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, 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 9FA34C3F2C6 for ; Sun, 1 Mar 2020 00:22:14 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 7BB3320828 for ; Sun, 1 Mar 2020 00:22:14 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727237AbgCAAWN (ORCPT ); Sat, 29 Feb 2020 19:22:13 -0500 Received: from mail-qt1-f193.google.com ([209.85.160.193]:44643 "EHLO mail-qt1-f193.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1727131AbgCAAWN (ORCPT ); Sat, 29 Feb 2020 19:22:13 -0500 Received: by mail-qt1-f193.google.com with SMTP id j23so4904234qtr.11 for ; Sat, 29 Feb 2020 16:22:10 -0800 (PST) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:from:to:cc:subject:date:message-id:in-reply-to :references:mime-version:content-transfer-encoding; bh=qshFldRB8YPASr29CwNccF5JOuFD0I3kQPBmVUj9i3E=; b=GWVGiA1NOcOTxW2B5WjKk53IeP6t6HfEgRjgHUclHwO+ZfsJ008R0aBBZ5uWd9RCmZ 0Jy7wnJLCakuIZu/P//HMBcN8ft05K80RbGN0yAwZk18FUVY8Wvakvcl7rnXu9DnNzyC g8fIhhXlwtqDRwEvy1ffs7kpPTLE3bnsbifotChBEY5cCsw3TRfFFN7NFN2jQUxgm362 qc0dzJu4fdKBaeldCL3M7bk3nzkyHCBJ3rxniivNOewMHKpqiRss6C2qfAi+0pCPYuW7 RZdo/VtNpM2ROyK/4/j8gU7GMBzH8oM/0z5nbYiDEMCbvO4B/lkOzEslSYA7QpgTSN1/ 0xkQ== X-Gm-Message-State: APjAAAVj7Wz/2TNhsjSWeqSRMV34b1Woq3XuLG/ZlqcqGA4y2vWkjBYx ZZy318IfWdB+rWtxVF4TMCqMW4eL7M0= X-Google-Smtp-Source: APXvYqy3Vwc9teClEAbXOadl2PZOUAAd2uQthzN2aseTpywQ2ge+HlEu+sb5gkYPpSps4VMPEx1Yog== X-Received: by 2002:aed:218f:: with SMTP id l15mr9944317qtc.247.1583022130405; Sat, 29 Feb 2020 16:22:10 -0800 (PST) Received: from rani.riverdale.lan ([2001:470:1f07:5f3::b55f]) by smtp.gmail.com with ESMTPSA id p16sm7602951qkp.12.2020.02.29.16.22.09 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Sat, 29 Feb 2020 16:22:10 -0800 (PST) From: Arvind Sankar To: "Tobin C . Harding" , Tycho Andersen Cc: kernel-hardening@lists.openwall.com, Kees Cook , Dave Hansen , Andy Lutomirski , Peter Zijlstra , x86@kernel.org, linux-kernel@vger.kernel.org Subject: [PATCH v2] x86/mm/init_32: Stop printing the virtual memory layout Date: Sat, 29 Feb 2020 19:22:09 -0500 Message-Id: <20200301002209.1304982-1-nivedita@alum.mit.edu> X-Mailer: git-send-email 2.24.1 In-Reply-To: <202002291534.ED372CC@keescook> References: <202002291534.ED372CC@keescook> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org For security, don't display the kernel's virtual memory layout. Signed-off-by: Arvind Sankar --- arch/x86/mm/init_32.c | 38 -------------------------------------- 1 file changed, 38 deletions(-) diff --git a/arch/x86/mm/init_32.c b/arch/x86/mm/init_32.c index 23df4885bbed..8ae0272c1c51 100644 --- a/arch/x86/mm/init_32.c +++ b/arch/x86/mm/init_32.c @@ -788,44 +788,6 @@ void __init mem_init(void) x86_init.hyper.init_after_bootmem(); mem_init_print_info(NULL); - printk(KERN_INFO "virtual kernel memory layout:\n" - " fixmap : 0x%08lx - 0x%08lx (%4ld kB)\n" - " cpu_entry : 0x%08lx - 0x%08lx (%4ld kB)\n" -#ifdef CONFIG_HIGHMEM - " pkmap : 0x%08lx - 0x%08lx (%4ld kB)\n" -#endif - " vmalloc : 0x%08lx - 0x%08lx (%4ld MB)\n" - " lowmem : 0x%08lx - 0x%08lx (%4ld MB)\n" - " .init : 0x%08lx - 0x%08lx (%4ld kB)\n" - " .data : 0x%08lx - 0x%08lx (%4ld kB)\n" - " .text : 0x%08lx - 0x%08lx (%4ld kB)\n", - FIXADDR_START, FIXADDR_TOP, - (FIXADDR_TOP - FIXADDR_START) >> 10, - - CPU_ENTRY_AREA_BASE, - CPU_ENTRY_AREA_BASE + CPU_ENTRY_AREA_MAP_SIZE, - CPU_ENTRY_AREA_MAP_SIZE >> 10, - -#ifdef CONFIG_HIGHMEM - PKMAP_BASE, PKMAP_BASE+LAST_PKMAP*PAGE_SIZE, - (LAST_PKMAP*PAGE_SIZE) >> 10, -#endif - - VMALLOC_START, VMALLOC_END, - (VMALLOC_END - VMALLOC_START) >> 20, - - (unsigned long)__va(0), (unsigned long)high_memory, - ((unsigned long)high_memory - (unsigned long)__va(0)) >> 20, - - (unsigned long)&__init_begin, (unsigned long)&__init_end, - ((unsigned long)&__init_end - - (unsigned long)&__init_begin) >> 10, - - (unsigned long)&_etext, (unsigned long)&_edata, - ((unsigned long)&_edata - (unsigned long)&_etext) >> 10, - - (unsigned long)&_text, (unsigned long)&_etext, - ((unsigned long)&_etext - (unsigned long)&_text) >> 10); /* * Check boundaries twice: Some fundamental inconsistencies can -- 2.24.1