Commit e4951626 authored by Matthew Garrett's avatar Matthew Garrett Committed by Colin Watson

Add "linuxefi" loader which avoids ExitBootServices

Origin: vendor, http://pkgs.fedoraproject.org/cgit/grub2.git/tree/grub2-linuxefi.patch
Forwarded: no
Last-Update: 2014-11-18

Patch-Name: linuxefi.patch
parent 9b945075
......@@ -1705,6 +1705,14 @@ module = {
enable = x86_64_efi;
};
module = {
name = linuxefi;
efi = loader/i386/efi/linux.c;
efi = lib/cmdline.c;
enable = i386_efi;
enable = x86_64_efi;
};
module = {
name = chain;
efi = loader/efi/chainloader.c;
......
......@@ -49,6 +49,38 @@ static grub_efi_uintn_t finish_desc_size;
static grub_efi_uint32_t finish_desc_version;
int grub_efi_is_finished = 0;
/* Allocate pages below a specified address */
void *
grub_efi_allocate_pages_max (grub_efi_physical_address_t max,
grub_efi_uintn_t pages)
{
grub_efi_status_t status;
grub_efi_boot_services_t *b;
grub_efi_physical_address_t address = max;
if (max > 0xffffffff)
return 0;
b = grub_efi_system_table->boot_services;
status = efi_call_4 (b->allocate_pages, GRUB_EFI_ALLOCATE_MAX_ADDRESS, GRUB_EFI_LOADER_DATA, pages, &address);
if (status != GRUB_EFI_SUCCESS)
return 0;
if (address == 0)
{
/* Uggh, the address 0 was allocated... This is too annoying,
so reallocate another one. */
address = max;
status = efi_call_4 (b->allocate_pages, GRUB_EFI_ALLOCATE_MAX_ADDRESS, GRUB_EFI_LOADER_DATA, pages, &address);
grub_efi_free_pages (0, pages);
if (status != GRUB_EFI_SUCCESS)
return 0;
}
return (void *) ((grub_addr_t) address);
}
/* Allocate pages. Return the pointer to the first of allocated pages. */
void *
grub_efi_allocate_pages (grub_efi_physical_address_t address,
......
/*
* GRUB -- GRand Unified Bootloader
* Copyright (C) 2012 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/loader.h>
#include <grub/file.h>
#include <grub/err.h>
#include <grub/types.h>
#include <grub/mm.h>
#include <grub/cpu/linux.h>
#include <grub/command.h>
#include <grub/i18n.h>
#include <grub/lib/cmdline.h>
#include <grub/efi/efi.h>
GRUB_MOD_LICENSE ("GPLv3+");
static grub_dl_t my_mod;
static int loaded;
static void *kernel_mem;
static grub_uint64_t kernel_size;
static grub_uint8_t *initrd_mem;
static grub_uint32_t handover_offset;
struct linux_kernel_params *params;
static char *linux_cmdline;
#define BYTES_TO_PAGES(bytes) (((bytes) + 0xfff) >> 12)
#define SHIM_LOCK_GUID \
{ 0x605dab50, 0xe046, 0x4300, {0xab, 0xb6, 0x3d, 0xd8, 0x10, 0xdd, 0x8b, 0x23} }
struct grub_efi_shim_lock
{
grub_efi_status_t (*verify) (void *buffer, grub_uint32_t size);
};
typedef struct grub_efi_shim_lock grub_efi_shim_lock_t;
static grub_efi_boolean_t
grub_linuxefi_secure_validate (void *data, grub_uint32_t size)
{
grub_efi_guid_t guid = SHIM_LOCK_GUID;
grub_efi_shim_lock_t *shim_lock;
shim_lock = grub_efi_locate_protocol(&guid, NULL);
if (!shim_lock)
return 1;
if (shim_lock->verify(data, size) == GRUB_EFI_SUCCESS)
return 1;
return 0;
}
typedef void(*handover_func)(void *, grub_efi_system_table_t *, struct linux_kernel_params *);
static grub_err_t
grub_linuxefi_boot (void)
{
handover_func hf;
int offset = 0;
#ifdef __x86_64__
offset = 512;
#endif
hf = (handover_func)((char *)kernel_mem + handover_offset + offset);
asm volatile ("cli");
hf (grub_efi_image_handle, grub_efi_system_table, params);
/* Not reached */
return GRUB_ERR_NONE;
}
static grub_err_t
grub_linuxefi_unload (void)
{
grub_dl_unref (my_mod);
