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 846FECA5FD4 for ; Fri, 2 Oct 2026 06:58:12 +0000 (UTC) Received: by kanga.kvack.org (Postfix) id 805F26B0095; Fri, 2 Oct 2026 02:58:11 -0400 (EDT) Received: by kanga.kvack.org (Postfix, from userid 40) id 7B6C76B0096; Fri, 2 Oct 2026 02:58:11 -0400 (EDT) X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id 67EF76B0098; Fri, 2 Oct 2026 02:58:11 -0400 (EDT) X-Delivered-To: linux-mm@kvack.org Received: from relay.hostedemail.com (smtprelay0011.hostedemail.com [216.40.44.11]) by kanga.kvack.org (Postfix) with ESMTP id 38DE56B0095 for ; Fri, 2 Oct 2026 02:58:11 -0400 (EDT) Received: from smtpin09.hostedemail.com (lb01a-stub [10.200.18.249]) by unirelay04.hostedemail.com (Postfix) with ESMTP id B27891A0615 for ; Fri, 2 Oct 2026 06:58:10 +0000 (UTC) X-FDA: 85276781940.09.5F70694 Received: from sea.source.kernel.org (sea.source.kernel.org [172.234.252.31]) by imf04.hostedemail.com (Postfix) with ESMTP id C4C7A40009 for ; Fri, 2 Oct 2026 06:58:08 +0000 (UTC) Authentication-Results: imf04.hostedemail.com; dkim=pass header.d=kernel.org header.s=k20260515 header.b=QZEml77Q; spf=pass (imf04.hostedemail.com: domain of david@kernel.org designates 172.234.252.31 as permitted sender) smtp.mailfrom=david@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=1790924288; 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=Fu3Iu/gEhueAyG3mvEvskapgxrTQuPV0qPl2NW4TdO0=; b=jHfjGsUYuxxGqOfpPiZbyUuN6zdsTYIVVtODConfTTOyzUXPOLAjW8+aradHLZqMmtLkL9 ZK1HmI2dNq03IxmBCDX8COmGfJ3ORCCZHVWhLlZYXUe0n3TGNcuazrAn6mxQv9cNnaW18w UjLBSXLu67sb7M22sMWyAmVRRJydprs= ARC-Seal: i=1; a=rsa-sha256; d=hostedemail.com; s=arc-20220608; cv=none; t=1790924288; b=ikQ+NuUU6fxfKqc0FXO262zKhRJrfxR8J5X9GL1VXr6YuUIijwJPEUehvpRmNrkDnS7fq2 sbX3Tp4B+ra/ZgvYdIzfZFu9djDBQPmHLTv8K0oOYBoQUKDhx8HG1dF8U4fZP1W9XDHYCo CPGWE8s1v+kMz4rE9gJ+0SS9MAztloA= ARC-Authentication-Results: i=1; imf04.hostedemail.com; dkim=pass header.d=kernel.org header.s=k20260515 header.b=QZEml77Q; spf=pass (imf04.hostedemail.com: domain of david@kernel.org designates 172.234.252.31 as permitted sender) smtp.mailfrom=david@kernel.org; dmarc=pass (policy=quarantine) header.from=kernel.org Received: from smtp.kernel.org (quasi.space.kernel.org [100.103.45.18]) by sea.source.kernel.org (Postfix) with ESMTP id 00145403C9; Fri, 2 Oct 2026 06:58:08 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 45A201F000FF; Fri, 2 Oct 2026 06:57:27 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=kernel.org; s=k20260515; t=1790924287; bh=Fu3Iu/gEhueAyG3mvEvskapgxrTQuPV0qPl2NW4TdO0=; h=Date:Subject:To:Cc:References:From:In-Reply-To; b=QZEml77Q9r2sTAkkCtBoHvaT+mj+1tDODZUrLGqwvtSwG246NM65eA1dzYWxf7YW8 FsZHsJ5bHXSNrjOMhjIn7vxhTfqBxb5BbIaCq3FhBRTvTnT4cgJaMPpemcORNqu7us KZ5vOERy+jet9qfghjrMSxipKIy8nSINWZMt8JI0W/EcqAmuf1XL8JBjreMbrM0wcX Ag2ygVqLrNx0bed/Uo3rgTOX0dyCxzypBaFxKiNkqAIo5H6yaLty1QyOMTBxvr6K3J 7fZhyvWOcYx5fyoMuZSOY9MxO7T8zpbMzKLeD7GAZRKRiD63ibsiIJtYCY3a/tMxPp zCope7IsHy9eg== Message-ID: Date: Fri, 2 Oct 2026 08:57:25 +0200 MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH v3 30/40] mm/madvise: update is_valid_guard_vma() to use vma_can_merge() To: "Lorenzo Stoakes (ARM)" , Andrew Morton , "Liam R. 