From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-alma10-1.taild15c8.ts.net [100.103.45.18]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 336F848F009; Thu, 1 Oct 2026 12:11:58 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=100.103.45.18 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1790856737; cv=none; b=i1j/eejOtCkp9701yIyoMpxSWyZz1qNfhLTEs/Rmep3Ah7/FqtfwYSZ3wOq48qDTgipnpAxgLFTlRsvR12ICks3gaw4BSmK0yY8ehHnxIMveoEx20tr9Y9NVUM6SlEGpDNxDb1njB0CCdx3/4Pa3MbAgf7zemMnhbWiI5kGEdzs= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1790856737; c=relaxed/simple; bh=WOJ3esNsSkw53UIahrsEElL3cpWrWqo025ce1m4b3v4=; h=Message-ID:Date:MIME-Version:Subject:To:Cc:References:From: In-Reply-To:Content-Type; b=rU9tSFkwjMtxjFZYVez4+U+899ldrwGCV9/dgRK/ud1dCL1dkbQfMoc8T8A1ZQr9DYeqtcIvu3Fa8pEEDA2XDOSlbtoNMbpoEFzV9qfosRQynGqIQv+gSsHMPGU1Bl8+cK02zIKwPC/sOg04x5pGoKJxPR84hM4Y3MyGCaaXC80= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=aTTG82Se; arc=none smtp.client-ip=100.103.45.18 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b="aTTG82Se" Received: by smtp.kernel.org (Postfix) with ESMTPSA id D21261F000FF; Thu, 1 Oct 2026 12:11:17 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=kernel.org; s=k20260515; t=1790856714; bh=KUH7OP4iWerRy/EG23fSkrllMLjJHrglwjsFo+POc+k=; h=Date:Subject:To:Cc:References:From:In-Reply-To; b=aTTG82SemKTBXalZAmyFggcAXHDZ3Rsp4Cmfpknx90oZs6SjaSeN6xwh0MitYl62A KbssxTzqFSUEaggtmL6jMvB86LHa2jnsZFHU/xrFBjAVC+9Vtp/rgHsKyXKeBH1VQF 9FeHXun8+ubEbhMVwacSZzjlGMqbT+bDhQDFsP36vzpqNZmSFxVhkJxegmT5trTh2S WTJrAzj4QhQv4yAGrgeBv/EjE3x6hX29NRXk7FHaMci8pJd/RkHk6Oi6wu97anKLlR xjZeUVyQJ4+Imjtns2I7vZIcC7bQJHhg68rEr35+FgQQDLatQ4Ka6FVZa7YRWF+qhX EShwAA+rZgLzQ== Message-ID: <119abf62-6fd8-424f-ad26-18fda1bea269@kernel.org> Date: Thu, 1 Oct 2026 14:11:14 +0200 Precedence: bulk X-Mailing-List: linux-fbdev@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH v3 05/40] mm/vma: ensure mmap_prepare doesn't set actions on a mergeable vma To: "Lorenzo Stoakes (ARM)" , Suren Baghdasaryan Cc: Andrew Morton , "Liam R. Howlett" , Vlastimil Babka , Jann Horn , Pedro Falcato , Mike Rapoport , Michal Hocko , Jonathan Corbet , Greg Kroah-Hartman , Dennis Dalessandro , Jason Gunthorpe , Leon Romanovsky , Paul Moore , Stephen Smalley , Jaroslav Kysela , Takashi Iwai , Alexei Starovoitov , Daniel Borkmann , Andrii Nakryiko , Eduard Zingerman , Kumar Kartikeya Dwivedi , Zi Yan , Baolin Wang , Nico Pache , Ryan Roberts , Dev Jain , Barry Song , Lance Yang , Usama Arif , Kiryl Shutsemau , Doug Gilbert , "James E.J. Bottomley" , "Martin K. Petersen" , Jaya Kumar , Simona Vetter , Helge Deller , Sebastian Reichel , John Hubbard , Peter Xu , Masami Hiramatsu , Oleg Nesterov , Peter Zijlstra , Thomas Gleixner , Ingo Molnar , Borislav Petkov , Dave Hansen , x86@kernel.org, Arnaldo Carvalho de Melo , Namhyung Kim , Mark Rutland , Rik van Riel , Harry Yoo , Juri Lelli , Vincent