From patchwork Wed Jul 17 08:06:20 2019 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Jason Yan X-Patchwork-Id: 11047395 Return-Path: Received: from mail.wl.linuxfoundation.org (pdx-wl-mail.web.codeaurora.org [172.30.200.125]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id 8698B13BD for ; Wed, 17 Jul 2019 07:50:54 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 7ACA1285A4 for ; Wed, 17 Jul 2019 07:50:54 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id 6E07F28608; Wed, 17 Jul 2019 07:50:54 +0000 (UTC) X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on pdx-wl-mail.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-5.2 required=2.0 tests=BAYES_00,MAILING_LIST_MULTI, RCVD_IN_DNSWL_MED autolearn=ham version=3.3.1 Received: from mother.openwall.net (mother.openwall.net [195.42.179.200]) by mail.wl.linuxfoundation.org (Postfix) with SMTP id 8E397285A4 for ; Wed, 17 Jul 2019 07:50:53 +0000 (UTC) Received: (qmail 1180 invoked by uid 550); 17 Jul 2019 07:49:41 -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: Delivered-To: mailing list kernel-hardening@lists.openwall.com Received: (qmail 32558 invoked from network); 17 Jul 2019 07:49:36 -0000 From: Jason Yan To: , , , , , , , , CC: , , , , , , Jason Yan Subject: [RFC PATCH 09/10] powerpc/fsl_booke/kaslr: support nokaslr cmdline parameter Date: Wed, 17 Jul 2019 16:06:20 +0800 Message-ID: <20190717080621.40424-10-yanaijie@huawei.com> X-Mailer: git-send-email 2.17.2 In-Reply-To: <20190717080621.40424-1-yanaijie@huawei.com> References: <20190717080621.40424-1-yanaijie@huawei.com> MIME-Version: 1.0 X-Originating-IP: [10.175.124.28] X-CFilter-Loop: Reflected X-Virus-Scanned: ClamAV using ClamSMTP 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 --- arch/powerpc/kernel/kaslr_booke.c | 14 ++++++++++++++ 1 file changed, 14 insertions(+) diff --git a/arch/powerpc/kernel/kaslr_booke.c b/arch/powerpc/kernel/kaslr_booke.c index 00339c05879f..e65a5d9d2ff1 100644 --- a/arch/powerpc/kernel/kaslr_booke.c +++ b/arch/powerpc/kernel/kaslr_booke.c @@ -373,6 +373,18 @@ static unsigned long __init kaslr_choose_location(void *dt_ptr, phys_addr_t size return kaslr_offset; } +static inline __init bool kaslr_disabled(void) +{ + char *str; + + str = strstr(early_command_line, "nokaslr"); + if ((str == early_command_line) || + (str > early_command_line && *(str - 1) == ' ')) + return true; + + return false; +} + /* * To see if we need to relocate the kernel to a random offset * void *dt_ptr - address of the device tree @@ -388,6 +400,8 @@ notrace void __init kaslr_early_init(void *dt_ptr, phys_addr_t size) kernel_sz = (unsigned long)_end - KERNELBASE; kaslr_get_cmdline(dt_ptr); + if (kaslr_disabled()) + return; offset = kaslr_choose_location(dt_ptr, size, kernel_sz);