Commit a664ec91 authored by Rodrigo Branco's avatar Rodrigo Branco Committed by Ingo Molnar
Browse files

x86/bugs: Flush IBP in ib_prctl_set() 



We missed the window between the TIF flag update and the next reschedule.

Signed-off-by: default avatarRodrigo Branco <bsdaemon@google.com>
Reviewed-by: default avatarBorislav Petkov (AMD) <bp@alien8.de>
Signed-off-by: default avatarIngo Molnar <mingo@kernel.org>
Cc: <stable@vger.kernel.org>
parent 72bb8f8c

arch/x86/kernel/cpu/bugs.c

+2 −0
Original line number Diff line number Diff line
@@ -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;