Mailing the story:

Linux 6.12-rc5 Disabling Intels Linear Address Masking "LAM" Due To Security Concerns

Intel merged Linear Address Masking into the Linux kernel last year as a means of allowing user-space to store metadata within some bits of pointers without masking it out before use. LAM can be useful for virtual machines, sanitizers / profiling / memory tagging, and other uses.
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