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Paul Moore 5fc80fb5b7 selinux: always check the file label in selinux_kernel_read_file() Commit `2039bda1fa` ("LSM: Add "contents" flag to kernel_read_file hook") added a new flag to the security_kernel_read_file() LSM hook, "contents", which was set if a file was being read in its entirety or if it was the first chunk read in a multi-step process. The SELinux LSM callback was updated to only check against the file label if this "contents" flag was set, meaning that in multi-step reads the file label was not considered in the access control decision after the initial chunk. Thankfully the only in-tree user that performs a multi-step read is the "bcm-vk" driver and it is loading firmware, not a kernel module, so there are no security regressions to worry about. However, we still want to ensure that the SELinux code does the right thing, and always checks the file label, especially as there is a chance the file could change between chunk reads. Fixes: `2039bda1fa` ("LSM: Add "contents" flag to kernel_read_file hook") Signed-off-by: Paul Moore <paul@paul-moore.com>		History 2025-02-07 15:30:54 -05:00
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README

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.