Guittot , Maarten Lankhorst , Maxime Ripard , Thomas Zimmermann , David Airlie , Will Deacon , "Aneesh Kumar K.V" , Nick Piggin , Arnd Bergmann , Muchun Song , Oscar Salvador , "Matthew Wilcox (Oracle)" , Jan Kara , Marc Zyngier , Oliver Upton , Catalin Marinas , Madhavan Srinivasan , Anup Patel , Paul Walmsley , Palmer Dabbelt , Albert Ou , Christian Borntraeger , Janosch Frank , Claudio Imbrenda , Alexander Gordeev , Gerald Schaefer , Heiko Carstens , Vasily Gorbik , "David S. Miller" , Andreas Larsson , Alexander Viro , Christian Brauner , Matthew Brost , Joshua Hahn , Rakie Kim , Byungchul Park , Gregory Price , Ying Huang , Alistair Popple , Chris Li , Kairui Song , Kemeng Shi , Nhat Pham , Baoquan He , Youngjun Park , Johannes Weiner , Qi Zheng , Shakeel Butt , Axel Rasmussen , Yuanchu Xie , Wei Xu , Chengming Zhou , Michal Hocko , Miklos Szeredi , Xu Xin , linux-mm@kvack.org, linux-kernel@vger.kernel.org, linux-doc@vger.kernel.org, linux-usb@vger.kernel.org, linux-rdma@vger.kernel.org, selinux@vger.kernel.org, linux-sound@vger.kernel.org, bpf@vger.kernel.org, linux-scsi@vger.kernel.org, linux-fbdev@vger.kernel.org, dri-devel@lists.freedesktop.org, linux-trace-kernel@vger.kernel.org, linux-perf-users@vger.kernel.org, linux-arch@vger.kernel.org, linux-fsdevel@vger.kernel.org, linux-arm-kernel@lists.infradead.org, kvmarm@lists.linux.dev, linuxppc-dev@lists.ozlabs.org, kvm@vger.kernel.org, kvm-riscv@lists.infradead.org, linux-riscv@lists.infradead.org, linux-s390@vger.kernel.org, sparclinux@vger.kernel.org, fuse-devel@lists.linux.dev References: <20260917-b4-mmap-prepare-vma-flag-sanify-v3-0-4583d8a23bca@kernel.org> <20260917-b4-mmap-prepare-vma-flag-sanify-v3-5-4583d8a23bca@kernel.org> From: "David Hildenbrand (Arm)" Content-Language: en-US Autocrypt: addr=david@kernel.org; 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charset=UTF-8 Content-Transfer-Encoding: 8bit On 9/25/26 11:53, Lorenzo Stoakes (ARM) wrote: > On Fri, Sep 25, 2026 at 12:28:49AM -0700, Suren Baghdasaryan wrote: >> On Thu, Sep 17, 2026 at 9:25 AM Lorenzo Stoakes (ARM) wrote: >>> >>> When a user requests an mmap_action be performed in mmap_prepare, this >>> involves populating the VMA range with data. >>> >>> However, if the VMA is mergeable, it might then mistakenly be merged with >>> another VMA without having populated the range. >>> >>> Every mmap action currently available sets VMA flags such that the VMA >>> cannot be merged. >>> >>> However, to ensure that no future mmap action falls foul of this, assert >>> that this is the case upon mmap_prepare validation. >>> >>> Signed-off-by: Lorenzo Stoakes (ARM) >> >> Reviewed-by: Suren Baghdasaryan > > Thanks! > >> >>> --- >>> mm/vma.c | 9 +++++++++ >>> 1 file changed, 9 insertions(+) >>> >>> diff --git a/mm/vma.c b/mm/vma.c >>> index d6ed10cefc8f..62f2ce1ad5a1 100644 >>> --- a/mm/vma.c >>> +++ b/mm/vma.c >>> @@ -2809,6 +2809,15 @@ static int