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Description: Indirect Branch Prediction Barrier is force-disabled when STIBP is unavailable or enhanced IBRS is available.
References:
https://lkml.org/lkml/2020/6/9/183
https://www.openwall.com/lists/oss-security/2020/06/10/1
https://bugzilla.redhat.com/show_bug.cgi?id=1845867
Notes:
carnil> Commit fixes 7cc765a67d8e ("x86/speculation: Enable prctl mode
carnil> for spectre_v2_user")
Bugs:
upstream: needed
4.19-upstream-stable: needed
4.9-upstream-stable: needed
3.16-upstream-stable: needed
sid: needed
4.19-buster-security: needed
4.9-stretch-security: needed
3.16-jessie-security: needed
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