| /* SPDX-License-Identifier: LGPL-2.1+ */ |
| |
| #include <dirent.h> |
| #include <errno.h> |
| #include <fcntl.h> |
| #include <limits.h> |
| #include <linux/fs.h> |
| #include <stdio.h> |
| #include <stdlib.h> |
| #include <string.h> |
| #include <sys/stat.h> |
| #include <unistd.h> |
| |
| #include "sd-id128.h" |
| |
| #include "alloc-util.h" |
| #include "chattr-util.h" |
| #include "dirent-util.h" |
| #include "efivars.h" |
| #include "fd-util.h" |
| #include "io-util.h" |
| #include "macro.h" |
| #include "parse-util.h" |
| #include "sort-util.h" |
| #include "stdio-util.h" |
| #include "strv.h" |
| #include "time-util.h" |
| #include "utf8.h" |
| #include "virt.h" |
| |
| #if ENABLE_EFI |
| |
| #define LOAD_OPTION_ACTIVE 0x00000001 |
| #define MEDIA_DEVICE_PATH 0x04 |
| #define MEDIA_HARDDRIVE_DP 0x01 |
| #define MEDIA_FILEPATH_DP 0x04 |
| #define SIGNATURE_TYPE_GUID 0x02 |
| #define MBR_TYPE_EFI_PARTITION_TABLE_HEADER 0x02 |
| #define END_DEVICE_PATH_TYPE 0x7f |
| #define END_ENTIRE_DEVICE_PATH_SUBTYPE 0xff |
| #define EFI_OS_INDICATIONS_BOOT_TO_FW_UI 0x0000000000000001 |
| |
| #define boot_option__contents { \ |
| uint32_t attr; \ |
| uint16_t path_len; \ |
| uint16_t title[]; \ |
| } |
| |
| struct boot_option boot_option__contents; |
| struct boot_option__packed boot_option__contents _packed_; |
| assert_cc(offsetof(struct boot_option, title) == offsetof(struct boot_option__packed, title)); |
| /* sizeof(struct boot_option) != sizeof(struct boot_option__packed), so |
| * the *size* of the structure should not be used anywhere below. */ |
| |
| struct drive_path { |
| uint32_t part_nr; |
| uint64_t part_start; |
| uint64_t part_size; |
| char signature[16]; |
| uint8_t mbr_type; |
| uint8_t signature_type; |
| } _packed_; |
| |
| #define device_path__contents { \ |
| uint8_t type; \ |
| uint8_t sub_type; \ |
| uint16_t length; \ |
| union { \ |
| uint16_t path[0]; \ |
| struct drive_path drive; \ |
| }; \ |
| } |
| |
| struct device_path device_path__contents; |
| struct device_path__packed device_path__contents _packed_; |
| assert_cc(sizeof(struct device_path) == sizeof(struct device_path__packed)); |
| |
| bool is_efi_boot(void) { |
| if (detect_container() > 0) |
| return false; |
| |
| return access("/sys/firmware/efi/", F_OK) >= 0; |
| } |
| |
| static int read_flag(const char *varname) { |
| _cleanup_free_ void *v = NULL; |
| uint8_t b; |
| size_t s; |
| int r; |
| |
| if (!is_efi_boot()) /* If this is not an EFI boot, assume the queried flags are zero */ |
| return 0; |
| |
| r = efi_get_variable(EFI_VENDOR_GLOBAL, varname, NULL, &v, &s); |
| if (r < 0) |
| return r; |
| |
| if (s != 1) |
| return -EINVAL; |
| |
| b = *(uint8_t *)v; |
| return !!b; |
| } |
| |
| bool is_efi_secure_boot(void) { |
| return read_flag("SecureBoot") > 0; |
| } |
| |
| bool is_efi_secure_boot_setup_mode(void) { |
| return read_flag("SetupMode") > 0; |
| } |
| |
| int efi_reboot_to_firmware_supported(void) { |
| _cleanup_free_ void *v = NULL; |
| uint64_t b; |
| size_t s; |
| int r; |
| |
| if (!is_efi_boot()) |
| return -EOPNOTSUPP; |
| |
| r = efi_get_variable(EFI_VENDOR_GLOBAL, "OsIndicationsSupported", NULL, &v, &s); |
| if (r == -ENOENT) /* variable doesn't exist? it's not supported then */ |
| return -EOPNOTSUPP; |
| if (r < 0) |
| return r; |
| if (s != sizeof(uint64_t)) |
| return -EINVAL; |
| |
| b = *(uint64_t*) v; |
| if (!(b & EFI_OS_INDICATIONS_BOOT_TO_FW_UI)) |
| return -EOPNOTSUPP; /* bit unset? it's not supported then */ |
| |
| return 0; |
| } |
| |
| static int get_os_indications(uint64_t *os_indication) { |
| _cleanup_free_ void *v = NULL; |
| size_t s; |
| int r; |
| |
| /* Let's verify general support first */ |
| r = efi_reboot_to_firmware_supported(); |
| if (r < 0) |
| return r; |
| |
| r = efi_get_variable(EFI_VENDOR_GLOBAL, "OsIndications", NULL, &v, &s); |
| if (r == -ENOENT) { |
| /* Some firmware implementations that do support OsIndications and report that with |
| * OsIndicationsSupported will remove the OsIndications variable when it is unset. Let's pretend it's 0 |
| * then, to hide this implementation detail. Note that this call will return -ENOENT then only if the |
