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[ Upstream commit 35aae182bd7b422be3cefc08c12207bf2b973364 ] The ability to get and set system parameters will be exposed to user space, so let's get a little more strict about malformed papr_sysparm_buf objects. * Create accessors for the length field of struct papr_sysparm_buf. The length is always stored in MSB order and this is better than spreading the necessary conversions all over. * Reject attempts to submit invalid buffers to RTAS. * Warn if RTAS returns a buffer with an invalid length, clamping the returned length to a safe value that won't overrun the buffer. These are meant as precautionary measures to mitigate both firmware and kernel bugs in this area, should they arise, but I am not aware of any. Signed-off-by: Nathan Lynch <nathanl@linux.ibm.com> Signed-off-by: Michael Ellerman <mpe@ellerman.id.au> Link: https://msgid.link/20231212-papr-sys_rtas-vs-lockdown-v6-10-e9eafd0c8c6c@linux.ibm.com Signed-off-by: Sasha Levin <sashal@kernel.org>
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.