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bh=a+D9gXh0F6nzazsIjL+t3KKIMfQZuouUyEletwRwjM4=; h=Date:To:From:Subject; b=03lm4nNT+kAxkQQ5kCw108L6k1WeAOYD3p7yUthkmGiOaTTtqtv6V5ZneK1M1eVKb EFTH88lca4siOD/glgUGWOcr7kUPuBbCdyyGRGtrp4cPYgq53v6RPRecykX4vn8+/1 FXGVnaQxUdzSXX8Q6CK/PqmaBKS0ZdYoA6XW9w8M= Date: Sat, 24 Oct 2026 02:00:15 -0700 To: mm-commits@vger.kernel.org,ziy@nvidia.com,yuanchu@google.com,youngjun.park@lge.com,ying.huang@linux.alibaba.com,xu.xin@linux.dev,willy@infradead.org,will@kernel.org,weixugc@google.com,viro@zeniv.linux.org.uk,vincent.guittot@linaro.org,vbabka@kernel.org,usama.arif@linux.dev,tzimmermann@suse.de,tiwai@suse.com,tglx@kernel.org,surenb@google.com,stephen.smalley.work@gmail.com,sre@kernel.org,spasswolf@web.de,simona@ffwll.ch,shikemeng@huaweicloud.com,shakeel.butt@linux.dev,ryan.roberts@arm.com,rppt@kernel.org,riel@surriel.com,rakie.kim@sk.com,qi.zheng@linux.dev,pjw@kernel.org,pfalcato@suse.de,peterz@infradead.org,peterx@redhat.com,perex@perex.cz,paul@paul-moore.com,palmer@dabbelt.com,oupton@kernel.org,osalvador@suse.de,oleg@redhat.com,npiggin@gmail.com,nphamcs@gmail.com,nico.pache@linux.dev,namhyung@kernel.org,muchun.song@linux.dev,mripard@kernel.org,mkp@kernel.org,mingo@redhat.com,miklos@szeredi.hu,mhocko@suse.com,mhocko@kernel.org,mhiramat@kernel.org,memxor@gmail.com,maz@kernel.org,ma tthew.brost@intel.com,mark.rutland@arm.com,maddy@linux.ibm.com,maarten.lankhorst@linux.intel.com,liam@infradead.org,leon@kernel.org,lance.yang@linux.dev,kasong@tencent.com,kas@kernel.org,juri.lelli@redhat.com,joshua.hahnjy@gmail.com,jhubbard@nvidia.com,jgg@ziepe.ca,jannh@google.com,james.bottomley@hansenpartnership.com,jack@suse.cz,imbrenda@linux.ibm.com,ihor.solodrai@linux.dev,hca@linux.ibm.com,harry@kernel.org,hannes@cmpxchg.org,gregkh@linuxfoundation.org,gourry@gourry.net,gor@linux.ibm.com,gerald.schaefer@linux.ibm.com,frankja@linux.ibm.com,eddyz87@gmail.com,dgilbert@interlog.com,dev.jain@arm.com,dennis.dalessandro@cornelisnetworks.com,deller@gmx.de,david@kernel.org,davem@davemloft.net,dave.hansen@linux.intel.com,daniel@iogearbox.net,corbet@lwn.net,chrisl@kernel.org,chengming.zhou@linux.dev,catalin.marinas@arm.com,byungchul@sk.com,brauner@kernel.org,bp@alien8.de,borntraeger@linux.ibm.com,baoquan.he@linux.dev,baolin.wang@linux.alibaba.com,baohua@kernel.org,axelrasmussen@google.com ,ast@kernel.org,arnd@arndb.de,apopple@nvidia.com,aou@eecs.berkeley.edu,anup@brainfault.org,aneesh.kumar@kernel.org,andrii@kernel.org,andreas@gaisler.com,airlied@gmail.com,agordeev@linux.ibm.com,acme@kernel.org,ljs@kernel.org,akpm@linux-foundation.org From: Andrew Morton Subject: [merged mm-stable] mm-madvise-update-is_valid_guard_vma-to-use-vma_is_mm_backed.patch removed from -mm tree Message-Id: <20261024090015.E57941F01825@smtp.kernel.org> X-Mailing-List: mm-commits@vger.kernel.org List-Id: List-Post: List-Help: List-Subscribe: List-Unsubscribe: List-Owner: Precedence: list The quilt patch titled Subject: mm/madvise: update is_valid_guard_vma() to use vma_is_mm_backed() has been removed from the -mm tree. Its filename was mm-madvise-update-is_valid_guard_vma-to-use-vma_is_mm_backed.patch This patch was dropped because it was merged into the mm-stable branch of git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm ------------------------------------------------------ From: "Lorenzo Stoakes (ARM)" Subject: mm/madvise: update is_valid_guard_vma() to use vma_is_mm_backed() Date: Tue, 13 Oct 2026 16:05:11 +0100 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_is_mm_backed(), excluding hugetlb mappings in which guard markers cannot be installed. Update is_valid_guard_vma() to reflect this. No functional change intended. Link: https://lore.kernel.org/20261013-b4-mmap-prepare-vma-flag-sanify-v6-31-1aa3c9b139f9@kernel.org Signed-off-by: Lorenzo Stoakes (ARM) Signed-off-by: Andrew Morton Acked-by: Zi Yan Acked-by: David Hildenbrand (Arm) Cc: Liam R. Howlett Cc: Vlastimil Babka Cc: Jann Horn Cc: Pedro Falcato Cc: Mike Rapoport Cc: Suren Baghdasaryan Cc: Michal Hocko Cc: Jonathan Corbet Cc: Greg Kroah-Hartman Cc: Dennis Dalessandro Cc: Jason Gunthorpe Cc: Leon Romanovsky Cc: Paul Moore Cc: Stephen Smalley Cc: Jaroslav Kysela Cc: Takashi Iwai Cc: Alexei Starovoitov Cc: Daniel Borkmann Cc: Andrii Nakryiko Cc: Eduard Zingerman Cc: Kumar Kartikeya Dwivedi Cc: Baolin Wang Cc: Nico Pache Cc: Ryan Roberts Cc: Dev Jain Cc: Barry Song Cc: Lance Yang Cc: Usama Arif Cc: Kiryl Shutsemau Cc: Doug Gilbert Cc: James Bottomley Cc: Martin K. Petersen Cc: Simona Vetter Cc: Helge Deller Cc: Sebastian Reichel Cc: John Hubbard Cc: Peter Xu Cc: Masami Hiramatsu Cc: Oleg Nesterov Cc: Peter Zijlstra Cc: Thomas Gleixner Cc: Ingo Molnar Cc: Borislav Petkov Cc: Dave Hansen Cc: Arnaldo Carvalho de Melo Cc: Namhyung Kim Cc: Mark Rutland Cc: Rik van Riel Cc: Harry Yoo Cc: Juri Lelli Cc: Vincent Guittot Cc: Maarten Lankhorst Cc: Maxime Ripard Cc: Thomas Zimmermann Cc: David Airlie Cc: Will Deacon Cc: Aneesh Kumar K.V Cc: Nicholas Piggin Cc: Arnd Bergmann Cc: Muchun Song Cc: Oscar Salvador Cc: Matthew Wilcox (Oracle) Cc: Jan Kara Cc: Marc Zyngier Cc: Oliver Upton Cc: Catalin Marinas Cc: Madhavan Srinivasan Cc: Anup Patel Cc: Paul Walmsley Cc: Palmer Dabbelt Cc: Albert Ou Cc: Christian Borntraeger Cc: Janosch Frank Cc: Claudio Imbrenda Cc: Alexander Gordeev Cc: Gerald Schaefer Cc: Heiko Carstens Cc: Vasily Gorbik Cc: David S. Miller Cc: Andreas Larsson Cc: Al Viro Cc: Christian Brauner Cc: Matthew Brost Cc: Joshua Hahn Cc: Rakie Kim Cc: Byungchul Park Cc: Gregory Price Cc: Ying Huang Cc: Alistair Popple Cc: Chris Li Cc: Kairui Song Cc: Kemeng Shi Cc: Nhat Pham Cc: Baoquan He Cc: Youngjun Park Cc: Johannes Weiner Cc: Qi Zheng Cc: Shakeel Butt Cc: Axel Rasmussen Cc: Yuanchu Xie Cc: Wei Xu Cc: Chengming Zhou Cc: Michal Hocko Cc: Miklos Szeredi Cc: Xu Xin Cc: Ihor Solodrai Cc: Bert Karwatzki --- mm/madvise.c | 20 +++++++++++++------- 1 file changed, 13 insertions(+), 7 deletions(-) --- a/mm/madvise.c~mm-madvise-update-is_valid_guard_vma-to-use-vma_is_mm_backed +++ a/mm/madvise.c @@ -1057,19 +1057,25 @@ static long madvise_remove(struct madvis 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 + * core mm, so the VMA must be mm-backed (excluding hugetlb, in which + * guard markers cannot be installed). + */ + if (!vma_is_mm_backed(vma) || vma_is_hugetlb(vma)) + return false; - return !(vma->vm_flags & disallowed); + return true; } static bool is_guard_pte_marker(pte_t ptent) _ Patches currently in -mm which might be from ljs@kernel.org are mm-vma-fix-expansion-of-vma_mixedmap_bit-vmas.patch mm-do-not-unintentionally-overwrite-atomic-vma-flags.patch mm-vma-avoid-losing-atomic-vma-flags-when-setting-sticky-vma-flags.patch