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Previously, the number of extent entries was not properly capped based on the actual available space. This could lead to insufficient reads for external extents since the computation was based solely on the inline extent layout. In this patch, when processing the extent header we determine whether the header is stored inline, i.e. at inode->blocks.dir_blocks, or in an external extent block. We then clamp the number of entries accordingly (using max_inline_ext for inline extents and max_external_ext for external extent blocks). This change ensures that only the valid number of extent entries is processed preventing out-of-bound reads and potential filesystem corruption. Fixes: 7e2f750f0a (fs/ext2: Fix out-of-bounds read for inline extents) Signed-off-by: Michael Chang <mchang@suse.com> Tested-by: Christian Hesse <mail@eworm.de> 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'