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Pull request efi-2023-10-rc1

Browse source 
Documentation:
 
 * enhance UEFI anti-rollback documentation
 
 EFI:
 
 * Reconnect drivers if UninstallProtocol fails
 * Prefer short device paths for boot options
 * Fix error handling when updating boot options for block devices
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Merge tag 'efi-2023-10-rc1' of https://source.denx.de/u-boot/custodians/u-boot-efi

Pull request efi-2023-10-rc1

Documentation:

* enhance UEFI anti-rollback documentation

EFI:

* Reconnect drivers if UninstallProtocol fails
* Prefer short device paths for boot options
* Fix error handling when updating boot options for block devices
This commit is contained in:
Tom Rini 2023-07-15 11:19:11 -04:00
commit 3a7a17dbdc
10 changed files with 514 additions and 441 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

21
README
View file

@ -2430,27 +2430,6 @@ Hit 'q':
[q, b, e, ?] ## Application terminated, rc = 0x0
Minicom warning:
================
Over time, many people have reported problems when trying to use the
"minicom" terminal emulation program for serial download. I (wd)
consider minicom to be broken, and recommend not to use it. Under
Unix, I recommend to use C-Kermit for general purpose use (and
especially for kermit binary protocol download ("loadb" command), and
use "cu" for S-Record download ("loads" command). See
https://www.denx.de/wiki/view/DULG/SystemSetup#Section_4.3.
for help with kermit.
Nevertheless, if you absolutely want to use it try adding this
configuration to your "File transfer protocols" section:
Name Program Name U/D FullScr IO-Red. Multi
X kermit /usr/bin/kermit -i -l %l -s Y U Y N N
Y kermit /usr/bin/kermit -i -l %l -r N D Y N N
Implementation Internals:
=========================

4
cmd/bootmenu.c
View file

@ -351,8 +351,8 @@ static struct bootmenu_data *bootmenu_create(int delay)
* UEFI specification requires booting from removal media using
* a architecture-specific default image name such as BOOTAA64.EFI.
*/
efi_ret = eficonfig_generate_media_device_boot_option();
if (efi_ret != EFI_SUCCESS && efi_ret != EFI_NOT_FOUND)
efi_ret = efi_bootmgr_update_media_device_boot_option();
if (efi_ret != EFI_SUCCESS)
goto cleanup;
ret = prepare_uefi_bootorder_entry(menu, &iter, &i);

