From: Gao Xiang <xiang@kernel.org>
To: Christian Brauner <brauner@kernel.org>
Cc: linux-fsdevel@vger.kernel.org, Jann Horn <jannh@google.com>,
Chris Mason <mason@kernel.org>,
Josef Bacik <josef@toxicpanda.com>,
Christoph Hellwig <hch@lst.de>,
linux-block@vger.kernel.org, linux-kernel@vger.kernel.org,
linux-nvme@lists.infradead.org,
Alexander Viro <viro@zeniv.linux.org.uk>, Jan Kara <jack@suse.cz>,
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 <amir73il@gmail.com>,
linux-erofs@lists.ozlabs.org, linux-kselftest@vger.kernel.org
Subject: Re: [PATCH RFC 40/41] erofs: refuse files on pseudo filesystems as backing files
Date: Tue, 10 Nov 2026 21:45:52 +0100 [thread overview]
Message-ID: <avOCgJPOwRdsIxgd@MacBookPro.fritz.box> (raw)
In-Reply-To: <20261110-work-loop-pseudo-v1-40-4c998976c6c7@kernel.org>
On Tue, Nov 10, 2026 at 10:14:56AM +0100, Christian Brauner wrote:
> File-backed mounts take any regular file as the image and the same goes
> for the extra devices of such a mount. erofs reads them with the
> credentials of the mounter so this doesn't hand out anything the mounter
> couldn't read anyway. But files on pseudo filesystems aren't images.
> Refuse them just like loop does.
>
> Signed-off-by: Christian Brauner (Amutable) <brauner@kernel.org>
Reviewed-by: Gao Xiang <xiang@kernel.org>
Thanks,
Gao Xiang
next prev parent reply other threads:[~2026-11-10 20:46 UTC|newest]
Thread overview: 60+ messages / expand[flat|nested] mbox.gz Atom feed top
2026-11-10 9:14 [PATCH RFC 00/41] fs: don't use pseudo filesystem files as storage Christian Brauner
2026-11-10 9:14 ` [PATCH RFC 01/41] loop: refuse backing files that aren't open for reading Christian Brauner
2026-11-10 12:53 ` Jan Kara
2026-11-10 9:14 ` [PATCH RFC 02/41] nvmet: check that the file backend supports ->{read,write}_iter Christian Brauner
2026-11-10 12:53 ` Jan Kara
2026-11-10 9:14 ` [PATCH RFC 03/41] target: fileio: check that the backing file " Christian Brauner
2026-11-10 12:54 ` Jan Kara
2026-11-10 9:14 ` [PATCH RFC 04/41] fs: add SB_I_PSEUDO Christian Brauner
2026-11-10 12:55 ` Jan Kara
2026-11-10 9:14 ` [PATCH RFC 05/41] kernfs: use fc_init_pseudo() Christian Brauner
2026-11-10 12:56 ` Jan Kara
2026-11-10 9:14 ` [PATCH RFC 06/41] proc: " Christian Brauner
2026-11-10 12:56 ` Jan Kara
2026-11-10 9:14 ` [PATCH RFC 07/41] binfmt_misc: " Christian Brauner
2026-11-10 12:56 ` Jan Kara
2026-11-10 9:14 ` [PATCH RFC 08/41] mqueue: " Christian Brauner
2026-11-10 9:14 ` [PATCH RFC 09/41] bpf: use fc_init_pseudo() for bpffs Christian Brauner
2026-11-10 9:14 ` [PATCH RFC 10/41] nullfs: use fc_init_pseudo() Christian Brauner
2026-11-10 12:57 ` Jan Kara
2026-11-10 9:14 ` [PATCH RFC 11/41] failfs: " Christian Brauner
2026-11-10 12:57 ` Jan Kara
2026-11-10 9:14 ` [PATCH RFC 12/41] rust_binderfs: " Christian Brauner
2026-11-10 9:14 ` [PATCH RFC 13/41] devpts: " Christian Brauner
