grub/grub-core/loader/ia64/efi/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

608 lines
16 KiB
C

/*
* GRUB -- GRand Unified Bootloader
* Copyright (C) 2008,2010 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/disk.h>
#include <grub/err.h>
#include <grub/misc.h>
#include <grub/types.h>
#include <grub/command.h>
#include <grub/dl.h>
#include <grub/mm.h>
#include <grub/cache.h>
#include <grub/kernel.h>
#include <grub/efi/api.h>
#include <grub/efi/efi.h>
#include <grub/elf.h>
#include <grub/i18n.h>
#include <grub/env.h>
#include <grub/linux.h>
#include <grub/verify.h>
GRUB_MOD_LICENSE ("GPLv3+");
#pragma GCC diagnostic ignored "-Wcast-align"
#define ALIGN_MIN (256*1024*1024)
#define GRUB_ELF_SEARCH 1024
#define BOOT_PARAM_SIZE 16384
struct ia64_boot_param
{
grub_uint64_t command_line; /* physical address of command line. */
grub_uint64_t efi_systab; /* physical address of EFI system table */
grub_uint64_t efi_memmap; /* physical address of EFI memory map */
grub_uint64_t efi_memmap_size; /* size of EFI memory map */
grub_uint64_t efi_memdesc_size; /* size of an EFI memory map descriptor */
grub_uint32_t efi_memdesc_version; /* memory descriptor version */
struct
{
grub_uint16_t num_cols; /* number of columns on console output dev */
grub_uint16_t num_rows; /* number of rows on console output device */
grub_uint16_t orig_x; /* cursor's x position */
grub_uint16_t orig_y; /* cursor's y position */
} console_info;
grub_uint64_t fpswa; /* physical address of the fpswa interface */
grub_uint64_t initrd_start;
grub_uint64_t initrd_size;
};
typedef struct
{
grub_uint32_t revision;
grub_uint32_t reserved;
void *fpswa;
} fpswa_interface_t;
static fpswa_interface_t *fpswa;
#define NEXT_MEMORY_DESCRIPTOR(desc, size) \
((grub_efi_memory_descriptor_t *) ((char *) (desc) + (size)))
static grub_dl_t my_mod;
static int loaded;
/* Kernel base and size. */
static void *kernel_mem;
static grub_efi_uintn_t kernel_pages;
static grub_uint64_t entry;
/* Initrd base and size. */
static void *initrd_mem;
static grub_efi_uintn_t initrd_pages;
static grub_efi_uintn_t initrd_size;
static struct ia64_boot_param *boot_param;
static grub_efi_uintn_t boot_param_pages;
static inline grub_size_t
page_align (grub_size_t size)
{
return (size + (1 << 12) - 1) & (~((1 << 12) - 1));
}
static void
query_fpswa (void)
{
grub_efi_handle_t fpswa_image;
grub_efi_boot_services_t *bs;
grub_efi_status_t status;
grub_efi_uintn_t size;
static const grub_efi_guid_t fpswa_protocol =
{ 0xc41b6531, 0x97b9, 0x11d3,
{0x9a, 0x29, 0x0, 0x90, 0x27, 0x3f, 0xc1, 0x4d} };
if (fpswa != NULL)
return;
size = sizeof(grub_efi_handle_t);
bs = grub_efi_system_table->boot_services;
status = bs->locate_handle (GRUB_EFI_BY_PROTOCOL,
(void *) &fpswa_protocol,
NULL, &size, &fpswa_image);
if (status != GRUB_EFI_SUCCESS)
{
grub_printf ("%s\n", _("Could not locate FPSWA driver"));
return;
}
status = bs->handle_protocol (fpswa_image,
(void *) &fpswa_protocol, (void *) &fpswa);
if (status != GRUB_EFI_SUCCESS)
{
grub_printf ("%s\n",
_("FPSWA protocol wasn't able to find the interface"));
return;