410
cmd/eficonfig.c
View file

@ -1134,43 +1134,6 @@ out:
return ret;
}
/**
* eficonfig_get_unused_bootoption() - get unused "Boot####" index
*
* @buf: pointer to the buffer to store boot option variable name
* @buf_size: buffer size
* @index: pointer to store the index in the BootOrder variable
* Return: status code
*/
efi_status_t eficonfig_get_unused_bootoption(u16 *buf, efi_uintn_t buf_size,
unsigned int *index)
{
u32 i;
efi_status_t ret;
efi_uintn_t size;
if (buf_size < u16_strsize(u"Boot####"))
return EFI_BUFFER_TOO_SMALL;
for (i = 0; i <= 0xFFFF; i++) {
size = 0;
efi_create_indexed_name(buf, buf_size, "Boot", i);
ret = efi_get_variable_int(buf, &efi_global_variable_guid,
NULL, &size, NULL, NULL);
if (ret == EFI_BUFFER_TOO_SMALL)
continue;
else
break;
}
if (i > 0xFFFF)
return EFI_OUT_OF_RESOURCES;
*index = i;
return EFI_SUCCESS;
}
/**
* eficonfig_set_boot_option() - set boot option
*
@ -1208,46 +1171,6 @@ static efi_status_t eficonfig_set_boot_option(u16 *varname, struct efi_device_pa
return ret;
}
/**
* eficonfig_append_bootorder() - append new boot option in BootOrder variable
*
* @index: "Boot####" index to append to BootOrder variable
* Return: status code
*/
efi_status_t eficonfig_append_bootorder(u16 index)
{
u16 *bootorder;
efi_status_t ret;
u16 *new_bootorder = NULL;
efi_uintn_t last, size, new_size;
/* append new boot option */
bootorder = efi_get_var(u"BootOrder", &efi_global_variable_guid, &size);
last = size / sizeof(u16);
new_size = size + sizeof(u16);
new_bootorder = calloc(1, new_size);
if (!new_bootorder) {
ret = EFI_OUT_OF_RESOURCES;
goto out;
}
memcpy(new_bootorder, bootorder, size);
new_bootorder[last] = index;
ret = efi_set_variable_int(u"BootOrder", &efi_global_variable_guid,
EFI_VARIABLE_NON_VOLATILE |
EFI_VARIABLE_BOOTSERVICE_ACCESS |
EFI_VARIABLE_RUNTIME_ACCESS,
new_size, new_bootorder, false);
if (ret != EFI_SUCCESS)
goto out;
out:
free(bootorder);
free(new_bootorder);
return ret;
}
/**
* create_boot_option_entry() - create boot option entry
*
@ -1619,7 +1542,7 @@ static efi_status_t eficonfig_process_add_boot_option(void *data)
if (!bo)
return EFI_OUT_OF_RESOURCES;
ret = eficonfig_get_unused_bootoption(varname, sizeof(varname), &bo->boot_index);
ret = efi_bootmgr_get_unused_bootoption(varname, sizeof(varname), &bo->boot_index);
if (ret != EFI_SUCCESS)
return ret;
@ -1627,7 +1550,7 @@ static efi_status_t eficonfig_process_add_boot_option(void *data)
if (ret != EFI_SUCCESS)
goto out;
ret = eficonfig_append_bootorder((u16)bo->boot_index);
ret = efi_bootmgr_append_bootorder((u16)bo->boot_index);
if (ret != EFI_SUCCESS)
goto out;
@ -1656,31 +1579,6 @@ static efi_status_t eficonfig_process_boot_selected(void *data)
return EFI_SUCCESS;
}
/**
* search_bootorder() - search the boot option index in BootOrder
*
* @bootorder: pointer to the BootOrder variable
* @num: number of BootOrder entry
* @target: target boot option index to search
* @index: pointer to store the index of BootOrder variable
* Return: true if exists, false otherwise
*/
static bool search_bootorder(u16 *bootorder, efi_uintn_t num, u32 target, u32 *index)
{
u32 i;
for (i = 0; i < num; i++) {
if (target == bootorder[i]) {
if (index)
*index = i;
return true;
}
}
return false;
}
/**
* eficonfig_add_boot_selection_entry() - add boot option menu entry
*
@ -1805,7 +1703,7 @@ static efi_status_t eficonfig_show_boot_selection(unsigned int *selected)
if (efi_varname_is_load_option(var_name16, &index)) {
/* If the index is included in the BootOrder, skip it */
if (search_bootorder(bootorder, num, index, NULL))
if (efi_search_bootorder(bootorder, num, index, NULL))
continue;
ret = eficonfig_add_boot_selection_entry(efi_menu, index, selected);
@ -2202,7 +2100,7 @@ static efi_status_t eficonfig_create_change_boot_order_entry(struct efimenu *efi
if (efi_varname_is_load_option(var_name16, &index)) {
/* If the index is included in the BootOrder, skip it */
if (search_bootorder(bootorder, num, index, NULL))
if (efi_search_bootorder(bootorder, num, index, NULL))
continue;
ret = eficonfig_add_change_boot_order_entry(efi_menu, index, false);
@ -2304,50 +2202,6 @@ out:
return ret;
}
/**
* delete_boot_option() - delete selected boot option
*
* @boot_index: boot option index to delete
* Return: status code
*/
static efi_status_t delete_boot_option(u16 boot_index)
{
u16 *bootorder;
u16 varname[9];
efi_status_t ret;
unsigned int index;
efi_uintn_t num, size;
efi_create_indexed_name(varname, sizeof(varname),
"Boot", boot_index);
ret = efi_set_variable_int(varname, &efi_global_variable_guid,
0, 0, NULL, false);
if (ret != EFI_SUCCESS) {
log_err("delete boot option(%ls) failed\n", varname);
return ret;
}
/* update BootOrder if necessary */
bootorder = efi_get_var(u"BootOrder", &efi_global_variable_guid, &size);
if (!bootorder)
return EFI_SUCCESS;
num = size / sizeof(u16);
if (!search_bootorder(bootorder, num, boot_index, &index))
return EFI_SUCCESS;
memmove(&bootorder[index], &bootorder[index + 1],
(num - index - 1) * sizeof(u16));
size -= sizeof(u16);
ret = efi_set_variable_int(u"BootOrder", &efi_global_variable_guid,
EFI_VARIABLE_NON_VOLATILE |
EFI_VARIABLE_BOOTSERVICE_ACCESS |
EFI_VARIABLE_RUNTIME_ACCESS,
size, bootorder, false);
return ret;
}
/**
* eficonfig_process_delete_boot_option() - handler to delete boot option
*
@ -2362,7 +2216,7 @@ static efi_status_t eficonfig_process_delete_boot_option(void *data)
while (1) {
ret = eficonfig_show_boot_selection(&selected);
if (ret == EFI_SUCCESS)
ret = delete_boot_option(selected);
ret = efi_bootmgr_delete_boot_option(selected);
if (ret != EFI_SUCCESS)
break;
@ -2374,256 +2228,6 @@ static efi_status_t eficonfig_process_delete_boot_option(void *data)
return ret;
}
/**
* eficonfig_enumerate_boot_option() - enumerate the possible bootable media
*
* @opt: pointer to the media boot option structure
* @volume_handles: pointer to the efi handles
* @count: number of efi handle
* Return: status code
*/
efi_status_t eficonfig_enumerate_boot_option(struct eficonfig_media_boot_option *opt,
efi_handle_t *volume_handles, efi_status_t count)
{
u32 i;
struct efi_handler *handler;
efi_status_t ret = EFI_SUCCESS;
for (i = 0; i < count; i++) {
u16 *p;
u16 dev_name[BOOTMENU_DEVICE_NAME_MAX];
char *optional_data;
