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Add extra check.

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Still, Ventoy is used in some non standard way. (e.g. WuYouBBS)
I have explained in
8bbd5a14a3

So I add an extra check.
This is also a prepare for the future Ventoy secure boot policy.
This commit is contained in:
longpanda 2021-10-22 11:58:49 +08:00
parent ec4b6c2a2c
commit f3b65452f4
1 changed files with 55 additions and 2 deletions
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55
GRUB2/MOD_SRC/grub-2.04/grub-core/ventoy/ventoy_cmd.c
View file

@ -51,6 +51,37 @@
GRUB_MOD_LICENSE ("GPLv3+");
static grub_uint8_t g_check_mbr_data[440] = {
0xEB, 0x63, 0x90, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x80, 0x01, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0xFF, 0xFA, 0x90, 0x90, 0xF6, 0xC2, 0x80, 0x74, 0x05, 0xF6, 0xC2, 0x70,
0x74, 0x02, 0xB2, 0x80, 0xEA, 0x79, 0x7C, 0x00, 0x00, 0x31, 0xC0, 0x8E, 0xD8, 0x8E, 0xD0, 0xBC,
0x00, 0x20, 0xFB, 0xA0, 0x64, 0x7C, 0x3C, 0xFF, 0x74, 0x02, 0x88, 0xC2, 0x52, 0xBE, 0x90, 0x7D,
0xE8, 0x16, 0x01, 0xBE, 0x05, 0x7C, 0xB4, 0x41, 0xBB, 0xAA, 0x55, 0xCD, 0x13, 0x5A, 0x52, 0x72,
0x3D, 0x81, 0xFB, 0x55, 0xAA, 0x75, 0x37, 0x83, 0xE1, 0x01, 0x74, 0x32, 0x31, 0xC0, 0x89, 0x44,
0x04, 0x40, 0x88, 0x44, 0xFF, 0x89, 0x44, 0x02, 0xC7, 0x04, 0x10, 0x00, 0x66, 0x8B, 0x1E, 0x5C,
0x7C, 0x66, 0x89, 0x5C, 0x08, 0x66, 0x8B, 0x1E, 0x60, 0x7C, 0x66, 0x89, 0x5C, 0x0C, 0xC7, 0x44,
0x06, 0x00, 0x70, 0xB4, 0x42, 0xCD, 0x13, 0x72, 0x05, 0xBB, 0x00, 0x70, 0xEB, 0x76, 0xB4, 0x08,
0xCD, 0x13, 0x73, 0x0D, 0x5A, 0x84, 0xD2, 0x0F, 0x83, 0xD8, 0x00, 0xBE, 0x96, 0x7D, 0xE9, 0x82,
0x00, 0x66, 0x0F, 0xB6, 0xC6, 0x88, 0x64, 0xFF, 0x40, 0x66, 0x89, 0x44, 0x04, 0x0F, 0xB6, 0xD1,
0xC1, 0xE2, 0x02, 0x88, 0xE8, 0x88, 0xF4, 0x40, 0x89, 0x44, 0x08, 0x0F, 0xB6, 0xC2, 0xC0, 0xE8,
0x02, 0x66, 0x89, 0x04, 0x66, 0xA1, 0x60, 0x7C, 0x66, 0x09, 0xC0, 0x75, 0x4E, 0x66, 0xA1, 0x5C,
0x7C, 0x66, 0x31, 0xD2, 0x66, 0xF7, 0x34, 0x88, 0xD1, 0x31, 0xD2, 0x66, 0xF7, 0x74, 0x04, 0x3B,
0x44, 0x08, 0x7D, 0x37, 0xFE, 0xC1, 0x88, 0xC5, 0x30, 0xC0, 0xC1, 0xE8, 0x02, 0x08, 0xC1, 0x88,
0xD0, 0x5A, 0x88, 0xC6, 0xBB, 0x00, 0x70, 0x8E, 0xC3, 0x31, 0xDB, 0xB8, 0x01, 0x02, 0xCD, 0x13,
0x72, 0x1E, 0x8C, 0xC3, 0x60, 0x1E, 0xB9, 0x00, 0x01, 0x8E, 0xDB, 0x31, 0xF6, 0xBF, 0x00, 0x80,
0x8E, 0xC6, 0xFC, 0xF3, 0xA5, 0x1F, 0x61, 0xFF, 0x26, 0x5A, 0x7C, 0xBE, 0x93, 0x7D, 0xEB, 0x03,
0xBE, 0x99, 0x7D, 0xE8, 0x33, 0x00, 0xBE, 0x9C, 0x7D, 0xE8, 0x2D, 0x00, 0xCD, 0x18, 0xEB, 0xFE,
0x58, 0x58, 0x58, 0x58, 0x58, 0x58, 0x58, 0x58, 0x58, 0x58, 0x58, 0x58, 0x58, 0x58, 0x58, 0x58,
0x56, 0x54, 0x00, 0x47, 0x65, 0x00, 0x48, 0x44, 0x00, 0x52, 0x64, 0x00, 0x20, 0x45, 0x72, 0x0D,
0x0A, 0x00, 0xBB, 0x01, 0x00, 0xB4, 0x0E, 0xCD, 0x10, 0xAC, 0x3C, 0x00, 0x75, 0xF4, 0xC3, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00
};
initrd_info *g_initrd_img_list = NULL;
initrd_info *g_initrd_img_tail = NULL;
int g_initrd_img_count = 0;
@ -479,7 +510,7 @@ static int ventoy_set_check_result(int ret)
grub_printf(VTOY_WARNING"\n");
grub_printf(VTOY_WARNING"\n\n\n");
grub_printf("This is NOT a standard Ventoy device and is NOT supported (0x%x).\n\n", ret);
grub_printf("This is NOT a standard Ventoy device and is NOT supported (%d).\n\n", ret);
grub_printf("You should follow the instructions in https://www.ventoy.net to use Ventoy.\n");
grub_printf("\n\nWill exit after 10 seconds ...... ");
@ -497,6 +528,8 @@ static int ventoy_check_official_device(grub_device_t dev)
grub_uint64_t offset;
char devname[64];
grub_fs_t fs;
grub_uint8_t mbr[512];
grub_disk_t disk;
grub_device_t dev2;
char *label = NULL;
struct grub_partition *partition;
@ -612,6 +645,26 @@ static int ventoy_check_official_device(grub_device_t dev)
grub_device_close(dev2);
}
/* MBR check */
disk = grub_disk_open(dev->disk->name);
if (!disk)
{
return ventoy_set_check_result(11);
}
grub_memset(mbr, 0, 512);
grub_disk_read(disk, 0, 0, 512, mbr);
grub_disk_close(disk);
g_check_mbr_data[92] = mbr[92];
g_check_mbr_data[102] = mbr[102];
g_check_mbr_data[103] = mbr[103];
grub_memcpy(g_check_mbr_data + 0x180, mbr + 0x180, 16);
if (grub_memcmp(g_check_mbr_data, mbr, 440))
{
return ventoy_set_check_result(12);
}
return ventoy_set_check_result(0);
}