d6525f0e65
This patch adds the probe_fs_envblk() function to identify the root filesystem and invoke fs_envblk_init() with the probed filesystem type and device. This checks if the feature is available and initializes the handle, fs_envblk, to access the external environment block. It avoids configurations with diskfilter or cryptodisk where filesystem blocks may be remapped or encrypted. The probe is only invoked when grub-editenv is working on the default environment file path. This restriction ensures that probing and possible raw device access are not triggered for arbitrary user supplied paths, but only for the standard grubenv file. In that case the code checks if the filename equals DEFAULT_ENVBLK_PATH and then calls probe_fs_envblk with fs_envblk_spec. The result is stored in the global fs_envblk handle. At this stage the external environment block is only detected and recorded, and the behavior of grub-editenv is unchanged. Signed-off-by: Michael Chang <mchang@suse.com> Reviewed-by: Neal Gompa <ngompa13@gmail.com> Reviewed-by: Avnish Chouhan <avnish@linux.ibm.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'