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[PATCH v4 2/4] mm/truncate: look up the end-edge straddler by index Cc: , , , , , , , , , , , , , , , , , , , , , , , To: "Zhang Yi" , From: "Zi Yan" X-Mailer: aerc 0.22.0 References: <20260922110703.468389-1-yi.zhang@huaweicloud.com> <20260922110703.468389-3-yi.zhang@huaweicloud.com> In-Reply-To: <20260922110703.468389-3-yi.zhang@huaweicloud.com> X-ClientProxiedBy: CY5PR13CA0036.namprd13.prod.outlook.com (2603:10b6:930:11::21) To IA0PR12MB8374.namprd12.prod.outlook.com (2603:10b6:208:40e::7) MIME-Version: 1.0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: IA0PR12MB8374:EE_|PH7PR12MB6935:EE_ X-MS-Office365-Filtering-Correlation-Id: 6dcc4889-60cd-4e1b-e764-08df18be760b X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0;ARA:13230040|366016|23010399003|7416014|376014|1800799024|56012099006|6133799003|10067099003|11063799006|4143699003|18002099003|22082099003; X-Microsoft-Antispam-Message-Info: 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X-Rspamd-Queue-Id: 7057640016 X-Rspam-User: X-Stat-Signature: ywu3od46t9uqqqni58jcb1uxb4az33dc X-HE-Tag: 1790091049-736910 X-HE-Meta: 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 2cK2ZIRL 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 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: On Tue Sep 22, 2026 at 7:07 AM EDT, Zhang Yi wrote: > From: Zhang Yi > > In truncate_inode_partial_folio(), after the first split at the start > edge, folio_split() unlocks and drops the refcount of the after-split > sub-folios. The sub-folio straddling the end of the truncation range is > therefore unlocked and only transiently ref'd in the page cache while > the code still derives it from a page pointer inside the original folio. > > Between the first split finishing and page_folio() resolving split_at2, > that tail page can be reclaimed, freed and reallocated as a new large > folio in the same mapping at a different file offset. folio2 then points > at a folio that does not cover the end boundary, yet > folio2->mapping =3D=3D folio->mapping still holds, so the stale pointer > passes the mapping check and folio_split_or_unmap() splits a folio at a > wrong position (or, with a transient refcount, a use-after-free window > opens between try_get and the split). __folio_split()'s own > folio !=3D page_folio(split_at) check cannot catch this either since > split_at2 has been reallocated as part of the new folio, so > page_folio(split_at2) resolves back to folio2. > > Look the straddler up by its page index instead. __filemap_get_folio() > returns the folio currently covering the boundary, ref'd and locked, > with the mapping validated under the lock, so the split target is always > the real folio at the end edge. > > Reported-by: Sashiko > Link: https://sashiko.dev/#/message/20260916094500.C30061F00893%40smtp.ke= rnel.org > Link: https://lore.kernel.org/linux-mm/DLGXT0ERY79Z.3C5DYVJVX6S9Z@nvidia.= com/ > Fixes: 7460b470a131 ("mm/truncate: use folio_split() in truncate operatio= n") > Cc: stable@vger.kernel.org > Suggested-by: Jan Kara > Suggested-by: Zi Yan > Signed-off-by: Zhang Yi > --- > mm/truncate.c | 30 ++++++++++++++++-------------- > 1 file changed, 16 insertions(+), 14 deletions(-) > Thanks. Acked-by: Zi Yan --=20 Best Regards, Yan, Zi