bcd7fb9fd2
This only supports DomU Linux bzImage, ignoring bare ELF images and Dom0 Xen+Linux but those cases are not applicable to us on CoreOS.
110 lines
3 KiB
C
110 lines
3 KiB
C
/*
|
|
* GRUB -- GRand Unified Bootloader
|
|
* Copyright (C) 2013 Free Software Foundation, Inc.
|
|
*
|
|
* GRUB is free software: you can redistribute it and/or modify
|
|
* it under the terms of the GNU General Public License as published by
|
|
* the Free Software Foundation, either version 3 of the License, or
|
|
* (at your option) any later version.
|
|
*
|
|
* GRUB is distributed in the hope that it will be useful,
|
|
* but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
|
* GNU General Public License for more details.
|
|
*
|
|
* You should have received a copy of the GNU General Public License
|
|
* along with GRUB. If not, see <http://www.gnu.org/licenses/>.
|
|
*/
|
|
|
|
#include <grub/xen_file.h>
|
|
#include <grub/i386/linux.h>
|
|
#include <grub/misc.h>
|
|
|
|
#include "verity-hash.h"
|
|
|
|
grub_elf_t
|
|
grub_xen_file (grub_file_t file)
|
|
{
|
|
return grub_xen_file_and_cmdline (file, NULL, 0);
|
|
}
|
|
|
|
grub_elf_t
|
|
grub_xen_file_and_cmdline (grub_file_t file,
|
|
char *cmdline,
|
|
grub_size_t cmdline_max_len)
|
|
{
|
|
grub_elf_t elf;
|
|
struct linux_kernel_header lh;
|
|
grub_file_t off_file;
|
|
|
|
elf = grub_elf_file (file, file->name);
|
|
if (elf)
|
|
return elf;
|
|
grub_errno = GRUB_ERR_NONE;
|
|
|
|
if (grub_file_seek (file, 0) == (grub_off_t) -1)
|
|
goto fail;
|
|
|
|
if (grub_file_read (file, &lh, sizeof (lh)) != sizeof (lh))
|
|
goto fail;
|
|
|
|
if (lh.boot_flag != grub_cpu_to_le16_compile_time (0xaa55)
|
|
|| lh.header != grub_cpu_to_le32_compile_time (GRUB_LINUX_MAGIC_SIGNATURE)
|
|
|| grub_le_to_cpu16 (lh.version) < 0x0208)
|
|
{
|
|
grub_error (GRUB_ERR_BAD_OS, "version too old for xen boot");
|
|
return NULL;
|
|
}
|
|
|
|
if (lh.payload_length < 4)
|
|
{
|
|
grub_error (GRUB_ERR_BAD_OS, "payload too short");
|
|
return NULL;
|
|
}
|
|
|
|
grub_dprintf ("xen", "found bzimage payload 0x%llx-0x%llx\n",
|
|
(unsigned long long) (lh.setup_sects + 1) * 512
|
|
+ lh.payload_offset,
|
|
(unsigned long long) lh.payload_length - 4);
|
|
|
|
if (cmdline)
|
|
grub_pass_verity_hash (&lh, cmdline, cmdline_max_len);
|
|
|
|
off_file = grub_file_offset_open (file, (lh.setup_sects + 1) * 512
|
|
+ lh.payload_offset,
|
|
lh.payload_length - 4);
|
|
if (!off_file)
|
|
goto fail;
|
|
|
|
elf = grub_elf_file (off_file, file->name);
|
|
if (elf)
|
|
return elf;
|
|
grub_file_offset_close (off_file);
|
|
|
|
fail:
|
|
grub_error (GRUB_ERR_BAD_OS, "not xen image");
|
|
return NULL;
|
|
}
|
|
|
|
grub_err_t
|
|
grub_xen_get_info (grub_elf_t elf, struct grub_xen_file_info * xi)
|
|
{
|
|
grub_memset (xi, 0, sizeof (*xi));
|
|
|
|
if (grub_elf_is_elf64 (elf)
|
|
&& elf->ehdr.ehdr64.e_machine
|
|
== grub_cpu_to_le16_compile_time (EM_X86_64)
|
|
&& elf->ehdr.ehdr64.e_ident[EI_DATA] == ELFDATA2LSB)
|
|
{
|
|
xi->arch = GRUB_XEN_FILE_X86_64;
|
|
return grub_xen_get_info64 (elf, xi);
|
|
}
|
|
if (grub_elf_is_elf32 (elf)
|
|
&& elf->ehdr.ehdr32.e_machine == grub_cpu_to_le16_compile_time (EM_386)
|
|
&& elf->ehdr.ehdr32.e_ident[EI_DATA] == ELFDATA2LSB)
|
|
{
|
|
xi->arch = GRUB_XEN_FILE_I386;
|
|
return grub_xen_get_info32 (elf, xi);
|
|
}
|
|
return grub_error (GRUB_ERR_BAD_OS, "unknown ELF type");
|
|
}
|