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 1B340C3F2C6 for ; Sat, 29 Feb 2020 23:11:38 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id EFCE024672 for ; Sat, 29 Feb 2020 23:11:37 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727520AbgB2XLY (ORCPT ); Sat, 29 Feb 2020 18:11:24 -0500 Received: from mail-qk1-f194.google.com ([209.85.222.194]:39265 "EHLO mail-qk1-f194.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726786AbgB2XLY (ORCPT ); Sat, 29 Feb 2020 18:11:24 -0500 Received: by mail-qk1-f194.google.com with SMTP id e16so6680077qkl.6 for ; Sat, 29 Feb 2020 15:11:21 -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:mime-version :content-transfer-encoding; bh=T5ZPrIWUcFdZz+VY7vEnX2GwkgxMVshMmglqEI63Hd0=; b=OfEhwIp2aEf74LXz0/vdWIhFbllJJsJX+MqH8i7jEkHx7XNH5G16bvty+PoCLOq2l/ nAla9HuLJbgYSupCz/O4nekjpJkITWzeOAeIe9pSUZBR6lRRF2iXSw5+RcxxkCTrSxqT o8AfjVTq9AoaPI1IJ5/0uGVj/cCGCZhATxCr3jSQ7SqPsffYiPziHCtEhD96d4gmh+Jl Qq29jArCX01E7wJJYE442Lz51z0yKe7ZjHjCjxpd8LrsMhFWvbsbsYxeVrneLV1Fey0M C4qg8B5Z2B8U2Mc3f5gOyj8oaF6ssFlMsfOinrLauUzY7aJcLNbb9MVy5P4c1fsqgnFE T0xg== X-Gm-Message-State: APjAAAUcJlgJPMlHTsZkBtjBTJgvlWWYm3Ya0Aou6ZIT9UOFX33CbDAT InUMdtcuBy8DppzmogEaQBY= X-Google-Smtp-Source: APXvYqzJ+SJfesoEXBu07OvOjzBqsP/jFC5ZXJWFZcSGrzC5jVvdiMCeSRFshxY0nR3wLP/Z04f2Wg== X-Received: by 2002:a05:620a:146c:: with SMTP id j12mr10863660qkl.373.1583017881241; Sat, 29 Feb 2020 15:11:21 -0800 (PST) Received: from rani.riverdale.lan ([2001:470:1f07:5f3::b55f]) by smtp.gmail.com with ESMTPSA id z6sm7588644qto.86.2020.02.29.15.11.20 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Sat, 29 Feb 2020 15:11:20 -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] x86/mm/init: Stop printing pgt_buf addresses Date: Sat, 29 Feb 2020 18:11:20 -0500 Message-Id: <20200229231120.1147527-1-nivedita@alum.mit.edu> X-Mailer: git-send-email 2.24.1 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 This currently leaks kernel physical addresses into userspace. Signed-off-by: Arvind Sankar --- arch/x86/mm/init.c | 2 -- 1 file changed, 2 deletions(-) diff --git a/arch/x86/mm/init.c b/arch/x86/mm/init.c index e7bb483557c9..dc4711f09cdc 100644 --- a/arch/x86/mm/init.c +++ b/arch/x86/mm/init.c @@ -121,8 +121,6 @@ __ref void *alloc_low_pages(unsigned int num) } else { pfn = pgt_buf_end; pgt_buf_end += num; - printk(KERN_DEBUG "BRK [%#010lx, %#010lx] PGTABLE\n", - pfn << PAGE_SHIFT, (pgt_buf_end << PAGE_SHIFT) - 1); } for (i = 0; i < num; i++) { -- 2.24.1