66175696f3
The JFS fuzzing revealed an OOB read in grub_jfs_getent(). The crash was caused by an invalid leaf nodes count, diro->dirpage->header.count, which was larger than the maximum number of leaf nodes allowed in an inode. This fix is to ensure that the leaf nodes count is validated in grub_jfs_opendir() before calling grub_jfs_getent(). On the occasion replace existing raw numbers with newly defined constant. Signed-off-by: Lidong Chen <lidong.chen@oracle.com> Reviewed-by: Daniel Kiper <daniel.kiper@oracle.com> Reviewed-by: Alec Brown <alec.r.brown@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'