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Certain applications treat any shared memory buffer that they obtain as an ashmem buffer, meaning that they will attempt to invoke ashmem ioctl commands on that buffer. Android is transitioning to replacing ashmem with memfd, and memfd currently does not support ashmem ioctl commands. So, when an application attempts to invoke an ashmem ioctl command on a memfd, the invocation will fail and report an error back to the app. In order to preserve compatibility between these apps and memfds, add a shim layer which will handle ashmem ioctl commands for memfds. This also folds in the following commits from the android14-6.1 branch: 1. ANDROID: mm/memfd-ashmem-shim: Fix variable length array usage 2. ANDROID: mm/memfd-ashmem-shim: Simplify buffer name retrieval Signed-off-by: Isaac J. Manjarres <isaacmanjarres@google.com> Change-Id: If1a6b6b23b391d5a944384f26a3269d90db392f8
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 Restructured Text markup notation.
See Documentation/00-INDEX for a list of what is contained in each file.
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.