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=-9.8 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_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 662E5C49ED7 for ; Fri, 20 Sep 2019 09:26:08 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 480EE208C3 for ; Fri, 20 Sep 2019 09:26:08 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S2408560AbfITJ0H (ORCPT ); Fri, 20 Sep 2019 05:26:07 -0400 Received: from szxga06-in.huawei.com ([45.249.212.32]:55850 "EHLO huawei.com" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S2408503AbfITJZf (ORCPT ); Fri, 20 Sep 2019 05:25:35 -0400 Received: from DGGEMS406-HUB.china.huawei.com (unknown [172.30.72.59]) by Forcepoint Email with ESMTP id 8CF3B624368C4D3EB17C; Fri, 20 Sep 2019 17:25:34 +0800 (CST) Received: from huawei.com (10.175.124.28) by DGGEMS406-HUB.china.huawei.com (10.3.19.206) with Microsoft SMTP Server id 14.3.439.0; Fri, 20 Sep 2019 17:25:24 +0800 From: Jason Yan To: , , , , , , , , CC: , , , , , , , Jason Yan Subject: [PATCH v7 09/12] powerpc/fsl_booke/kaslr: support nokaslr cmdline parameter Date: Fri, 20 Sep 2019 17:45:43 +0800 Message-ID: <20190920094546.44948-10-yanaijie@huawei.com> X-Mailer: git-send-email 2.17.2 In-Reply-To: <20190920094546.44948-1-yanaijie@huawei.com> References: <20190920094546.44948-1-yanaijie@huawei.com> MIME-Version: 1.0 Content-Type: text/plain X-Originating-IP: [10.175.124.28] X-CFilter-Loop: Reflected Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org One may want to disable kaslr when boot, so provide a cmdline parameter 'nokaslr' to support this. 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: Diana Craciun Tested-by: Diana Craciun Reviewed-by: Christophe Leroy --- arch/powerpc/mm/nohash/kaslr_booke.c | 7 +++++++ 1 file changed, 7 insertions(+) diff --git a/arch/powerpc/mm/nohash/kaslr_booke.c b/arch/powerpc/mm/nohash/kaslr_booke.c index aa1b60c782e7..4a75f2d9bf0e 100644 --- a/arch/powerpc/mm/nohash/kaslr_booke.c +++ b/arch/powerpc/mm/nohash/kaslr_booke.c @@ -281,6 +281,11 @@ static unsigned long __init kaslr_legal_offset(void *dt_ptr, unsigned long index return koffset; } +static inline __init bool kaslr_disabled(void) +{ + return strstr(boot_command_line, "nokaslr") != NULL; +} + static unsigned long __init kaslr_choose_location(void *dt_ptr, phys_addr_t size, unsigned long kernel_sz) { @@ -290,6 +295,8 @@ static unsigned long __init kaslr_choose_location(void *dt_ptr, phys_addr_t size unsigned long index; kaslr_get_cmdline(dt_ptr); + if (kaslr_disabled()) + return 0; random = get_boot_seed(dt_ptr); -- 2.17.2