[PATCH v2 1/2] Boot var automatic management for removable medias
AKASHI Takahiro
takahiro.akashi at linaro.org
Thu Apr 13 10:19:48 CEST 2023
On Fri, Apr 07, 2023 at 12:13:36PM +0200, Heinrich Schuchardt wrote:
> On 4/5/23 02:06, Raymond Mao wrote:
> > Changes for complying to EFI spec §3.5.1.1
> > 'Removable Media Boot Behavior'.
> > Boot variables can be automatically generated during a removable
> > media is probed. At the same time, unused boot variables will be
> > detected and removed.
> > Related APIs are renamed and moved from cmd to lib for re-use
> > between eficonfig and bootmgr.
> >
> > Signed-off-by: Raymond Mao <raymond.mao at linaro.org>
>
> We should split the patch into moving and renaming functions and
> individual patches for each changed functionality.
>
> > ---
> > Changes in v2
> > - Ignore EFI_NOT_FOUND returned from
> > efi_bootmgr_update_media_device_boot_option which means no boot
> > options scanned.
> >
> > cmd/bootmenu.c | 2 +-
> > cmd/eficonfig.c | 408 +-----------------------------
> > include/efi_config.h | 5 -
> > include/efi_loader.h | 11 +
> > lib/efi_loader/efi_bootmgr.c | 380 ++++++++++++++++++++++++++++
> > lib/efi_loader/efi_disk.c | 7 +
> > lib/efi_loader/efi_helper.c | 25 ++
> > lib/efi_loader/efi_variable.c | 6 +-
> > lib/efi_loader/efi_variable_tee.c | 3 +-
> > 9 files changed, 437 insertions(+), 410 deletions(-)
> >
> > diff --git a/cmd/bootmenu.c b/cmd/bootmenu.c
> > index 6baeedc69f..01daddca7b 100644
> > --- a/cmd/bootmenu.c
> > +++ b/cmd/bootmenu.c
> > @@ -351,7 +351,7 @@ 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();
> > + efi_ret = efi_bootmgr_update_media_device_boot_option();
> > if (efi_ret != EFI_SUCCESS && efi_ret != EFI_NOT_FOUND)
> > goto cleanup;
> >
> > diff --git a/cmd/eficonfig.c b/cmd/eficonfig.c
> > index 720f52b48b..82a80306f4 100644
> > --- a/cmd/eficonfig.c
> > +++ b/cmd/eficonfig.c
> > @@ -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);
>
> Please, pass the number in the Boot#### variable and not an index in
> BootOrder.
>
> >
> > 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
> > *
> > @@ -2709,7 +2313,7 @@ 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();
> > + ret = efi_bootmgr_update_media_device_boot_option();
> > if (ret != EFI_SUCCESS && ret != EFI_NOT_FOUND)
> > return ret;
> >
> > diff --git a/include/efi_config.h b/include/efi_config.h
> > index 01ce9b2b06..d7c1601137 100644
> > --- a/include/efi_config.h
> > +++ b/include/efi_config.h
> > @@ -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);
> > diff --git a/include/efi_loader.h b/include/efi_loader.h
> > index 1542b4b625..31ca1f5d1d 100644
> > --- a/include/efi_loader.h
> > +++ b/include/efi_loader.h
> > @@ -516,6 +516,17 @@ extern struct list_head efi_register_notify_events;
> > 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 */
> > diff --git a/lib/efi_loader/efi_bootmgr.c b/lib/efi_loader/efi_bootmgr.c
> > index 4b24b41047..c329428973 100644
> > --- a/lib/efi_loader/efi_bootmgr.c
> > +++ b/lib/efi_loader/efi_bootmgr.c
> > @@ -347,3 +347,383 @@ 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;
> > +
> > + 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;
> > +}
> > +
> > +/**
> > + * efi_bootmgr_delete_invalid_boot_option() - delete non-existing boot option
>
> You can't delete what does not exist.
>
> > + *
> > + * @opt: pointer to the media boot option structure
> > + * @count: number of media boot option structure
>
> Why would you need such a parameter?
>
> > + * Return: status code
> > + */
> > +static efi_status_t efi_bootmgr_delete_invalid_boot_option(struct eficonfig_media_boot_option *opt,
> > + efi_status_t count)
>
> Why don't you pass in the boot option num
>
> > +{
> > + 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####";
>
> Why would you initialize the variable?
