From patchwork Sat May 6 04:07:37 2017 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Greg KH X-Patchwork-Id: 9714539 Return-Path: Received: from mail.wl.linuxfoundation.org (pdx-wl-mail.web.codeaurora.org [172.30.200.125]) by pdx-korg-patchwork.web.codeaurora.org (Postfix) with ESMTP id E3DB160234 for ; Sat, 6 May 2017 04:08:01 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id D6EB4281B7 for ; Sat, 6 May 2017 04:08:01 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id CB3CA28678; Sat, 6 May 2017 04:08:01 +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=-4.2 required=2.0 tests=BAYES_00, 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 EE0CF281B7 for ; Sat, 6 May 2017 04:08:00 +0000 (UTC) Received: (qmail 26255 invoked by uid 550); 6 May 2017 04:07:59 -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 26223 invoked from network); 6 May 2017 04:07:57 -0000 Date: Fri, 5 May 2017 21:07:37 -0700 From: Greg KH To: kernel-hardening@lists.openwall.com, Petr Mladek , Sergey Senozhatsky Cc: linux-kernel@vger.kernel.org, Catalin Marinas , Will Deacon , Steven Rostedt , William Roberts , Chris Fries , Dave Weinstein Message-ID: <20170506040737.GE32707@kroah.com> References: <20170506040641.GA32707@kroah.com> MIME-Version: 1.0 Content-Disposition: inline In-Reply-To: <20170506040641.GA32707@kroah.com> User-Agent: Mutt/1.8.2 (2017-04-18) Subject: [kernel-hardening] [RFC 4/6] lib: vsprintf: default kptr_restrict to the maximum value X-Virus-Scanned: ClamAV using ClamSMTP From: Dave Weinstein Set the initial value of kptr_restrict to the maximum setting rather than the minimum setting, to ensure that early boot logging is not leaking information. Cc: William Roberts Cc: Chris Fries Signed-off-by: Dave Weinstein Signed-off-by: Greg Kroah-Hartman --- lib/vsprintf.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/lib/vsprintf.c b/lib/vsprintf.c index 75a49795fcae..404d477d4bd2 100644 --- a/lib/vsprintf.c +++ b/lib/vsprintf.c @@ -395,7 +395,7 @@ struct printf_spec { #define FIELD_WIDTH_MAX ((1 << 23) - 1) #define PRECISION_MAX ((1 << 15) - 1) -int kptr_restrict __read_mostly; +int kptr_restrict __read_mostly = 4; /* * Always cleanse %p and %pK specifiers