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ab03e91e60
The ESRT code currently contains two consistency checks on the memory descriptor it obtains, but one of them is both incomplete and can only trigger on invalid descriptors. So let's drop these checks, and instead disregard descriptors entirely if the start address is misaligned, or if the number of pages reaches to or beyond the end of the address space. Note that the memory map as a whole could still be inconsistent: multiple entries might cover the same area, or the address could be outside of the addressable PA space, but validating that goes beyond the scope of these helpers. Also note that since the physical address space is never 64-bits wide, a descriptor that includes the last page of memory is not valid. This is fortunate, since it means that a valid physical address will never be an error pointer and that the length of a memory descriptor in bytes will fit in a 64-bit unsigned integer. Co-developed-by: Ard Biesheuvel <ardb@kernel.org> Signed-off-by: Ard Biesheuvel <ardb@kernel.org> Signed-off-by: Demi Marie Obenour <demi@invisiblethingslab.com> Tested-by: Marek Marczykowski-Górecki <marmarek@invisiblethingslab.com> Signed-off-by: Ard Biesheuvel <ardb@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.