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| author | Josh Poimboeuf <[email protected]> | 2022-06-14 23:16:16 +0200 |
|---|---|---|
| committer | Borislav Petkov <[email protected]> | 2022-06-27 10:34:00 +0200 |
| commit | 07853adc29a058c5fd143c14e5ac528448a72ed9 (patch) | |
| tree | 6336e1982537e7d9db862efcaa66157bf400b1ce /tools/perf/util/scripting-engines/trace-event-python.c | |
| parent | 9756bba28470722dacb79ffce554336dd1f6a6cd (diff) | |
KVM: VMX: Prevent RSB underflow before vmenter
On VMX, there are some balanced returns between the time the guest's
SPEC_CTRL value is written, and the vmenter.
Balanced returns (matched by a preceding call) are usually ok, but it's
at least theoretically possible an NMI with a deep call stack could
empty the RSB before one of the returns.
For maximum paranoia, don't allow *any* returns (balanced or otherwise)
between the SPEC_CTRL write and the vmenter.
[ bp: Fix 32-bit build. ]
Signed-off-by: Josh Poimboeuf <[email protected]>
Signed-off-by: Peter Zijlstra (Intel) <[email protected]>
Signed-off-by: Borislav Petkov <[email protected]>
Diffstat (limited to 'tools/perf/util/scripting-engines/trace-event-python.c')
0 files changed, 0 insertions, 0 deletions