}
}
static void
free_pages (void)
{
if (kernel_mem)
{
grub_efi_free_pages ((grub_addr_t) kernel_mem, kernel_pages);
kernel_mem = 0;
}
if (initrd_mem)
{
grub_efi_free_pages ((grub_addr_t) initrd_mem, initrd_pages);
initrd_mem = 0;
}
if (boot_param)
{
/* Free bootparam. */
grub_efi_free_pages ((grub_efi_physical_address_t) boot_param,
boot_param_pages);
boot_param = 0;
}
}
static void *
allocate_pages (grub_uint64_t align, grub_uint64_t size_pages,
grub_uint64_t nobase)
{
grub_uint64_t size;
grub_efi_uintn_t desc_size;
grub_efi_memory_descriptor_t *mmap, *mmap_end;
grub_efi_uintn_t mmap_size, tmp_mmap_size;
grub_efi_memory_descriptor_t *desc;
void *mem = NULL;
size = size_pages << 12;
mmap_size = grub_efi_find_mmap_size ();
if (!mmap_size)
return 0;
/* Read the memory map temporarily, to find free space. */
mmap = grub_malloc (mmap_size);
if (! mmap)
return 0;
tmp_mmap_size = mmap_size;
if (grub_efi_get_memory_map (&tmp_mmap_size, mmap, 0, &desc_size, 0) <= 0)
{
grub_error (GRUB_ERR_IO, "cannot get memory map");
goto fail;
}
mmap_end = NEXT_MEMORY_DESCRIPTOR (mmap, tmp_mmap_size);
/* First, find free pages for the real mode code
and the memory map buffer. */
for (desc = mmap;
desc < mmap_end;
desc = NEXT_MEMORY_DESCRIPTOR (desc, desc_size))
{
grub_uint64_t start, end;
grub_uint64_t aligned_start;
if (desc->type != GRUB_EFI_CONVENTIONAL_MEMORY)
continue;
start = desc->physical_start;
end = start + (desc->num_pages << 12);
/* Align is a power of 2. */
aligned_start = (start + align - 1) & ~(align - 1);
if (aligned_start + size > end)
continue;
if (aligned_start == nobase)
aligned_start += align;
if (aligned_start + size > end)
continue;
mem = grub_efi_allocate_fixed (aligned_start, size_pages);
if (! mem)
{
grub_error (GRUB_ERR_OUT_OF_MEMORY, "cannot allocate memory");
goto fail;
}
break;
}
if (! mem)
{
grub_error (GRUB_ERR_OUT_OF_MEMORY, "cannot allocate memory");
goto fail;
}
grub_free (mmap);
return mem;
fail:
grub_free (mmap);
free_pages ();
return 0;
}
static void
set_boot_param_console (void)
{
grub_efi_simple_text_output_interface_t *conout;
grub_efi_uintn_t cols, rows;
conout = grub_efi_system_table->con_out;
if (conout->query_mode (conout, conout->mode->mode, &cols, &rows)
!= GRUB_EFI_SUCCESS)
return;
grub_dprintf ("linux",
"Console info: cols=%lu rows=%lu x=%u y=%u\n",
cols, rows,
conout->mode->cursor_column, conout->mode->cursor_row);
boot_param->console_info.num_cols = cols;
boot_param->console_info.num_rows = rows;
boot_param->console_info.orig_x = conout->mode->cursor_column;
boot_param->console_info.orig_y = conout->mode->cursor_row;
}
static grub_err_t
grub_linux_boot (void)
{
grub_efi_uintn_t mmap_size;
grub_efi_uintn_t map_key;
grub_efi_uintn_t desc_size;
grub_efi_uint32_t desc_version;
grub_efi_memory_descriptor_t *mmap_buf;
grub_err_t err;
/* FPSWA. */
query_fpswa ();
boot_param->fpswa = (grub_uint64_t)fpswa;
/* Initrd. */
boot_param->initrd_start = (grub_uint64_t)initrd_mem;
boot_param->initrd_size = (grub_uint64_t)initrd_size;
set_boot_param_console ();
grub_dprintf ("linux", "Jump to %016lx\n", entry);
/* MDT.