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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-v3-30-4583d8a23bca@kernel.org> From: "David Hildenbrand (Arm)" Content-Language: en-US Autocrypt: addr=david@kernel.org; keydata= xsFNBFXLn5EBEAC+zYvAFJxCBY9Tr1xZgcESmxVNI/0ffzE/ZQOiHJl6mGkmA1R7/uUpiCjJ dBrn+lhhOYjjNefFQou6478faXE6o2AhmebqT4KiQoUQFV4R7y1KMEKoSyy8hQaK1umALTdL QZLQMzNE74ap+GDK0wnacPQFpcG1AE9RMq3aeErY5tujekBS32jfC/7AnH7I0v1v1TbbK3Gp XNeiN4QroO+5qaSr0ID2sz5jtBLRb15RMre27E1ImpaIv2Jw8NJgW0k/D1RyKCwaTsgRdwuK Kx/Y91XuSBdz0uOyU/S8kM1+ag0wvsGlpBVxRR/xw/E8M7TEwuCZQArqqTCmkG6HGcXFT0V9 PXFNNgV5jXMQRwU0O/ztJIQqsE5LsUomE//bLwzj9IVsaQpKDqW6TAPjcdBDPLHvriq7kGjt WhVhdl0qEYB8lkBEU7V2Yb+SYhmhpDrti9Fq1EsmhiHSkxJcGREoMK/63r9WLZYI3+4W2rAc UucZa4OT27U5ZISjNg3Ev0rxU5UH2/pT4wJCfxwocmqaRr6UYmrtZmND89X0KigoFD/XSeVv jwBRNjPAubK9/k5NoRrYqztM9W6sJqrH8+UWZ1Idd/DdmogJh0gNC0+N42Za9yBRURfIdKSb 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bWorfCGKLvMoyDeVBiZMJYM/bXwxeH7Lf6N6qxKZVX4o4b/NTIshpuSKH54oaCGySyie3nnRdwqNtI97ksQn+Qfonm4Av6E9WR1hRlFwLBTC2ZGI8ANPbgjyG18Q4Mfvd7jcXKqNt5yxToMqTr4r6nvAugwL8JMRRVHqmLZHiHGsVCC//I+UX/sqSjw7Ayj/1NesVAaJRXvmBLTOVDCTuQD9eSsI7hAziBrsAAeM8ZlqstwjS4UXxei2uWQ1J9LR2Wcr03tiMGT26tI1+ztJdFjonuiF4HcbiSmEuSEZpWAMSQ8wE6q3MEUUzVuQhDB556+zO+j28Yi2JKyKGVNHzhH22r4hQp3r08ge/iWH5br72zQLQNsZhs Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: On 9/17/26 18:22, Lorenzo Stoakes (ARM) wrote: > We currently disallow the installation of lightweight guard regions in VMAs > whose flags intersect VMA_SPECIAL_FLAGS or VMA_HUGETLB_BIT, or > VMA_LOCKED_BIT unless allow_locked is set. > > hugetlb VMAs set VMA_DONTEXPAND_BIT so this was already redundant, > VMA_SPECIAL_FLAGS already sufficed. > > However, now that VMA_IO_BIT is only set if VMA_PFNMAP or VMA_MIXEDMAP_BIT > is set, this check collapses to being the equivalent of > !vma_can_merge(). > > Update is_valid_guard_vma() to reflect this. > > No functional change intended. > > Signed-off-by: Lorenzo Stoakes (ARM) > --- > mm/madvise.c | 20 +++++++++++++------- > 1 file changed, 13 insertions(+), 7 deletions(-) > > diff --git a/mm/madvise.c b/mm/madvise.c > index 467601a8525b..0922d5f07a12 100644 > --- a/mm/madvise.c > +++ b/mm/madvise.c > @@ -1221,19 +1221,25 @@ static long madvise_remove(struct madvise_behavior *madv_behavior) > return error; > } > > -static bool is_valid_guard_vma(struct vm_area_struct *vma, bool allow_locked) > +static bool is_valid_guard_vma(const struct vm_area_struct *vma, > + bool allow_locked) > { > - vm_flags_t disallowed = VM_SPECIAL | VM_HUGETLB; > - > /* > - * A user could lock after setting a guard range but that's fine, as > + * A user could lock after setting a guard range but that's fine as > * they'd not be able to fault in. The issue arises when we try to zap > * existing locked VMAs. We don't want to do that. > */ > - if (!allow_locked) > - disallowed |= VM_LOCKED; > + if (!allow_locked && vma_test(vma, VMA_LOCKED_BIT)) > + return false; > + /* > + * Guard regions require a VMA whose page tables are managed solely by > + * the core, which is also what merging requires, so disallow any flags > + * that would prevent a merge. > + */ > + if (!vma_can_merge(vma)) > + return false; Acked-by: David Hildenbrand (Arm) -- Cheers, David