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Originally the secondary trusted keyring provided a keyring to which extra keys may be added, provided those keys were not blacklisted and were vouched for by a key built into the kernel or already in the secondary trusted keyring. On systems with the machine keyring configured, additional keys may also be vouched for by a key on the machine keyring. Prevent loading additional certificates directly onto the secondary keyring, vouched for by keys on the machine keyring, yet allow these certificates to be loaded onto other trusted keyrings. Reviewed-by: Jarkko Sakkinen <jarkko@kernel.org> Signed-off-by: Mimi Zohar <zohar@linux.ibm.com>
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.
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.