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ef270ec446
Before this commit, it was possible to create end of address space
mappings, but unmapping them via VFIO_IOMMU_UNMAP_DMA, replaying them
for newly added iommu domains, and querying their dirty pages via
VFIO_DMA_UNMAP_FLAG_GET_DIRTY_BITMAP was broken due to bugs caused by
comparisons against (iova + size) expressions, which overflow to zero.
Additionally, there appears to be a page pinning leak in the
vfio_iommu_type1_release() path, since vfio_unmap_unpin()'s loop body
where unmap_unpin_*() are called will never be entered due to overflow
of (iova + size) to zero.
This commit handles DMA map/unmap operations up to the addressable
limit by comparing against inclusive end-of-range limits, and changing
iteration to perform relative traversals across range sizes, rather than
absolute traversals across addresses.
vfio_link_dma() inserts a zero-sized vfio_dma into the rb-tree, and is
only used for that purpose, so discard the size from consideration for
the insertion point.
Tested-by: Alejandro Jimenez <alejandro.j.jimenez@oracle.com>
Fixes:
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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.