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33f082614c
This patch defines an extra_context signal frame record that can be used to describe an expanded signal frame, and modifies the context block allocator and signal frame setup and parsing code to create, populate, parse and decode this block as necessary. To avoid abuse by userspace, parse_user_sigframe() attempts to ensure that: * no more than one extra_context is accepted; * the extra context data is a sensible size, and properly placed and aligned. The extra_context data is required to start at the first 16-byte aligned address immediately after the dummy terminator record following extra_context in rt_sigframe.__reserved[] (as ensured during signal delivery). This serves as a sanity-check that the signal frame has not been moved or copied without taking the extra data into account. Signed-off-by: Dave Martin <Dave.Martin@arm.com> Reviewed-by: Catalin Marinas <catalin.marinas@arm.com> [will: add __force annotation when casting extra_datap to __user pointer] Signed-off-by: Will Deacon <will.deacon@arm.com> |
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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.