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[grub] update GRUB 2.04 core.img for Ubuntu 20.10 support

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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.
This commit is contained in:
Pete Batard 2020-09-16 13:59:06 +01:00
parent 1bb2b3b126
commit e987272287
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GPG key ID: 38E0CF5E69EDD671
6 changed files with 22 additions and 14 deletions
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res/grub/readme.txt
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@ -1,7 +1,7 @@
This directory contains the Grub4DOS boot records that are used by Rufus
* grldr.mbr was taken from the official 2019.07.15 release from
http://grub4dos.chenall.net/downloads/grub4dos-0.4.6a-2019-07-15/
* grldr.mbr was taken from the official 2020.08.09 release from
http://grub4dos.chenall.net/downloads/grub4dos-0.4.6a-2020-08-09/
* Note that, for convenience reasons, the first 512 bytes from this grldr.mbr are
*not* the ones that Rufus processes when writing the actual MBR (first 512 bytes).