From nobody Sun Feb 8 12:36:36 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 8F3C4EB64DC for ; Fri, 21 Jul 2023 16:11:14 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S230093AbjGUQLN (ORCPT ); Fri, 21 Jul 2023 12:11:13 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:39176 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S232045AbjGUQKx (ORCPT ); Fri, 21 Jul 2023 12:10:53 -0400 Received: from mail-qt1-x832.google.com (mail-qt1-x832.google.com [IPv6:2607:f8b0:4864:20::832]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id B721A3586 for ; Fri, 21 Jul 2023 09:10:48 -0700 (PDT) Received: by mail-qt1-x832.google.com with SMTP id d75a77b69052e-403b6b7c0f7so17586451cf.0 for ; Fri, 21 Jul 2023 09:10:48 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20221208; t=1689955847; x=1690560647; h=content-transfer-encoding:mime-version:references:in-reply-to :message-id:date:subject:cc:to:from:from:to:cc:subject:date :message-id:reply-to; bh=tfQVUJeG82Bn7jUnxAG1fPc5fzriqyrGkxLsws2Rhtc=; b=FlKm/uhne4Q4zTBXZJj8mnli3+gsAwYvEmHxdunziS1nhM8Jnq8CdAZ0Au0Nzz/yyn /YHyemgMxFP6flT3BtZFWRTTY8Eex1vmcgHxQKDK0GaR/rj2ZApZqXL8Nb47PnGjwwQ+ bFT/4aGMrzFY/owB+fbsGAGNv0U7XutlcKB5l/4xCfIi76irlQ06ep07BSr19VJmVUwo 94RMHoBS95r3F/osFB8YsBoxMuI2SVil/EWQ+EkSmBGY8CkfXU0Ihv3cXwv826o8QNce omi4F2eopr0YfPZe/jH5a9WyKTxkUw3rfsLFdKE+YuYuT74j8bmohPGeqnO9tDnAdNGZ T0ZA== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20221208; t=1689955847; x=1690560647; h=content-transfer-encoding:mime-version:references:in-reply-to :message-id:date:subject:cc:to:from:x-gm-message-state:from:to:cc :subject:date:message-id:reply-to; bh=tfQVUJeG82Bn7jUnxAG1fPc5fzriqyrGkxLsws2Rhtc=; b=TCBYZFS6routxJUm39EWxWqoU34tmOnVBPEqnVgHA2WksL4a436L7AwvBmtjUOdS3c zUqenU94DRw22oFWcBmXJ8s0R0RtNqwTr0PyWYR3FKOHcN0Z/NP2iO9PsQ+3Tz4RDZoo jQcvth9HyakupBWScnj0IJ/yBn7PXuRV9MIKONBfaUgB7/ICyrkfJGzksmM36npRhkkY lEjJNDCWNdnQPdso1NWOIuBvuLk+OqlqGtAOQn5AEsQR1QNn+qfzIW2BdfbxcmvLrJzP F4MXh0UGfDnWyYRyMDbpHxqCk1ztFpZYn5kprlCmt/IHIcWX8KKvrx8JqYZ31emn8aAv TpkQ== X-Gm-Message-State: ABy/qLZaNrUhy2Co+CDkVn0lH/VKLbCLGumq3k+lq/dqCEcEqZgXd4bE mO9m+s0WLX8QQYdnDjoqUjM8f5uDgA== X-Google-Smtp-Source: APBJJlG7RCBET81XQQpwgB5hMP0SCzt9vuHR+TpDGjyb9suYeQprBmbYBMbEAg+WDVqVb3dhPW3Cug== X-Received: by 2002:a05:622a:190a:b0:403:6fe6:3160 with SMTP id w10-20020a05622a190a00b004036fe63160mr619325qtc.61.1689955847108; Fri, 21 Jul 2023 09:10:47 -0700 (PDT) Received: from citadel.. (047-026-243-217.res.spectrum.com. [47.26.243.217]) by smtp.gmail.com with ESMTPSA id c16-20020ac87d90000000b004054fbf9273sm311286qtd.80.2023.07.21.09.10.45 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Fri, 21 Jul 2023 09:10:46 -0700 (PDT) From: Brian Gerst To: linux-kernel@vger.kernel.org, x86@kernel.org Cc: Thomas Gleixner , Borislav Petkov , "H . Peter Anvin" , Andy Lutomirski , =?UTF-8?q?Mika=20Penttil=C3=A4?= , Brian Gerst Subject: [PATCH v2 5/6] x86/entry/32: Remove SEP test for SYSEXIT Date: Fri, 21 Jul 2023 12:10:16 -0400 Message-ID: <20230721161018.50214-6-brgerst@gmail.com> X-Mailer: git-send-email 2.41.0 In-Reply-To: <20230721161018.50214-1-brgerst@gmail.com> References: <20230721161018.50214-1-brgerst@gmail.com> MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Type: text/plain; charset="utf-8" SEP must be already be present in order for do_fast_syscall_32() to be called on native 32-bit, so checking it again is unnecessary. Signed-off-by: Brian Gerst --- arch/x86/entry/common.c | 3 +-- 1 file changed, 1 insertion(+), 2 deletions(-) diff --git a/arch/x86/entry/common.c b/arch/x86/entry/common.c index 5b3594457af3..4d7d6d25dda9 100644 --- a/arch/x86/entry/common.c +++ b/arch/x86/entry/common.c @@ -265,8 +265,7 @@ __visible noinstr bool do_fast_syscall_32(struct pt_reg= s *regs) * We don't allow syscalls at all from VM86 mode, but we still * need to check VM, because we might be returning from sys_vm86. */ - return static_cpu_has(X86_FEATURE_SEP) && - regs->cs =3D=3D __USER_CS && regs->ss =3D=3D __USER_DS && + return regs->cs =3D=3D __USER_CS && regs->ss =3D=3D __USER_DS && regs->ip =3D=3D landing_pad && (regs->flags & (X86_EFLAGS_RF | X86_EFLAGS_TF | X86_EFLAGS_VM)) =3D=3D 0; #endif --=20 2.41.0