struct efi_load_option lo;
char buf[BOOTMENU_DEVICE_NAME_MAX];
struct efi_device_path *device_path;
ret = efi_search_protocol(volume_handles[i], &efi_guid_device_path, &handler);
if (ret != EFI_SUCCESS)
continue;
ret = efi_protocol_open(handler, (void **)&device_path,
efi_root, NULL, EFI_OPEN_PROTOCOL_GET_PROTOCOL);
if (ret != EFI_SUCCESS)
continue;
ret = efi_disk_get_device_name(volume_handles[i], buf, BOOTMENU_DEVICE_NAME_MAX);
if (ret != EFI_SUCCESS)
continue;
p = dev_name;
utf8_utf16_strncpy(&p, buf, strlen(buf));
lo.label = dev_name;
lo.attributes = LOAD_OPTION_ACTIVE;
lo.file_path = device_path;
lo.file_path_length = efi_dp_size(device_path) + sizeof(END);
/*
* Set the dedicated guid to optional_data, it is used to identify
* the boot option that automatically generated by the bootmenu.
* efi_serialize_load_option() expects optional_data is null-terminated
* utf8 string, so set the "1234567" string to allocate enough space
* to store guid, instead of realloc the load_option.
*/
lo.optional_data = "1234567";
opt[i].size = efi_serialize_load_option(&lo, (u8 **)&opt[i].lo);
if (!opt[i].size) {
ret = EFI_OUT_OF_RESOURCES;
goto out;
}
/* set the guid */
optional_data = (char *)opt[i].lo + (opt[i].size - u16_strsize(u"1234567"));
memcpy(optional_data, &efi_guid_bootmenu_auto_generated, sizeof(efi_guid_t));
}
out:
return ret;
}
/**
* eficonfig_delete_invalid_boot_option() - delete non-existing boot option
*
* @opt: pointer to the media boot option structure
* @count: number of media boot option structure
* Return: status code
*/
efi_status_t eficonfig_delete_invalid_boot_option(struct eficonfig_media_boot_option *opt,
efi_status_t count)
{
efi_uintn_t size;
void *load_option;
u32 i, list_size = 0;
struct efi_load_option lo;
u16 *var_name16 = NULL;
u16 varname[] = u"Boot####";
efi_status_t ret = EFI_SUCCESS;
u16 *delete_index_list = NULL, *p;
efi_uintn_t buf_size;
buf_size = 128;
var_name16 = malloc(buf_size);
if (!var_name16)
return EFI_OUT_OF_RESOURCES;
var_name16[0] = 0;
for (;;) {
int index;
efi_guid_t guid;
efi_uintn_t tmp;
ret = efi_next_variable_name(&buf_size, &var_name16, &guid);
if (ret == EFI_NOT_FOUND) {
/*
* EFI_NOT_FOUND indicates we retrieved all EFI variables.
* This should be treated as success.
*/
ret = EFI_SUCCESS;
break;
}
if (ret != EFI_SUCCESS)
goto out;
if (!efi_varname_is_load_option(var_name16, &index))
continue;
efi_create_indexed_name(varname, sizeof(varname), "Boot", index);
load_option = efi_get_var(varname, &efi_global_variable_guid, &size);
if (!load_option)
continue;
tmp = size;
ret = efi_deserialize_load_option(&lo, load_option, &size);
if (ret != EFI_SUCCESS)
goto next;
if (size >= sizeof(efi_guid_bootmenu_auto_generated) &&
!guidcmp(lo.optional_data, &efi_guid_bootmenu_auto_generated)) {
for (i = 0; i < count; i++) {
if (opt[i].size == tmp &&
memcmp(opt[i].lo, load_option, tmp) == 0) {
opt[i].exist = true;
break;
}
}
/*
* The entire list of variables must be retrieved by
* efi_get_next_variable_name_int() before deleting the invalid
* boot option, just save the index here.
*/
if (i == count) {
p = realloc(delete_index_list, sizeof(u32) *
(list_size + 1));
if (!p) {
ret = EFI_OUT_OF_RESOURCES;
goto out;
}
delete_index_list = p;
delete_index_list[list_size++] = index;
}
}
next:
free(load_option);
}
/* delete all invalid boot options */
for (i = 0; i < list_size; i++) {
ret = delete_boot_option(delete_index_list[i]);
if (ret != EFI_SUCCESS)
goto out;
}
out:
free(var_name16);
free(delete_index_list);
return ret;
}
/**
* eficonfig_generate_media_device_boot_option() - generate the media device boot option
*
* This function enumerates all devices supporting EFI_SIMPLE_FILE_SYSTEM_PROTOCOL
* and generate the bootmenu entries.
* This function also provide the BOOT#### variable maintenance for
* the media device entries.
* - Automatically create the BOOT#### variable for the newly detected device,
* this BOOT#### variable is distinguished by the special GUID
* stored in the EFI_LOAD_OPTION.optional_data
* - If the device is not attached to the system, the associated BOOT#### variable
* is automatically deleted.
*
* Return: status code
*/
efi_status_t eficonfig_generate_media_device_boot_option(void)
{
u32 i;
efi_status_t ret;
efi_uintn_t count;
efi_handle_t *volume_handles = NULL;
struct eficonfig_media_boot_option *opt = NULL;
ret = efi_locate_handle_buffer_int(BY_PROTOCOL, &efi_simple_file_system_protocol_guid,
NULL, &count, (efi_handle_t **)&volume_handles);
if (ret != EFI_SUCCESS)
return ret;
opt = calloc(count, sizeof(struct eficonfig_media_boot_option));
if (!opt)
goto out;
/* enumerate all devices supporting EFI_SIMPLE_FILE_SYSTEM_PROTOCOL */
ret = eficonfig_enumerate_boot_option(opt, volume_handles, count);
if (ret != EFI_SUCCESS)
goto out;
/*
* System hardware configuration may vary depending on the user setup.
* The boot option is automatically added by the bootmenu.
* If the device is not attached to the system, the boot option needs
* to be deleted.
*/
ret = eficonfig_delete_invalid_boot_option(opt, count);
if (ret != EFI_SUCCESS)
goto out;
/* add non-existent boot option */
for (i = 0; i < count; i++) {
u32 boot_index;
u16 var_name[9];
if (!opt[i].exist) {
ret = eficonfig_get_unused_bootoption(var_name, sizeof(var_name),
&boot_index);
if (ret != EFI_SUCCESS)
goto out;
ret = efi_set_variable_int(var_name, &efi_global_variable_guid,
EFI_VARIABLE_NON_VOLATILE |
EFI_VARIABLE_BOOTSERVICE_ACCESS |
EFI_VARIABLE_RUNTIME_ACCESS,
opt[i].size, opt[i].lo, false);
if (ret != EFI_SUCCESS)
goto out;
ret = eficonfig_append_bootorder(boot_index);
if (ret != EFI_SUCCESS) {
efi_set_variable_int(var_name, &efi_global_variable_guid,
0, 0, NULL, false);
goto out;
}
}
}
out:
if (opt) {
for (i = 0; i < count; i++)
free(opt[i].lo);
}
free(opt);
efi_free_pool(volume_handles);
return ret;
}
/**
* eficonfig_init() - do required initialization for eficonfig command
*
@ -2709,8 +2313,8 @@ static int do_eficonfig(struct cmd_tbl *cmdtp, int flag, int argc, char *const a
if (ret != EFI_SUCCESS)
return CMD_RET_FAILURE;
ret = eficonfig_generate_media_device_boot_option();
if (ret != EFI_SUCCESS && ret != EFI_NOT_FOUND)
ret = efi_bootmgr_update_media_device_boot_option();
if (ret != EFI_SUCCESS)
return ret;
while (1) {

