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 kanga.kvack.org (kanga.kvack.org [205.233.56.17]) (using TLSv1 with cipher DHE-RSA-AES256-SHA (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id 0EC14C43458 for ; Tue, 14 Jul 2026 09:47:41 +0000 (UTC) Received: by kanga.kvack.org (Postfix) id ED1636B009E; Tue, 14 Jul 2026 05:47:39 -0400 (EDT) Received: by kanga.kvack.org (Postfix, from userid 40) id EA8F16B00A0; Tue, 14 Jul 2026 05:47:39 -0400 (EDT) X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id DBF6B6B00A1; Tue, 14 Jul 2026 05:47:39 -0400 (EDT) X-Delivered-To: linux-mm@kvack.org Received: from relay.hostedemail.com (smtprelay0016.hostedemail.com [216.40.44.16]) by kanga.kvack.org (Postfix) with ESMTP id B4E096B009E for ; Tue, 14 Jul 2026 05:47:39 -0400 (EDT) Received: from smtpin30.hostedemail.com (lb01a-stub [10.200.18.249]) by unirelay06.hostedemail.com (Postfix) with ESMTP id 43870A028C for ; Tue, 14 Jul 2026 09:47:39 +0000 (UTC) X-FDA: 84986905038.30.3C640E2 Received: from sea.source.kernel.org (sea.source.kernel.org [172.234.252.31]) by imf25.hostedemail.com (Postfix) with ESMTP id 7708AA000E for ; Tue, 14 Jul 2026 09:47:37 +0000 (UTC) Authentication-Results: imf25.hostedemail.com; dkim=pass header.d=kernel.org header.s=k20260515 header.b=V0sXocaS; spf=pass (imf25.hostedemail.com: domain of ljs@kernel.org designates 172.234.252.31 as permitted sender) smtp.mailfrom=ljs@kernel.org; dmarc=pass (policy=quarantine) header.from=kernel.org ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=hostedemail.com; s=arc-20220608; t=1784022457; h=from:from:sender:reply-to:subject:subject:date:date: message-id:message-id:to:to:cc:cc:mime-version:mime-version: content-type:content-type: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references:dkim-signature; bh=3cRD5tp61vGr5S2DsLizm6q3lmn7Tl+FjuVbnFjpaWY=; b=2CoxlOvBYYZ49FFmu5kPptrJEWzp/MfRiaiY4S8d3BMNAEFiHukSE2Z+D4nmMlUZqnzws3 oTCNx2yDXsvn64TBnycfZBhIK/QU5YloRpeZCb5rHkN9jfRUQjTac7xNw114r1iBrIds0T Yl1eL10SQot5UpZQogOC0s0KqrhRTF4= ARC-Authentication-Results: i=1; imf25.hostedemail.com; dkim=pass header.d=kernel.org header.s=k20260515 header.b=V0sXocaS; spf=pass (imf25.hostedemail.com: domain of ljs@kernel.org designates 172.234.252.31 as permitted sender) smtp.mailfrom=ljs@kernel.org; dmarc=pass (policy=quarantine) header.from=kernel.org ARC-Seal: i=1; a=rsa-sha256; d=hostedemail.com; s=arc-20220608; cv=none; t=1784022457; b=eIMJgNxzlq9yDzP/gTnSU4SfkKrXiWsy87v6n/y2+Ss+TD+xNDlJtK5RwT72o5l2OLoXHr wwvfvJlNBOINTEuurXtj9xv4KeFePC24ByqWDnOfEAIjZC0z+hc1w8rREdJq8ya5AL0EVy 6QZMS5p0m7ZA2btk87jL2eMYYUo6njc= 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-Rspam-User: X-Rspamd-Server: rspam05 X-Rspamd-Queue-Id: 7708AA000E X-Stat-Signature: ezefb9urkgu8sbbdg5ssqpqsi5ucdq6q X-HE-Tag: 1784022457-233705 X-HE-Meta: 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 KL6OmNYY 4F8Vs5OEK9uN/UenTrTF0Et7yl5u8ih2tJfrVn3tgSg9JXDP48bIQWrxFlXZpIDL3tXsFI37jc1pqcsndALss+eTL6dKwslsV/UeNG4w8difqrWi5Wsfo0CoCowHxIr5SDKp0iutS/eaY90PT9O7lpFJF6X5H16JayPmK8uKMoMFQ2u0tWAOWOEggAbXTiPn+PnrsnOOGOLBJ0lRvlB3D0p8qZfXv/7f78ghPcq8dFdGacaMdZFAvTk1rkg== Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: 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