db1d70f2f3
The EFI chainloader checks that a device path can be created for the $root device before allowing chainloading to a given file. This is probably to ensure that the given file can be accessed and loaded by the firmware. However, since GRUB is loading the image itself, the firmware need not be able to access the file location of the image. So remove this check. Also, this fixes an issue where chainloading an image file on a location that is accessible by the firmware, e.g. (hd0,1)/efi/boot.efi, would fail when root is a location inaccessible by the firmware, e.g. memdisk. Use GRUB_EFI_BYTES_TO_PAGES() instead of doing the calculation explicitly. Add comment noting the section where the load options for the chainloaded EFI application is constructed. Signed-off-by: Glenn Washburn <development@efficientek.com> Reviewed-by: Ard Biesheuvel <ardb@kernel.org> 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'