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| author | Pawan Gupta <[email protected]> | 2024-01-23 19:55:21 -0800 |
|---|---|---|
| committer | Dave Hansen <[email protected]> | 2024-10-21 15:05:43 -0700 |
| commit | 3267cb6d3a174ff83d6287dcd5b0047bbd912452 (patch) | |
| tree | 3012a2225e382fbad6c7bfe628288acde710f9d8 /scripts/generate_rust_analyzer.py | |
| parent | ffd95846c6ec6cf1f93da411ea10d504036cab42 (diff) | |
x86/lam: Disable ADDRESS_MASKING in most cases
Linear Address Masking (LAM) has a weakness related to transient
execution as described in the SLAM paper[1]. Unless Linear Address
Space Separation (LASS) is enabled this weakness may be exploitable.
Until kernel adds support for LASS[2], only allow LAM for COMPILE_TEST,
or when speculation mitigations have been disabled at compile time,
otherwise keep LAM disabled.
There are no processors in market that support LAM yet, so currently
nobody is affected by this issue.
[1] SLAM: https://download.vusec.net/papers/slam_sp24.pdf
[2] LASS: https://lore.kernel.org/lkml/[email protected]/
[ dhansen: update SPECULATION_MITIGATIONS -> CPU_MITIGATIONS ]
Signed-off-by: Pawan Gupta <[email protected]>
Signed-off-by: Dave Hansen <[email protected]>
Reviewed-by: Sohil Mehta <[email protected]>
Acked-by: Kirill A. Shutemov <[email protected]>
Cc:[email protected]
Link: https://lore.kernel.org/all/5373262886f2783f054256babdf5a98545dc986b.1706068222.git.pawan.kumar.gupta%40linux.intel.com
Diffstat (limited to 'scripts/generate_rust_analyzer.py')
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