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b=IR3X1VQ3sfK8nwizv/o40dv7x4UY52RwB32eTAzN6vkUjJen1CO+9kUOt76HB0+xD iykOW4+TrFC5n9TXfXZXtvSDoJ4ycLBnff42d5ofdKUqncVr1sayrtVj0RNfWKbJU2 Tcbhu2r/7h/Y6zlcnS56zEIybxwmlYZXlD2hhVKlYta+WHVbTe0y4D/eZeHvVWKp00 NFuTbY3VnbUD74bfNyrUJtoXbuONXsBl+I1+jvo3g0GUZcmsHQYkUePajF8NZrvxr3 2nW6ksVuhtD3SjQi/lFyT0qTOGpPU82KdOPIe3G2NUq68rkk9r8Elc8gOHPPplMtq/ vXK2p3JnBERXQ== Message-ID: <6dfa5f7c-ffbd-4605-96f2-09e365ce57dd@kernel.org> Date: Sun, 31 May 2026 21:01:10 +0200 MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH 0/3] vmsplice: make vmsplice a trivial wrapper for preadv2/pwritev2 To: Pedro Falcato , Askar Safin Cc: linux-fsdevel@vger.kernel.org, Christian Brauner , Alexander Viro , Jan Kara , linux-kernel@vger.kernel.org, linux-mm@kvack.org, linux-api@vger.kernel.org, netdev@vger.kernel.org, Linus Torvalds , Matthew Wilcox , Jens Axboe , Christoph Hellwig , David Howells , Andrew Morton , Miklos Szeredi , patches@lists.linux.dev References: <20260531010107.1953702-1-safinaskar@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-Server: rspam11 X-Stat-Signature: ot4wpyutejd1o7ptfk6ay1iqnzye5dci X-Rspamd-Queue-Id: 75E1C180006 X-Rspam-User: X-HE-Tag: 1780254076-739024 X-HE-Meta: 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 n4dmiVFX UmV05Dr8rTxLh0EkpUvuEgWsDFkzlB5fdI+qRNTQ4AHMW45sv7ixg23EG6ppQI0/0DlI/TEiKR8UPPek+zHnXI6X8k5PL/4vpiJ+ujLyhI6OTz8qS8lM9H7JJyUH2+gM4HT9Cl90tLFust4q0gnxj430d7R7pULQzo6g9Tgp1dDbhTXy4yH8n+gbFVwBcpnMHdAf6NlCLtnXgHqahGtMYZiaYjLcPQ7xPZkNtjhzRf+TWOevATHIxZO+s6iKvU/SByOU8RorvaGRatUxjI6CGNLgaEkj9KZQzpF8+0bwb221AmRr7LYvNKKbv6NLrMo0efH3qKyrnFbVk18CP5bMccVnnUZRfG2f9K3f/2Lhs3/aeWLsCEcrm7QV8+kenWWNEhOfvPWTiQcb23Gw/TmqpzsH0rfzu+oQva041XYUlP5CwaT8= Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: On 5/31/26 10:54, Pedro Falcato wrote: > On Sun, May 31, 2026 at 01:01:04AM +0000, Askar Safin wrote: >> This patchset is for VFS. >> >> Recently we got a lot of vulnerabilities in splice/vmsplice. >> >> Also vmsplice already was source of vulnerabilities in the past: >> CVE-2020-29374 (see https://lwn.net/Articles/849638/ ). >> >> Also vmsplice is problematic for other reasons. Here is what other >> developers say: >> >> Linus Torvalds in 2023: >>> So I'd personally be perfectly ok with just making vmsplice() be >>> exactly the same as write, and turn all of vmsplice() into just "it's >>> a read() if the pipe is open for read, and a write if it's open for >>> writing". >> https://lore.kernel.org/all/CAHk-=wgG_2cmHgZwKjydi7=iimyHyN8aessnbM9XQ9ufbaUz9g@mail.gmail.com/ >> >> Christoph Hellwig in May 2026: >>> vmsplice is the worst, as it is one of the few remaining places that >>> can incorrectly dirty file backed pages without telling the file system >>> and cause the other problems fixed by a FOLL_PIN conversion, but it is >>> the only one where we do not have any idea yet how we could convert it >>> to FOLL_PIN due to the unbounded pin time. >> https://lore.kernel.org/all/agwFlBKvKytjURDO@infradead.org/ >> >> See recent discussion here: >> https://lore.kernel.org/all/20260516182126.530498-1-pfalcato@suse.de/T/#u > > So, you took an ongoing discussion with an ongoing RFC patchset, and you > decided to reimplement part of the idea on your own, as a concurrent patchset. > > Riiiiiight.... I don't think I have to NAK this, do I? Jup. I'll just ignore this patch set here. -- Cheers, David