>
> > + 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);
>
> Can't we simply put the boot option number into struct
> eficonfig_media_boot_option and save 100 lines code?
>
> > + if (ret == EFI_NOT_FOUND) {
> > + log_debug("last efi var\n");
> > + /*
> > + * 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) {
> > + log_debug("found index %d can be deleted\n", index);
> > + 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++) {
> > + log_debug("deleting index %d\n", delete_index_list[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)
>
> This function should be static. The exported functions should not take
> the inddex in the BootOrder variable as a parameter.
>
> > +{
> > + 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)
> > + 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 = 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++) {
> > + if (opt[i].lo)
> > + free(opt[i].lo);
> > + }
> > + free(opt);
> > + }
> > + efi_free_pool(volume_handles);
> > +
> > + return ret;
> > +}
> > diff --git a/lib/efi_loader/efi_disk.c b/lib/efi_loader/efi_disk.c
> > index d2256713a8..1309e28134 100644
> > --- a/lib/efi_loader/efi_disk.c
> > +++ b/lib/efi_loader/efi_disk.c
> > @@ -687,6 +687,13 @@ int efi_disk_probe(void *ctx, struct event *event)
> > return -1;
> > }
> >
> > + /* only do the boot option management when UEFI sub-system is initialized */
> > + if (efi_obj_list_initialized == EFI_SUCCESS) {
> > + ret = efi_bootmgr_update_media_device_boot_option();
>
> Why should we rescan all devices if a single device is added?
Then, don't forget to call the 'remove' function in efi_disk_remove()
(or _delete_raw() and _delete_part()).
> The only place where we need the list of removable media devices is when
> executing the boot manager.
Not sure what you mean, but we may want to confirm available boot options
with efidebug or eficonfig before invoking the boot manager.
-Takahiro Akashi
>
> > + if (ret)
> > + return -1;
> > + }
> > +
> > return 0;
> > }
> >
> > diff --git a/lib/efi_loader/efi_helper.c b/lib/efi_loader/efi_helper.c
> > index 1f4ab2b419..cdfd16ea77 100644
> > --- a/lib/efi_loader/efi_helper.c
> > +++ b/lib/efi_loader/efi_helper.c
> > @@ -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)
>
> This function should be static. The exported function to delete a boot
> option should not use the index in the boot order in their interface but
> the number encoded in the variable name.
>
> We can simplify the function:
>
> Return -1 if the entry is not found and the index otherwise.
>
> > +{
> > + u32 i;
> > +
> > + for (i = 0; i < num; i++) {
> > + if (target == bootorder[i]) {
> > + if (index)
> > + *index = i;
> > +
> > + return true;
> > + }
> > + }
> > +
> > + return false;
> > +}
> > diff --git a/lib/efi_loader/efi_variable.c b/lib/efi_loader/efi_variable.c
> > index be95ed44e6..2f251553e1 100644
> > --- a/lib/efi_loader/efi_variable.c
> > +++ b/lib/efi_loader/efi_variable.c
> > @@ -476,6 +476,10 @@ efi_status_t efi_init_variables(void)
> > log_err("Invalid EFI variable seed\n");
> > }
> >
> > + ret = efi_init_secure_state();
> > + if (ret != EFI_SUCCESS)
> > + return ret;
> >
> > - return efi_init_secure_state();
> > + /* update boot option management after variable service initialized */
> > + return efi_bootmgr_update_media_device_boot_option();
>
> The right place to call the function might be efi_init_obj_list().
>
> Best regards
>
> Heinrich
>
> > }
> > diff --git a/lib/efi_loader/efi_variable_tee.c b/lib/efi_loader/efi_variable_tee.c
> > index dfef18435d..a48d313ef0 100644
> > --- a/lib/efi_loader/efi_variable_tee.c
> > +++ b/lib/efi_loader/efi_variable_tee.c
> > @@ -748,5 +748,6 @@ efi_status_t efi_init_variables(void)
> > if (ret != EFI_SUCCESS)
> > return ret;
> >
> > - return EFI_SUCCESS;
> > + /* update boot option management after variable service initialized */
> > + return efi_bootmgr_update_media_device_boot_option();
> > }
>
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