x86/bugs: Enable STIBP for JMP2RET

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commit e8ec1b6e08 upstream.

For untrained return thunks to be fully effective, STIBP must be enabled
or SMT disabled.

Co-developed-by: Josh Poimboeuf <jpoimboe@redhat.com>
Signed-off-by: Josh Poimboeuf <jpoimboe@redhat.com>
Signed-off-by: Kim Phillips <kim.phillips@amd.com>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Signed-off-by: Borislav Petkov <bp@suse.de>
Signed-off-by: Thadeu Lima de Souza Cascardo <cascardo@canonical.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

...

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Kim Phillips 2022-06-14 23:15:51 +02:00 • committed by Greg Kroah-Hartman

parent 89eba42632

commit b4e05ea71e

2 changed files with 57 additions and 17 deletions

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16

Documentation/admin-guide/kernel-parameters.txt

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58

arch/x86/kernel/cpu/bugs.c

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