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=-8.5 required=3.0 tests=DKIMWL_WL_HIGH,DKIM_SIGNED, DKIM_VALID,INCLUDES_PATCH,MAILING_LIST_MULTI,SIGNED_OFF_BY,SPF_HELO_NONE, SPF_PASS,URIBL_BLOCKED,USER_AGENT_SANE_1 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 9F85DC54FD0 for ; Mon, 27 Apr 2020 07:49:38 +0000 (UTC) Received: from bombadil.infradead.org (bombadil.infradead.org [198.137.202.133]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPS id 71C2720728 for ; Mon, 27 Apr 2020 07:49:38 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=lists.infradead.org header.i=@lists.infradead.org header.b="VriHjqlP"; dkim=fail reason="signature verification failed" (1024-bit key) header.d=kernel.org header.i=@kernel.org header.b="tM0MCyqE" DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 71C2720728 Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=kernel.org Authentication-Results: mail.kernel.org; spf=none smtp.mailfrom=linux-arm-kernel-bounces+infradead-linux-arm-kernel=archiver.kernel.org@lists.infradead.org DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20170209; h=Sender: Content-Transfer-Encoding:Content-Type:Cc:List-Subscribe:List-Help:List-Post: List-Archive:List-Unsubscribe:List-Id:In-Reply-To:MIME-Version:References: Message-ID:Subject:To:From:Date:Reply-To:Content-ID:Content-Description: Resent-Date:Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID: List-Owner; bh=frHkJN4RHlZ0Hay1rO/+9xvtxQA3n3YbuIdd+n0+lCA=; b=VriHjqlPi9N+T4 /sBBeiITxUX5r79lN8AUJL+9VOb6kQeI0lVycZo/1VbPjZu9fDMFRRavyi8xhYozgW+48jw9C/ETM gdFZtnESyZr4V5uQw06Lex0Lnvpvh4g8uqvx6GZ59wevHtMWXJwzae2F9eJN4bhaoXmC90qtyONtl PuA++NOKLRt/A2Khmggso4grH2QVmlRGx+mvk62rFYCwBZfi5Yyai4eucUVrG35fqjOWspiycXlHl fEWm5SuwRmVP2Jm592S67dtbls9jMlym4ysaUJ8vY+OoaknoVWJySt6u9gqHtczdriOKyiLKogglI FBEWJ4X35pj4ulLU9h3Q==; Received: from localhost ([127.0.0.1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.92.3 #3 (Red Hat Linux)) id 1jSyWI-0004CH-3m; Mon, 27 Apr 2020 07:49:38 +0000 Received: from mail.kernel.org ([198.145.29.99]) by bombadil.infradead.org with esmtps (Exim 4.92.3 #3 (Red Hat Linux)) id 1jSyW2-0003zq-Eh; Mon, 27 Apr 2020 07:49:36 +0000 Received: from willie-the-truck (236.31.169.217.in-addr.arpa [217.169.31.236]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPSA id 8EC0B20728; Mon, 27 Apr 2020 07:49:19 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1587973761; bh=gUEF4e+I+5LtkJ+KR7VccemOQ0DrTjrOVZmMSY/BJKo=; h=Date:From:To:Cc:Subject:References:In-Reply-To:From; b=tM0MCyqEbiKAHZFfSbvrulUKGmf63KAanMfop+yxY/F6lhWkM0zaQHm6rQTTcpbFO HOLa2VqGqzrsyLsi9beTUDK/YUbfTbFXhIaq0lXicUQ2nltnRNrmYVf2nEyZ5hYtxm L4qNVWY1RZq3IAt1JnQvY/wDdHSjRRAJ1cpgYvGY= Date: Mon, 27 Apr 2020 08:49:16 +0100 From: Will Deacon To: Zong Li Subject: Re: [PATCH 1/4] mm: add DEBUG_WX support Message-ID: <20200427074915.GA11787@willie-the-truck> References: <23980cd0f0e5d79e24a92169116407c75bcc650d.1587455584.git.zong.li@sifive.com> MIME-Version: 1.0 Content-Disposition: inline In-Reply-To: <23980cd0f0e5d79e24a92169116407c75bcc650d.1587455584.git.zong.li@sifive.com> User-Agent: Mutt/1.10.1 (2018-07-13) X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20200427_004930_770812_2100EB41 X-CRM114-Status: GOOD ( 17.08 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: tglx@linutronix.de, catalin.marinas@arm.com, x86@kernel.org, linux-kernel@vger.kernel.org, linux-mm@kvack.org, mingo@redhat.com, palmer@dabbelt.com, paul.walmsley@sifive.com, bp@alien8.de, akpm@linux-foundation.org, hpa@zytor.com, linux-riscv@lists.infradead.org, linux-arm-kernel@lists.infradead.org Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+infradead-linux-arm-kernel=archiver.kernel.org@lists.infradead.org On Tue, Apr 21, 2020 at 04:17:12PM +0800, Zong Li wrote: > Some architectures support DEBUG_WX function, it's verbatim from each > others. Extract to mm/Kconfig.debug for shared use. > > Signed-off-by: Zong Li > Suggested-by: Palmer Dabbelt > --- > mm/Kconfig.debug | 33 +++++++++++++++++++++++++++++++++ > 1 file changed, 33 insertions(+) > > diff --git a/mm/Kconfig.debug b/mm/Kconfig.debug > index 0271b22e063f..077458ad968d 100644 > --- a/mm/Kconfig.debug > +++ b/mm/Kconfig.debug > @@ -118,6 +118,39 @@ config DEBUG_RODATA_TEST > ---help--- > This option enables a testcase for the setting rodata read-only. > > +config ARCH_HAS_DEBUG_WX > + bool > + > +config DEBUG_WX > + bool "Warn on W+X mappings at boot" > + depends on ARCH_HAS_DEBUG_WX > + select PTDUMP_CORE > + help > + Generate a warning if any W+X mappings are found at boot. > + > + This is useful for discovering cases where the kernel is leaving > + W+X mappings after applying NX, as such mappings are a security risk. > + This check also includes UXN, which should be set on all kernel > + mappings. "UXN" is the name of a bit in the arm64 page-table descriptors, so this should be reworded now that it's in generic help text. Will _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel