grub/grub-core/loader/arm64/linux.c
Vladimir Serbinenko 4d4a8c96e3 verifiers: Add possibility to verify kernel and modules command lines
Signed-off-by: Vladimir Serbinenko <phcoder@gmail.com>
Signed-off-by: Daniel Kiper <daniel.kiper@oracle.com>
Reviewed-by: Ross Philipson <ross.philipson@oracle.com>
2018-11-09 13:25:31 +01:00

392 lines
10 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/charset.h>
#include <grub/command.h>
#include <grub/err.h>
#include <grub/file.h>
#include <grub/fdt.h>
#include <grub/linux.h>
#include <grub/loader.h>
#include <grub/mm.h>
#include <grub/types.h>
#include <grub/cpu/linux.h>
#include <grub/efi/efi.h>
#include <grub/efi/fdtload.h>
#include <grub/efi/memory.h>
#include <grub/efi/pe32.h>
#include <grub/i18n.h>
#include <grub/lib/cmdline.h>
#include <grub/verify.h>
GRUB_MOD_LICENSE ("GPLv3+");
static grub_dl_t my_mod;
static int loaded;
static void *kernel_addr;
static grub_uint64_t kernel_size;
static char *linux_args;
static grub_uint32_t cmdline_size;
static grub_addr_t initrd_start;
static grub_addr_t initrd_end;
grub_err_t
grub_armxx_efi_linux_check_image (struct linux_armxx_kernel_header * lh)
{
if (lh->magic != GRUB_LINUX_ARMXX_MAGIC_SIGNATURE)
return grub_error(GRUB_ERR_BAD_OS, "invalid magic number");
if ((lh->code0 & 0xffff) != GRUB_PE32_MAGIC)
return grub_error (GRUB_ERR_NOT_IMPLEMENTED_YET,
N_("plain image kernel not supported - rebuild with CONFIG_(U)EFI_STUB enabled"));
grub_dprintf ("linux", "UEFI stub kernel:\n");
grub_dprintf ("linux", "PE/COFF header @ %08x\n", lh->hdr_offset);
return GRUB_ERR_NONE;
}
static grub_err_t
finalize_params_linux (void)
{
int node, retval;
void *fdt;
fdt = grub_fdt_load (0x400);
if (!fdt)
goto failure;
node = grub_fdt_find_subnode (fdt, 0, "chosen");
if (node < 0)
node = grub_fdt_add_subnode (fdt, 0, "chosen");
if (node < 1)
goto failure;
/* Set initrd info */
if (initrd_start && initrd_end > initrd_start)
{
grub_dprintf ("linux", "Initrd @ %p-%p\n",
(void *) initrd_start, (void *) initrd_end);
retval = grub_fdt_set_prop64 (fdt, node, "linux,initrd-start",
initrd_start);
if (retval)
goto failure;
retval = grub_fdt_set_prop64 (fdt, node, "linux,initrd-end",
initrd_end);
if (retval)
goto failure;
}
if (grub_fdt_install() != GRUB_ERR_NONE)
goto failure;
return GRUB_ERR_NONE;
failure:
grub_fdt_unload();
return grub_error(GRUB_ERR_BAD_OS, "failed to install/update FDT");
}
grub_err_t
grub_armxx_efi_linux_boot_image (grub_addr_t addr, grub_size_t size, char *args)
{
grub_efi_memory_mapped_device_path_t *mempath;
grub_efi_handle_t image_handle;
grub_efi_boot_services_t *b;
grub_efi_status_t status;
grub_efi_loaded_image_t *loaded_image;
int len;
mempath = grub_malloc (2 * sizeof (grub_efi_memory_mapped_device_path_t));
