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Mounting overlayfs with a directory on real rootfs (initramfs) as upperdir has failed with following message since commitdb04662e2f("fs: allow detached mounts in clone_private_mount()"). [ 4.080134] overlayfs: failed to clone upperpath Overlayfs mount uses clone_private_mount() to create internal mount for the underlying layers. The commit made clone_private_mount() reject real rootfs because it does not have a parent mount and is in the initial mount namespace, that is not an anonymous mount namespace. This issue can be fixed by modifying the permission check of clone_private_mount() following [1]. Reviewed-by: Christian Brauner <brauner@kernel.org> Fixes:db04662e2f("fs: allow detached mounts in clone_private_mount()") Link: https://lore.kernel.org/all/20250514190252.GQ2023217@ZenIV/ [1] Link: https://lore.kernel.org/all/20250506194849.GT2023217@ZenIV/ Suggested-by: Al Viro <viro@zeniv.linux.org.uk> Signed-off-by: Kazuma Kondo <kazuma-kondo@nec.com> Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
Linux kernel
============
There are several guides for kernel developers and users. These guides can
be rendered in a number of formats, like HTML and PDF. Please read
Documentation/admin-guide/README.rst first.
In order to build the documentation, use ``make htmldocs`` or
``make pdfdocs``. The formatted documentation can also be read online at:
https://www.kernel.org/doc/html/latest/
There are various text files in the Documentation/ subdirectory,
several of them using the reStructuredText markup notation.
Please read the Documentation/process/changes.rst file, as it contains the
requirements for building and running the kernel, and information about
the problems which may result by upgrading your kernel.