't think I have: https://git.kernel.org/pub/scm/linux/k…

"It may do the wrong thing at the worst time" -- each FSD Beta announcement email.

> So, basically, I need to somehow predict that FSD will do the wrong thing and react myself, _before_ the worst time, because the worst time is when it's already too late. Don't c…

I personally have a tendency to match the speed of the cars around me. IMNHO, most cars speed through school zones. I use cruise control as a tool to prevent me from accidentally m…

> Where does Tesla provide a list of such limitations for it's customers, One specific place is first sentence of the FSD Beta welcome email: "Full Self-Driving is in limited early…

I think the main point is to know the limitations of the technology and to deploy it appropriately. For instance, I don't rely on old-school cruise control to stop for small childr…

I sure hope it stays around in servers for a long time. Some of us at Intel are actively working on expanding the existing kernel support: https://lore.kernel.org/lkml/cover.163838…

The Y's overall visibility is objectively better than my old sedan. It's also really hard to have that really aerodynamic shape and good rear visibility. The Y's visibility reminds…

They turned my radar off when I got the FSD beta. It's hard to tell what is from losing radar versus getting FSD itself, but I think I liked the radar better. It seemed to perform …

The rear visibility felt weird when I test drove it for sure, coming from a normal sedan. But, over a year in to ownership, it never feels tiny when driving it. All the cameras and…

> "the meltdown patch in the kernel thats disabled by default" I'm not sure to what you are referring to here. I was one of the people who worked on the Linux PTI implementation th…

While there are ways to disable mitigation against many of the side-channel issues, this is not one of them. I believe this one is mitigated by the "sbb;and" sequence here: https:/…