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h=Date:From:To:Cc:Subject:References:In-Reply-To:From; b=hc95gwYr4hlRyW/o5zs0jyhfOGs74Do+ch0sJPW5V5HxppF6ribgfdRKL5l+Ph1qM divMRR/TWoxxKhidxaYV5/bLcdzmWWzi7zrZ3SsmUbA2ws9BGJeDnbCnPVa+mkE9Qm v0KvihGVOgmtbN05Kl4GX9PpZb6J8aJNpWqTJH9I= Date: Tue, 27 Oct 2026 10:55:29 +0000 From: Catalin Marinas To: Hungyu Lin Cc: akpm@linux-foundation.org, david@kernel.org, ziy@nvidia.com, matthew.brost@intel.com, joshua.hahnjy@gmail.com, byungchul@sk.com, gourry@gourry.net, ying.huang@linux.alibaba.com, apopple@nvidia.com, andreyknvl@gmail.com, vincenzo.frascino@arm.com, odys.yuan@gmail.com, sashiko-bot@kernel.org, linux-mm@kvack.org, linux-kernel@vger.kernel.org, stable@vger.kernel.org Subject: Re: [PATCH v2] mm/migrate: untag addresses when querying page nodes Message-ID: References: <20261026195330.46757-1-dennylin0707@gmail.com> X-Archived-By: MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20261026195330.46757-1-dennylin0707@gmail.com> X-Rspamd-Server: rspam12 X-Rspamd-Queue-Id: 1918CC000B X-Stat-Signature: h465f1mnnxohdfo48if19kx44fkayswb X-Spam-Status: No, score=-10.8 required=3.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_CR_TRAILER,MAILING_LIST_MULTI,SPF_HELO_PASS,SPF_PASS autolearn=ham autolearn_force=no version=4.0.1 X-Rspam-User: X-HE-Tag: 1793098534-808208 X-HE-Meta: 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 JepUnjV0 pBw9caQmuSZ+c0V3IbqBG/vwavJoIr/gipmB/0h3jNFQ9G0smt28JQ9j536E759kefgcXpFB7+wmDfCmcxmmMm4zAIsSjxyLPgiEOYV5MUY4rvQObCf93sekQBpgzz5Pmo8s3uxUNADSswQvlLQKF2AQfdByOrf6A7D6HwgV8qhZkJ1F11zgWNaSI0ZSLdDYocvJraP4XHj1lTr8X6oFaPeOl9vLqt4vbud0JzB3KejjClKfVUxdvvQZd/z9Iew2u0XP5hs+e1CbjRuNlAGgkagfojXT28X9PAb2h+7xTDHrRQHxd6gCgMW1zxGyu9EsweDTUWUYegW3B3NRDWmfFNIZacV5PsCvQu7+xyNQ4AZiKks5Z3YRlbOmYy3fdna9RNErCdFENv7qPlGAiNm8sTd7WV7ddSRKvpHandssNG/kk33DdLid98Cp+BQ== Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: X-Spam-Checker-Version: SpamAssassin 4.0.1 (2024-03-26) on aws-us-west-2-korg-listserv-alma10-1 On Mon, Oct 26, 2026 at 07:53:29PM +0000, Hungyu Lin wrote: > When move_pages() is used with nodes == NULL, do_pages_stat_array() > passes each page address directly to vma_lookup(). A valid tagged address > therefore fails the VMA lookup and gets -EFAULT in its status entry, > instead of the node reported for the corresponding untagged address. > > The tagged address ABI permits these pointers, and the migration path > already removes their tags. Apply the target mm's untagging rules to > the query path as well, while holding its mmap read lock. > > Fixes: 057d3389108e ("mm: untag user pointers passed to memory syscalls") > Reported-by: Sashiko > Closes: https://lore.kernel.org/r/20260721183257.706661F000E9@smtp.kernel.org > Cc: stable@vger.kernel.org > Signed-off-by: Hungyu Lin > Acked-by: Zi Yan > Acked-by: David Hildenbrand (Arm) Reviewed-by: Catalin Marinas