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/* init.c - generic EFI initialization and finalization */
/*
* GRUB -- GRand Unified Bootloader
* Copyright (C) 2006,2007 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/efi/efi.h>
#include <grub/efi/console.h>
#include <grub/efi/debug.h>
#include <grub/efi/disk.h>
#include <grub/efi/sb.h>
#include <grub/lockdown.h>
#include <grub/term.h>
#include <grub/misc.h>
#include <grub/env.h>
#include <grub/mm.h>
#include <grub/kernel.h>
#include <grub/stack_protector.h>
#ifdef GRUB_STACK_PROTECTOR
static grub_efi_char16_t stack_chk_fail_msg[] =
L"* GRUB: STACK SMASHING DETECTED!!! *\r\n"
L"* GRUB: ABORTED!!! *\r\n"
L"* GRUB: REBOOTING IN 5 SECONDS... *\r\n";
static grub_guid_t rng_protocol_guid = GRUB_EFI_RNG_PROTOCOL_GUID;
/* Initialize canary in case there is no RNG protocol. */
grub_addr_t __stack_chk_guard = (grub_addr_t) GRUB_STACK_PROTECTOR_INIT;
void __attribute__ ((noreturn))
__stack_chk_fail (void)
{
grub_efi_simple_text_output_interface_t *o;
/*
* Use ConOut here rather than StdErr. StdErr only goes to
* the serial console, at least on EDK2.
*/
o = grub_efi_system_table->con_out;
o->output_string (o, stack_chk_fail_msg);
grub_efi_system_table->boot_services->stall (5000000);
grub_efi_system_table->runtime_services->reset_system (GRUB_EFI_RESET_SHUTDOWN,
GRUB_EFI_ABORTED, 0, NULL);
/*
* We shouldn't get here. It's unsafe to return because the stack
* is compromised and this function is noreturn, so just busy
* loop forever.
*/
do
{
/* Do not optimize out the loop. */
asm volatile ("");
}
while (1);
}
grub_addr_t
grub_stack_protector_init (void)
{
grub_efi_rng_protocol_t *rng;
/* Set up the stack canary. Make errors here non-fatal for now. */
rng = grub_efi_locate_protocol (&rng_protocol_guid, NULL);
if (rng != NULL)
{
grub_efi_status_t status;
grub_addr_t guard = 0;
status = rng->get_rng (rng, NULL, sizeof (guard) - 1,
(grub_efi_uint8_t *) &guard);
if (status == GRUB_EFI_SUCCESS)
return guard;
}
return 0;
}
#endif
grub_addr_t grub_modbase;
void
grub_efi_init (void)
{
grub_modbase = grub_efi_section_addr ("mods");
/* First of all, initialize the console so that GRUB can display
messages. */
grub_console_init ();
/* Initialize the memory management system. */
grub_efi_mm_init ();
/*
* Lockdown the GRUB and register the shim_lock verifier
* if the UEFI Secure Boot is enabled.
*/
if (grub_efi_get_secureboot () == GRUB_EFI_SECUREBOOT_MODE_ENABLED)
{
grub_lockdown ();
grub_shim_lock_verifier_setup ();
}
grub_efi_system_table->boot_services->set_watchdog_timer (0, 0, 0, NULL);
grub_efidisk_init ();
grub_efi_register_debug_commands ();
}
void (*grub_efi_net_config) (grub_efi_handle_t hnd,
char **device,
char **path);
void
grub_machine_get_bootlocation (char **device, char **path)
{
grub_efi_loaded_image_t *image = NULL;
char *p;
image = grub_efi_get_loaded_image (grub_efi_image_handle);
if (!image)
return;
*device = grub_efidisk_get_device_name (image->device_handle);
if (!*device && grub_efi_net_config)
{
grub_efi_net_config (image->device_handle, device, path);
return;
}
*path = grub_efi_get_filename (image->file_path);
if (*path)
{
/* Get the directory. */
p = grub_strrchr (*path, '/');
if (p)
*p = '\0';
}
}
void
grub_efi_fini (void)
{
grub_efidisk_fini ();
grub_console_fini ();
}
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