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When reading the FPSIMD state of current (which occurs when dumping core), it is possible that userspace has modified the FPSIMD registers since the time the task was last scheduled out. Such changes are not guaranteed to be reflected immedately in thread_struct. As a result, a coredump can contain stale values for these registers. Reading the registers of a stopped task via ptrace is unaffected. This patch explicitly flushes the CPU state back to thread_struct before dumping when operating on current, thus ensuring that coredump contents are up to date. Signed-off-by: Dave Martin <Dave.Martin@arm.com> Signed-off-by: Will Deacon <will.deacon@arm.com>
Linux kernel ============ This file was moved to Documentation/admin-guide/README.rst Please notice that there are several guides for kernel developers and users. These guides can be rendered in a number of formats, like HTML and PDF. In order to build the documentation, use ``make htmldocs`` or ``make pdfdocs``. There are various text files in the Documentation/ subdirectory, several of them using the Restructured Text markup notation. See Documentation/00-INDEX for a list of what is contained in each file. 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.