7
doc/develop/uefi/uefi.rst
View file

@ -552,6 +552,13 @@ update using a capsule file with --fw-version of 5, the update will fail.
When the --fw-version in the capsule file is updated, lowest-supported-version
in the dtb might be updated accordingly.
If user needs to enforce anti-rollback to any older version,
the lowest-supported-version property in dtb must be always updated manually.
Note that the lowest-supported-version property specified in U-Boot's control
device tree can be changed by U-Boot fdt command.
Secure systems should not enable this command.
To insert the lowest supported version into a dtb
.. code-block:: console

5
include/efi_config.h
View file

@ -105,11 +105,6 @@ efi_status_t eficonfig_process_common(struct efimenu *efi_menu,
void (*item_data_print)(void *),
char *(*item_choice)(void *));
efi_status_t eficonfig_process_select_file(void *data);
efi_status_t eficonfig_get_unused_bootoption(u16 *buf,
efi_uintn_t buf_size, u32 *index);
efi_status_t eficonfig_append_bootorder(u16 index);
efi_status_t eficonfig_generate_media_device_boot_option(void);
efi_status_t eficonfig_append_menu_entry(struct efimenu *efi_menu,
char *title, eficonfig_entry_func func,
void *data);

11
include/efi_loader.h
View file

@ -517,6 +517,17 @@ struct efi_register_notify_event {
int efi_init_early(void);
/* Initialize efi execution environment */
efi_status_t efi_init_obj_list(void);
/* Append new boot option in BootOrder variable */
efi_status_t efi_bootmgr_append_bootorder(u16 index);
/* Get unused "Boot####" index */
efi_status_t efi_bootmgr_get_unused_bootoption(u16 *buf,
efi_uintn_t buf_size, u32 *index);
/* Generate the media device boot option */
efi_status_t efi_bootmgr_update_media_device_boot_option(void);
/* Delete selected boot option */
efi_status_t efi_bootmgr_delete_boot_option(u16 boot_index);
/* search the boot option index in BootOrder */
bool efi_search_bootorder(u16 *bootorder, efi_uintn_t num, u32 target, u32 *index);
/* Set up console modes */
void efi_setup_console_size(void);
/* Install device tree */

