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x86/speculation: Fill RSB on vmexit for IBRS
authorJosh Poimboeuf <[email protected]>
Tue, 14 Jun 2022 21:16:15 +0000 (23:16 +0200)
committerBorislav Petkov <[email protected]>
Mon, 27 Jun 2022 08:34:00 +0000 (10:34 +0200)
commit9756bba28470722dacb79ffce554336dd1f6a6cd
tree2de4396bfa550c400fe8380e435fb28169733cd9tree | snapshot
parentbea7e31a5caccb6fe8ed989c065072354f0ecb52commit | diff
x86/speculation: Fill RSB on vmexit for IBRS

Prevent RSB underflow/poisoning attacks with RSB.  While at it, add a
bunch of comments to attempt to document the current state of tribal
knowledge about RSB attacks and what exactly is being mitigated.

Signed-off-by: Josh Poimboeuf <[email protected]>
Signed-off-by: Peter Zijlstra (Intel) <[email protected]>
Signed-off-by: Borislav Petkov <[email protected]>
arch/x86/include/asm/cpufeatures.h diff | blob | blame | history
arch/x86/kernel/cpu/bugs.c diff | blob | blame | history
arch/x86/kvm/vmx/vmenter.S diff | blob | blame | history
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