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12e4a381c5
At the end of a getfsmap call, we will set FMR_OF_LAST in the last struct fsmap that was handed in by userspace if we've truly run out of space mapping record (as opposed to simply running out of space in the user array). Unfortunately, fmh_entries is the wrong check for whether or not we've filled out anything in the user array because the ioctl provides that fmh_count==0 sets fmh_entries without filling out the user array. Therefore we end up writing things into user memory areas that we weren't given, and kaboom. Since Christoph amended the getfsmap structure to track the number of fsmap entries we've actually filled out, use that as part of deciding if we have to set the OF_LAST flag. Signed-off-by: Darrick J. Wong <darrick.wong@oracle.com> Reviewed-by: Christoph Hellwig <hch@lst.de> |
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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.