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539979b6ec
The ID mapping table structure of the IORT table describes the size of a range using a num_ids field carrying the number of IDs in the region minus one. This has been misinterpreted in the past in the parsing code, and firmware is known to have shipped where this results in an ambiguity, where regions that should be adjacent have an overlap of one value. So let's work around this by detecting this case specifically: when resolving an ID translation, allow one that matches right at the end of a multi-ID region to be superseded by a subsequent one. To prevent potential regressions on broken firmware that happened to work before, only take the subsequent match into account if it occurs at the start of a mapping region. Signed-off-by: Ard Biesheuvel <ardb@kernel.org> Reviewed-by: Lorenzo Pieralisi <lorenzo.pieralisi@arm.com> Link: https://lore.kernel.org/r/20200501161014.5935-3-ardb@kernel.org Signed-off-by: Will Deacon <will@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.