mmap_validate(unsigned long prev_start, unsigned long prev_end, >>> int mmap_prepare_validate(const struct vm_area_desc *prev_desc, >>> const struct vm_area_desc *desc) >>> { >>> + /* >>> + * It is not valid to execute mmap actions for VMAs which can be merged, >>> + * as any such merge would leave portions of the mapping incorrectly >>> + * unmapped. >>> + */ >>> + if (vma_flags_can_merge(&desc->vma_flags) && >>> + WARN_ON_ONCE(desc->action.type != MMAP_NOTHING)) >> >> Any reason you chose this "if (A && WARN_ON_ONCE(B))" pattern instead >> of a simpler "if (WARN_ON_ONCE(A && B))"? Unless there are races >> between A and B updates, I think these would be equivalent, right? > > They are equivalent yes! > > So it's more of a style thing, as that reads less clearly to me: > > if (WARN_ON_ONCE(vma_flags_can_merge(&desc->vma_flags) && > desc->action.type != MMAP_NOTHING)) > > And this version highlights what is the broken thing here (action type set) a > little more clearly though obviously that's only if mergeable so arguable. > > I don't have a really strong opinion though I can change it if you prefer? Looks clearer to me like that Acked-by: David Hildenbrand (Arm) -- Cheers, David 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 A93CDCA600E for ; Wed, 7 Oct 2026 17:53:58 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20210309; h=Sender: Content-Transfer-Encoding:Content-Type:List-Subscribe:List-Help:List-Post: List-Archive:List-Unsubscribe:List-Id:In-Reply-To:From:References:Cc:To: Subject:MIME-Version:Date:Message-ID:Reply-To:Content-ID:Content-Description: Resent-Date:Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID: List-Owner; bh=LdPVA3oI9i1fdchg1WXkZqbZqlzKF4wvumV1Uv6/32I=; b=ANr0dHeKwprdyq uUVqofXxQX/IDpZV2ogO9SlyFyRr4uBPu8AlM9tqhi3MiNc8KKAoW4uMTeUcR583dV4htm8kobZAI O9Bf9RXqqLkqLJSs7WpUsJeX5dL7Dg5C8CTnh/YwYa5SDjionVwxwaQWmad4I+n6BuPTb0q0T/E+w hQkdVoRlK0LZGkh/XLovoHKTURaA3d8pHdFzPZ7xOYfA5V5Zz8I+OcZPTUSe8sMuxxyDeVWUzPM8A P7FETDBwM3tCqmZuQrtd6nQckbBWMVF1xCaAd/xpOHEAbCYzozLzDx9kQQEtCGMHXcvHxzTQzQ1s0 o+av5Q2Jt6Vr3Z/pCIag==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.99.1 #2 (Red Hat Linux)) id 1xEVok-00000002pEg-2vFJ; Wed, 07 Oct 2026 17:52:38 +0000 Received: from tor.source.kernel.org ([172.105.4.254]) by bombadil.infradead.org with esmtps (Exim 4.99.1 #2 (Red Hat Linux)) id 1xCFdj-0000000921d-3oC0; Thu, 01 Oct 2026 12:11:56 +0000 Received: from smtp.kernel.org (quasi.space.kernel.org [100.103.45.18]) by tor.source.kernel.org (Postfix) with ESMTP id 19B3F60A55; Thu, 1 Oct 2026 12:11:55 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id D21261F000FF; Thu, 1 Oct 2026 12:11:17 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=kernel.org; s=k20260515; t=1790856714; bh=KUH7OP4iWerRy/EG23fSkrllMLjJHrglwjsFo+POc+k=; h=Date:Subject:To:Cc:References:From:In-Reply-To; b=aTTG82SemKTBXalZAmyFggcAXHDZ3Rsp4Cmfpknx90oZs6SjaSeN6xwh0MitYl62A