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=-9.1 required=3.0 tests=DKIMWL_WL_HIGH,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_PATCH, MAILING_LIST_MULTI,SIGNED_OFF_BY,SPF_HELO_NONE,SPF_PASS,USER_AGENT_GIT autolearn=ham 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 C0540C04AAC for ; Mon, 20 May 2019 23:20:48 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 924262171F for ; Mon, 20 May 2019 23:20:48 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (1024-bit key) header.d=chromium.org header.i=@chromium.org header.b="d0sVux2H" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727519AbfETXUs (ORCPT ); Mon, 20 May 2019 19:20:48 -0400 Received: from mail-pl1-f196.google.com ([209.85.214.196]:45358 "EHLO mail-pl1-f196.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1727382AbfETXUQ (ORCPT ); Mon, 20 May 2019 19:20:16 -0400 Received: by mail-pl1-f196.google.com with SMTP id a5so7396782pls.12 for ; Mon, 20 May 2019 16:20:15 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=chromium.org; s=google; h=from:to:cc:subject:date:message-id:in-reply-to:references :mime-version:content-transfer-encoding; bh=7zcfl54ngcYZWe7SGjAVojGJkuuDkL2OOBnEHI8Zvuw=; b=d0sVux2H+Kp0vgnzWLkwaPIwsszW/blM2lWdjPDmAFb+mqIIG1s6CfAJxjwUcbjY6o fNLaPs6m1ivpVT8hWujSHn6V/uWK7/QnVmFz+fqPxMJVze0DAEF6km91b6qVleXbbxxt RAsVRk1pUchvj8zQPNU2JSeZCF/beeoFod/HU= X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:from:to:cc:subject:date:message-id:in-reply-to :references:mime-version:content-transfer-encoding; bh=7zcfl54ngcYZWe7SGjAVojGJkuuDkL2OOBnEHI8Zvuw=; b=P2x864uxSGeiu9CfvS3hWMfVZQAvNZH9XDXXeghw4l9PfaL58jix5pabUV7PmTtHjL 3EpV9ZNLuFzq8x+7yj14Xr0kXciIVawlejoiMSL9IGmpS3KiITlHM3yVtkQmmVCdpTNR WclL/FulX2L72DugIihCZsRU+aHei7nGqmZ4gI7m9qDPQMkyGELuxDmRe2s1bz3MgiVq 8N/yuDcWcCcncmhf/Hi5w2mTHtOzpVggqslRxPN+cbd/cJH2q1Gb2eYkIfyVs0KHoKSd CRiUISanpHin++oUqr35QQbhSI7rNbAwT+gM+W7Kz4fVWzqnitvNPvJDXnKYlsRyQ8vp IK9A== X-Gm-Message-State: APjAAAXfHPFpxOdtFgcUusIlM3otbEwzdN+svUJ6P9+a/VnmcYYrDUVL Z8gWGdJtznLNJwYk1coyrX81kw== X-Google-Smtp-Source: APXvYqyR5iFeDrOxrxE1hHhUIn+dH4BeM6Xeg5KaFIUtHRV7653rxOhVDxMaJjYMO0sQEPJqcLk2Sg== X-Received: by 2002:a17:902:e213:: with SMTP id ce19mr80568333plb.30.1558394415530; Mon, 20 May 2019 16:20:15 -0700 (PDT) Received: from skynet.sea.corp.google.com ([2620:0:1008:1100:c4b5:ec23:d87b:d6d3]) by smtp.gmail.com with ESMTPSA id h13sm19350861pgk.55.2019.05.20.16.20.13 (version=TLS1_2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128); Mon, 20 May 2019 16:20:14 -0700 (PDT) From: Thomas Garnier To: kernel-hardening@lists.openwall.com Cc: kristen@linux.intel.com, Thomas Garnier , Thomas Gleixner , Ingo Molnar , Borislav Petkov , "H. Peter Anvin" , x86@kernel.org, Andrew Morton , Andi Kleen , Andy Lutomirski , linux-kernel@vger.kernel.org Subject: [PATCH v7 07/12] x86/CPU: Adapt assembly for PIE support Date: Mon, 20 May 2019 16:19:32 -0700 Message-Id: <20190520231948.49693-8-thgarnie@chromium.org> X-Mailer: git-send-email 2.21.0.1020.gf2820cf01a-goog In-Reply-To: <20190520231948.49693-1-thgarnie@chromium.org> References: <20190520231948.49693-1-thgarnie@chromium.org> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: Thomas Garnier Change the assembly code to use only relative references of symbols for the kernel to be PIE compatible. Use the new _ASM_MOVABS macro instead of the 'mov $symbol, %dst' construct. Position Independent Executable (PIE) support will allow to extend the KASLR randomization range below 0xffffffff80000000. Signed-off-by: Thomas Garnier --- arch/x86/include/asm/processor.h | 6 ++++-- 1 file changed, 4 insertions(+), 2 deletions(-) diff --git a/arch/x86/include/asm/processor.h b/arch/x86/include/asm/processor.h index c34a35c78618..5490a6ead17c 100644 --- a/arch/x86/include/asm/processor.h +++ b/arch/x86/include/asm/processor.h @@ -710,11 +710,13 @@ static inline void sync_core(void) "pushfq\n\t" "mov %%cs, %0\n\t" "pushq %q0\n\t" - "pushq $1f\n\t" + "movabsq $1f, %q0\n\t" + "pushq %q0\n\t" "iretq\n\t" UNWIND_HINT_RESTORE "1:" - : "=&r" (tmp), ASM_CALL_CONSTRAINT : : "cc", "memory"); + : "=&r" (tmp), ASM_CALL_CONSTRAINT + : : "cc", "memory"); #endif } -- 2.21.0.1020.gf2820cf01a-goog