385
lib/efi_loader/efi_bootmgr.c
View file

@ -344,3 +344,388 @@ efi_status_t efi_bootmgr_load(efi_handle_t *handle, void **load_options)
error:
return ret;
}
/**
* efi_bootmgr_enumerate_boot_option() - enumerate the possible bootable media
*
* @opt: pointer to the media boot option structure
* @volume_handles: pointer to the efi handles
* @count: number of efi handle
* Return: status code
*/
static efi_status_t efi_bootmgr_enumerate_boot_option(struct eficonfig_media_boot_option *opt,
efi_handle_t *volume_handles,
efi_status_t count)
{
u32 i;
struct efi_handler *handler;
efi_status_t ret = EFI_SUCCESS;
for (i = 0; i < count; i++) {
u16 *p;
u16 dev_name[BOOTMENU_DEVICE_NAME_MAX];
char *optional_data;
struct efi_load_option lo;
char buf[BOOTMENU_DEVICE_NAME_MAX];
struct efi_device_path *device_path;
struct efi_device_path *short_dp;
ret = efi_search_protocol(volume_handles[i], &efi_guid_device_path, &handler);
if (ret != EFI_SUCCESS)
continue;
ret = efi_protocol_open(handler, (void **)&device_path,
efi_root, NULL, EFI_OPEN_PROTOCOL_GET_PROTOCOL);
if (ret != EFI_SUCCESS)
continue;
ret = efi_disk_get_device_name(volume_handles[i], buf, BOOTMENU_DEVICE_NAME_MAX);
if (ret != EFI_SUCCESS)
continue;
p = dev_name;
utf8_utf16_strncpy(&p, buf, strlen(buf));
/* prefer to short form device path */
short_dp = efi_dp_shorten(device_path);
if (short_dp)
device_path = short_dp;
lo.label = dev_name;
lo.attributes = LOAD_OPTION_ACTIVE;
lo.file_path = device_path;
lo.file_path_length = efi_dp_size(device_path) + sizeof(END);
/*
* Set the dedicated guid to optional_data, it is used to identify
* the boot option that automatically generated by the bootmenu.
* efi_serialize_load_option() expects optional_data is null-terminated
* utf8 string, so set the "1234567" string to allocate enough space
* to store guid, instead of realloc the load_option.
*/
lo.optional_data = "1234567";
opt[i].size = efi_serialize_load_option(&lo, (u8 **)&opt[i].lo);
if (!opt[i].size) {
ret = EFI_OUT_OF_RESOURCES;
goto out;
}
/* set the guid */
optional_data = (char *)opt[i].lo + (opt[i].size - u16_strsize(u"1234567"));
memcpy(optional_data, &efi_guid_bootmenu_auto_generated, sizeof(efi_guid_t));
}
out:
return ret;
}
/**
* efi_bootmgr_delete_invalid_boot_option() - delete non-existing boot option
*
* @opt: pointer to the media boot option structure
* @count: number of media boot option structure
* Return: status code
*/
static efi_status_t efi_bootmgr_delete_invalid_boot_option(struct eficonfig_media_boot_option *opt,
efi_status_t count)
{
efi_uintn_t size;
void *load_option;
u32 i, list_size = 0;
struct efi_load_option lo;
u16 *var_name16 = NULL;
u16 varname[] = u"Boot####";
efi_status_t ret = EFI_SUCCESS;
u16 *delete_index_list = NULL, *p;
efi_uintn_t buf_size;
buf_size = 128;
var_name16 = malloc(buf_size);
if (!var_name16)
return EFI_OUT_OF_RESOURCES;
var_name16[0] = 0;
for (;;) {
int index;
efi_guid_t guid;
efi_uintn_t tmp;
ret = efi_next_variable_name(&buf_size, &var_name16, &guid);
if (ret == EFI_NOT_FOUND) {
/*
* EFI_NOT_FOUND indicates we retrieved all EFI variables.
* This should be treated as success.
*/
ret = EFI_SUCCESS;
break;
}
if (ret != EFI_SUCCESS)
goto out;
if (!efi_varname_is_load_option(var_name16, &index))
continue;
efi_create_indexed_name(varname, sizeof(varname), "Boot", index);
load_option = efi_get_var(varname, &efi_global_variable_guid, &size);
if (!load_option)
continue;
tmp = size;
ret = efi_deserialize_load_option(&lo, load_option, &size);
if (ret != EFI_SUCCESS)
goto next;
if (size >= sizeof(efi_guid_bootmenu_auto_generated) &&
!guidcmp(lo.optional_data, &efi_guid_bootmenu_auto_generated)) {
for (i = 0; i < count; i++) {
if (opt[i].size == tmp &&
memcmp(opt[i].lo, load_option, tmp) == 0) {
opt[i].exist = true;
break;
}
}
/*
* The entire list of variables must be retrieved by
* efi_get_next_variable_name_int() before deleting the invalid
* boot option, just save the index here.
*/
if (i == count) {
p = realloc(delete_index_list, sizeof(u32) *
(list_size + 1));
if (!p) {
ret = EFI_OUT_OF_RESOURCES;
goto out;
}
delete_index_list = p;
delete_index_list[list_size++] = index;
}
}
next:
free(load_option);
}
/* delete all invalid boot options */
for (i = 0; i < list_size; i++) {
ret = efi_bootmgr_delete_boot_option(delete_index_list[i]);
if (ret != EFI_SUCCESS)
goto out;
}
out:
free(var_name16);
free(delete_index_list);
return ret;
}
/**
* efi_bootmgr_get_unused_bootoption() - get unused "Boot####" index
*
* @buf: pointer to the buffer to store boot option variable name
* @buf_size: buffer size
* @index: pointer to store the index in the BootOrder variable
* Return: status code
*/
efi_status_t efi_bootmgr_get_unused_bootoption(u16 *buf, efi_uintn_t buf_size,
unsigned int *index)
{
u32 i;
efi_status_t ret;
efi_uintn_t size;
