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3ab378cfa7Christian Brauner <brauner@kernel.org> says: For a while now we have supported file handles for pidfds. This has proven to be very useful. Extend the concept to cover namespaces as well. After this patchset it is possible to encode and decode namespace file handles using the commong name_to_handle_at() and open_by_handle_at() apis. Namespaces file descriptors can already be derived from pidfds which means they aren't subject to overmount protection bugs. IOW, it's irrelevant if the caller would not have access to an appropriate /proc/<pid>/ns/ directory as they could always just derive the namespace based on a pidfd already. It has the same advantage as pidfds. It's possible to reliably and for the lifetime of the system refer to a namespace without pinning any resources and to compare them. Permission checking is kept simple. If the caller is located in the namespace the file handle refers to they are able to open it otherwise they must hold privilege over the owning namespace of the relevant namespace. Both the network namespace and the mount namespace already have an associated cookie that isn't recycled and is fully exposed to userspace. Move this into ns_common and use the same id space for all namespaces so they can trivially and reliably be compared. There's more coming based on the iterator infrastructure but the series is large enough and focuses on file handles. Extensive selftests included. * patches from https://lore.kernel.org/20250912-work-namespace-v2-0-1a247645cef5@kernel.org: (33 commits) selftests/namespaces: add file handle selftests selftests/namespaces: add identifier selftests tools: update nsfs.h uapi header nsfs: add missing id retrieval support nsfs: support exhaustive file handles nsfs: support file handles nsfs: add current_in_namespace() ns: add to_<type>_ns() to respective headers uts: support ns lookup user: support ns lookup time: support ns lookup pid: support ns lookup net: support ns lookup ipc: support ns lookup cgroup: support ns lookup mnt: support ns lookup nstree: make iterator generic ns: remove ns_alloc_inum() uts: use ns_common_init() user: use ns_common_init() ... 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.