From mboxrd@z Thu Jan 1 00:00:00 1970 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 D830EEB64DC for ; Fri, 21 Jul 2023 16:10:52 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S231187AbjGUQKu (ORCPT ); Fri, 21 Jul 2023 12:10:50 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:38954 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S231357AbjGUQKp (ORCPT ); Fri, 21 Jul 2023 12:10:45 -0400 Received: from mail-qt1-x830.google.com (mail-qt1-x830.google.com [IPv6:2607:f8b0:4864:20::830]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id B772A3592 for ; Fri, 21 Jul 2023 09:10:40 -0700 (PDT) Received: by mail-qt1-x830.google.com with SMTP id d75a77b69052e-4039f7e1d3aso17432201cf.0 for ; Fri, 21 Jul 2023 09:10:40 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20221208; t=1689955839; x=1690560639; h=content-transfer-encoding:mime-version:message-id:date:subject:cc :to:from:from:to:cc:subject:date:message-id:reply-to; bh=timtvy/ZgJHBSalkwoR7FMzJpYWzvYaEK+8pGoIzPrc=; b=OT/31xBDBJJm0IeZ+M3IDRbHd6zlPalkDJFVQTVxIyWSFPbFrRwPJRQZjHNpOMJcEl 3KlBhybdSYkLgzvwduacu+Js3tBex4ABGpfhM1HCRJ6YtWwYls4Wc0DdTIt49g7QbVGE mqYp8FBO5/lHgdATYM4aUJjc0QrFf0IK70qdmTJc/JLztD4RkTJ3ZENZL/K88wu+Catk AIKf/uQ58vHfCfEh8EuOQxX2WCAemoe3c1HzlgqR3LA3hg0SbxRSNQC9mHF6Sm6ZoYbh knTpTAdylkbQNihmnGUwHakICuHnYNBhFJCW62SevQk8S73N2+qd6YuQa6lH8JAnZdr6 Pozw== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20221208; t=1689955839; x=1690560639; h=content-transfer-encoding:mime-version:message-id:date:subject:cc :to:from:x-gm-message-state:from:to:cc:subject:date:message-id :reply-to; bh=timtvy/ZgJHBSalkwoR7FMzJpYWzvYaEK+8pGoIzPrc=; b=E4DKLrkAHcWf5XDgsmPAaEsfJQy9Qn5/GyaivHxfbDlbxKTIxRtnTu817Dx+5kQxOs H4bpTLC8WjFwEEDCWO97KjkIx1eCCbb6p6991IwBjlNdHChphzey13u9XckupuLajtgr DPwk/adeYAD08ySQUfcaHiXcxWOF190mfDLNgI5Dwx8aD11aKdd91FXVVJzH1fkaaxAY lePf8tT7+iiyeNwrJ0EacncQmOCeY/dfGGt9//vOwOh/ntXqZ43y3Q+iGnQUfnOCY9yl aNjPWjFUTo8HcHR6/bAK2MhkRT6cNGfO/jOVa6fctkO6sSaR/ZiPvo1fIH4W+ubMtvHI XeEQ== X-Gm-Message-State: ABy/qLbopXnuNJCdDD1maj/nHEff9Ai6uBHhA8YEj2/1Hz1G81Wm4jWP oNDDCndOsNMxcU8lNXhd/eegkncDyQ== X-Google-Smtp-Source: APBJJlGy8/3aVI/ONBTT9VVt/QSoHj1WSpULXy7Lsmb/CmNv6GbYGW1+0ATdnSEMuC/tt7MUZLnJcw== X-Received: by 2002:ac8:7fce:0:b0:405:438a:baef with SMTP id b14-20020ac87fce000000b00405438abaefmr500344qtk.51.1689955838950; Fri, 21 Jul 2023 09:10:38 -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.80.2023.07.21.09.10.37 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Fri, 21 Jul 2023 09:10:37 -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 0/6] x86: Clean up fast syscall return validation Date: Fri, 21 Jul 2023 12:10:11 -0400 Message-ID: <20230721161018.50214-1-brgerst@gmail.com> X-Mailer: git-send-email 2.41.0 MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org This patch set cleans up the tests done to determine if a fast syscall return instruction can be used to return to userspace. It converts the code to C, and refactors existing code to be more readable. v2: - Fix shift value for canonical RIP test and use __is_canonical_address() Brian Gerst (6): x86/entry/64: Remove obsolete comment on tracing vs. SYSRET x86/entry/64: Convert SYSRET validation tests to C x86/entry/compat: Combine return value test from syscall handler x86/entry/32: Convert do_fast_syscall_32() to bool return type x86/entry/32: Remove SEP test for SYSEXIT x86/entry/32: Clean up syscall fast exit tests arch/x86/entry/common.c | 99 +++++++++++++++++++++----------- arch/x86/entry/entry_32.S | 2 +- arch/x86/entry/entry_64.S | 68 +--------------------- arch/x86/entry/entry_64_compat.S | 12 ++-- arch/x86/include/asm/syscall.h | 6 +- 5 files changed, 77 insertions(+), 110 deletions(-) -- 2.41.0