KbssxTzqFSUEaggtmL6jMvB86LHa2jnsZFHU/xrFBjAVC+9Vtp/rgHsKyXKeBH1VQF 9FeHXun8+ubEbhMVwacSZzjlGMqbT+bDhQDFsP36vzpqNZmSFxVhkJxegmT5trTh2S WTJrAzj4QhQv4yAGrgeBv/EjE3x6hX29NRXk7FHaMci8pJd/RkHk6Oi6wu97anKLlR xjZeUVyQJ4+Imjtns2I7vZIcC7bQJHhg68rEr35+FgQQDLatQ4Ka6FVZa7YRWF+qhX EShwAA+rZgLzQ== Message-ID: <119abf62-6fd8-424f-ad26-18fda1bea269@kernel.org> Date: Thu, 1 Oct 2026 14:11:14 +0200 MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH v3 05/40] mm/vma: ensure mmap_prepare doesn't set actions on a mergeable vma To: "Lorenzo Stoakes (ARM)" , Suren Baghdasaryan Cc: Andrew Morton , "Liam R. Howlett" , Vlastimil Babka , Jann Horn , Pedro Falcato , Mike Rapoport , Michal Hocko , Jonathan Corbet , Greg Kroah-Hartman , Dennis Dalessandro , Jason Gunthorpe , Leon Romanovsky , Paul Moore , Stephen Smalley , Jaroslav Kysela , Takashi Iwai , Alexei Starovoitov , Daniel Borkmann , Andrii Nakryiko , Eduard Zingerman , Kumar Kartikeya Dwivedi , Zi Yan , Baolin Wang , Nico Pache , Ryan Roberts , Dev Jain , Barry Song , Lance Yang , Usama Arif , Kiryl Shutsemau , Doug Gilbert , "James E.J. Bottomley" , "Martin K. Petersen" , Jaya Kumar , Simona Vetter , Helge Deller , Sebastian Reichel , John Hubbard , Peter Xu , Masami Hiramatsu , Oleg Nesterov , Peter Zijlstra , Thomas Gleixner , Ingo Molnar , Borislav Petkov , Dave Hansen , x86@kernel.org, Arnaldo Carvalho de Melo , Namhyung Kim , Mark Rutland , Rik van Riel , Harry Yoo , Juri Lelli , Vincent Guittot , Maarten Lankhorst , Maxime Ripard , Thomas Zimmermann , David Airlie , Will Deacon , "Aneesh Kumar K.V" , Nick Piggin , Arnd Bergmann , Muchun Song , Oscar Salvador , "Matthew Wilcox (Oracle)" , Jan Kara , Marc Zyngier , Oliver Upton , Catalin Marinas , Madhavan Srinivasan , Anup Patel , Paul Walmsley , Palmer Dabbelt , Albert Ou , Christian Borntraeger , Janosch Frank , Claudio Imbrenda , Alexander Gordeev , Gerald Schaefer , Heiko Carstens , Vasily Gorbik , "David S. Miller" , Andreas Larsson , Alexander Viro , Christian Brauner , Matthew Brost , Joshua Hahn , Rakie Kim , Byungchul Park , Gregory Price , Ying Huang , Alistair Popple , Chris Li , Kairui Song , Kemeng Shi , Nhat Pham , Baoquan He , Youngjun Park , Johannes Weiner , Qi Zheng , Shakeel Butt , Axel Rasmussen , Yuanchu Xie , Wei Xu , Chengming Zhou , Michal Hocko , Miklos Szeredi , Xu Xin , linux-mm@kvack.org, linux-kernel@vger.kernel.org, linux-doc@vger.kernel.org, linux-usb@vger.kernel.org, linux-rdma@vger.kernel.org, selinux@vger.kernel.org, linux-sound@vger.kernel.org, bpf@vger.kernel.org, linux-scsi@vger.kernel.org, linux-fbdev@vger.kernel.org, dri-devel@lists.freedesktop.org, linux-trace-kernel@vger.kernel.org, linux-perf-users@vger.kernel.org, linux-arch@vger.kernel.org, linux-fsdevel@vger.kernel.org, linux-arm-kernel@lists.infradead.org, kvmarm@lists.linux.dev, linuxppc-dev@lists.ozlabs.org, kvm@vger.kernel.org, kvm-riscv@lists.infradead.org, linux-riscv@lists.infradead.org, linux-s390@vger.kernel.org, sparclinux@vger.kernel.org, fuse-devel@lists.linux.dev