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b=Ly97WAR+7t3TUBYbtBXG5Cl67uFMpHyxMsFbLGuvN5TOlpDssYVm+ROFpJ1jXEx7X ZSVu/tZJkNZYNEq/tNneRpJccolHlGTp9S4vx3GVjn2/FNkgsCXYdQG5iZMEI5WFXl 3mP10XHD6ijiDaqDnzVxtMQJsB6Vbss2NHY8wueWSW0A4VBpLtyAXkTalv65owI12W L+oHhJCSqpeFhUPm8xUPkkMDRHBMyLHFgPI1NVzdKflm+AsGcFjPxkKJnWoLronuqz dZpEgFrZbp5x/WuzYkdFcaz0SZzqxdTOcG2isnCCPywHopb4n72oi44Xn434DWz6DN dllmYfOoQ0ukw== Message-ID: <29919c80-7901-43ea-97f9-6b74c7e73965@kernel.org> Date: Mon, 26 Oct 2026 10:58:08 +0100 X-Archived-By: MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH] mm/migrate: untag addresses when querying page nodes To: Hungyu Lin , akpm@linux-foundation.org Cc: 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, catalin.marinas@arm.com, vincenzo.frascino@arm.com, khalid.aziz@oracle.com, odys.yuan@gmail.com, sashiko-bot@kernel.org, linux-mm@kvack.org, linux-kernel@vger.kernel.org, stable@vger.kernel.org References: <20261025223226.33740-1-dennylin0707@gmail.com> From: "David Hildenbrand (Arm)" Content-Language: en-US Autocrypt: addr=david@kernel.org; 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charset=UTF-8 Content-Transfer-Encoding: 7bit X-Rspamd-Queue-Id: 0218720002 X-Rspam-User: X-Stat-Signature: tca7qpcat9tfxrs3fcorghx66ggwj35p X-Spam-Status: No, score=-12.6 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_CR_TRAILER,MAILING_LIST_MULTI,SPF_HELO_PASS,SPF_PASS, USER_AGENT_SANE_1 autolearn=ham autolearn_force=no version=4.0.1 X-Rspamd-Server: rspam03 X-HE-Tag: 1793008697-301500 X-HE-Meta: U2FsdGVkX18y+GuROO3SB687UQICILfgZWKwWgkOryeXmrWD3g/37Oz7DWS+vwHR+JAYB8QGK75I8kvrPogp6wVGJg/l/mdu5JdkG4uBZhl3szUaAINjgDqqphXVAMCZkt88kL+322cjCTq03yLXTkh56SLOS376W4usWFtmBGuPV47xE85oZPkFvtSag5oChWKWpayNY/Zn1WoiqXBcJMxQJGipYmrmm6JoV6cFUBM8uzb8nWlktjTtcLtT5sV+GsRibKPOQJAAacYFJC9jHCSi1+2MLKExEoL8BADjFWgjx7V3xsB69u/cHqhgEcC2VSotI7vpQm2uZ9UI1z6rucSmrhFiSaeORQjE4n1LkZcDmQbAA2aEgyFLT/NwfBtUHqNRrjY3l3sP6vDE7wt2rAdqoFecO6HmHFA/ug27UY3YxlrYvM/RXFrLnyFMZEwI0RsomYy+dRPy88U4jyTi9oCklVNVWWXROlY86uRf5hgm01QWxZd+gjqTI2r+qUbJwmEjcCZ15DO1KcCsqaA0fUySToPma1S8w57kifoYKesi/GkinphtwSk3xAy+OCCzJE8LZJoMq8lAN5QcC8/xouLblbxR7/5fA+zEdpA7AEuataZh2WRMBAkzQ5sCakHbsetMBqQUKggqWqYDJO641YTw6B/siHTmXh/54+FrPupIkoY0N0s25KpaNmqe18NxMmjWQsnxQ8QS9W+yH2qvDwbO61yEkydzl/MG4igrii221fo4RuA0JPaP3bmt1Thy5rB98+BOEwS4x52rB7C9YuWQ8Gs6VLaTfmrbMlR2YpiglLOvWnVJp71kVk/hwvpb6M9kdn3lMHMaoD4gC0OTUVgW5/hOqNHsT0Zt0LqKJS1xe33RWb82IMbGyj8QXncU14vmmXxNhK0LvISx2w9AYFjOOrxY+idB9yy7mWh3BfcvMgYzrTZRn8xVT6U+zsLX6YzMTsDw8gUMyfhDM2Q WTIYdKnb EwE5vVNEoTI7MeuqfFyJlvQMlp1eu+TM+/4I+NU48gKsmFALscPp8o1wsnKcCH8LxJ/yY2/xVWyQMPn6hHm9ENf9WEmEa9XWiBDW7HrRhhNUaaDqkpS1PrZ6F/TYPPNYLWlBdHOWRTsPIiAO1jj+vGSP0Eydt0IIC0lSGIr1Ay5OS+Peb3jdnh/khMU3xQ8kVNC27PHzJKSOzBo8+jn3neINYRJRMazxg0OWvhoofj9K1eI3fqUq3Vq7dGHNHQgYQJeSDs/VLG2Yug1kZeL+m+u2GTe4XWT/kz2S3vuPBzrKJol1UUNrIoFJA4qObZKs3Kq5ElusYxVPYw5TLgVFXeQktGp4dKkOToTk23cuIXq/q2yzqa/7GcW1Lu+OvEGS1zkwC 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 10/25/26 23:32, 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 > Link: https://lore.kernel.org/r/20260721183257.706661F000E9@smtp.kernel.org > Cc: stable@vger.kernel.org > Signed-off-by: Hungyu Lin > --- Acked-by: David Hildenbrand (Arm) -- Cheers, David