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 X-Spam-Level: X-Spam-Status: No, score=-17.4 required=3.0 tests=DKIMWL_WL_MED,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_PATCH, MAILING_LIST_MULTI,SIGNED_OFF_BY,SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED, USER_AGENT_GIT,USER_IN_DEF_DKIM_WL autolearn=unavailable autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id E0AB7CA9EA0 for ; Fri, 25 Oct 2019 09:27:43 +0000 (UTC) Received: from mother.openwall.net (mother.openwall.net [195.42.179.200]) by mail.kernel.org (Postfix) with SMTP id 303E520867 for ; Fri, 25 Oct 2019 09:27:43 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=google.com header.i=@google.com header.b="W8RCJ99r" DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 303E520867 Authentication-Results: mail.kernel.org; dmarc=fail (p=reject dis=none) header.from=google.com Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=kernel-hardening-return-17109-kernel-hardening=archiver.kernel.org@lists.openwall.com Received: (qmail 1862 invoked by uid 550); 25 Oct 2019 09:27:31 -0000 Mailing-List: contact kernel-hardening-help@lists.openwall.com; run by ezmlm Precedence: bulk List-Post: List-Help: List-Unsubscribe: List-Subscribe: List-ID: Received: (qmail 18398 invoked from network); 24 Oct 2019 22:52:02 -0000 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=8uBb3Aen2dVYsBIXAkNtXm49lkX7BN4KRJO1G4p19Vk=; b=W8RCJ99rqMNSxca++LAfzgn9Hg5nsdw/jcT/ymNLnIomChmMSfpKy/5K4o/1k/cope pvdfHAJKVdtQEPr2YqdFjda4aW3t79WTLfMMzcOvvEvdTD0U6EqtgfbfxYWZVO9sjiY+ zEnGfPJbe8LS/N7vf7ALrv6LHSVfoFuWhv+dbTHpfvLSDUZ/YLX4oFvgdgo0OnugGkrj JKW1QHjgeqgxAUA740iXA+/IxD/7imuI7v3wbag+0mF+zuCp6Z2P20cdm1A7O2WfTUdI +qfMO3ffD91g9GAotg+kdf7w1pgyq08sMv2uL337HBaayPhI0S+ZBH9XK9yfohm5gvtd xHPA== 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=8uBb3Aen2dVYsBIXAkNtXm49lkX7BN4KRJO1G4p19Vk=; b=Vra2SPD+EUjxcckhTS0b/0bINR06Mfd8PQ2h7DK1F+1PNbde15KDrClMNTspAWUHYA zxf/EFJdgfKtrNNHT93nfb56Z8Rq0mVUmyAp99Ix3G2BSbL5WvqNzdVUfkPGpJLB3g6x 8WnDBWzeGpxukApupXhy02zjz2ON0k/2pVdly9v7ZuYi++mGS7ex9VeuhYDX2j2vB8uL 9akaI0hs/vr2BX23oKQd29X/bOlPnao++dJNACN/SlaMX0IEqSikWgOrki5ygjQ70b99 X84MPFmcNYkqpuzMCNOdELdXSBilVwiD6r6Jvr1KJxD4Y+FN38ebTr8bD936/PCTY0/d EbEA== X-Gm-Message-State: APjAAAUewf/R1pLWEwbbFkKemGTo5NOqsAzITJyVXmWIdJE6iNHiicX5 Pv04jaUm95Q7d25XsUtt+cw+ufZGTiRp7elLME4= X-Google-Smtp-Source: APXvYqyAW+odimb8mqBZPHs6TqxZmYsSpEILNj2+T210mEYVsUKBCmHHKxuatkppUxskg81WnKWCamKvy9hzbbiUomY= X-Received: by 2002:ae9:dec2:: with SMTP id s185mr127821qkf.283.1571957510607; Thu, 24 Oct 2019 15:51:50 -0700 (PDT) Date: Thu, 24 Oct 2019 15:51:19 -0700 In-Reply-To: <20191024225132.13410-1-samitolvanen@google.com> Message-Id: <20191024225132.13410-5-samitolvanen@google.com> Mime-Version: 1.0 References: <20191018161033.261971-1-samitolvanen@google.com> <20191024225132.13410-1-samitolvanen@google.com> X-Mailer: git-send-email 2.24.0.rc0.303.g954a862665-goog Subject: [PATCH v2 04/17] arm64: kernel: avoid x18 as an arbitrary temp register From: samitolvanen@google.com To: Will Deacon , Catalin Marinas , Steven Rostedt , Masami Hiramatsu , Ard Biesheuvel Cc: Dave Martin , Kees Cook , Laura Abbott , Mark Rutland , Nick Desaulniers , Jann Horn , Miguel Ojeda , Masahiro Yamada , clang-built-linux@googlegroups.com, kernel-hardening@lists.openwall.com, linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org, Sami Tolvanen Content-Type: text/plain; charset="UTF-8" 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(-) 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 -- 2.24.0.rc0.303.g954a862665-goog