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=-8.2 required=3.0 tests=HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_PATCH,MAILING_LIST_MULTI,SIGNED_OFF_BY,SPF_HELO_NONE,SPF_PASS, URIBL_BLOCKED,USER_AGENT_SANE_2 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 26D53C3F2CE for ; Wed, 4 Mar 2020 21:53:27 +0000 (UTC) Received: from mother.openwall.net (mother.openwall.net [195.42.179.200]) by mail.kernel.org (Postfix) with SMTP id 7EBFF20732 for ; Wed, 4 Mar 2020 21:53:26 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 7EBFF20732 Authentication-Results: mail.kernel.org; dmarc=none (p=none dis=none) header.from=buserror.net Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=kernel-hardening-return-18066-kernel-hardening=archiver.kernel.org@lists.openwall.com Received: (qmail 26192 invoked by uid 550); 4 Mar 2020 21:53:20 -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 26160 invoked from network); 4 Mar 2020 21:53:19 -0000 Message-ID: <5737c82b1ab4c80e53904e4846694884ca429569.camel@buserror.net> From: Scott Wood To: Jason Yan , mpe@ellerman.id.au, linuxppc-dev@lists.ozlabs.org, diana.craciun@nxp.com, christophe.leroy@c-s.fr, benh@kernel.crashing.org, paulus@samba.org, npiggin@gmail.com, keescook@chromium.org, kernel-hardening@lists.openwall.com Cc: linux-kernel@vger.kernel.org, zhaohongjiang@huawei.com Date: Wed, 04 Mar 2020 15:53:01 -0600 In-Reply-To: <20200206025825.22934-6-yanaijie@huawei.com> References: <20200206025825.22934-1-yanaijie@huawei.com> <20200206025825.22934-6-yanaijie@huawei.com> Organization: Red Hat Content-Type: text/plain; charset="UTF-8" X-Mailer: Evolution 3.28.5-0ubuntu0.18.04.1 Mime-Version: 1.0 Content-Transfer-Encoding: 7bit X-SA-Exim-Connect-IP: 2601:449:8480:af0:12bf:48ff:fe84:c9a0 X-SA-Exim-Rcpt-To: yanaijie@huawei.com, mpe@ellerman.id.au, linuxppc-dev@lists.ozlabs.org, diana.craciun@nxp.com, christophe.leroy@c-s.fr, benh@kernel.crashing.org, paulus@samba.org, npiggin@gmail.com, keescook@chromium.org, kernel-hardening@lists.openwall.com, linux-kernel@vger.kernel.org, zhaohongjiang@huawei.com X-SA-Exim-Mail-From: oss@buserror.net Subject: Re: [PATCH v3 5/6] powerpc/fsl_booke/64: clear the original kernel if randomized X-SA-Exim-Version: 4.2.1 (built Tue, 02 Aug 2016 21:08:31 +0000) X-SA-Exim-Scanned: Yes (on baldur.buserror.net) On Thu, 2020-02-06 at 10:58 +0800, Jason Yan wrote: > The original kernel still exists in the memory, clear it now. > > Signed-off-by: Jason Yan > Cc: Scott Wood > Cc: Diana Craciun > Cc: Michael Ellerman > Cc: Christophe Leroy > Cc: Benjamin Herrenschmidt > Cc: Paul Mackerras > Cc: Nicholas Piggin > Cc: Kees Cook > --- > arch/powerpc/mm/nohash/kaslr_booke.c | 4 +++- > 1 file changed, 3 insertions(+), 1 deletion(-) > > diff --git a/arch/powerpc/mm/nohash/kaslr_booke.c > b/arch/powerpc/mm/nohash/kaslr_booke.c > index c6f5c1db1394..ed1277059368 100644 > --- a/arch/powerpc/mm/nohash/kaslr_booke.c > +++ b/arch/powerpc/mm/nohash/kaslr_booke.c > @@ -378,8 +378,10 @@ notrace void __init kaslr_early_init(void *dt_ptr, > phys_addr_t size) > unsigned int *__kaslr_offset = (unsigned int *)(KERNELBASE + 0x58); > unsigned int *__run_at_load = (unsigned int *)(KERNELBASE + 0x5c); > > - if (*__run_at_load == 1) > + if (*__run_at_load == 1) { > + kaslr_late_init(); > return; > + } What if you're here because kexec set __run_at_load (or CONFIG_RELOCATABLE_TEST is enabled), not because kaslr happened? -Scott