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 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 smtp.lore.kernel.org (Postfix) with ESMTPS id C70B4C98328 for ; Sat, 26 Sep 2026 09:16:12 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20210309; h=Sender:List-Subscribe:List-Help :List-Post:List-Archive:List-Unsubscribe:List-Id:In-Reply-To:Content-Type: MIME-Version:References:Message-ID:Subject:Cc:To:From:Date:Reply-To: Content-Transfer-Encoding:Content-ID:Content-Description:Resent-Date: Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID:List-Owner; bh=N4bWsh+Pc9s6sIGPF4Grv7BRltIPfKgjNpbCy4AEEXA=; b=s2aD8UnTBAIOd4SWylbY2Mn0UB 115yUjKmax5C7wJsNIaXIZwYRqWTDjJ1f3ulfS2UGH/pdZCwYLQ+fZeachBkqLYj3TM8uZo4dIWB/ gmjwpiAnGg2F4XQGsMvEYxZhn4dJm/+xASouhQFTaX3JtZNnVwgpNHMNjbWXu3dqKuP5gEd0YfkNF LOu4oBuSA2dCO436wB7fRMNMH6sG/Vsluxjo6YqCfAn3jqpxXlMA1X8eDIS1RNiVrOd4ESqSNIz55 s+w9WXAE67d4WlkHXYoS3tlYRlCCIFFiPFzFhInVaWhrxwB4+gYn9G0wWbJzNQBf8tEVMtrzqWDRE KXljUKwQ==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.99.1 #2 (Red Hat Linux)) id 1xAOVq-0000000FBmi-2YTk; Sat, 26 Sep 2026 09:16:06 +0000 Received: from sea.source.kernel.org ([172.234.252.31]) by bombadil.infradead.org with esmtps (Exim 4.99.1 #2 (Red Hat Linux)) id 1xAOVp-0000000FBmW-1ZjX; Sat, 26 Sep 2026 09:16:05 +0000 Received: from smtp.kernel.org (quasi.space.kernel.org [100.103.45.18]) by sea.source.kernel.org (Postfix) with ESMTP id 8459343D1D; Sat, 26 Sep 2026 09:16:03 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 8D6591F000FF; Sat, 26 Sep 2026 09:15:54 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=kernel.org; s=k20260515; t=1790414163; bh=N4bWsh+Pc9s6sIGPF4Grv7BRltIPfKgjNpbCy4AEEXA=; h=Date:From:To:Cc:Subject:References:In-Reply-To; b=i/cy2uAqCW0oNOWoQHl6gMve0xGBebGA1qmqR1XrS9a5R9KjUOKFr6umhqPOwVAfq JV6o+g9ZbwsyFiC1yXxh+8YSz9r3KSw26jRgxGioo81b3ckcBjRXINtVkE5FLLobZm cEXp3py7fiL/jCemhyNfo4o04u6qGas4PLNjGw3xPqVwYER6r75qK1Kpvp2M23DpoY 0BBb6c0Da8U0FS8/BGW5K1g9Jfq3Q/44IR7oFF8xFbzjaFcMlW6oTmaVRUNooMJemG 74S09dqAtiFGHl507QSUC4HwsG7rqGMANSDx0f//8KLgYHgnF7DXbYK/029YJkc1x3 aMwcgwNgXEt7w== Date: Sat, 26 Sep 2026 10:15:51 +0100 From: "Lorenzo Stoakes (ARM)" To: "David Hildenbrand (Arm)" Cc: "Mike Rapoport (Microsoft)" , Andrew Morton , Albert Ou , Alexander Gordeev , Alexandre Ghiti , Borislav Petkov , Catalin Marinas , "Christophe Leroy (CS GROUP)" , Christian Borntraeger , Dave Hansen , Gerald Schaefer , Heiko Carstens , Ingo Molnar , "Liam R. Howlett" , Madhavan Srinivasan , Mark Rutland , Michael Ellerman , Michal Hocko , Nicholas Piggin , Palmer Dabbelt , Paul Walmsley , "H. Peter Anvin" , Ritesh Harjani , Russell King , Shrikanth Hegde , Suren Baghdasaryan , Sven Schnelle , Thomas Gleixner , Vasily Gorbik , Vlastimil Babka , Will Deacon , linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org, linux-mm@kvack.org, linuxppc-dev@lists.ozlabs.org, linux-riscv@lists.infradead.org, linux-s390@vger.kernel.org Subject: Re: [PATCH] arch, mm: promote DEBUG_WX to CHECK_WX Message-ID: References: <20260925-direct-map-verify-wx-v1-1-7fd2f7d6d23b@kernel.org> <91d800d6-03f3-4068-8c12-618529a81528@kernel.org> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <91d800d6-03f3-4068-8c12-618529a81528@kernel.org> X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org On Fri, Sep 25, 2026 at 01:01:51PM +0200, David Hildenbrand (Arm) wrote: > On 9/25/26 11:53, Mike Rapoport (Microsoft) wrote: > > Verification that the kernel does not have writable + executable > > mappings is about detecting security risks rather than a pure debug > > feature. > > > > Major distribution configurations enable it in their kernels as well as > > defconfigs of most architectures that have ARCH_HAS_DEBUG_WX. > > > > Rename relevant generic configuration options to use CHECK_WX and move > > their definitions from mm/Kconfig.debug to mm/Kconfig. > > > > For arm that does not widely enable it, only rename its variants of the > > config options. > > > > Enabling CHECK_WX adds a few kilobytes to the kernel binary and while > > the added size can be slightly reduced with churny updates of > > architecture implementations of ptdump, the core functionality takes > > most of the added size. It cannot be moved to .init.text because the > > verification has to happen after init sections are freed. > > > > With this, make generic CHECK_WX default to STRICT_KERNEL_RWX while > > still leaving users targeting small kernels the possibility to opt-out. > > > > Suggested-by: Dave Hansen > > Signed-off-by: Mike Rapoport (Microsoft) > > --- > > Makes sense to me > > Acked-by: David Hildenbrand (Arm) Similarly LGTM so: Acked-by: Lorenzo Stoakes (ARM) > > -- > Cheers, > > David -- Cheers, Lorenzo