Must be done after grub_machine_fini because map_key is used by
exit_boot_services. */
mmap_size = grub_efi_find_mmap_size ();
if (! mmap_size)
return grub_errno;
mmap_buf = grub_efi_allocate_any_pages (page_align (mmap_size) >> 12);
if (! mmap_buf)
return grub_error (GRUB_ERR_IO, "cannot allocate memory map");
err = grub_efi_finish_boot_services (&mmap_size, mmap_buf, &map_key,
&desc_size, &desc_version);
if (err)
return err;
boot_param->efi_memmap = (grub_uint64_t)mmap_buf;
boot_param->efi_memmap_size = mmap_size;
boot_param->efi_memdesc_size = desc_size;
boot_param->efi_memdesc_version = desc_version;
/* See you next boot. */
asm volatile ("mov r28=%1; br.sptk.few %0" :: "b"(entry),"r"(boot_param));
/* Never reach here. */
return GRUB_ERR_NONE;
}
static grub_err_t
grub_linux_unload (void)
{
free_pages ();
grub_dl_unref (my_mod);
loaded = 0;
return GRUB_ERR_NONE;
}
static grub_err_t
grub_load_elf64 (grub_file_t file, void *buffer, const char *filename)
{
Elf64_Ehdr *ehdr = (Elf64_Ehdr *) buffer;
Elf64_Phdr *phdr;
int i;
grub_uint64_t low_addr;
grub_uint64_t high_addr;
grub_uint64_t align;
grub_uint64_t reloc_offset;
const char *relocate;
if (ehdr->e_ident[EI_MAG0] != ELFMAG0
|| ehdr->e_ident[EI_MAG1] != ELFMAG1
|| ehdr->e_ident[EI_MAG2] != ELFMAG2
|| ehdr->e_ident[EI_MAG3] != ELFMAG3
|| ehdr->e_ident[EI_DATA] != ELFDATA2LSB)
return grub_error(GRUB_ERR_UNKNOWN_OS,
N_("invalid arch-independent ELF magic"));
if (ehdr->e_ident[EI_CLASS] != ELFCLASS64
|| ehdr->e_version != EV_CURRENT
|| ehdr->e_machine != EM_IA_64)
return grub_error (GRUB_ERR_UNKNOWN_OS,
N_("invalid arch-dependent ELF magic"));
if (ehdr->e_type != ET_EXEC)
return grub_error (GRUB_ERR_UNKNOWN_OS,
N_("this ELF file is not of the right type"));
/* FIXME: Should we support program headers at strange locations? */
if (ehdr->e_phoff + ehdr->e_phnum * ehdr->e_phentsize > GRUB_ELF_SEARCH)
return grub_error (GRUB_ERR_BAD_OS, "program header at a too high offset");
entry = ehdr->e_entry;
/* Compute low, high and align addresses. */
low_addr = ~0UL;
high_addr = 0;
align = 0;
for (i = 0; i < ehdr->e_phnum; i++)
{
phdr = (Elf64_Phdr *) ((char *) buffer + ehdr->e_phoff
+ i * ehdr->e_phentsize);
if (phdr->p_type == PT_LOAD)
{
if (phdr->p_paddr < low_addr)
low_addr = phdr->p_paddr;
if (phdr->p_paddr + phdr->p_memsz > high_addr)
high_addr = phdr->p_paddr + phdr->p_memsz;
if (phdr->p_align > align)
align = phdr->p_align;
}
}
if (align < ALIGN_MIN)
align = ALIGN_MIN;
if (high_addr == 0)
return grub_error (GRUB_ERR_BAD_OS, "no program entries");
kernel_pages = page_align (high_addr - low_addr) >> 12;
/* Undocumented on purpose. */
relocate = grub_env_get ("linux_relocate");
if (!relocate || grub_strcmp (relocate, "force") != 0)
{
kernel_mem = grub_efi_allocate_fixed (low_addr, kernel_pages);
reloc_offset = 0;
}
/* Try to relocate. */
if (! kernel_mem && (!relocate || grub_strcmp (relocate, "off") != 0))
{
kernel_mem = allocate_pages (align, kernel_pages, low_addr);
if (kernel_mem)
{
reloc_offset = (grub_uint64_t)kernel_mem - low_addr;
grub_dprintf ("linux", " Relocated at %p (offset=%016lx)\n",
kernel_mem, reloc_offset);
entry += reloc_offset;
}
}
if (! kernel_mem)
return grub_error (GRUB_ERR_OUT_OF_MEMORY,
"cannot allocate memory for OS");
/* Load every loadable segment in memory. */
for (i = 0; i < ehdr->e_phnum; i++)
{
phdr = (Elf64_Phdr *) ((char *) buffer + ehdr->e_phoff
+ i * ehdr->e_phentsize);
if (phdr->p_type == PT_LOAD)
{
grub_dprintf ("linux", " [paddr=%lx load=%lx memsz=%08lx "
"off=%lx flags=%x]\n",
phdr->p_paddr, phdr->p_paddr + reloc_offset,
phdr->p_memsz, phdr->p_offset, phdr->p_flags);
if (grub_file_seek (file, phdr->p_offset) == (grub_off_t)-1)
return grub_errno;
