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* GRUB have cherry-picked patches from the "BootHole" vulnerability fix at https://lists.gnu.org/archive/html/grub-devel/2020-07/msg00034.html and have applied them to their 2.04 GRUB loader. * This results in breakage with "error: symbol 'grub_calloc' not found" when using the release GRUB 2.04 version of core.img. * Therefore, we too cherry-picked some patches to apply on top of GRUB 2.04 release to make our core.img compatible with Ubuntu 20.10. * Closes #1616 * Also increase the maximum write stride for ms-sys to 64 KB (required to write the GRUB 2.05 bootloader which is larger than 32 KB) and update hash DB.
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1.3 KiB
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1.3 KiB
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This directory contains the Grub 2.0 boot records that are used by Rufus
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* boot.img and core.img were created from:
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https://ftp.gnu.org/gnu/grub/grub-2.04.tar.xz
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with the following two extra patches applied:
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- https://lists.gnu.org/archive/html/grub-devel/2020-07/msg00016.html
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- https://lists.gnu.org/archive/html/grub-devel/2020-07/msg00017.html
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on a Debian 10.x x64 system using the commands:
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./autogen.sh
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./configure --disable-nls --enable-boot-time
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make -j6
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cd grub-core
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../grub-mkimage -v -O i386-pc -d. -p\(hd0,msdos1\)/boot/grub biosdisk part_msdos fat ntfs exfat -o core.img
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* boot.img has been modified to nop the jump @ 0x66 as per grub2's setup.c comments:
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/* If DEST_DRIVE is a hard disk, enable the workaround, which is
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for buggy BIOSes which don't pass boot drive correctly. Instead,
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they pass 0x00 or 0x01 even when booted from 0x80. */
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* Note that, for convenience reasons, the content of boot.img is *not* the one that
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Rufus processes when writing the MBR.
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Instead, the byte array from src/ms-sys/inc/mbr_grub2.h (whose content is identical)
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is what Rufus uses. If you modify these files, be mindful that you may also need
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to update the array in mbr_grub2.h.
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* For details, see src/format.c, src/msys/br.c and src/msys/inc/mbr_grub2.h. |