if (buf_size < u16_strsize(u"Boot####"))
return EFI_BUFFER_TOO_SMALL;
for (i = 0; i <= 0xFFFF; i++) {
size = 0;
efi_create_indexed_name(buf, buf_size, "Boot", i);
ret = efi_get_variable_int(buf, &efi_global_variable_guid,
NULL, &size, NULL, NULL);
if (ret == EFI_BUFFER_TOO_SMALL)
continue;
else
break;
}
if (i > 0xFFFF)
return EFI_OUT_OF_RESOURCES;
*index = i;
return EFI_SUCCESS;
}
/**
* efi_bootmgr_append_bootorder() - append new boot option in BootOrder variable
*
* @index: "Boot####" index to append to BootOrder variable
* Return: status code
*/
efi_status_t efi_bootmgr_append_bootorder(u16 index)
{
u16 *bootorder;
efi_status_t ret;
u16 *new_bootorder = NULL;
efi_uintn_t last, size, new_size;
/* append new boot option */
bootorder = efi_get_var(u"BootOrder", &efi_global_variable_guid, &size);
last = size / sizeof(u16);
new_size = size + sizeof(u16);
new_bootorder = calloc(1, new_size);
if (!new_bootorder) {
ret = EFI_OUT_OF_RESOURCES;
goto out;
}
memcpy(new_bootorder, bootorder, size);
new_bootorder[last] = index;
ret = efi_set_variable_int(u"BootOrder", &efi_global_variable_guid,
EFI_VARIABLE_NON_VOLATILE |
EFI_VARIABLE_BOOTSERVICE_ACCESS |
EFI_VARIABLE_RUNTIME_ACCESS,
new_size, new_bootorder, false);
if (ret != EFI_SUCCESS)
goto out;
out:
free(bootorder);
free(new_bootorder);
return ret;
}
/**
* efi_bootmgr_delete_boot_option() - delete selected boot option
*
* @boot_index: boot option index to delete
* Return: status code
*/
efi_status_t efi_bootmgr_delete_boot_option(u16 boot_index)
{
u16 *bootorder;
u16 varname[9];
efi_status_t ret;
unsigned int index;
efi_uintn_t num, size;
efi_create_indexed_name(varname, sizeof(varname),
"Boot", boot_index);
ret = efi_set_variable_int(varname, &efi_global_variable_guid,
0, 0, NULL, false);
if (ret != EFI_SUCCESS) {
log_err("delete boot option(%ls) failed\n", varname);
return ret;
}
/* update BootOrder if necessary */
bootorder = efi_get_var(u"BootOrder", &efi_global_variable_guid, &size);
if (!bootorder)
return EFI_SUCCESS;
num = size / sizeof(u16);
if (!efi_search_bootorder(bootorder, num, boot_index, &index))
return EFI_SUCCESS;
memmove(&bootorder[index], &bootorder[index + 1],
(num - index - 1) * sizeof(u16));
size -= sizeof(u16);
ret = efi_set_variable_int(u"BootOrder", &efi_global_variable_guid,
EFI_VARIABLE_NON_VOLATILE |
EFI_VARIABLE_BOOTSERVICE_ACCESS |
EFI_VARIABLE_RUNTIME_ACCESS,
size, bootorder, false);
return ret;
}
/**
* efi_bootmgr_update_media_device_boot_option() - generate the media device boot option
*
* This function enumerates all devices supporting EFI_SIMPLE_FILE_SYSTEM_PROTOCOL
* and generate the bootmenu entries.
* This function also provide the BOOT#### variable maintenance for
* the media device entries.
* - Automatically create the BOOT#### variable for the newly detected device,
* this BOOT#### variable is distinguished by the special GUID
* stored in the EFI_LOAD_OPTION.optional_data
* - If the device is not attached to the system, the associated BOOT#### variable
* is automatically deleted.
*
* Return: status code
*/
efi_status_t efi_bootmgr_update_media_device_boot_option(void)
{
u32 i;
efi_status_t ret;
efi_uintn_t count;
efi_handle_t *volume_handles = NULL;
struct eficonfig_media_boot_option *opt = NULL;
ret = efi_locate_handle_buffer_int(BY_PROTOCOL,
&efi_simple_file_system_protocol_guid,
NULL, &count,
(efi_handle_t **)&volume_handles);
if (ret != EFI_SUCCESS)
goto out;
opt = calloc(count, sizeof(struct eficonfig_media_boot_option));
if (!opt) {
ret = EFI_OUT_OF_RESOURCES;
goto out;
}
/* enumerate all devices supporting EFI_SIMPLE_FILE_SYSTEM_PROTOCOL */
ret = efi_bootmgr_enumerate_boot_option(opt, volume_handles, count);
if (ret != EFI_SUCCESS)
goto out;
/*
* System hardware configuration may vary depending on the user setup.
* The boot option is automatically added by the bootmenu.
* If the device is not attached to the system, the boot option needs
* to be deleted.
*/
ret = efi_bootmgr_delete_invalid_boot_option(opt, count);
if (ret != EFI_SUCCESS)
goto out;
/* add non-existent boot option */
for (i = 0; i < count; i++) {
u32 boot_index;
u16 var_name[9];
if (!opt[i].exist) {
ret = efi_bootmgr_get_unused_bootoption(var_name, sizeof(var_name),
&boot_index);
if (ret != EFI_SUCCESS)
goto out;
ret = efi_set_variable_int(var_name, &efi_global_variable_guid,
EFI_VARIABLE_NON_VOLATILE |
EFI_VARIABLE_BOOTSERVICE_ACCESS |
EFI_VARIABLE_RUNTIME_ACCESS,
opt[i].size, opt[i].lo, false);
if (ret != EFI_SUCCESS)
goto out;
ret = efi_bootmgr_append_bootorder(boot_index);
if (ret != EFI_SUCCESS) {
efi_set_variable_int(var_name, &efi_global_variable_guid,
0, 0, NULL, false);
goto out;
}
}
}
out:
if (opt) {
for (i = 0; i < count; i++)
free(opt[i].lo);
}
free(opt);
efi_free_pool(volume_handles);
if (ret == EFI_NOT_FOUND)
return EFI_SUCCESS;
return ret;
}

