From patchwork Fri Oct 18 16:10:19 2019 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Sami Tolvanen X-Patchwork-Id: 176895 Delivered-To: patch@linaro.org Received: by 2002:a92:7e96:0:0:0:0:0 with SMTP id q22csp1065686ill; Fri, 18 Oct 2019 09:11:04 -0700 (PDT) X-Google-Smtp-Source: APXvYqx4QiJCKWLnHl9LFQw/ZzUg3umlxO6g4gAjse11gz5/KjikitqUm5F/i5e+iz1jmoed7hYu X-Received: by 2002:a17:907:2118:: with SMTP id qn24mr9315397ejb.141.1571415064715; Fri, 18 Oct 2019 09:11:04 -0700 (PDT) ARC-Seal: i=1; a=rsa-sha256; t=1571415064; cv=none; d=google.com; s=arc-20160816; b=BxIIaefug5H2irCuQiRDs7L5dzLLtiK9BmyPoEqLj3zAxp+YXLy/Vp3RauZhvBloCh /+eZ6zNfvcxZf8lJ/y0cajNUhBb5m45PmeQiXQ5j+LwjLEqdM2oathZb/y9aHk4lUi5R 7FVu5siKNlanqLmezwctZZZwl/mO0IxzSEDNutZvp2c5ZG56klLdbaGr2LKMMPITdKOL aM8M/UXy2MZDoCCnFTTeGyJlUbxsdATggpO9TDaMn7KBXHBw9a1o2JC56mFEuc78vTDq etziJymeVwn98YiUezSN8U4QhLKBVoo63xlA/c8uzt+836yCLJn9sKHQ+vm0ZBmv/z+b MPuQ== ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=arc-20160816; h=list-id:precedence:sender:cc:to:from:subject:references :mime-version:message-id:in-reply-to:date:dkim-signature; bh=SzRVhVCQSEs4UpxvfljRvYSxQu5VFVx82TZExeQC7I8=; b=moQCPwcfm297lTEXJ9fkfL50/v8sxwXzMVeaehBEhD8Lim0X3yWgKCwJo3dmiCxYFb NchMHbv+yMdZkmo/Sh0j9srdpN1kFFUfGN9ufskKf9/gxDL1EZeNukP/145RFjqNU4HO 8S4Sz3iZPTLBAM6C5SWWJBLVH6r1ogVLidD/5zoDw0maI5fEmiKBUJZuQncoTxg0HhYY kL7qPASn56SZhIK53O9c6c2ozhj17hDEzDXjqNP6cNlAJHqX6U1PeSclz4EmP4fFMX3k 8pyyrY6xOa46Ek3piHhALwVB8/QKmTrONKUUNoyTL0WlPcMobwDWosUQf2IlpmhboKax Heog== ARC-Authentication-Results: i=1; mx.google.com; dkim=pass header.i=@google.com header.s=20161025 header.b=TZOVdcpB; spf=pass (google.com: best guess record for domain of linux-kernel-owner@vger.kernel.org designates 209.132.180.67 as permitted sender) smtp.mailfrom=linux-kernel-owner@vger.kernel.org; dmarc=pass (p=REJECT sp=REJECT dis=NONE) header.from=google.com Return-Path: Received: from vger.kernel.org (vger.kernel.org. [209.132.180.67]) by mx.google.com with ESMTP id d27si4229942ede.381.2019.10.18.09.11.04; Fri, 18 Oct 2019 09:11:04 -0700 (PDT) Received-SPF: pass (google.com: best guess record for domain of linux-kernel-owner@vger.kernel.org designates 209.132.180.67 as permitted sender) client-ip=209.132.180.67; Authentication-Results: mx.google.com; dkim=pass header.i=@google.com header.s=20161025 header.b=TZOVdcpB; spf=pass (google.com: best guess record for domain of linux-kernel-owner@vger.kernel.org designates 209.132.180.67 as permitted sender) smtp.mailfrom=linux-kernel-owner@vger.kernel.org; dmarc=pass (p=REJECT sp=REJECT dis=NONE) header.from=google.com Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S2442946AbfJRQLA (ORCPT + 26 others); Fri, 18 Oct 2019 12:11:00 -0400 Received: from mail-pl1-f201.google.com ([209.85.214.201]:41358 "EHLO mail-pl1-f201.