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Tue, 10 Nov 2026 09:19:57 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=kernel.org; s=k20260515; t=1794302403; bh=E+IOyvszTPpv67WVfApXcw8urPUkzwLhKXwxrxd5Q2U=; h=From:Date:Subject:References:In-Reply-To:To:Cc; b=GRiIgHwNZvImcyL7ZrhwcHTim1Tcg8ha0BAVLvCt63eibDuBdqoGnn3+IZ3T7OBIq kT6r8YMuTD7me3jVVO4LuvwQYkPqosPEVX8f4q9eZuJZsQvKrNsIgO5JMMLqqeNIuC 5Cpr1r58rbzBBX6KMjeREg5OUsa/9eOU65Z5i70WZg176K2uk1tQ1kAhA4U0o0Rctw xZ/y1A7h5XbjDTP8H3oewDpTzB4kJ0kw8bjZG9JUpDxnNRmZc91S3mqwbwSIu6bKQ1 710KWpylBRJOXcVv5bGIBzE03omQg/l6rlLylLNvB6cAWjRRFZkeN1M+920TaGjY0B 2UXvy+J5ImDmQ== From: Christian Brauner Date: Tue, 10 Nov 2026 10:14:52 +0100 Subject: [PATCH RFC 36/41] nvmet: refuse files on pseudo filesystems as namespace backing files X-Mailing-List: linuxppc-dev@lists.ozlabs.org List-Id: List-Help: List-Owner: List-Post: List-Archive: , List-Subscribe: , , Precedence: list X-Archived-By: MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: 7bit Message-Id: <20261110-work-loop-pseudo-v1-36-4c998976c6c7@kernel.org> References: <20261110-work-loop-pseudo-v1-0-4c998976c6c7@kernel.org> In-Reply-To: <20261110-work-loop-pseudo-v1-0-4c998976c6c7@kernel.org> To: linux-fsdevel@vger.kernel.org Cc: 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, "Christian Brauner (Amutable)" X-Mailer: b4 0.17-dev-ce4c1 X-Developer-Signature: v=1; a=openpgp-sha256; l=834; i=brauner@kernel.org; h=from:subject:message-id; bh=agqenJdWQq7gypo76jkCFbW4mXy4h6l0lNCXX+ASm3g=; b=owGbwMvMwCU28Zj0gdSKO4sYT6slMWR9erDvm3yLxwpNhn3Vf/xC/LZIi53fJ7yLL7tHITliz 91kU4+kjlIWBjEuBlkxRRaHdpNwueU8FZuNMjVg5rAygQxh4OIUgIm8FmJk6Auyf5jNeWOi0OnH C2RnbHW9nXtha/oTsYTE2efzD909cIzhf93azF97BBdfrrbP5nki8XXrjrDbU/+oPHgTKJzVsWp jPzcA X-Developer-Key: i=brauner@kernel.org; a=openpgp; fpr=4880B8C9BD0E5106FC070F4F7B3C391EFEA93624 X-Spam-Status: No, score=-18.8 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_CR_TRAILER,INCLUDES_PATCH,MAILING_LIST_MULTI,SPF_HELO_PASS, SPF_PASS,USER_AGENT_GIT autolearn=unavailable autolearn_force=no version=4.0.1 X-Spam-Checker-Version: SpamAssassin 4.0.1 (2024-03-26) on aws-us-west-2-korg-listserv-alma10-1 The file backend takes any path that isn't a block device. With buffered_io=1 that includes files on procfs or sysfs which then get read and written by a kernel worker on behalf of the host. Refuse files on pseudo filesystems just like loop does. Signed-off-by: Christian Brauner (Amutable) --- drivers/nvme/target/io-cmd-file.c | 5 +++++ 1 file changed, 5 insertions(+) diff --git a/drivers/nvme/target/io-cmd-file.c b/drivers/nvme/target/io-cmd-file.c index dfa8aa46188c..71c69bac5394 100644 --- a/drivers/nvme/target/io-cmd-file.c +++ b/drivers/nvme/target/io-cmd-file.c @@ -52,6 +52,11 @@ int nvmet_file_ns_enable(struct nvmet_ns *ns) goto err; } + if (file_is_pseudo(ns->file)) { + ret = -EINVAL; + goto err; + } + nvmet_file_ns_revalidate(ns); /* -- 2.53.0