References: <20260917-b4-mmap-prepare-vma-flag-sanify-v3-0-4583d8a23bca@kernel.org> <20260917-b4-mmap-prepare-vma-flag-sanify-v3-5-4583d8a23bca@kernel.org> From: "David Hildenbrand (Arm)" Content-Language: en-US Autocrypt: addr=david@kernel.org; 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charset="utf-8" Content-Transfer-Encoding: base64 Sender: "linux-riscv" Errors-To: linux-riscv-bounces+linux-riscv=archiver.kernel.org@lists.infradead.org T24gOS8yNS8yNiAxMTo1MywgTG9yZW56byBTdG9ha2VzIChBUk0pIHdyb3RlOgo+IE9uIEZyaSwg U2VwIDI1LCAyMDI2IGF0IDEyOjI4OjQ5QU0gLTA3MDAsIFN1cmVuIEJhZ2hkYXNhcnlhbiB3cm90 ZToKPj4gT24gVGh1LCBTZXAgMTcsIDIwMjYgYXQgOToyNeKAr0FNIExvcmVuem8gU3RvYWtlcyAo QVJNKSA8bGpzQGtlcm5lbC5vcmc+IHdyb3RlOgo+Pj4KPj4+IFdoZW4gYSB1c2VyIHJlcXVlc3Rz IGFuIG1tYXBfYWN0aW9uIGJlIHBlcmZvcm1lZCBpbiBtbWFwX3ByZXBhcmUsIHRoaXMKPj4+IGlu dm9sdmVzIHBvcHVsYXRpbmcgdGhlIFZNQSByYW5nZSB3aXRoIGRhdGEuCj4+Pgo+Pj4gSG93ZXZl ciwgaWYgdGhlIFZNQSBpcyBtZXJnZWFibGUsIGl0IG1pZ2h0IHRoZW4gbWlzdGFrZW5seSBiZSBt ZXJnZWQgd2l0aAo+Pj4gYW5vdGhlciBWTUEgd2l0aG91dCBoYXZpbmcgcG9wdWxhdGVkIHRoZSBy YW5nZS4KPj4+Cj4+PiBFdmVyeSBtbWFwIGFjdGlvbiBjdXJyZW50bHkgYXZhaWxhYmxlIHNldHMg Vk1BIGZsYWdzIHN1Y2ggdGhhdCB0aGUgVk1BCj4+PiBjYW5ub3QgYmUgbWVyZ2VkLgo+Pj4KPj4+ IEhvd2V2ZXIsIHRvIGVuc3VyZSB0aGF0IG5vIGZ1dHVyZSBtbWFwIGFjdGlvbiBmYWxscyBmb3Vs IG9mIHRoaXMsIGFzc2VydAo+Pj4gdGhhdCB0aGlzIGlzIHRoZSBjYXNlIHVwb24gbW1hcF9wcmVw YXJlIHZhbGlkYXRpb24uCj4+Pgo+Pj4gU2lnbmVkLW9mZi1ieTogTG9yZW56byBTdG9ha2VzIChB Uk0pIDxsanNAa2VybmVsLm9yZz4KPj4KPj4gUmV2aWV3ZWQtYnk6IFN1cmVuIEJhZ2hkYXNhcnlh biA8c3VyZW5iQGdvb2dsZS5jb20+Cj4gCj4gVGhhbmtzIQo+IAo+Pgo+Pj4gLS0tCj4+PiAgbW0v dm1hLmMgfCA5ICsrKysrKysrKwo+Pj4gIDEgZmlsZSBjaGFuZ2VkLCA5IGluc2VydGlvbnMoKykK Pj4+Cj4+PiBkaWZmIC0tZ2l0IGEvbW0vdm1hLmMgYi9tbS92bWEuYwo+Pj4gaW5kZXggZDZlZDEw Y2VmYzhmLi42MmYyY2UxYWQ1YTEgMTAwNjQ0Cj4+PiAtLS0gYS9tbS92bWEuYwo+Pj4gKysrIGIv bW0vdm1hLmMKPj4+IEBAIC0yODA5LDYgKzI4MDksMTUgQEAgc3RhdGljIGludCBtbWFwX3ZhbGlk YXRlKHVuc2lnbmVkIGxvbmcgcHJldl9zdGFydCwgdW5zaWduZWQgbG9uZyBwcmV2X2VuZCwKPj4+ ICBpbnQgbW1hcF9wcmVwYXJlX3ZhbGlkYXRlKGNvbnN0IHN0cnVjdCB2bV9hcmVhX2Rlc2MgKnBy ZXZfZGVzYywKPj4+ICAgICAgICAgICAgICAgICAgICAgICAgICAgY29uc3Qgc3RydWN0IHZtX2Fy ZWFfZGVzYyAqZGVzYykKPj4+ICB7Cj4+PiArICAgICAgIC8qCj4+PiArICAgICAgICAqIEl0IGlz IG5vdCB2YWxpZCB0byBleGVjdXRlIG1tYXAgYWN0aW9ucyBmb3IgVk1BcyB3aGljaCBjYW4gYmUg bWVyZ2VkLAo+Pj4gKyAgICAgICAgKiBhcyBhbnkgc3VjaCBtZXJnZSB3b3VsZCBsZWF2ZSBwb3J0 aW9ucyBvZiB0aGUgbWFwcGluZyBpbmNvcnJlY3RseQo+Pj4gKyAgICAgICAgKiB1bm1hcHBlZC4K Pj4+ICsgICAgICAgICovCj4+PiArICAgICAgIGlmICh2bWFfZmxhZ3NfY2FuX21lcmdlKCZkZXNj LT52bWFfZmxhZ3MpICYmCj4+PiArICAgICAgICAgICBXQVJOX09OX09OQ0UoZGVzYy0+YWN0aW9u LnR5cGUgIT0gTU1BUF9OT1RISU5HKSkKPj4KPj4gQW55IHJlYXNvbiB5b3UgY2hvc2UgdGhpcyAi aWYgKEEgJiYgV0FSTl9PTl9PTkNFKEIpKSIgcGF0dGVybiBpbnN0ZWFkCj4+IG9mIGEgc2ltcGxl ciAiaWYgKFdBUk5fT05fT05DRShBICYmIEIpKSI/IFVubGVzcyB0aGVyZSBhcmUgcmFjZXMKPj4g