From: Rodrigo Branco bsdaemon@google.com
commit a664ec9158eeddd75121d39c9a0758016097fa96 upstream.
We missed the window between the TIF flag update and the next reschedule.
Signed-off-by: Rodrigo Branco bsdaemon@google.com Reviewed-by: Borislav Petkov (AMD) bp@alien8.de Signed-off-by: Ingo Molnar mingo@kernel.org Cc: stable@vger.kernel.org Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org --- arch/x86/kernel/cpu/bugs.c | 2 ++ 1 file changed, 2 insertions(+)
--- a/arch/x86/kernel/cpu/bugs.c +++ b/arch/x86/kernel/cpu/bugs.c @@ -1778,6 +1778,8 @@ static int ib_prctl_set(struct task_stru if (ctrl == PR_SPEC_FORCE_DISABLE) task_set_spec_ib_force_disable(task); task_update_spec_tif(task); + if (task == current) + indirect_branch_prediction_barrier(); break; default: return -ERANGE;