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S2442937AbfJRQK7 (ORCPT ); Fri, 18 Oct 2019 12:10:59 -0400 Received: by mail-pl1-f201.google.com with SMTP id b10so4032543pls.8 for ; Fri, 18 Oct 2019 09:10:59 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=20161025; h=date:in-reply-to:message-id:mime-version:references:subject:from:to :cc; bh=SzRVhVCQSEs4UpxvfljRvYSxQu5VFVx82TZExeQC7I8=; b=TZOVdcpBJiow5T4VOPKVfmYmovhUmd2ZBG9xflMRKW8S5BQ2L7yu5g6JY0/TCCHH+I XufZXerCCZfchS8x9jnvOoLMze/QWKGKm/0eGk215XJdEA1kME5jv8jnjb92Pb1eVWkw yiTgUjP8Rao1lkPZ3wsgn20YfPu5vdw09AcOGQOKuwSW35OqEXFlPzTQhP7pZvaCNMAW MWtaplAUSr+50SFN34KRGzFF9OlQtJcKYXSWZanQMwKs4H+DZ9A3MX4sVyK4cRYJFJ+w rlR21WxyyCXlD1Tc/Mn6bTnrGGsiH8nauEVx60lyfrl/C39gDgUhzHfYMSQ6uZ9ljLwO QH/g== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:date:in-reply-to:message-id:mime-version :references:subject:from:to:cc; bh=SzRVhVCQSEs4UpxvfljRvYSxQu5VFVx82TZExeQC7I8=; b=R3Qxzdx0DRgYjw7UYw8BRDlmWDBUZc0Hvb95sh9dyDRH/M9iBeMvPUECWOdmNqJM5J UpkIRTa92koufrNqfyjCURLoyGeyT6BL6hAEvxxPH3shBdtjrpZH7DK3Zm86dLUV2IPF UBEEj/diZoeYUsOiAMVFYdhIVO05vtq6lNiMuw6WdKuVXL3/q1asoIGPqajGoM8KUguB GzIi2bou0RJLjkiEozIwlujGrXwtFHb6BDghFYv7MP+KPUou8SOo8lXuzKo6W8gmJBfK gnmGz7rt+/B67q3D9SjHxI7+1+WtcZ7xqW9qOzhaE8qF4Fn70SkWO8VbJ9uf9HeMjbEc P/Og== X-Gm-Message-State: APjAAAWhLq/P86jLJOjEw/fPS5kWZtXQ3nfUZ2OwP0Ej2VOXMRE5U+9M pRptgrE1Oa0ewt/B/C9VDpuDirbTLg8Ldn/Ey8c= X-Received: by 2002:a65:68c2:: with SMTP id k2mr10843389pgt.241.1571415058696; Fri, 18 Oct 2019 09:10:58 -0700 (PDT) Date: Fri, 18 Oct 2019 09:10:19 -0700 In-Reply-To: <20191018161033.261971-1-samitolvanen@google.com> Message-Id: <20191018161033.261971-5-samitolvanen@google.com> Mime-Version: 1.0 References: <20191018161033.261971-1-samitolvanen@google.com> X-Mailer: git-send-email 2.23.0.866.gb869b98d4c-goog Subject: [PATCH 04/18] arm64: kernel: avoid x18 as an arbitrary temp register From: Sami Tolvanen To: Will Deacon , Catalin Marinas , Steven Rostedt , Ard Biesheuvel Cc: Dave Martin , Kees Cook , Laura Abbott , Mark Rutland , Nick Desaulniers , clang-built-linux@googlegroups.com, kernel-hardening@lists.openwall.com, linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org, Sami Tolvanen Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: Ard Biesheuvel The code in __cpu_soft_restart() uses x18 as an arbitrary temp register, which will shortly be disallowed. So use x8 instead. Link: https://patchwork.kernel.org/patch/9836877/ Signed-off-by: Ard Biesheuvel Signed-off-by: Sami Tolvanen --- arch/arm64/kernel/cpu-reset.S | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) -- 2.23.0.866.gb869b98d4c-goog diff --git a/arch/arm64/kernel/cpu-reset.S b/arch/arm64/kernel/cpu-reset.S index 6ea337d464c4..32c7bf858dd9 100644 --- a/arch/arm64/kernel/cpu-reset.S +++ b/arch/arm64/kernel/cpu-reset.S @@ -42,11 +42,11 @@ ENTRY(__cpu_soft_restart) mov x0, #HVC_SOFT_RESTART hvc #0 // no return -1: mov x18, x1 // entry +1: mov x8, x1 // entry mov x0, x2 // arg0 mov x1, x3 // arg1 mov x2, x4 // arg2 - br x18 + br x8 ENDPROC(__cpu_soft_restart) .popsection