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=-8.3 required=3.0 tests=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_SANE_1 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 F27ECC433FF for ; Tue, 30 Jul 2019 09:25:59 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id CA16A208E4 for ; Tue, 30 Jul 2019 09:25:59 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (1024-bit key) header.d=c-s.fr header.i=@c-s.fr header.b="MwaqkRm4" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1731275AbfG3JZ6 (ORCPT ); Tue, 30 Jul 2019 05:25:58 -0400 Received: from pegase1.c-s.fr ([93.17.236.30]:49751 "EHLO pegase1.c-s.fr" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1728824AbfG3JZz (ORCPT ); Tue, 30 Jul 2019 05:25:55 -0400 Received: from localhost (mailhub1-int [192.168.12.234]) by localhost (Postfix) with ESMTP id 45yWPr5TVtz9v6rL; Tue, 30 Jul 2019 11:25:52 +0200 (CEST) Authentication-Results: localhost; dkim=pass reason="1024-bit key; insecure key" header.d=c-s.fr header.i=@c-s.fr header.b=MwaqkRm4; dkim-adsp=pass; dkim-atps=neutral X-Virus-Scanned: Debian amavisd-new at c-s.fr Received: from pegase1.c-s.fr ([192.168.12.234]) by localhost (pegase1.c-s.fr [192.168.12.234]) (amavisd-new, port 10024) with ESMTP id 7KFNCyn7xq7n; Tue, 30 Jul 2019 11:25:52 +0200 (CEST) Received: from messagerie.si.c-s.fr (messagerie.si.c-s.fr [192.168.25.192]) by pegase1.c-s.fr (Postfix) with ESMTP id 45yWPr4N12z9v6rD; Tue, 30 Jul 2019 11:25:52 +0200 (CEST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=c-s.fr; s=mail; t=1564478752; bh=pX9B5rT8fdYyTjZx+y7CWb+oTWSJ3t8UtVUS0M54TGU=; h=Subject:To:Cc:References:From:Date:In-Reply-To:From; b=MwaqkRm4vHR8/sYmxLpOgTAQa18mHrb0VUqrjcNqC1Aaq+35egfN8JkhKEZ3se6ea z03O0PuzFXxwU4G53xz6iNsa6xCJOFcZKbwn3CqgeJI43bVNH3jjSV87cZTbKM9r0o Q8OXsbj1nwj/LypjTYleCuGgV3570gHdIuTUlVUU= Received: from localhost (localhost [127.0.0.1]) by messagerie.si.c-s.fr (Postfix) with ESMTP id B081D8B801; Tue, 30 Jul 2019 11:25:53 +0200 (CEST) X-Virus-Scanned: amavisd-new at c-s.fr Received: from messagerie.si.c-s.fr ([127.0.0.1]) by localhost (messagerie.si.c-s.fr [127.0.0.1]) (amavisd-new, port 10023) with ESMTP id iChTdP8KxfiN; Tue, 30 Jul 2019 11:25:53 +0200 (CEST) Received: from [172.25.230.101] (po15451.idsi0.si.c-s.fr [172.25.230.101]) by messagerie.si.c-s.fr (Postfix) with ESMTP id 7ABBB8B74F; Tue, 30 Jul 2019 11:25:53 +0200 (CEST) Subject: Re: [PATCH v2 03/10] powerpc: introduce kimage_vaddr to store the kernel base To: Jason Yan , mpe@ellerman.id.au, linuxppc-dev@lists.ozlabs.org, diana.craciun@nxp.com, benh@kernel.crashing.org, paulus@samba.org, npiggin@gmail.com, keescook@chromium.org, kernel-hardening@lists.openwall.com Cc: linux-kernel@vger.kernel.org, wangkefeng.wang@huawei.com, yebin10@huawei.com, thunder.leizhen@huawei.com, jingxiangfeng@huawei.com, fanchengyang@huawei.com, zhaohongjiang@huawei.com References: <20190730074225.39544-1-yanaijie@huawei.com> <20190730074225.39544-4-yanaijie@huawei.com> From: Christophe Leroy Message-ID: <8a0c469d-3c69-393b-54ce-a75b8719ca65@c-s.fr> Date: Tue, 30 Jul 2019 11:25:53 +0200 User-Agent: Mozilla/5.0 (Windows NT 6.1; WOW64; rv:60.0) Gecko/20100101 Thunderbird/60.8.0 MIME-Version: 1.0 In-Reply-To: <20190730074225.39544-4-yanaijie@huawei.com> Content-Type: text/plain; charset=utf-8; format=flowed Content-Language: fr Content-Transfer-Encoding: 8bit Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Le 30/07/2019 à 09:42, Jason Yan a écrit : > Now the kernel base is a fixed value - KERNELBASE. To support KASLR, we > need a variable to store the kernel base. > > Signed-off-by: Jason Yan > Cc: Diana Craciun > Cc: Michael Ellerman > Cc: Christophe Leroy > Cc: Benjamin Herrenschmidt > Cc: Paul Mackerras > Cc: Nicholas Piggin > Cc: Kees Cook Reviewed-by: Christophe Leroy > --- > arch/powerpc/include/asm/page.h | 2 ++ > arch/powerpc/mm/init-common.c | 2 ++ > 2 files changed, 4 insertions(+) > > diff --git a/arch/powerpc/include/asm/page.h b/arch/powerpc/include/asm/page.h > index 0d52f57fca04..60a68d3a54b1 100644 > --- a/arch/powerpc/include/asm/page.h > +++ b/arch/powerpc/include/asm/page.h > @@ -315,6 +315,8 @@ void arch_free_page(struct page *page, int order); > > struct vm_area_struct; > > +extern unsigned long kimage_vaddr; > + > #include > #endif /* __ASSEMBLY__ */ > #include > diff --git a/arch/powerpc/mm/init-common.c b/arch/powerpc/mm/init-common.c > index 152ae0d21435..d4801ce48dc5 100644 > --- a/arch/powerpc/mm/init-common.c > +++ b/arch/powerpc/mm/init-common.c > @@ -25,6 +25,8 @@ phys_addr_t memstart_addr = (phys_addr_t)~0ull; > EXPORT_SYMBOL_GPL(memstart_addr); > phys_addr_t kernstart_addr; > EXPORT_SYMBOL_GPL(kernstart_addr); > +unsigned long kimage_vaddr = KERNELBASE; > +EXPORT_SYMBOL_GPL(kimage_vaddr); > > static bool disable_kuep = !IS_ENABLED(CONFIG_PPC_KUEP); > static bool disable_kuap = !IS_ENABLED(CONFIG_PPC_KUAP); >