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efi_loader: set load options in boot manager

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Up to now we used the value of the bootargs environment variable as load
options in the boot manager. This is not correct. The data has to be taken
from the Boot#### variable.

Let the boot manager copy the optional data of the EFI_LOAD_OPTION as load
options to the loaded image protocol.

Signed-off-by: Heinrich Schuchardt <xypron.glpk@gmx.de>
This commit is contained in:
Heinrich Schuchardt 2020-08-07 17:49:39 +02:00
parent 1064d04920
commit 0ad64007fe
4 changed files with 43 additions and 23 deletions
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22
cmd/bootefi.c
View File

@ -310,17 +310,11 @@ efi_status_t efi_install_fdt(void *fdt)
* Load the EFI binary into a newly assigned memory unwinding the relocation
* information, install the loaded image protocol, and call the binary.
*/
static efi_status_t do_bootefi_exec(efi_handle_t handle)
static efi_status_t do_bootefi_exec(efi_handle_t handle, void *load_options)
{
efi_status_t ret;
efi_uintn_t exit_data_size = 0;
u16 *exit_data = NULL;
u16 *load_options;
/* Transfer environment variable as load options */
ret = efi_env_set_load_options(handle, "bootargs", &load_options);
if (ret != EFI_SUCCESS)
return ret;
/* Call our payload! */
ret = EFI_CALL(efi_start_image(handle, &exit_data_size, &exit_data));
@ -349,14 +343,15 @@ static int do_efibootmgr(void)
{
efi_handle_t handle;
efi_status_t ret;
void *load_options;
ret = efi_bootmgr_load(&handle);
ret = efi_bootmgr_load(&handle, &load_options);
if (ret != EFI_SUCCESS) {
log_notice("EFI boot manager: Cannot load any image\n");
return CMD_RET_FAILURE;
}
ret = do_bootefi_exec(handle);
ret = do_bootefi_exec(handle, load_options);
if (ret != EFI_SUCCESS)
return CMD_RET_FAILURE;
@ -467,7 +462,14 @@ efi_status_t efi_run_image(void *source_buffer, efi_uintn_t source_size)
if (ret != EFI_SUCCESS)
goto out;
ret = do_bootefi_exec(handle);
u16 *load_options;
/* Transfer environment variable as load options */
ret = efi_env_set_load_options(handle, "bootargs", &load_options);
if (ret != EFI_SUCCESS)
goto out;
ret = do_bootefi_exec(handle, load_options);
out:
efi_delete_handle(mem_handle);

4
cmd/efidebug.c
View File

@ -1126,8 +1126,9 @@ static int do_efi_test_bootmgr(struct cmd_tbl *cmdtp, int flag,
efi_uintn_t exit_data_size = 0;
u16 *exit_data = NULL;
efi_status_t ret;
void *load_options;
ret = efi_bootmgr_load(&image);
ret = efi_bootmgr_load(&image, &load_options);
printf("efi_bootmgr_load() returned: %ld\n", ret & ~EFI_ERROR_MASK);
/* We call efi_start_image() even if error for test purpose. */
@ -1138,6 +1139,7 @@ static int do_efi_test_bootmgr(struct cmd_tbl *cmdtp, int flag,
efi_restore_gd();
free(load_options);
return CMD_RET_SUCCESS;
}

2
include/efi_loader.h
View File

@ -720,7 +720,7 @@ unsigned long efi_serialize_load_option(struct efi_load_option *lo, u8 **data);
efi_status_t efi_set_load_options(efi_handle_t handle,
efi_uintn_t load_options_size,
void *load_options);
efi_status_t efi_bootmgr_load(efi_handle_t *handle);
efi_status_t efi_bootmgr_load(efi_handle_t *handle, void **load_options);
/**
* efi_image_regions - A list of memory regions

38
lib/efi_loader/efi_bootmgr.c
View File

@ -206,11 +206,13 @@ static void *get_var(u16 *name, const efi_guid_t *vendor,
* if successful. This checks that the EFI_LOAD_OPTION is active (enabled)
* and that the specified file to boot exists.
*
* @n: number of the boot option, e.g. 0x0a13 for Boot0A13
* @handle: on return handle for the newly installed image
* Return: status code
* @n: number of the boot option, e.g. 0x0a13 for Boot0A13
* @handle: on return handle for the newly installed image
* @load_options: load options set on the loaded image protocol
* Return: status code
*/
static efi_status_t try_load_entry(u16 n, efi_handle_t *handle)
static efi_status_t try_load_entry(u16 n, efi_handle_t *handle,
void **load_options)
{
struct efi_load_option lo;
u16 varname[] = L"Boot0000";
@ -250,10 +252,9 @@ static efi_status_t try_load_entry(u16 n, efi_handle_t *handle)
attributes = EFI_VARIABLE_BOOTSERVICE_ACCESS |
EFI_VARIABLE_RUNTIME_ACCESS;
size = sizeof(n);
ret = efi_set_variable_int(L"BootCurrent",
&efi_global_variable_guid,
attributes, size, &n, false);
attributes, sizeof(n), &n, false);
if (ret != EFI_SUCCESS) {
if (EFI_CALL(efi_unload_image(*handle))
!= EFI_SUCCESS)
@ -266,6 +267,19 @@ static efi_status_t try_load_entry(u16 n, efi_handle_t *handle)
ret = EFI_LOAD_ERROR;
}
/* Set load options */
if (size) {
*load_options = malloc(size);
if (!*load_options) {
ret = EFI_OUT_OF_RESOURCES;
goto error;
}
memcpy(*load_options, lo.optional_data, size);
ret = efi_set_load_options(*handle, size, *load_options);
} else {
load_options = NULL;
}
error:
free(load_option);
@ -279,10 +293,11 @@ error:
* EFI variable, the available load-options, finding and returning
* the first one that can be loaded successfully.
*
* @handle: on return handle for the newly installed image
* Return: status code
* @handle: on return handle for the newly installed image
* @load_options: load options set on the loaded image protocol
* Return: status code
*/
efi_status_t efi_bootmgr_load(efi_handle_t *handle)
efi_status_t efi_bootmgr_load(efi_handle_t *handle, void **load_options)
{
u16 bootnext, *bootorder;
efi_uintn_t size;
@ -310,7 +325,8 @@ efi_status_t efi_bootmgr_load(efi_handle_t *handle)
/* load BootNext */
if (ret == EFI_SUCCESS) {
if (size == sizeof(u16)) {
ret = try_load_entry(bootnext, handle);
ret = try_load_entry(bootnext, handle,
load_options);
if (ret == EFI_SUCCESS)
return ret;
log_warning(
@ -333,7 +349,7 @@ efi_status_t efi_bootmgr_load(efi_handle_t *handle)
for (i = 0; i < num; i++) {
log_debug("%s trying to load Boot%04X\n", __func__,
bootorder[i]);
ret = try_load_entry(bootorder[i], handle);
ret = try_load_entry(bootorder[i], handle, load_options);
if (ret == EFI_SUCCESS)
break;
}