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When punching a hole or truncating an inode down to a given size, also check if the truncate point / start of the hole is within the range we have metadata for. Otherwise, we can end up freeing blocks that shouldn't be freed, corrupting the inode, or crashing the machine when trying to punch a hole into the void. When growing an inode via truncate, we set the new size but we don't allocate additional levels of indirect blocks and grow the inode height. When shrinking that inode again, the new size may still point beyond the end of the inode's metadata. Fixes xfstest generic/476. Debugged-by: Bob Peterson <rpeterso@redhat.com> Signed-off-by: Andreas Gruenbacher <agruenba@redhat.com> Signed-off-by: Bob Peterson <rpeterso@redhat.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.