6164331d15
xfpregs_set() was incomprehensible. Almost all of the complexity was due to trying to support nonsensically sized writes or -EFAULT errors that would have partially or completely overwritten the destination before failing. Nonsensically sized input would only have been possible using PTRACE_SETREGSET on REGSET_XFP. Fortunately, it appears (based on Debian code search results) that no one uses that API at all, let alone with the wrong sized buffer. Failed user access can be handled more cleanly by first copying to kernel memory. Just rewrite it to require sensible input. Signed-off-by: Andy Lutomirski <luto@kernel.org> Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Signed-off-by: Borislav Petkov <bp@suse.de> Reviewed-by: Borislav Petkov <bp@suse.de> Link: https://lkml.kernel.org/r/20210623121452.504234607@linutronix.de
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.