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AJvYcCXt+6ID8TvUtkukMRiFxPyb+t+KQbfnwTgXc2VNw5M2IXgR9i+t9OZ7M7brDdBYO0ayQQ+wF10Rxw==@kvack.org X-Gm-Message-State: AOJu0YwVlpYqVnxNGhvPV33Vn2kQfbgxXuYxDg/iYYozj6zLNBiObT2l ZP95BIP9BSvYRyZvOzmknkPRb5dFwVfl2wN3BVOUpYQzLO1+sN3Kgh/LypsTN3YZq08T9cCp0wP j6UWL1/rGyeBbZXoQHA== X-Received: from wmbgy21.prod.google.com ([2002:a05:600c:8815:b0:480:4a03:7b5a]) (user=aliceryhl job=prod-delivery.src-stubby-dispatcher) by 2002:a05:600c:4513:b0:47d:18b0:bb9a with SMTP id 5b1f17b1804b1-4830e97a05bmr85132145e9.33.1770293963417; Thu, 05 Feb 2026 04:19:23 -0800 (PST) Date: Thu, 5 Feb 2026 12:19:22 +0000 In-Reply-To: <8856c839-1a94-4e4d-9ded-d3b1627cd2cc@kernel.org> Mime-Version: 1.0 References: <20260205-binder-tristate-v1-0-dfc947c35d35@google.com> <20260205-binder-tristate-v1-3-dfc947c35d35@google.com> <02801464-f4cb-4e38-8269-f8b9cf0a5965@lucifer.local> <21d90844-1cb1-46ab-a2bb-62f2478b7dfb@kernel.org> <8856c839-1a94-4e4d-9ded-d3b1627cd2cc@kernel.org> Message-ID: Subject: Re: [PATCH 3/5] mm: export zap_page_range_single and list_lru_add/del From: Alice Ryhl To: "David Hildenbrand (arm)" Cc: Lorenzo Stoakes , Greg Kroah-Hartman , Carlos Llamas , Alexander Viro , Christian Brauner , Jan Kara , Paul Moore , James Morris , "Serge E. Hallyn" , Andrew Morton , Dave Chinner , Qi Zheng , Roman Gushchin , Muchun Song , "Liam R. Howlett" , Vlastimil Babka , Mike Rapoport , Suren Baghdasaryan , Michal Hocko , Miguel Ojeda , Boqun Feng , Gary Guo , "=?utf-8?B?QmrDtnJu?= Roy Baron" , Benno Lossin , Andreas Hindborg , Trevor Gross , Danilo Krummrich , kernel-team@android.com, linux-fsdevel@vger.kernel.org, linux-kernel@vger.kernel.org, linux-security-module@vger.kernel.org, linux-mm@kvack.org, rust-for-linux@vger.kernel.org Content-Type: text/plain; charset="utf-8" X-Rspamd-Server: rspam11 X-Stat-Signature: urza8exi7toki7t9bode3za3c59i4m3z X-Rspam-User: X-Rspamd-Queue-Id: F19D04000E X-HE-Tag: 1770293964-36388 X-HE-Meta: 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 x7KlfAfm Tph8DkMHpWFVvLUlttEln/8TpDXbuQyvslfb3bs8HhbFKIOwP4Ce6G65Muna7h5KM7Nnu9W8whwnYC5Z7y+ZIov+NaTkVCf2x9RpxC9e9+kZi/wCF89QIynLE0tqz8ivxooqiBMwbl9JIO5mxXq31Cv+DFPAjOTLoKo3rFcMEu4y8NLxZW+UwYA68RJQuyE97OwdcBKhaRKE94NT7/S0cYUhEVBq0zWUgwqhss2JMiVRHUkshPh78w3c5wRic2eL+QB22LNEtleWl2A3oNa+kH46ElzT7SG/SWH7iLgVAt9nJ2I3hW+X5NToHpuUh0zG2Z13Nmr4w29aZjMKTC9h9sT6gcBCYVe8KnA3oQveTeJj1HQkNXTGX/mc6UBlRq6Mof1IFyrupe+f5nMK50ZFGNfPsCYRGDOAzWuXMF/HTimku1tpWQ9sBrIE6sA== X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: On Thu, Feb 05, 2026 at 01:13:57PM +0100, David Hildenbrand (arm) wrote: > On 2/5/26 13:10, Lorenzo Stoakes wrote: > > On Thu, Feb 05, 2026 at 11:58:00AM +0000, Alice Ryhl wrote: > > > On Thu, Feb 05, 2026 at 12:43:03PM +0100, David Hildenbrand (arm) wrote: > > > > > > > > I don't expect anybody to set zap_details, but yeah, it could be abused. > > > > It could be abused right now from anywhere else in the kernel > > > > where we don't build as a module :) > > > > > > > > Apparently we export a similar function in rust where we just removed the last parameter. > > > > > > To clarify, said Rust function gets inlined into Rust Binder, so Rust > > > Binder calls the zap_page_range_single() symbol directly. > > > > Presumably only for things compiled into the kernel right? > > Could Rust just use zap_vma_ptes() or does it want to zap things in VMAs > that are not VM_PFNMAP? The VMA is VM_MIXEDMAP, not VM_PFNMAP. Alice