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a8efadda86
The current implementation of the guard region tests assume that /tmp is
mounted as tmpfs, that is shmem.
This isn't always the case, and at least one instance of a spurious test
failure has been reported as a result.
This assumption is unsafe, rushed and silly - and easily remedied by
simply using memfd, so do so.
We also have to fixup the readonly_file test to explicitly only be
applicable to file-backed cases.
Link: https://lkml.kernel.org/r/20250425162436.564002-1-lorenzo.stoakes@oracle.com
Fixes:
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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.