if (!mempath)
return grub_errno;
mempath[0].header.type = GRUB_EFI_HARDWARE_DEVICE_PATH_TYPE;
mempath[0].header.subtype = GRUB_EFI_MEMORY_MAPPED_DEVICE_PATH_SUBTYPE;
mempath[0].header.length = grub_cpu_to_le16_compile_time (sizeof (*mempath));
mempath[0].memory_type = GRUB_EFI_LOADER_DATA;
mempath[0].start_address = addr;
mempath[0].end_address = addr + size;
mempath[1].header.type = GRUB_EFI_END_DEVICE_PATH_TYPE;
mempath[1].header.subtype = GRUB_EFI_END_ENTIRE_DEVICE_PATH_SUBTYPE;
mempath[1].header.length = sizeof (grub_efi_device_path_t);
b = grub_efi_system_table->boot_services;
status = b->load_image (0, grub_efi_image_handle,
(grub_efi_device_path_t *) mempath,
(void *) addr, size, &image_handle);
if (status != GRUB_EFI_SUCCESS)
return grub_error (GRUB_ERR_BAD_OS, "cannot load image");
grub_dprintf ("linux", "linux command line: '%s'\n", args);
/* Convert command line to UCS-2 */
loaded_image = grub_efi_get_loaded_image (image_handle);
loaded_image->load_options_size = len =
(grub_strlen (args) + 1) * sizeof (grub_efi_char16_t);
loaded_image->load_options =
grub_efi_allocate_any_pages (GRUB_EFI_BYTES_TO_PAGES (loaded_image->load_options_size));
if (!loaded_image->load_options)
return grub_errno;
loaded_image->load_options_size =
2 * grub_utf8_to_utf16 (loaded_image->load_options, len,
(grub_uint8_t *) args, len, NULL);
grub_dprintf ("linux", "starting image %p\n", image_handle);
status = b->start_image (image_handle, 0, NULL);
/* When successful, not reached */
b->unload_image (image_handle);
grub_efi_free_pages ((grub_addr_t) loaded_image->load_options,
GRUB_EFI_BYTES_TO_PAGES (loaded_image->load_options_size));
return grub_errno;
}
static grub_err_t
grub_linux_boot (void)
{
if (finalize_params_linux () != GRUB_ERR_NONE)
return grub_errno;
return (grub_armxx_efi_linux_boot_image((grub_addr_t)kernel_addr,
kernel_size, linux_args));
}
static grub_err_t
grub_linux_unload (void)
{
grub_dl_unref (my_mod);
loaded = 0;
if (initrd_start)
grub_efi_free_pages ((grub_efi_physical_address_t) initrd_start,
GRUB_EFI_BYTES_TO_PAGES (initrd_end - initrd_start));
initrd_start = initrd_end = 0;
grub_free (linux_args);
if (kernel_addr)
grub_efi_free_pages ((grub_addr_t) kernel_addr,
GRUB_EFI_BYTES_TO_PAGES (kernel_size));
grub_fdt_unload ();
return GRUB_ERR_NONE;
}
/*
* As per linux/Documentation/arm/Booting
* ARM initrd needs to be covered by kernel linear mapping,
* so place it in the first 512MB of DRAM.
*
* As per linux/Documentation/arm64/booting.txt
* ARM64 initrd needs to be contained entirely within a 1GB aligned window
* of up to 32GB of size that covers the kernel image as well.
* Since the EFI stub loader will attempt to load the kernel near start of
* RAM, place the buffer in the first 32GB of RAM.
