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Code regions within cmpxchg_user_key() functions may be executed with a non-default access key, which may lead to a protection exception if the corresponding page has the fetch-protection bit enabled. There is code in place which initializes the storage keys of such pages when needed. However there is also the possibility of out-of-line execution of such code in case a kprobe is set within such a region. To avoid this problem prevent that any kprobe can be set within the cmpxchg_user_key() functions. Reviewed-by: Claudio Imbrenda <imbrenda@linux.ibm.com> Signed-off-by: Heiko Carstens <hca@linux.ibm.com> Signed-off-by: Alexander Gordeev <agordeev@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 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.