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Howlett" , Vlastimil Babka , Mike Rapoport , Suren Baghdasaryan , Michal Hocko , Kees Cook , Peter Zijlstra , Jann Horn , Hugh Dickins , Pasha Tatashin , Pratyush Yadav , "Matthew Wilcox (Oracle)" , Jan Kara , Zi Yan , Lance Yang , Rik van Riel , Harry Yoo , Alistair Popple , Nico Pache , Ryan Roberts , Dev Jain , Usama Arif , Kiryl Shutsemau , Matthew Brost , John Hubbard , Peter Xu , Will Deacon , "Aneesh Kumar K.V" , Nick Piggin , Oscar Salvador , Minchan Kim , Muchun Song , Xu Xin , Chengming Zhou , Chris Li , Kemeng Shi , Nhat Pham , Youngjun Park , Gregory Price , Joshua Hahn , Rakie Kim , Ying Huang , Jason Gunthorpe , linux-mm@kvack.org, linux-kernel@vger.kernel.org, kexec@lists.infradead.org, linux-fsdevel@vger.kernel.org, linux-arch@vger.kernel.org, linux-cxl@vger.kernel.org, Josef Bacik Subject: Re: [PATCH 46/46] fs/proc/task_mmu: refuse addresses beyond 32 bits on 32bit Message-ID: References: <20261027-fixes_core-v1-0-6f74bec9a5bb@kernel.org> <20261027-fixes_core-v1-46-6f74bec9a5bb@kernel.org> X-Archived-By: MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20261027-fixes_core-v1-46-6f74bec9a5bb@kernel.org> X-Spam-Level: X-Rspamd-Action: no action X-Spam-Score: -12.01 X-Rspamd-Queue-Id: E2DF340007 X-Rspam-User: X-Stat-Signature: ukegcn9dma1nggjq8hxo1xnooph37hy6 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-Rspamd-Server: rspam03 X-HE-Tag: 1793117634-545964 X-HE-Meta: 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 FBaIU45K c7XMyh56R+RyyLA8R6OQ+g1cwc0WZsYadKMChd3NQSxoJfdRGQoadWtHNnuHLK1nF6H6eEBpV9IikP4Aun5csfPaDwlHiqmmKrKpfIzfvng8nXs7v+HSLfda2GXvup3Vy8tve9MNKfii8LTmYGE8WrX/GH1Ds3io5x+L8p9VsXe0aWcbnRsA2U/7+XhaC/masPROq2W/bIldi0kSAgmINS+NmJTyhDj6Bnx9h/RlGOY66Z2xI24YsqKJ1F5a3VoX0j2ozpuJZQ/h2Ab0Io3Q6Kj95SRjfBj3BaNyQxqM5K3fB6010UDraUVvR2LiM4b0VVny7KdH1/p9t3KwNyDaEnZHipCFMRLqjiBqDCOOfaidu0X6nTb2TJFCz5q8Jbkl7Gn2ZGXE87eObkjjrOFraD2/PzAFINd26fzKIeSk+55YX6JeFr9ccJB97rhFqK6J+2aNUnreTfZ+zntDWOG50OncWnA== 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 Tue, Oct 27, 2026 at 12:18:06AM +0100, David Hildenbrand (Arm) wrote: > From: Josef Bacik > > The addresses in struct pm_scan_arg are 64 bits wide. The first thing > pagemap_scan_get_args() does with them is to cast them to unsigned > long. On a 32-bit kernel the upper half is dropped without a word: > PAGEMAP_SCAN of 0x100001000-0x100002000 scans, and with > PM_SCAN_WP_MATCHING write-protects, 0x1000-0x2000, stores the result > at the lower half of vec, and reports success. > > Return -EFAULT, as for other addresses outside of the address space. > > This is probably not worth CCing stable. > > Fix generated by an LLM and sent by Josef Bacik in private. > > Fixes: 52526ca7fdb9 ("fs/proc/task_mmu: implement IOCTL to get and optionally clear info about PTEs") > Signed-off-by: Josef Bacik > Acked-by: Lorenzo Stoakes (ARM) > Signed-off-by: David Hildenbrand (Arm) Reviewed-by: Pedro Falcato -- Pedro