secureboot

[Tnctr-altay-24]

Hello @Mexit; UEFI Secure Boot is enabled, and I want to chainload from another loader, but it drops to the GRUB console (grub>normal). It is throwing the following errors:
error: ../../grub/grub-core/commands/search.c:grub_search.fs_file:371:no such device: /MultiOS-USB/config/grub.config.
grub>ls (hd0,msdos1)/
error: ../../grub/grub-core/kern/fs.c:grub_fs_probe:122:unknown filesystem.
Note: (hd0,msdos1) is NTFS. There is no problem when Secure Boot is disabled.

[Mexit]

There is no problem when Secure Boot is disabled.

NTFS is not available in SB:

GRUB_MOD_INIT (ntfs)
{
  if (!grub_is_lockdown ())
    {
      grub_ntfs_fs.mod = mod;
      grub_fs_register (&grub_ntfs_fs);
    }
  my_mod = mod;
}

GRUB_MOD_FINI (ntfs)
{
  if (!grub_is_lockdown ())
    grub_fs_unregister (&grub_ntfs_fs);
}

https://gitlab.freedesktop.org/gnu-grub/grub/-/blob/master/grub-core/fs/ntfs.c?ref_type=heads#L1657-1671

[Tnctr-altay-24]

Thank you. I am chain-loading @a1ive's Grubfm, @ventoy, and G4E using the same method; Secure Boot is enabled, and booting works flawlessly.

Grubfm
https://github.com/a1ive/grub/blob/master/grub-core/fs/ntfs.c#L1236C1-L1245C2
venetoy
https://github.com/ventoy/Ventoy/blob/master/GRUB2/MOD_SRC/grub-2.04/grub-core/fs/ntfs.c#L1235C1-L1244C2