if (grub_file_read (file, (void *) (phdr->p_paddr + reloc_offset),
phdr->p_filesz)
!= (grub_ssize_t) phdr->p_filesz)
{
if (!grub_errno)
grub_error (GRUB_ERR_BAD_OS, N_("premature end of file %s"),
filename);
return grub_errno;
}
if (phdr->p_filesz < phdr->p_memsz)
grub_memset
((char *)(phdr->p_paddr + reloc_offset + phdr->p_filesz),
0, phdr->p_memsz - phdr->p_filesz);
/* Sync caches if necessary. */
if (phdr->p_flags & PF_X)
grub_arch_sync_caches
((void *)(phdr->p_paddr + reloc_offset), phdr->p_memsz);
}
}
loaded = 1;
return 0;
}
static grub_err_t
grub_cmd_linux (grub_command_t cmd __attribute__ ((unused)),
int argc, char *argv[])
{
grub_file_t file = 0;
char buffer[GRUB_ELF_SEARCH];
char *cmdline, *p;
grub_ssize_t len;
int i;
grub_dl_ref (my_mod);
grub_loader_unset ();
if (argc == 0)
{
grub_error (GRUB_ERR_BAD_ARGUMENT, N_("filename expected"));
goto fail;
}
file = grub_file_open (argv[0]);
if (! file)
goto fail;
len = grub_file_read (file, buffer, sizeof (buffer));
if (len < (grub_ssize_t) sizeof (Elf64_Ehdr))
{
if (!grub_errno)
grub_error (GRUB_ERR_BAD_OS, N_("premature end of file %s"),
argv[0]);
goto fail;
}
grub_dprintf ("linux", "Loading linux: %s\n", argv[0]);
if (grub_load_elf64 (file, buffer, argv[0]))
goto fail;
len = sizeof("BOOT_IMAGE=") + 8;
for (i = 0; i < argc; i++)
len += grub_strlen (argv[i]) + 1;
len += sizeof (struct ia64_boot_param) + 512; /* Room for extensions. */
boot_param_pages = page_align (len) >> 12;
boot_param = grub_efi_allocate_any_pages (boot_param_pages);
if (boot_param == 0)
{
grub_error (GRUB_ERR_OUT_OF_MEMORY,
"cannot allocate memory for bootparams");
goto fail;
}
grub_memset (boot_param, 0, len);
cmdline = ((char *)(boot_param + 1)) + 256;
/* Build cmdline. */
p = grub_stpcpy (cmdline, "BOOT_IMAGE");
for (i = 0; i < argc; i++)
{
*p++ = ' ';
p = grub_stpcpy (p, argv[i]);
}
cmdline[10] = '=';
*p = '\0';
err = grub_verify_string (cmdline, GRUB_VERIFY_KERNEL_CMDLINE);
if (err)
goto fail;
boot_param->command_line = (grub_uint64_t) cmdline;
boot_param->efi_systab = (grub_uint64_t) grub_efi_system_table;
grub_errno = GRUB_ERR_NONE;
grub_loader_set (grub_linux_boot, grub_linux_unload, 0);
fail:
if (file)
grub_file_close (file);
if (grub_errno != GRUB_ERR_NONE)
{
grub_efi_free_pages ((grub_efi_physical_address_t) boot_param,
boot_param_pages);
grub_dl_unref (my_mod);
}
return grub_errno;
}
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 };
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 = (page_align (initrd_size) >> 12);
initrd_mem = grub_efi_allocate_any_pages (initrd_pages);
if (! initrd_mem)
{
grub_error (GRUB_ERR_OUT_OF_MEMORY, "cannot allocate pages");
goto fail;
}
grub_dprintf ("linux", "[addr=0x%lx, size=0x%lx]\n",
(grub_uint64_t) initrd_mem, initrd_size);
if (grub_initrd_load (&initrd_ctx, argv, initrd_mem))
goto fail;
fail:
grub_initrd_close (&initrd_ctx);
return grub_errno;
}
static grub_err_t
grub_cmd_fpswa (grub_command_t cmd __attribute__ ((unused)),
int argc __attribute__((unused)),
char *argv[] __attribute__((unused)))
{
query_fpswa ();
if (fpswa == NULL)
grub_puts_ (N_("No FPSWA found"));
else
grub_printf (_("FPSWA revision: %x\n"), fpswa->revision);
return GRUB_ERR_NONE;
}
static grub_command_t cmd_linux, cmd_initrd, cmd_fpswa;
GRUB_MOD_INIT(linux)
{
cmd_linux = grub_register_command ("linux", grub_cmd_linux,
N_("FILE [ARGS...]"), N_("Load Linux."));
cmd_initrd = grub_register_command ("initrd", grub_cmd_initrd,
N_("FILE"), N_("Load initrd."));
cmd_fpswa = grub_register_command ("fpswa", grub_cmd_fpswa,
"", N_("Display FPSWA version."));
my_mod = mod;
}
GRUB_MOD_FINI(linux)
{
grub_unregister_command (cmd_linux);
grub_unregister_command (cmd_initrd);
grub_unregister_command (cmd_fpswa);
}