loaded = 0;
if (initrd_mem)
grub_efi_free_pages((grub_efi_physical_address_t)(grub_addr_t)initrd_mem, BYTES_TO_PAGES(params->ramdisk_size));
if (linux_cmdline)
grub_efi_free_pages((grub_efi_physical_address_t)(grub_addr_t)linux_cmdline, BYTES_TO_PAGES(params->cmdline_size + 1));
if (kernel_mem)
grub_efi_free_pages((grub_efi_physical_address_t)(grub_addr_t)kernel_mem, BYTES_TO_PAGES(kernel_size));
if (params)
grub_efi_free_pages((grub_efi_physical_address_t)(grub_addr_t)params, BYTES_TO_PAGES(16384));
return GRUB_ERR_NONE;
}
static grub_err_t
grub_cmd_initrd (grub_command_t cmd __attribute__ ((unused)),
int argc, char *argv[])
{
grub_file_t *files = 0;
int i, nfiles = 0;
grub_size_t size = 0;
grub_uint8_t *ptr;
if (argc == 0)
{
grub_error (GRUB_ERR_BAD_ARGUMENT, N_("filename expected"));
goto fail;
}
if (!loaded)
{
grub_error (GRUB_ERR_BAD_ARGUMENT, N_("you need to load the kernel first"));
goto fail;
}
files = grub_zalloc (argc * sizeof (files[0]));
if (!files)
goto fail;
for (i = 0; i < argc; i++)
{
grub_file_filter_disable_compression ();
files[i] = grub_file_open (argv[i]);
if (! files[i])
goto fail;
nfiles++;
size += ALIGN_UP (grub_file_size (files[i]), 4);
}
initrd_mem = grub_efi_allocate_pages_max (0x3fffffff, BYTES_TO_PAGES(size));
if (!initrd_mem)
{
grub_error (GRUB_ERR_OUT_OF_MEMORY, N_("can't allocate initrd"));
goto fail;
}
params->ramdisk_size = size;
params->ramdisk_image = (grub_uint32_t)(grub_addr_t) initrd_mem;
ptr = initrd_mem;
for (i = 0; i < nfiles; i++)
{
grub_ssize_t cursize = grub_file_size (files[i]);
if (grub_file_read (files[i], ptr, cursize) != cursize)
{
if (!grub_errno)
grub_error (GRUB_ERR_FILE_READ_ERROR, N_("premature end of file %s"),
argv[i]);
goto fail;
}
ptr += cursize;
grub_memset (ptr, 0, ALIGN_UP_OVERHEAD (cursize, 4));
ptr += ALIGN_UP_OVERHEAD (cursize, 4);
}
params->ramdisk_size = size;
fail:
for (i = 0; i < nfiles; i++)
grub_file_close (files[i]);
grub_free (files);
if (initrd_mem && grub_errno)
grub_efi_free_pages((grub_efi_physical_address_t)(grub_addr_t)initrd_mem, BYTES_TO_PAGES(size));
return grub_errno;
}
static grub_err_t
grub_cmd_linux (grub_command_t cmd __attribute__ ((unused)),
int argc, char *argv[])
{
grub_file_t file = 0;
struct linux_kernel_header lh;
grub_ssize_t len, start, filelen;
void *kernel;
grub_dl_ref (my_mod);
if (argc == 0)
{
grub_error (GRUB_ERR_BAD_ARGUMENT, N_("filename expected"));
goto fail;
}
file = grub_file_open (argv[0]);
if (! file)
goto fail;
filelen = grub_file_size (file);
kernel = grub_malloc(filelen);
if (!kernel)
{
grub_error (GRUB_ERR_OUT_OF_MEMORY, N_("cannot allocate kernel buffer"));
goto fail;
}
if (grub_file_read (file, kernel, filelen) != filelen)
{
grub_error (GRUB_ERR_FILE_READ_ERROR, N_("Can't read kernel %s"), argv[0]);
goto fail;
}
if (! grub_linuxefi_secure_validate (kernel, filelen))
{
grub_error (GRUB_ERR_INVALID_COMMAND, N_("%s has invalid signature"), argv[0]);
grub_free (kernel);
goto fail;
}
grub_file_seek (file, 0);
grub_free(kernel);
params = grub_efi_allocate_pages_max (0x3fffffff, BYTES_TO_PAGES(16384));
if (! params)
{
grub_error (GRUB_ERR_OUT_OF_MEMORY, "cannot allocate kernel parameters");
goto fail;
}
memset (params, 0, 16384);
if (grub_file_read (file, &lh, sizeof (lh)) != sizeof (lh))
{
if (!grub_errno)
grub_error (GRUB_ERR_BAD_OS, N_("premature end of file %s"),
argv[0]);
goto fail;
}
if (lh.boot_flag != grub_cpu_to_le16 (0xaa55))