*/
#ifdef __arm__
#define INITRD_MAX_ADDRESS_OFFSET (512U * 1024 * 1024)
#else /* __aarch64__ */
#define INITRD_MAX_ADDRESS_OFFSET (32ULL * 1024 * 1024 * 1024)
#endif
/*
* This function returns a pointer to a legally allocated initrd buffer,
* or NULL if unsuccessful
*/
static void *
allocate_initrd_mem (int initrd_pages)
{
grub_addr_t max_addr;
if (grub_efi_get_ram_base (&max_addr) != GRUB_ERR_NONE)
return NULL;
max_addr += INITRD_MAX_ADDRESS_OFFSET - 1;
return grub_efi_allocate_pages_real (max_addr, initrd_pages,
GRUB_EFI_ALLOCATE_MAX_ADDRESS,
GRUB_EFI_LOADER_DATA);
}
static grub_err_t
grub_cmd_initrd (grub_command_t cmd __attribute__ ((unused)),
int argc, char *argv[])
{
struct grub_linux_initrd_context initrd_ctx = { 0, 0, 0 };
int initrd_size, initrd_pages;
void *initrd_mem = NULL;
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;
}
if (grub_initrd_init (argc, argv, &initrd_ctx))
goto fail;
initrd_size = grub_get_initrd_size (&initrd_ctx);
grub_dprintf ("linux", "Loading initrd\n");
initrd_pages = (GRUB_EFI_BYTES_TO_PAGES (initrd_size));
initrd_mem = allocate_initrd_mem (initrd_pages);
if (!initrd_mem)
{
grub_error (GRUB_ERR_OUT_OF_MEMORY, N_("out of memory"));
goto fail;
}
if (grub_initrd_load (&initrd_ctx, argv, initrd_mem))
goto fail;
initrd_start = (grub_addr_t) initrd_mem;
initrd_end = initrd_start + initrd_size;
grub_dprintf ("linux", "[addr=%p, size=0x%x]\n",
(void *) initrd_start, initrd_size);
fail:
grub_initrd_close (&initrd_ctx);
if (initrd_mem && !initrd_start)
grub_efi_free_pages ((grub_addr_t) initrd_mem, initrd_pages);
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_armxx_kernel_header lh;
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;
kernel_size = grub_file_size (file);
if (grub_file_read (file, &lh, sizeof (lh)) < (long) sizeof (lh))
return grub_errno;
if (grub_armxx_efi_linux_check_image (&lh) != GRUB_ERR_NONE)
goto fail;
grub_loader_unset();
grub_dprintf ("linux", "kernel file size: %lld\n", (long long) kernel_size);
kernel_addr = grub_efi_allocate_any_pages (GRUB_EFI_BYTES_TO_PAGES (kernel_size));
grub_dprintf ("linux", "kernel numpages: %lld\n",
(long long) GRUB_EFI_BYTES_TO_PAGES (kernel_size));
if (!kernel_addr)
{
grub_error (GRUB_ERR_OUT_OF_MEMORY, N_("out of memory"));
goto fail;
}
grub_file_seek (file, 0);
if (grub_file_read (file, kernel_addr, kernel_size)
< (grub_int64_t) kernel_size)
{
if (!grub_errno)
grub_error (GRUB_ERR_BAD_OS, N_("premature end of file %s"), argv[0]);
goto fail;
}
grub_dprintf ("linux", "kernel @ %p\n", kernel_addr);
cmdline_size = grub_loader_cmdline_size (argc, argv) + sizeof (LINUX_IMAGE);
linux_args = grub_malloc (cmdline_size);
if (!linux_args)
{
grub_error (GRUB_ERR_OUT_OF_MEMORY, N_("out of memory"));
goto fail;
}
grub_memcpy (linux_args, LINUX_IMAGE, sizeof (LINUX_IMAGE));
err = grub_create_loader_cmdline (argc, argv,
linux_args + sizeof (LINUX_IMAGE) - 1,
cmdline_size,
GRUB_VERIFY_KERNEL_CMDLINE);
if (err)
goto fail;
if (grub_errno == GRUB_ERR_NONE)
{
grub_loader_set (grub_linux_boot, grub_linux_unload, 0);
loaded = 1;
}
fail:
if (file)
grub_file_close (file);
if (grub_errno != GRUB_ERR_NONE)
{
grub_dl_unref (my_mod);
loaded = 0;
}
if (linux_args && !loaded)
grub_free (linux_args);
if (kernel_addr && !loaded)
grub_efi_free_pages ((grub_addr_t) kernel_addr,
GRUB_EFI_BYTES_TO_PAGES (kernel_size));
return grub_errno;
}
static grub_command_t cmd_linux, cmd_initrd;
GRUB_MOD_INIT (linux)
{
cmd_linux = grub_register_command ("linux", grub_cmd_linux, 0,
N_("Load Linux."));
cmd_initrd = grub_register_command ("initrd", grub_cmd_initrd, 0,
N_("Load initrd."));
my_mod = mod;
}
GRUB_MOD_FINI (linux)
{
grub_unregister_command (cmd_linux);
grub_unregister_command (cmd_initrd);
}