43
lib/efi_loader/efi_boottime.c
View file

@ -97,6 +97,12 @@ static efi_status_t EFIAPI efi_disconnect_controller(
efi_handle_t driver_image_handle,
efi_handle_t child_handle);
static
efi_status_t EFIAPI efi_connect_controller(efi_handle_t controller_handle,
efi_handle_t *driver_image_handle,
struct efi_device_path *remain_device_path,
bool recursive);
/* Called on every callback entry */
int __efi_entry_check(void)
{
@ -1298,7 +1304,7 @@ static efi_status_t efi_disconnect_all_drivers
const efi_guid_t *protocol,
efi_handle_t child_handle)
{
efi_uintn_t number_of_drivers;
efi_uintn_t number_of_drivers, tmp;
efi_handle_t *driver_handle_buffer;
efi_status_t r, ret;
@ -1308,15 +1314,30 @@ static efi_status_t efi_disconnect_all_drivers
return ret;
if (!number_of_drivers)
return EFI_SUCCESS;
ret = EFI_NOT_FOUND;
tmp = number_of_drivers;
while (number_of_drivers) {
r = EFI_CALL(efi_disconnect_controller(
ret = EFI_CALL(efi_disconnect_controller(
handle,
driver_handle_buffer[--number_of_drivers],
child_handle));
if (r == EFI_SUCCESS)
ret = r;
if (ret != EFI_SUCCESS)
goto reconnect;
}
free(driver_handle_buffer);
return ret;
reconnect:
/* Reconnect all disconnected drivers */
for (; number_of_drivers < tmp; number_of_drivers++) {
r = EFI_CALL(efi_connect_controller(handle,
&driver_handle_buffer[number_of_drivers],
NULL, true));
if (r != EFI_SUCCESS)
EFI_PRINT("Failed to reconnect controller\n");
}
free(driver_handle_buffer);
return ret;
}
@ -1352,18 +1373,26 @@ static efi_status_t efi_uninstall_protocol
r = efi_search_protocol(handle, protocol, &handler);
if (r != EFI_SUCCESS)
goto out;
if (handler->protocol_interface != protocol_interface)
return EFI_NOT_FOUND;
/* Disconnect controllers */
efi_disconnect_all_drivers(efiobj, protocol, NULL);
r = efi_disconnect_all_drivers(efiobj, protocol, NULL);
if (r != EFI_SUCCESS) {
r = EFI_ACCESS_DENIED;
goto out;
}
/* Close protocol */
list_for_each_entry_safe(item, pos, &handler->open_infos, link) {
if (item->info.attributes ==
EFI_OPEN_PROTOCOL_BY_HANDLE_PROTOCOL ||
item->info.attributes == EFI_OPEN_PROTOCOL_GET_PROTOCOL ||
item->info.attributes == EFI_OPEN_PROTOCOL_TEST_PROTOCOL)
list_del(&item->link);
efi_delete_open_info(item);
}
/* if agents didn't close the protocols properly */
if (!list_empty(&handler->open_infos)) {
r = EFI_ACCESS_DENIED;
EFI_CALL(efi_connect_controller(handle, NULL, NULL, true));
goto out;
}
r = efi_remove_protocol(handle, protocol, protocol_interface);

