x86/bugs: Flush IBP in ib_prctl_set()

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>

diff --git a/arch/x86/kernel/cpu/bugs.c b/arch/x86/kernel/cpu/bugs.c
index d970ddb0cc65bedf358c32321d202036cf792923..bca0bd8f4846413831da02ec7eee8ae9c12abd12 100644 (file)
--- a/arch/x86/kernel/cpu/bugs.c
+++ b/arch/x86/kernel/cpu/bugs.c
@@ -1981,6 +1981,8 @@ static int ib_prctl_set(struct task_struct *task, unsigned long ctrl)
                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;