YmV0d2VlbiBBIGFuZCBCIHVwZGF0ZXMsIEkgdGhpbmsgdGhlc2Ugd291bGQgYmUgZXF1aXZhbGVu dCwgcmlnaHQ/Cj4gCj4gVGhleSBhcmUgZXF1aXZhbGVudCB5ZXMhCj4gCj4gU28gaXQncyBtb3Jl IG9mIGEgc3R5bGUgdGhpbmcsIGFzIHRoYXQgcmVhZHMgbGVzcyBjbGVhcmx5IHRvIG1lOgo+IAo+ IAlpZiAoV0FSTl9PTl9PTkNFKHZtYV9mbGFnc19jYW5fbWVyZ2UoJmRlc2MtPnZtYV9mbGFncykg JiYKPiAJCQkgZGVzYy0+YWN0aW9uLnR5cGUgIT0gTU1BUF9OT1RISU5HKSkKPiAKPiBBbmQgdGhp cyB2ZXJzaW9uIGhpZ2hsaWdodHMgd2hhdCBpcyB0aGUgYnJva2VuIHRoaW5nIGhlcmUgKGFjdGlv biB0eXBlIHNldCkgYQo+IGxpdHRsZSBtb3JlIGNsZWFybHkgdGhvdWdoIG9idmlvdXNseSB0aGF0 J3Mgb25seSBpZiBtZXJnZWFibGUgc28gYXJndWFibGUuCj4gCj4gSSBkb24ndCBoYXZlIGEgcmVh bGx5IHN0cm9uZyBvcGluaW9uIHRob3VnaCBJIGNhbiBjaGFuZ2UgaXQgaWYgeW91IHByZWZlcj8K Ckxvb2tzIGNsZWFyZXIgdG8gbWUgbGlrZSB0aGF0CgpBY2tlZC1ieTogRGF2aWQgSGlsZGVuYnJh bmQgKEFybSkgPGRhdmlkQGtlcm5lbC5vcmc+CgotLSAKQ2hlZXJzLAoKRGF2aWQKCl9fX19fX19f X19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fCmxpbnV4LXJpc2N2IG1haWxp bmcgbGlzdApsaW51eC1yaXNjdkBsaXN0cy5pbmZyYWRlYWQub3JnCmh0dHA6Ly9saXN0cy5pbmZy YWRlYWQub3JnL21haWxtYW4vbGlzdGluZm8vbGludXgtcmlzY3YK 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 7F36ACA5FB3 for ; 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Thu, 01 Oct 2026 12:11:57 +0000 Received: from tor.source.kernel.org ([172.105.4.254]) by bombadil.infradead.org with esmtps (Exim 4.99.1 #2 (Red Hat Linux)) id 1xCFdj-0000000921d-3oC0; Thu, 01 Oct 2026 12:11:56 +0000 Received: from smtp.kernel.org (quasi.space.kernel.org [100.103.45.18]) by tor.source.kernel.org (Postfix) with ESMTP id 19B3F60A55; Thu, 1 Oct 2026 12:11:55 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id D21261F000FF; Thu, 1 Oct 2026 12:11:17 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=kernel.org; s=k20260515; t=1790856714; bh=KUH7OP4iWerRy/EG23fSkrllMLjJHrglwjsFo+POc+k=; h=Date:Subject:To:Cc:References:From:In-Reply-To; b=aTTG82SemKTBXalZAmyFggcAXHDZ3Rsp4Cmfpknx90oZs6SjaSeN6xwh0MitYl62A KbssxTzqFSUEaggtmL6jMvB86LHa2jnsZFHU/xrFBjAVC+9Vtp/rgHsKyXKeBH1VQF 9FeHXun8+ubEbhMVwacSZzjlGMqbT+bDhQDFsP36vzpqNZmSFxVhkJxegmT5trTh2S WTJrAzj4QhQv4yAGrgeBv/EjE3x6hX29NRXk7FHaMci8pJd/RkHk6Oi6wu97anKLlR xjZeUVyQJ4+Imjtns2I7vZIcC7bQJHhg68rEr35+FgQQDLatQ4Ka6FVZa7YRWF+qhX EShwAA+rZgLzQ== Message-ID: <119abf62-6fd8-424f-ad26-18fda1bea269@kernel.org> Date: Thu, 1 Oct 2026 14:11:14 +0200 MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH v3 05/40] mm/vma: ensure mmap_prepare doesn't set actions on a mergeable vma To: "Lorenzo Stoakes (ARM)" , Suren Baghdasaryan Cc: Andrew Morton , "Liam R. Howlett" , Vlastimil Babka , Jann Horn , Pedro Falcato , Mike Rapoport , Michal Hocko , Jonathan Corbet , Greg Kroah-Hartman , Dennis Dalessandro , Jason Gunthorpe , Leon Romanovsky , Paul Moore , Stephen Smalley , Jaroslav Kysela , Takashi Iwai , Alexei Starovoitov , Daniel Borkmann , Andrii Nakryiko , Eduard Zingerman , Kumar Kartikeya Dwivedi , Zi Yan , Baolin Wang , Nico Pache , Ryan Roberts , Dev