2f4430cc0a
The corpus was generating issues in grub_btrfs_read_logical() when attempting to iterate over stripe entries in the superblock's bootmapping. In most cases the reason for the failure was that the number of stripes in chunk->nstripes exceeded the possible space statically allocated in superblock bootmapping space. Each stripe entry in the bootmapping block consists of a grub_btrfs_key followed by a grub_btrfs_chunk_stripe. Another issue that came up was that while calculating the chunk size, in an earlier piece of code in that function, depending on the data provided in the btrfs file system, it would end up calculating a size that was too small to contain even 1 grub_btrfs_chunk_item, which is obviously invalid too. 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'