2026-11-10 9:14 ` [PATCH RFC 14/41] debugfs: " Christian Brauner
2026-11-10 12:59 ` Jan Kara
2026-11-10 9:14 ` [PATCH RFC 15/41] tracefs: " Christian Brauner
2026-11-10 9:14 ` [PATCH RFC 16/41] configfs: " Christian Brauner
2026-11-10 12:59 ` Jan Kara
2026-11-10 9:14 ` [PATCH RFC 17/41] securityfs: " Christian Brauner
2026-11-10 9:14 ` [PATCH RFC 18/41] selinux: use fc_init_pseudo() for selinuxfs Christian Brauner
2026-11-10 9:14 ` [PATCH RFC 19/41] smack: use fc_init_pseudo() for smackfs Christian Brauner
2026-11-10 9:14 ` [PATCH RFC 20/41] apparmor: use fc_init_pseudo() for apparmorfs Christian Brauner
2026-11-10 9:14 ` [PATCH RFC 21/41] nfsd: use fc_init_pseudo() Christian Brauner
2026-11-10 14:55 ` Chuck Lever
2026-11-10 9:14 ` [PATCH RFC 22/41] sunrpc: use fc_init_pseudo() for rpc_pipefs Christian Brauner
2026-11-10 9:14 ` [PATCH RFC 23/41] fuse: use fc_init_pseudo() for fusectl Christian Brauner
2026-11-10 9:14 ` [PATCH RFC 24/41] efivarfs: use fc_init_pseudo() Christian Brauner
2026-11-10 9:14 ` [PATCH RFC 25/41] pstore: " Christian Brauner
2026-11-10 9:14 ` [PATCH RFC 26/41] xenfs: " Christian Brauner
2026-11-10 9:14 ` [PATCH RFC 27/41] openpromfs: " Christian Brauner
2026-11-10 9:14 ` [PATCH RFC 28/41] ocfs2: use fc_init_pseudo() for dlmfs Christian Brauner
2026-11-10 13:01 ` Jan Kara
2026-11-10 9:14 ` [PATCH RFC 29/41] s390/hypfs: use fc_init_pseudo() Christian Brauner
2026-11-10 9:14 ` [PATCH RFC 30/41] powerpc/spufs: " Christian Brauner
2026-11-10 9:14 ` [PATCH RFC 31/41] usb: gadget: f_fs: " Christian Brauner
2026-11-10 9:14 ` [PATCH RFC 32/41] usb: gadget: gadgetfs: " Christian Brauner
2026-11-10 9:14 ` [PATCH RFC 33/41] fs: add file_is_pseudo() Christian Brauner
2026-11-10 13:02 ` Jan Kara
2026-11-10 9:14 ` [PATCH RFC 34/41] loop: refuse files on pseudo filesystems as backing files Christian Brauner
2026-11-10 13:03 ` Jan Kara
2026-11-10 9:14 ` [PATCH RFC 35/41] zloop: refuse zone files on pseudo filesystems Christian Brauner
2026-11-10 9:14 ` [PATCH RFC 36/41] nvmet: refuse files on pseudo filesystems as namespace backing files Christian Brauner
2026-11-10 15:07 ` Bui Nguyen Nhu Quynh
2026-11-10 9:14 ` [PATCH RFC 37/41] target: fileio: refuse files on pseudo filesystems as " Christian Brauner
2026-11-10 9:14 ` [PATCH RFC 38/41] fuse: refuse files on pseudo filesystems as passthrough " Christian Brauner
2026-11-10 10:14 ` Amir Goldstein
2026-11-10 9:14 ` [PATCH RFC 39/41] usb: gadget: f_mass_storage: refuse files on pseudo filesystems Christian Brauner
2026-11-10 9:14 ` [PATCH RFC 40/41] erofs: refuse files on pseudo filesystems as backing files Christian Brauner
2026-11-10 20:45 ` Gao Xiang [this message]
2026-11-10 9:14 ` [PATCH RFC 41/41] selftests/filesystems: add backing file tests for pseudo files Christian Brauner
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