From 5a224d1beaebc0329fcbdeac4abda978e4b5ae8f Mon Sep 17 00:00:00 2001
From: nilusyi <nilusyi@tencent.com>
Date: Fri, 29 Mar 2024 16:57:10 +0800
Subject: [PATCH 012/272] linuxefi fix boot params

+     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

Michael Chang <mchang@suse.com>
---
 grub-core/loader/i386/efi/linux.c | 9 ++++++++-
 1 file changed, 8 insertions(+), 1 deletion(-)

diff --git a/grub-core/loader/i386/efi/linux.c b/grub-core/loader/i386/efi/linux.c
index 16f7554e2..6bb9c484f 100644
--- a/grub-core/loader/i386/efi/linux.c
+++ b/grub-core/loader/i386/efi/linux.c
@@ -298,7 +298,14 @@ grub_cmd_linux (grub_command_t cmd __attribute__ ((unused)),
       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 (&params->setup_sects, &lh.setup_sects, sizeof (lh) - 0x01f1);
 
   params->type_of_loader = 0x21;
 
-- 
2.41.0