From nobody Fri Apr 10 08:07:13 2026 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 2F09FC4332F for ; Wed, 4 Jan 2023 11:59:38 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S239200AbjADL7J (ORCPT ); Wed, 4 Jan 2023 06:59:09 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:34164 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S239116AbjADL7B (ORCPT ); Wed, 4 Jan 2023 06:59:01 -0500 Received: from galois.linutronix.de (Galois.linutronix.de [IPv6:2a0a:51c0:0:12e:550::1]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 493391EC5E; Wed, 4 Jan 2023 03:59:00 -0800 (PST) Date: Wed, 04 Jan 2023 11:58:57 -0000 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linutronix.de; s=2020; t=1672833538; h=from:from:sender:sender:reply-to:reply-to:subject:subject:date:date: message-id:message-id:to:to:cc:cc:mime-version:mime-version: content-type:content-type: content-transfer-encoding:content-transfer-encoding; bh=+n2ZcuHyYQSIvPOuKhwvmkaHaWyKOGj/JfAklwx+MxU=; b=Xbz8Grh+urUwKujbRtQx5LM4M/FBOoc4fw9A5cav8F0RZU5/NOLvMbS+XZhAG8XxqsCTmv yEj6lx1A1U9YmrOlDRr152+RG9UpEAm+BeZEuA2Csrp+NnthIHHA5hPQBUz8fi62jn2yMi zqjBM6Si57Rs98yuFNdoXA4Tg7uWeB2r3biYG8jU3CF9BxKX3ggl3UpAGRIOo8oJGxYOcb RERO6kLlQhVqdUGxunhGGIrx356+N5W23QbNWA6dvBHXZ7XsvR30H2ZbSXKMEatpkSXftD nUbVyTNGAqA9n6aVILjyXX5JKZkPZkCvwe3YA8rW0A+KPTcCdNLc7/PhKNA5Lw== DKIM-Signature: v=1; a=ed25519-sha256; c=relaxed/relaxed; d=linutronix.de; s=2020e; t=1672833538; h=from:from:sender:sender:reply-to:reply-to:subject:subject:date:date: message-id:message-id:to:to:cc:cc:mime-version:mime-version: content-type:content-type: content-transfer-encoding:content-transfer-encoding; bh=+n2ZcuHyYQSIvPOuKhwvmkaHaWyKOGj/JfAklwx+MxU=; b=JAHylUUA7jd66QVeVdn/gYui89nlgS18uubG3jOSVL4goX9RqpNispLQiMeFHrbvDI8RfP fVtVzuBEiOxZ/jBQ== From: "tip-bot2 for Rodrigo Branco" Sender: tip-bot2@linutronix.de Reply-to: linux-kernel@vger.kernel.org To: linux-tip-commits@vger.kernel.org Subject: [tip: x86/urgent] x86/bugs: Flush IBP in ib_prctl_set() Cc: Rodrigo Branco , "Borislav Petkov (AMD)" , Ingo Molnar , , x86@kernel.org, linux-kernel@vger.kernel.org MIME-Version: 1.0 Message-ID: <167283353750.4906.14334038214138785293.tip-bot2@tip-bot2> Robot-ID: Robot-Unsubscribe: Contact to get blacklisted from these emails Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: quoted-printable Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org The following commit has been merged into the x86/urgent branch of tip: Commit-ID: a664ec9158eeddd75121d39c9a0758016097fa96 Gitweb: https://git.kernel.org/tip/a664ec9158eeddd75121d39c9a0758016= 097fa96 Author: Rodrigo Branco AuthorDate: Tue, 03 Jan 2023 14:17:51 -06:00 Committer: Ingo Molnar CommitterDate: Wed, 04 Jan 2023 11:25:32 +01:00 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 Reviewed-by: Borislav Petkov (AMD) Signed-off-by: Ingo Molnar Cc: --- arch/x86/kernel/cpu/bugs.c | 2 ++ 1 file changed, 2 insertions(+) diff --git a/arch/x86/kernel/cpu/bugs.c b/arch/x86/kernel/cpu/bugs.c index d970ddb..bca0bd8 100644 --- 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, uns= igned long ctrl) if (ctrl =3D=3D PR_SPEC_FORCE_DISABLE) task_set_spec_ib_force_disable(task); task_update_spec_tif(task); + if (task =3D=3D current) + indirect_branch_prediction_barrier(); break; default: return -ERANGE;