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 11314C43458 for ; Tue, 14 Jul 2026 09:47:45 +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:Message-Id:Date:References: In-Reply-To:Cc:To:From:Subject:Content-Transfer-Encoding:Content-Type: MIME-Version:Reply-To:Content-ID:Content-Description:Resent-Date:Resent-From: Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID:List-Owner; bh=3cRD5tp61vGr5S2DsLizm6q3lmn7Tl+FjuVbnFjpaWY=; b=OO/nYyC+3KVLAkq0eK8nDNkDBm tgZPVZl+E18q7AmyCTkyige6ZH9dC9M0tZTyGJCL6+h1H1SKVnR9Hop9p0fd0J+P1Rvb9Mu0eWmL3 v2O7zOfMELjnDl5YollFOkUQzHmMSQjZo/DhqbVEPTrCMfzFfw/5OuUsD0rruX/KnLmANPsWUg/0o nkIB+yvFdsvLRaUM4lPOuc2BjskgJ7cDVL45hsKCG8YT4xBXyoTYsqdVlUIK2oCmuun1sgaPOL+op Hb+EU8eYJ5h2Mu+1x5oTlKJSz9b/VBW8AT8hOfKZarIU9LhdW6BPFPP0JZvGX5IjXHCz9xtDD+0No Bo2b0ACA==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.99.1 #2 (Red Hat Linux)) id 1wjZjm-0000000BUd9-3OSN; Tue, 14 Jul 2026 09:47:38 +0000 Received: from sea.source.kernel.org ([2600:3c0a:e001:78e:0:1991:8:25]) by bombadil.infradead.org with esmtps (Exim 4.99.1 #2 (Red Hat Linux)) id 1wjZjl-0000000BUcl-09tu for linux-arm-kernel@lists.infradead.org; Tue, 14 Jul 2026 09:47:37 +0000 Received: from smtp.kernel.org (quasi.space.kernel.org [100.103.45.18]) by sea.source.kernel.org (Postfix) with ESMTP id 5EC3543896; Tue, 14 Jul 2026 09:47:36 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id D44AC1F000E9; Tue, 14 Jul 2026 09:47:29 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=kernel.org; s=k20260515; t=1784022456; bh=3cRD5tp61vGr5S2DsLizm6q3lmn7Tl+FjuVbnFjpaWY=; h=Subject:From:To:Cc:In-Reply-To:References:Date; b=V0sXocaSYQi1xJqIt1MJBdQzPhZD56BHBzx2m7Yw0YvJlKm/n/fHnWNSauFyKWV5z zNzTWGK/iFFwE+3x1Ak1tagoeCjsnadtm9wSEkHbw90gj+TOltpVAtj9SXn43yKJmf 0n/67q79i+1sQA53I2SYp+edL/sjVAnbH56U6DPa4G9rAY6EusqDThdfaNYdZroMDE lzwZ6EroTsbWJw6S+IjzuD0irNPcqh8slpr3mzTzFQ5oR47KkQ0VmF7KH9jsma9UOV 4A4d/TMUv9TB6ORGVL/BtfLzbJPS2jeOLBLIQFffPB2cUzJfzQFXluodTlVZNLTyu8 hVfMkzX/tHOLw== MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: 7bit Subject: Re: [PATCH mm-hotfixes v2 2/4] x86/mm/pat: acquire mmap lock on page table free to avoid ptdump UAF From: Lorenzo Stoakes To: Borislav Petkov Cc: Lorenzo Stoakes , Andrew Morton , Suren Baghdasaryan , "Liam R. Howlett" , Vlastimil Babka , Shakeel Butt , David Hildenbrand , Mike Rapoport , Michal Hocko , Uladzislau Rezki , Toshi Kani , Dave Hansen , Andy Lutomirski , Peter Zijlstra , Thomas Gleixner , Ingo Molnar , x86@kernel.org, "H. Peter Anvin" , Kiryl Shutsemau , Catalin Marinas , Will Deacon , Dev Jain , Ryan Roberts , David Carlier , linux-mm@kvack.org, linux-kernel@vger.kernel.org, bpf@vger.kernel.org, linux-arm-kernel@lists.infradead.org, stable@vger.kernel.org In-Reply-To: <20260712165341.GAalPGldsKpBs5treJ@fat_crate.local> References: <20260712-series-vmap-race-fix-v2-0-ad134cc3a12a@kernel.org> <20260712-series-vmap-race-fix-v2-2-ad134cc3a12a@kernel.org> <20260712165341.GAalPGldsKpBs5treJ@fat_crate.local> Date: Tue, 14 Jul 2026 10:47:20 +0100 Message-Id: <178402244099.69739.5281491459981359633.b4-reply@b4> X-Mailer: b4 0.15.2 X-Developer-Signature: v=1; a=openpgp-sha256; l=642; i=ljs@kernel.org; h=from:subject:message-id; bh=t4XiP/IHs/MAWTmAJpg8U8XhqPVl/Di3JCGllCa8vzE=; b=owGbwMvMwCV2fu7ZrsZH9SKMp9WSGLLCWFcta9IJr9ALSwlJ11PfNz119ZLQC4ssPNa9fy9c8 53xZt7HjlIWBjEuBlkxRZbnX8T3B4mEzeu84O8GM4eVCWQIAxenAEwkkoeRoeedzY2VCb/y5dql I87/W3A80feA/QmBunpebqWfO4IZyxj+J/eLv1gpe2b6b+2PijPuX0mbW1f4l+297Me6f7PDA9j CGAE= X-Developer-Key: i=ljs@kernel.org; a=openpgp; fpr=E7F417BF5214569E89D04F46CF9DCD8A81E27F14 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 2026-07-12 09:53 -0700, Borislav Petkov wrote: > On Sun, Jul 12, 2026 at 11:42:25AM +0100, Lorenzo Stoakes wrote: > > This patch resolves the issue by acquiring the mmap read lock on init_mm to > > s/This patch resolves/Resolve/ > > > provide mutual exclusion against ptdump, which acquires the init_mm write > > lock. > > ... > > > We also include cleanup.h in order to use a scoped_guard() to implement > > this cleanly. > > You don't need to explain that. > > Thx. OK will reword on respin. > > -- > Regards/Gruss, > Boris. > > https://people.kernel.org/tglx/notes-about-netiquette > Thanks, Lorenzo