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imf27.hostedemail.com; dkim=none; spf=pass (imf27.hostedemail.com: domain of hch@lst.de designates 213.95.11.211 as permitted sender) smtp.mailfrom=hch@lst.de; dmarc=pass (policy=none) header.from=lst.de Received: by verein.lst.de (Postfix, from userid 2407) id 52A7668D16; Wed, 11 Nov 2026 16:12:03 +0100 (CET) Date: Wed, 11 Nov 2026 16:12:02 +0100 From: Christoph Hellwig To: Christian Brauner Cc: linux-fsdevel@vger.kernel.org, Jann Horn , Chris Mason , Josef Bacik , Christoph Hellwig , linux-block@vger.kernel.org, linux-kernel@vger.kernel.org, linux-nvme@lists.infradead.org, Alexander Viro , Jan Kara , linux-scsi@vger.kernel.org, target-devel@vger.kernel.org, driver-core@lists.linux.dev, linux-mm@kvack.org, bpf@vger.kernel.org, linux-security-module@vger.kernel.org, selinux@vger.kernel.org, apparmor@lists.ubuntu.com, linux-nfs@vger.kernel.org, netdev@vger.kernel.org, fuse-devel@lists.linux.dev, linux-efi@vger.kernel.org, xen-devel@lists.xenproject.org, ocfs2-devel@lists.linux.dev, linux-s390@vger.kernel.org, linuxppc-dev@lists.ozlabs.org, linux-usb@vger.kernel.org, Amir Goldstein , linux-erofs@lists.ozlabs.org, linux-kselftest@vger.kernel.org Subject: Re: [PATCH RFC 38/41] fuse: refuse files on pseudo filesystems as passthrough backing files Message-ID: <20261111151202.GA11391@lst.de> References: <20261110-work-loop-pseudo-v1-0-4c998976c6c7@kernel.org> <20261110-work-loop-pseudo-v1-38-4c998976c6c7@kernel.org> X-Archived-By: MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20261110-work-loop-pseudo-v1-38-4c998976c6c7@kernel.org> User-Agent: Mutt/1.5.17 (2007-11-01) X-Spam-Status: No, score=-5.3 required=3.0 tests=BAYES_00, HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,SPF_HELO_PASS, SPF_PASS,USER_AGENT_SANE_1 autolearn=no autolearn_force=no version=4.0.1 X-Rspamd-Server: rspam09 X-Stat-Signature: hg9wifz8dx4scjxn8su8derizgqtmkot X-Rspamd-Queue-Id: 534BD4000E X-Rspam-User: X-HE-Tag: 1794409927-286865 X-HE-Meta: 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 RfRlrrgl FKkkW4ewx/MACkRSmWqAxxauR1sqhf9nubSYVOYSxp5+MnJGXYpxIWlZjK+uOotvBRk/lPvMUtRtmSbWn7jFPAktEmq62sq9w5A5gDUqMV8ObBzO8r6VT5scNtA== 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 I've seen setups where people use fuse to mediate access to sysfs sysfs in odd ways. No idea if that's still around, but if so, this patch will break it.