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The fuzzer is generating btrfs file systems that have chunks with invalid combinations of stripes and substripes for the given RAID configurations. After examining the Linux kernel fs/btrfs/tree-checker.c code, it appears that sub-stripes should only be applied to RAID10, and in that case there should only ever be 2 of them. Similarly, RAID single should only have 1 stripe, and RAID1/1C3/1C4 should have 2. 3 or 4 stripes respectively, which is what redundancy corresponds. Some of the chunks ended up with a size of 0, which grub_malloc() still returned memory for and in turn generated ASAN errors later when accessed. While it would be possible to specifically limit the number of stripes, a more correct test was on the combination of the chunk item, and the number of stripes by the size of the chunk stripe structure in comparison to the size of the chunk itself. Signed-off-by: Darren Kenny <darren.kenny@oracle.com> Reviewed-by: Daniel Kiper <daniel.kiper@oracle.com>
This is GRUB 2, the second version of the GRand Unified Bootloader. GRUB 2 is rewritten from scratch to make GNU GRUB cleaner, safer, more robust, more powerful, and more portable. See the file NEWS for a description of recent changes to GRUB 2. See the file INSTALL for instructions on how to build and install the GRUB 2 data and program files. See the file MAINTAINERS for information about the GRUB maintainers, etc. If you found a security vulnerability in the GRUB please check the SECURITY file to get more information how to properly report this kind of bugs to the maintainers. Please visit the official web page of GRUB 2, for more information. The URL is <http://www.gnu.org/software/grub/grub.html>. More extensive documentation is available in the Info manual, accessible using 'info grub' after building and installing GRUB 2. There are a number of important user-visible differences from the first version of GRUB, now known as GRUB Legacy. For a summary, please see: info grub Introduction 'Changes from GRUB Legacy'