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From: John Levine <johnl@taugh.com>
Newsgroups: comp.arch
Subject: Re: ARM is sort of channeling the IBM 360
Date: Thu, 20 Jun 2024 18:45:47 -0000 (UTC)
Organization: Taughannock Networks
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According to John Savard  <quadibloc@servername.invalid>:
>I saw this article about a memory-proitection mechanism on ARM that
>has been  bypassed...
>
>https://www.techspot.com/news/103440-researchers-crack-arm-memory-safety-mechanism-achieve-95.html
>
>and I was struck by how similar it sounds to the memory keys used on
>the 360.

It's not that close.  S/360 had a single key in the PSW that it matched against
all of a program's storage refrences while this has the tag in a pointer, so
it's more like a capability.

The x86 protection keys are more like S/360. There's a key for each
virtual page and a PKRU register that has to match.

-- 
Regards,
John Levine, johnl@taugh.com, Primary Perpetrator of "The Internet for Dummies",
Please consider the environment before reading this e-mail. https://jl.ly