6d7bb89efa
The PE/COFF spec permits the COFF signature and file header to appear anywhere in the file, and the actual offset is recorded in 4 byte little endian field at offset 0x3c of the image. When GRUB is emitted as a PE/COFF binary, we reuse the 128 byte MS-DOS stub (even for non-x86 architectures), putting the COFF signature and file header at offset 0x80. However, other PE/COFF images may use different values, and non-x86 Linux kernels use an offset of 0x40 instead. So let's get rid of the grub_pe32_header struct from pe32.h, given that it does not represent anything defined by the PE/COFF spec. Instead, introduce a minimal struct grub_msdos_image_header type based on the PE/COFF spec's description of the image header, and use the offset recorded at file position 0x3c to discover the actual location of the PE signature and the COFF image header. The remaining fields are moved into a struct grub_pe_image_header, which we will use later to access COFF header fields of arbitrary images (and which may therefore appear at different offsets) Signed-off-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'