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=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 74588C7618B for ; Mon, 29 Jul 2019 11:00:47 +0000 (UTC) Received: from mother.openwall.net (mother.openwall.net [195.42.179.200]) by mail.kernel.org (Postfix) with SMTP id C7886214AE for ; Mon, 29 Jul 2019 11:00:46 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (1024-bit key) header.d=c-s.fr header.i=@c-s.fr header.b="u7VDIQYA" DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org C7886214AE Authentication-Results: mail.kernel.org; dmarc=none (p=none dis=none) header.from=c-s.fr Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=kernel-hardening-return-16602-kernel-hardening=archiver.kernel.org@lists.openwall.com Received: (qmail 31884 invoked by uid 550); 29 Jul 2019 11:00:40 -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 31852 invoked from network); 29 Jul 2019 11:00:40 -0000 Authentication-Results: localhost; dkim=pass reason="1024-bit key; insecure key" header.d=c-s.fr header.i=@c-s.fr header.b=u7VDIQYA; dkim-adsp=pass; dkim-atps=neutral X-Virus-Scanned: Debian amavisd-new at c-s.fr DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=c-s.fr; s=mail; t=1564398023; bh=bemZgr0O0YrWgKD72zZXmB/7NTM9japGIRAflRk9J3A=; h=Subject:To:Cc:References:From:Date:In-Reply-To:From; b=u7VDIQYA8o5UGKYO+VADrupn8fkwbIncGUiSYVgqZetFSCre7dB7HBsrZuFrBSSXJ hEVH+GyB2Ex/kH70U/XHnti4QmZAftHkPgh+X+phSbtYs6gpF10rBt/CPPTYCE96wR f7kipDJ2s7j6IUcjaXGPf+bjw38FpZ/onKdv4bUg= X-Virus-Scanned: amavisd-new at c-s.fr Subject: Re: [RFC PATCH 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 References: <20190717080621.40424-1-yanaijie@huawei.com> <20190717080621.40424-4-yanaijie@huawei.com> From: Christophe Leroy Message-ID: <7e19ade3-cb1a-a633-aa2d-ef5f182ba80c@c-s.fr> Date: Mon, 29 Jul 2019 13:00:28 +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: <20190717080621.40424-4-yanaijie@huawei.com> Content-Type: text/plain; charset=utf-8; format=flowed Content-Language: fr Content-Transfer-Encoding: 8bit Le 17/07/2019 à 10:06, 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 9273c38009cb..c7a98c73e5c1 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(memstart_addr); > phys_addr_t kernstart_addr; > EXPORT_SYMBOL(kernstart_addr); > +unsigned long kimage_vaddr = KERNELBASE; > +EXPORT_SYMBOL(kimage_vaddr); > > static bool disable_kuep = !IS_ENABLED(CONFIG_PPC_KUEP); > static bool disable_kuap = !IS_ENABLED(CONFIG_PPC_KUAP); >