25
lib/efi_loader/efi_helper.c
View file

@ -257,3 +257,28 @@ efi_status_t efi_next_variable_name(efi_uintn_t *size, u16 **buf, efi_guid_t *gu
return ret;
}
/**
* efi_search_bootorder() - search the boot option index in BootOrder
*
* @bootorder: pointer to the BootOrder variable
* @num: number of BootOrder entry
* @target: target boot option index to search
* @index: pointer to store the index of BootOrder variable
* Return: true if exists, false otherwise
*/
bool efi_search_bootorder(u16 *bootorder, efi_uintn_t num, u32 target, u32 *index)
{
u32 i;
for (i = 0; i < num; i++) {
if (target == bootorder[i]) {
if (index)
*index = i;
return true;
}
}
return false;
}

44
lib/efi_selftest/efi_selftest_controllers.c
View file

@ -28,6 +28,7 @@ static efi_guid_t guid_child_controller =
static efi_handle_t handle_controller;
static efi_handle_t handle_child_controller[NUMBER_OF_CHILD_CONTROLLERS];
static efi_handle_t handle_driver;
static bool allow_removal;
/*
* Count child controllers
@ -85,8 +86,8 @@ static efi_status_t EFIAPI supported(
controller_handle, EFI_OPEN_PROTOCOL_BY_DRIVER);
switch (ret) {
case EFI_ACCESS_DENIED:
case EFI_ALREADY_STARTED:
return ret;
case EFI_ALREADY_STARTED:
case EFI_SUCCESS:
break;
default:
@ -124,8 +125,8 @@ static efi_status_t EFIAPI start(
controller_handle, EFI_OPEN_PROTOCOL_BY_DRIVER);
switch (ret) {
case EFI_ACCESS_DENIED:
case EFI_ALREADY_STARTED:
return ret;
case EFI_ALREADY_STARTED:
case EFI_SUCCESS:
break;
default:
@ -238,6 +239,9 @@ static efi_status_t EFIAPI stop(
if (ret != EFI_SUCCESS)
efi_st_error("Cannot free buffer\n");
if (!allow_removal)
return EFI_DEVICE_ERROR;
/* Detach driver from controller */
ret = boottime->close_protocol(
controller_handle, &guid_controller,
@ -342,6 +346,7 @@ static int execute(void)
return EFI_ST_FAILURE;
}
/* Destroy remaining child controllers and disconnect controller */
allow_removal = true;
ret = boottime->disconnect_controller(handle_controller, NULL, NULL);
if (ret != EFI_SUCCESS) {
efi_st_error("Failed to disconnect controller\n");
@ -393,7 +398,40 @@ static int execute(void)
efi_st_error("Number of children %u != %u\n",
(unsigned int)count, NUMBER_OF_CHILD_CONTROLLERS);
}
/* Uninstall controller protocol */
allow_removal = false;
/* Try to uninstall controller protocol using the wrong interface */
ret = boottime->uninstall_protocol_interface(handle_controller,
&guid_controller,
&interface1);
if (ret != EFI_NOT_FOUND) {
efi_st_error("Interface not checked when uninstalling protocol\n");
return EFI_ST_FAILURE;
}
/*
* Uninstall a protocol while Disconnect controller won't
* allow it.
*/
ret = boottime->uninstall_protocol_interface(handle_controller,
&guid_controller,
&interface2);
if (ret != EFI_ACCESS_DENIED) {
efi_st_error("Uninstall protocol interface failed\n");
return EFI_ST_FAILURE;
}
/*
* Check number of child controllers and make sure children have
* been reconnected
*/
ret = count_child_controllers(handle_controller, &guid_controller,
&count);
if (ret != EFI_SUCCESS || count != NUMBER_OF_CHILD_CONTROLLERS) {
efi_st_error("Number of children %u != %u\n",
(unsigned int)count, NUMBER_OF_CHILD_CONTROLLERS);
}
allow_removal = true;
ret = boottime->uninstall_protocol_interface(handle_controller,
&guid_controller,
&interface2);