Jain , Barry Song , Lance Yang , Usama Arif , Kiryl Shutsemau , Doug Gilbert , "James E.J. Bottomley" , "Martin K. Petersen" , Jaya Kumar , Simona Vetter , Helge Deller , Sebastian Reichel , John Hubbard , Peter Xu , Masami Hiramatsu , Oleg Nesterov , Peter Zijlstra , Thomas Gleixner , Ingo Molnar , Borislav Petkov , Dave Hansen , x86@kernel.org, Arnaldo Carvalho de Melo , Namhyung Kim , Mark Rutland , Rik van Riel , Harry Yoo , Juri Lelli , Vincent Guittot , Maarten Lankhorst , Maxime Ripard , Thomas Zimmermann , David Airlie , Will Deacon , "Aneesh Kumar K.V" , Nick Piggin , Arnd Bergmann , Muchun Song , Oscar Salvador , "Matthew Wilcox (Oracle)" , Jan Kara , Marc Zyngier , Oliver Upton , Catalin Marinas , Madhavan Srinivasan , Anup Patel , Paul Walmsley , Palmer Dabbelt , Albert Ou , Christian Borntraeger , Janosch Frank , Claudio Imbrenda , Alexander Gordeev , Gerald Schaefer , Heiko Carstens , Vasily Gorbik , "David S. Miller" , Andreas Larsson , Alexander Viro , Christian Brauner , Matthew Brost , Joshua Hahn , Rakie Kim , Byungchul Park , Gregory Price , Ying Huang , Alistair Popple , Chris Li , Kairui Song , Kemeng Shi , Nhat Pham , Baoquan He , Youngjun Park , Johannes Weiner , Qi Zheng , Shakeel Butt , Axel Rasmussen , Yuanchu Xie , Wei Xu , Chengming Zhou , Michal Hocko , Miklos Szeredi , Xu Xin , linux-mm@kvack.org, linux-kernel@vger.kernel.org, linux-doc@vger.kernel.org, linux-usb@vger.kernel.org, linux-rdma@vger.kernel.org, selinux@vger.kernel.org, linux-sound@vger.kernel.org, bpf@vger.kernel.org, linux-scsi@vger.kernel.org, linux-fbdev@vger.kernel.org, dri-devel@lists.freedesktop.org, linux-trace-kernel@vger.kernel.org, linux-perf-users@vger.kernel.org, linux-arch@vger.kernel.org, linux-fsdevel@vger.kernel.org, linux-arm-kernel@lists.infradead.org, kvmarm@lists.linux.dev, linuxppc-dev@lists.ozlabs.org, kvm@vger.kernel.org, kvm-riscv@lists.infradead.org, linux-riscv@lists.infradead.org, linux-s390@vger.kernel.org, sparclinux@vger.kernel.org, fuse-devel@lists.linux.dev References: <20260917-b4-mmap-prepare-vma-flag-sanify-v3-0-4583d8a23bca@kernel.org> <20260917-b4-mmap-prepare-vma-flag-sanify-v3-5-4583d8a23bca@kernel.org> From: "David Hildenbrand (Arm)" Content-Language: en-US Autocrypt: addr=david@kernel.org; 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charset="utf-8" Content-Transfer-Encoding: base64 Sender: "kvm-riscv" Errors-To: kvm-riscv-bounces+kvm-riscv=archiver.kernel.org@lists.infradead.org T24gOS8yNS8yNiAxMTo1MywgTG9yZW56byBTdG9ha2VzIChBUk0pIHdyb3RlOgo+IE9uIEZyaSwg U2VwIDI1LCAyMDI2IGF0IDEyOjI4OjQ5QU0gLTA3MDAsIFN1cmVuIEJhZ2hkYXNhcnlhbiB3cm90 ZToKPj4gT24gVGh1LCBTZXAgMTcsIDIwMjYgYXQgOToyNeKAr0FNIExvcmVuem8gU3RvYWtlcyAo QVJNKSA8bGpzQGtlcm5lbC5vcmc+IHdyb3RlOgo+Pj4KPj4+IFdoZW4gYSB1c2VyIHJlcXVlc3Rz IGFuIG1tYXBfYWN0aW9uIGJlIHBlcmZvcm1lZCBpbiBtbWFwX3ByZXBhcmUsIHRoaXMKPj4+IGlu dm9sdmVzIHBvcHVsYXRpbmcgdGhlIFZNQSByYW5nZSB3aXRoIGRhdGEuCj4+Pgo+Pj4gSG93ZXZl