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From: Muchun Song <muchun.song@linux.dev>
To: "David Hildenbrand (Arm)" <david@kernel.org>
Cc: Andrew Morton <akpm@linux-foundation.org>,
	"Liam R. Howlett" <liam@infradead.org>,
	Lorenzo Stoakes <ljs@kernel.org>,
	Vlastimil Babka <vbabka@kernel.org>, Jann Horn <jannh@google.com>,
	Pedro Falcato <pfalcato@suse.de>,
	Oscar Salvador <osalvador@suse.de>,
	Miaohe Lin <linmiaohe@huawei.com>,
	Naoya Horiguchi <nao.horiguchi@gmail.com>,
	Adam Litke <agl@us.ibm.com>, Mel Gorman <mel@csn.ul.ie>,
	Rik van Riel <riel@surriel.com>, Peter Xu <peterx@redhat.com>,
	"Kiryl Shutsemau (Meta)" <kas@kernel.org>,
	"Mike Rapoport (Microsoft)" <rppt@kernel.org>,
	Josef Bacik <josef@toxicpanda.com>,
	linux-mm@kvack.org, linux-kernel@vger.kernel.org,
	stable@vger.kernel.org
Subject: Re: [PATCH 03/10] mm/hugetlb: fix use-after-free in hugetlb_mfill_atomic_pte()
Date: Fri, 16 Oct 2026 15:18:21 +0800	[thread overview]
Message-ID: <921D5002-91A9-4FA1-83DD-A7D2D061628C@linux.dev> (raw)
In-Reply-To: <20261015-urgent_fixes-v1-3-42796911043b@kernel.org>



> On Oct 16, 2026, at 00:07, David Hildenbrand (Arm) <david@kernel.org> wrote:
> 
> Let's fix another instance where we use a folio after dropping the PTL,
> where someone else could e.g., MADV_DONTNEED it once we drop the PTL,
> making us trigger a use-after-free on the folio.
> 
> Fixes: cb6acd01e2e4 ("hugetlbfs: fix races and page leaks during migration")
> Fixes: 1c9e8def43a3 ("userfaultfd: hugetlbfs: add UFFDIO_COPY support for shared mappings")
> Cc: stable@vger.kernel.org
> Reported-by: Lorenzo Stoakes (ARM) <ljs@kernel.org>
> Reviewed-by: Lorenzo Stoakes (ARM) <ljs@kernel.org>
> Signed-off-by: David Hildenbrand (Arm) <david@kernel.org>

Acked-by: Muchun Song <muchun.song@linux.dev>

Thanks.


  reply	other threads:[~2026-10-16  7:18 UTC|newest]

Thread overview: 25+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2026-10-15 16:07 [PATCH 00/10] mm: various (urgent?) fixes David Hildenbrand (Arm)
2026-10-15 16:07 ` [PATCH 01/10] mm/vma: don't leak the commit charge on mmap failure David Hildenbrand (Arm)
2026-10-15 17:54   ` Pedro Falcato
2026-10-15 18:53     ` David Hildenbrand (Arm)
2026-10-16  8:34   ` Jose A. Perez de Azpillaga
2026-10-15 16:07 ` [PATCH 02/10] mm/hugetlb: fix use-after-free of a new anon folio David Hildenbrand (Arm)
2026-10-16  7:16   ` Muchun Song
2026-10-15 16:07 ` [PATCH 03/10] mm/hugetlb: fix use-after-free in hugetlb_mfill_atomic_pte() David Hildenbrand (Arm)
2026-10-16  7:18   ` Muchun Song [this message]
2026-10-15 16:07 ` [PATCH 04/10] mm/hugetlb: unmap the page where the other VMA maps it David Hildenbrand (Arm)
2026-10-16  9:49   ` Muchun Song
2026-10-15 16:07 ` [PATCH 05/10] mm/hugetlb: don't clear the resv_map of a VMA whose lock is held David Hildenbrand (Arm)
2026-10-16  9:52   ` Muchun Song
2026-10-15 16:07 ` [PATCH 06/10] mm/hugetlb: fix endless write fault on a leftover uffd bit David Hildenbrand (Arm)
2026-10-15 20:10   ` Lorenzo Stoakes (ARM)
2026-10-15 16:07 ` [PATCH 07/10] mm/hugetlb: tolerate uffd bits set without uffd for PROT_NONE PTEs David Hildenbrand (Arm)
2026-10-15 20:13   ` Lorenzo Stoakes (ARM)
2026-10-15 16:07 ` [PATCH 08/10] mm/hugetlb: tolerate UFFD_WP markers outside uffd-wp VMAs David Hildenbrand (Arm)
2026-10-15 19:47   ` Lorenzo Stoakes (ARM)
2026-10-15 16:07 ` [PATCH 09/10] mm/hugetlb: don't leave a uffd-wp marker when zapping an RWP entry David Hildenbrand (Arm)
2026-10-15 19:45   ` Lorenzo Stoakes (ARM)
2026-10-15 16:07 ` [PATCH 10/10] mm/mremap: fix calling fixup_hugetlb_reservations() on the wrong VMA David Hildenbrand (Arm)
2026-10-16  9:53   ` Muchun Song
2026-10-16  7:15 ` [PATCH 00/10] mm: various (urgent?) fixes Muchun Song
2026-10-16  7:40   ` David Hildenbrand (Arm)

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