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9c27e5cc39Christian Brauner <brauner@kernel.org> says:
Currently overlayfs uses the mounter's credentials for it's
override_creds() calls. That provides a consistent permission model.
This patches allows a caller to instruct overlayfs to use its
credentials instead. The caller must be located in the same user
namespace hierarchy as the user namespace the overlayfs instance will be
mounted in. This provides a consistent and simple security model.
With this it is possible to e.g., mount an overlayfs instance where the
mounter must have CAP_SYS_ADMIN but the credentials used for
override_creds() have dropped CAP_SYS_ADMIN. It also allows the usage of
custom fs{g,u}id different from the callers and other tweaks.
* patches from https://lore.kernel.org/r/20250219-work-overlayfs-v3-0-46af55e4ceda@kernel.org:
selftests/ovl: add third selftest for "override_creds"
selftests/ovl: add second selftest for "override_creds"
selftests/filesystems: add utils.{c,h}
selftests/ovl: add first selftest for "override_creds"
ovl: allow to specify override credentials
Link: https://lore.kernel.org/r/20250219-work-overlayfs-v3-0-46af55e4ceda@kernel.org
Signed-off-by: Christian Brauner <brauner@kernel.org>
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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.