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Tue, 03 Feb 2026 02:29:12 -0800 (PST) From: Askar Safin To: dhowells@redhat.com Cc: axboe@kernel.dk, brauner@kernel.org, cem@kernel.org, djwong@kernel.org, hch@lst.de, kundan.kumar@samsung.com, linux-block@vger.kernel.org, linux-fsdevel@vger.kernel.org, linux-xfs@vger.kernel.org, viro@zeniv.linux.org.uk, willy@infradead.org, wqu@suse.com Subject: Re: [PATCH 03/14] iov_iter: extract a iov_iter_extract_bvecs helper from bio code Date: Tue, 3 Feb 2026 13:28:21 +0300 Message-ID: <20260203102821.3017412-1-safinaskar@gmail.com> X-Mailer: git-send-email 2.47.3 In-Reply-To: <1763225.1769180226@warthog.procyon.org.uk> References: <1763225.1769180226@warthog.procyon.org.uk> Precedence: bulk X-Mailing-List: linux-fsdevel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit David Howells : > Can we make vmsplice() just copy data? vmsplice already caused at least one security issue in the past: CVE-2020-29374 (see https://lwn.net/Articles/849638/ ). There may be other CVEs, try to search CVE database. Also, I think vmsplice is rarely used. So, if you author a patch, which makes vmsplice equivalent to readv/writev, and mention these CVEs, then, I think, such patch has high chance to succeed. Also, as well as I understand, this patch introduces kbufs, which are modern uring-based alternative to whatever splice/pipe originally meant to be: https://lore.kernel.org/all/20260116233044.1532965-4-joannelkoong@gmail.com/ . I. e. these kbufs provide kernel-managed buffer for fast I/O. So, I think it is good idea to deprecate splice in favor of these kbufs. -- Askar Safin