Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1753382AbdLHLNb (ORCPT ); Fri, 8 Dec 2017 06:13:31 -0500 Received: from mail-pg0-f68.google.com ([74.125.83.68]:44846 "EHLO mail-pg0-f68.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753236AbdLHLN1 (ORCPT ); Fri, 8 Dec 2017 06:13:27 -0500 X-Google-Smtp-Source: AGs4zMZSTiFfMxvhbUNKODOj8We0rRBWA7PD8rYbrkt405Xf3tm5Yr7g4M9EDcTcgN2B8sVflLjPhQ== Date: Fri, 8 Dec 2017 20:13:18 +0900 From: Jinbum Park To: linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org, kernel-hardening@lists.openwall.com Cc: linux@armlinux.org.uk, gregkh@linuxfoundation.org, tglx@linutronix.de, kstewart@linuxfoundation.org, mingo@kernel.org, pombredanne@nexb.com Subject: [kernel-hardening][PATCH] arm: mm: idmap: Mark variables as ro_after_init Message-ID: <20171208111318.GA12346@pjb1027-Latitude-E5410> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline User-Agent: Mutt/1.5.21 (2010-09-15) Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 789 Lines: 26 idmap_pgd, arch_phys_to_idmap_offset are setup once while init stage, and never changed after that. so, it is good candidate for __ro_after_init. Signed-off-by: Jinbum Park --- arch/arm/mm/idmap.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) diff --git a/arch/arm/mm/idmap.c b/arch/arm/mm/idmap.c index 10bfba8..1d1edd0 100644 --- a/arch/arm/mm/idmap.c +++ b/arch/arm/mm/idmap.c @@ -16,8 +16,8 @@ * are not supported on any CPU using the idmap tables as its current * page tables. */ -pgd_t *idmap_pgd; -long long arch_phys_to_idmap_offset; +pgd_t *idmap_pgd __ro_after_init; +long long arch_phys_to_idmap_offset __ro_after_init; #ifdef CONFIG_ARM_LPAE static void idmap_add_pmd(pud_t *pud, unsigned long addr, unsigned long end, -- 1.9.1