{
grub_error (GRUB_ERR_BAD_OS, N_("invalid magic number"));
goto fail;
}
if (lh.setup_sects > GRUB_LINUX_MAX_SETUP_SECTS)
{
grub_error (GRUB_ERR_BAD_OS, N_("too many setup sectors"));
goto fail;
}
if (lh.version < grub_cpu_to_le16 (0x020b))
{
grub_error (GRUB_ERR_BAD_OS, N_("kernel too old"));
goto fail;
}
if (!lh.handover_offset)
{
grub_error (GRUB_ERR_BAD_OS, N_("kernel doesn't support EFI handover"));
goto fail;
}
linux_cmdline = grub_efi_allocate_pages_max(0x3fffffff,
BYTES_TO_PAGES(lh.cmdline_size + 1));
if (!linux_cmdline)
{
grub_error (GRUB_ERR_OUT_OF_MEMORY, N_("can't allocate cmdline"));
goto fail;
}
grub_memcpy (linux_cmdline, LINUX_IMAGE, sizeof (LINUX_IMAGE));
grub_create_loader_cmdline (argc, argv,
linux_cmdline + sizeof (LINUX_IMAGE) - 1,
lh.cmdline_size - (sizeof (LINUX_IMAGE) - 1));
lh.cmd_line_ptr = (grub_uint32_t)(grub_addr_t)linux_cmdline;
handover_offset = lh.handover_offset;
start = (lh.setup_sects + 1) * 512;
len = grub_file_size(file) - start;
kernel_mem = grub_efi_allocate_pages(lh.pref_address,
BYTES_TO_PAGES(lh.init_size));
if (!kernel_mem)
kernel_mem = grub_efi_allocate_pages_max(0x3fffffff,
BYTES_TO_PAGES(lh.init_size));
if (!kernel_mem)
{
grub_error (GRUB_ERR_OUT_OF_MEMORY, N_("can't allocate kernel"));
goto fail;
}
if (grub_file_seek (file, start) == (grub_off_t) -1)
{
grub_error (GRUB_ERR_BAD_OS, N_("premature end of file %s"),
argv[0]);
goto fail;
}
if (grub_file_read (file, kernel_mem, len) != len && !grub_errno)
{
grub_error (GRUB_ERR_BAD_OS, N_("premature end of file %s"),
argv[0]);
}
if (grub_errno == GRUB_ERR_NONE)
{
grub_loader_set (grub_linuxefi_boot, grub_linuxefi_unload, 0);
loaded = 1;
lh.code32_start = (grub_uint32_t)(grub_addr_t) kernel_mem;
}
memcpy(params, &lh, 2 * 512);
params->type_of_loader = 0x21;
fail:
if (file)
grub_file_close (file);
if (grub_errno != GRUB_ERR_NONE)
{
grub_dl_unref (my_mod);
loaded = 0;
}
if (linux_cmdline && !loaded)
grub_efi_free_pages((grub_efi_physical_address_t)(grub_addr_t)linux_cmdline, BYTES_TO_PAGES(lh.cmdline_size + 1));
if (kernel_mem && !loaded)
grub_efi_free_pages((grub_efi_physical_address_t)(grub_addr_t)kernel_mem, BYTES_TO_PAGES(kernel_size));
if (params && !loaded)
grub_efi_free_pages((grub_efi_physical_address_t)(grub_addr_t)params, BYTES_TO_PAGES(16384));
return grub_errno;
}
static grub_command_t cmd_linux, cmd_initrd;
GRUB_MOD_INIT(linuxefi)
{
cmd_linux =
grub_register_command ("linuxefi", grub_cmd_linux,
0, N_("Load Linux."));
cmd_initrd =
grub_register_command ("initrdefi", grub_cmd_initrd,
0, N_("Load initrd."));
my_mod = mod;
}
GRUB_MOD_FINI(linuxefi)
{
grub_unregister_command (cmd_linux);
grub_unregister_command (cmd_initrd);
}
......@@ -40,6 +40,9 @@ void EXPORT_FUNC(grub_efi_stall) (grub_efi_uintn_t microseconds);
void *
EXPORT_FUNC(grub_efi_allocate_pages) (grub_efi_physical_address_t address,
grub_efi_uintn_t pages);
void *
EXPORT_FUNC(grub_efi_allocate_pages_max) (grub_efi_physical_address_t max,
grub_efi_uintn_t pages);
void EXPORT_FUNC(grub_efi_free_pages) (grub_efi_physical_address_t address,
grub_efi_uintn_t pages);
int
......
......@@ -139,6 +139,7 @@ struct linux_kernel_header
grub_uint64_t setup_data;
grub_uint64_t pref_address;
grub_uint32_t init_size;
grub_uint32_t handover_offset;
} GRUB_PACKED;
/* Boot parameters for Linux based on 2.6.12. This is used by the setup
......
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