File grub2-linuxefi-fix-boot-params.patch of Package grub2.19555
Index: grub-2.02~rc1/grub-core/loader/i386/efi/linux.c
===================================================================
--- grub-2.02~rc1.orig/grub-core/loader/i386/efi/linux.c
+++ grub-2.02~rc1/grub-core/loader/i386/efi/linux.c
@@ -324,7 +324,14 @@ grub_cmd_linux (grub_command_t cmd __att
lh.code32_start = (grub_uint32_t)(grub_addr_t) kernel_mem;
}
- grub_memcpy(params, &lh, 2 * 512);
+ /* Grub linuxefi erroneously initialize linux's boot_params with non-zero values. (bsc#1025563)
+
+ From https://www.kernel.org/doc/Documentation/x86/boot.txt:
+ The memory for struct boot_params could be allocated anywhere (even above 4G)
+ and initialized to all zero.
+ Then, the setup header at offset 0x01f1 of kernel image on should be
+ loaded into struct boot_params and examined. */
+ grub_memcpy (¶ms->setup_sects, &lh.setup_sects, sizeof (lh) - 0x01f1);
params->type_of_loader = 0x21;