Subj : [$] Multiple memory classes for address-space isolation
To   : All
From : LWN.net
Date : Fri Mar 21 2025 16:30:07

[$] Multiple memory classes for address-space isolation

Date:
Fri, 21 Mar 2025 16:24:22 +0000

Description:
Brendan Jackman has been working to try to get ahead of the next hardware CPU
vulnerability
before it gets discovered. In January, he posted the second version of a 
patch set that introduces address-space isolation (ASI) as a way of
preventing future CPU vulnerabilities from leaking important
information. The core concept is to ensure that data that is not currently
needed is not present in memory, so that speculative execution cannot leak it.
The work is nowhere near ready to be incorporated into the mainline
kernel  not least of all because it has a large performance impact in its
current form  but it is likely to once again be a topic of discussion at the
2025 Linux Filesystem, Memory Management, and BPF Summit .

======================================================================
Link to news story:
https://lwn.net/Articles/1014440/


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