ciwgaWYgdGhlIFZNQSBpcyBtZXJnZWFibGUsIGl0IG1pZ2h0IHRoZW4gbWlzdGFrZW5seSBiZSBt ZXJnZWQgd2l0aAo+Pj4gYW5vdGhlciBWTUEgd2l0aG91dCBoYXZpbmcgcG9wdWxhdGVkIHRoZSBy YW5nZS4KPj4+Cj4+PiBFdmVyeSBtbWFwIGFjdGlvbiBjdXJyZW50bHkgYXZhaWxhYmxlIHNldHMg Vk1BIGZsYWdzIHN1Y2ggdGhhdCB0aGUgVk1BCj4+PiBjYW5ub3QgYmUgbWVyZ2VkLgo+Pj4KPj4+ IEhvd2V2ZXIsIHRvIGVuc3VyZSB0aGF0IG5vIGZ1dHVyZSBtbWFwIGFjdGlvbiBmYWxscyBmb3Vs IG9mIHRoaXMsIGFzc2VydAo+Pj4gdGhhdCB0aGlzIGlzIHRoZSBjYXNlIHVwb24gbW1hcF9wcmVw YXJlIHZhbGlkYXRpb24uCj4+Pgo+Pj4gU2lnbmVkLW9mZi1ieTogTG9yZW56byBTdG9ha2VzIChB Uk0pIDxsanNAa2VybmVsLm9yZz4KPj4KPj4gUmV2aWV3ZWQtYnk6IFN1cmVuIEJhZ2hkYXNhcnlh biA8c3VyZW5iQGdvb2dsZS5jb20+Cj4gCj4gVGhhbmtzIQo+IAo+Pgo+Pj4gLS0tCj4+PiAgbW0v dm1hLmMgfCA5ICsrKysrKysrKwo+Pj4gIDEgZmlsZSBjaGFuZ2VkLCA5IGluc2VydGlvbnMoKykK Pj4+Cj4+PiBkaWZmIC0tZ2l0IGEvbW0vdm1hLmMgYi9tbS92bWEuYwo+Pj4gaW5kZXggZDZlZDEw Y2VmYzhmLi42MmYyY2UxYWQ1YTEgMTAwNjQ0Cj4+PiAtLS0gYS9tbS92bWEuYwo+Pj4gKysrIGIv bW0vdm1hLmMKPj4+IEBAIC0yODA5LDYgKzI4MDksMTUgQEAgc3RhdGljIGludCBtbWFwX3ZhbGlk YXRlKHVuc2lnbmVkIGxvbmcgcHJldl9zdGFydCwgdW5zaWduZWQgbG9uZyBwcmV2X2VuZCwKPj4+ ICBpbnQgbW1hcF9wcmVwYXJlX3ZhbGlkYXRlKGNvbnN0IHN0cnVjdCB2bV9hcmVhX2Rlc2MgKnBy ZXZfZGVzYywKPj4+ICAgICAgICAgICAgICAgICAgICAgICAgICAgY29uc3Qgc3RydWN0IHZtX2Fy ZWFfZGVzYyAqZGVzYykKPj4+ICB7Cj4+PiArICAgICAgIC8qCj4+PiArICAgICAgICAqIEl0IGlz IG5vdCB2YWxpZCB0byBleGVjdXRlIG1tYXAgYWN0aW9ucyBmb3IgVk1BcyB3aGljaCBjYW4gYmUg bWVyZ2VkLAo+Pj4gKyAgICAgICAgKiBhcyBhbnkgc3VjaCBtZXJnZSB3b3VsZCBsZWF2ZSBwb3J0 aW9ucyBvZiB0aGUgbWFwcGluZyBpbmNvcnJlY3RseQo+Pj4gKyAgICAgICAgKiB1bm1hcHBlZC4K Pj4+ICsgICAgICAgICovCj4+PiArICAgICAgIGlmICh2bWFfZmxhZ3NfY2FuX21lcmdlKCZkZXNj LT52bWFfZmxhZ3MpICYmCj4+PiArICAgICAgICAgICBXQVJOX09OX09OQ0UoZGVzYy0+YWN0aW9u LnR5cGUgIT0gTU1BUF9OT1RISU5HKSkKPj4KPj4gQW55IHJlYXNvbiB5b3UgY2hvc2UgdGhpcyAi aWYgKEEgJiYgV0FSTl9PTl9PTkNFKEIpKSIgcGF0dGVybiBpbnN0ZWFkCj4+IG9mIGEgc2ltcGxl ciAiaWYgKFdBUk5fT05fT05DRShBICYmIEIpKSI/IFVubGVzcyB0aGVyZSBhcmUgcmFjZXMKPj4g YmV0d2VlbiBBIGFuZCBCIHVwZGF0ZXMsIEkgdGhpbmsgdGhlc2Ugd291bGQgYmUgZXF1aXZhbGVu dCwgcmlnaHQ/Cj4gCj4gVGhleSBhcmUgZXF1aXZhbGVudCB5ZXMhCj4gCj4gU28gaXQncyBtb3Jl IG9mIGEgc3R5bGUgdGhpbmcsIGFzIHRoYXQgcmVhZHMgbGVzcyBjbGVhcmx5IHRvIG1lOgo+IAo+ IAlpZiAoV0FSTl9PTl9PTkNFKHZtYV9mbGFnc19jYW5fbWVyZ2UoJmRlc2MtPnZtYV9mbGFncykg JiYKPiAJCQkgZGVzYy0+YWN0aW9uLnR5cGUgIT0gTU1BUF9OT1RISU5HKSkKPiAKPiBBbmQgdGhp cyB2ZXJzaW9uIGhpZ2hsaWdodHMgd2hhdCBpcyB0aGUgYnJva2VuIHRoaW5nIGhlcmUgKGFjdGlv biB0eXBlIHNldCkgYQo+IGxpdHRsZSBtb3JlIGNsZWFybHkgdGhvdWdoIG9idmlvdXNseSB0aGF0 J3Mgb25seSBpZiBtZXJnZWFibGUgc28gYXJndWFibGUuCj4gCj4gSSBkb24ndCBoYXZlIGEgcmVh bGx5IHN0cm9uZyBvcGluaW9uIHRob3VnaCBJIGNhbiBjaGFuZ2UgaXQgaWYgeW91IHByZWZlcj8K Ckxvb2tzIGNsZWFyZXIgdG8gbWUgbGlrZSB0aGF0CgpBY2tlZC1ieTogRGF2aWQgSGlsZGVuYnJh bmQgKEFybSkgPGRhdmlkQGtlcm5lbC5vcmc+CgotLSAKQ2hlZXJzLAoKRGF2aWQKCi0tIAprdm0t cmlzY3YgbWFpbGluZyBsaXN0Cmt2bS1yaXNjdkBsaXN0cy5pbmZyYWRlYWQub3JnCmh0dHA6Ly9s aXN0cy5pbmZyYWRlYWQub3JnL21haWxtYW4vbGlzdGluZm8va3ZtLXJpc2N2Cg==