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The UDF bitmap allocation code assumes that a recorded Unallocated Space Bitmap is compliant with ECMA-167 4/13, which requires that pad bytes between the end of the bitmap and the end of a logical block are all zero. When a recorded bitmap does not comply with this requirement, for example one padded with FF to the block boundary instead of 00, the allocator may "allocate" blocks that are outside the UDF partition extent. This can result in UDF volume descriptors being overwritten by file data or by partition-level descriptors, and in extreme cases, even in scribbling on a subsequent disk partition. Add a check that the block selected by the allocator actually resides within the UDF partition extent. Signed-off-by: Steven J. Magnani <steve@digidescorp.com> Link: https://lore.kernel.org/r/1564341552-129750-1-git-send-email-steve@digidescorp.com Signed-off-by: Jan Kara <jack@suse.cz>
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.