| * support for OsIndications is missing entirely, as determined by efi_reboot_to_firmware_supported() |
| * above. */ |
| *os_indication = 0; |
| return 0; |
| } else if (r < 0) |
| return r; |
| else if (s != sizeof(uint64_t)) |
| return -EINVAL; |
| |
| *os_indication = *(uint64_t *)v; |
| return 0; |
| } |
| |
| int efi_get_reboot_to_firmware(void) { |
| int r; |
| uint64_t b; |
| |
| r = get_os_indications(&b); |
| if (r < 0) |
| return r; |
| |
| return !!(b & EFI_OS_INDICATIONS_BOOT_TO_FW_UI); |
| } |
| |
| int efi_set_reboot_to_firmware(bool value) { |
| int r; |
| uint64_t b, b_new; |
| |
| r = get_os_indications(&b); |
| if (r < 0) |
| return r; |
| |
| if (value) |
| b_new = b | EFI_OS_INDICATIONS_BOOT_TO_FW_UI; |
| else |
| b_new = b & ~EFI_OS_INDICATIONS_BOOT_TO_FW_UI; |
| |
| /* Avoid writing to efi vars store if we can due to firmware bugs. */ |
| if (b != b_new) |
| return efi_set_variable(EFI_VENDOR_GLOBAL, "OsIndications", &b_new, sizeof(uint64_t)); |
| |
| return 0; |
| } |
| |
| int efi_get_variable( |
| sd_id128_t vendor, |
| const char *name, |
| uint32_t *attribute, |
| void **value, |
| size_t *size) { |
| |
| _cleanup_close_ int fd = -1; |
| _cleanup_free_ char *p = NULL; |
| uint32_t a; |
| ssize_t n; |
| struct stat st; |
| _cleanup_free_ void *buf = NULL; |
| |
| assert(name); |
| assert(value); |
| assert(size); |
| |
| if (asprintf(&p, |
| "/sys/firmware/efi/efivars/%s-%02x%02x%02x%02x-%02x%02x-%02x%02x-%02x%02x-%02x%02x%02x%02x%02x%02x", |
| name, SD_ID128_FORMAT_VAL(vendor)) < 0) |
| return -ENOMEM; |
| |
| fd = open(p, O_RDONLY|O_NOCTTY|O_CLOEXEC); |
| if (fd < 0) |
| return -errno; |
| |
| if (fstat(fd, &st) < 0) |
| return -errno; |
| if (st.st_size < 4) |
| return -ENODATA; |
| if (st.st_size > 4*1024*1024 + 4) |
| return -E2BIG; |
| |
| n = read(fd, &a, sizeof(a)); |
| if (n < 0) |
| return -errno; |
| if (n != sizeof(a)) |
| return -EIO; |
| |
| buf = malloc(st.st_size - 4 + 2); |
| if (!buf) |
| return -ENOMEM; |
| |
| n = read(fd, buf, (size_t) st.st_size - 4); |
| if (n < 0) |
| return -errno; |
| if (n != (ssize_t) st.st_size - 4) |
| return -EIO; |
| |
| /* Always NUL terminate (2 bytes, to protect UTF-16) */ |
| ((char*) buf)[st.st_size - 4] = 0; |
| ((char*) buf)[st.st_size - 4 + 1] = 0; |
| |
| *value = TAKE_PTR(buf); |
| *size = (size_t) st.st_size - 4; |
| |
| if (attribute) |
| *attribute = a; |
| |
| return 0; |
| } |
| |
| int efi_get_variable_string(sd_id128_t vendor, const char *name, char **p) { |
| _cleanup_free_ void *s = NULL; |
| size_t ss = 0; |
| int r; |
| char *x; |
| |
| r = efi_get_variable(vendor, name, NULL, &s, &ss); |
| if (r < 0) |
| return r; |
| |
| x = utf16_to_utf8(s, ss); |
| if (!x) |
| return -ENOMEM; |
| |
| *p = x; |
| return 0; |
| } |
| |
| int efi_set_variable( |
| sd_id128_t vendor, |
| const char *name, |
| const void *value, |
| size_t size) { |
| |
| struct var { |
| uint32_t attr; |
| char buf[]; |
| } _packed_ * _cleanup_free_ buf = NULL; |
| _cleanup_free_ char *p = NULL; |
| _cleanup_close_ int fd = -1; |
| bool saved_flags_valid = false; |
| unsigned saved_flags; |
| int r; |
| |
| assert(name); |
| assert(value || size == 0); |
| |
| if (asprintf(&p, |
| "/sys/firmware/efi/efivars/%s-%02x%02x%02x%02x-%02x%02x-%02x%02x-%02x%02x-%02x%02x%02x%02x%02x%02x", |
| name, SD_ID128_FORMAT_VAL(vendor)) < 0) |
| return -ENOMEM; |
| |
| /* Newer efivarfs protects variables that are not in a whitelist with FS_IMMUTABLE_FL by default, to protect |
| * them for accidental removal and modification. We are not changing these variables accidentally however, |
| * hence let's unset the bit first. */ |
| |
| r = chattr_path(p, 0, FS_IMMUTABLE_FL, &saved_flags); |
| if (r < 0 && r != -ENOENT) |
| log_debug_errno(r, "Failed to drop FS_IMMUTABLE_FL flag from '%s', ignoring: %m", p); |
| |
| saved_flags_valid = r >= 0; |
| |
| if (size == 0) { |
| if (unlink(p) < 0) { |
| r = -errno; |
| goto finish; |
| } |
| |
| return 0; |
| } |
| |
| fd = open(p, O_WRONLY|O_CREAT|O_NOCTTY|O_CLOEXEC, 0644); |
| if (fd < 0) { |
| r = -errno; |
| goto finish; |
| } |
| |
| buf = malloc(sizeof(uint32_t) + size); |
| if (!buf) { |
| r = -ENOMEM; |
| goto finish; |
| } |
| |
| buf->attr = EFI_VARIABLE_NON_VOLATILE|EFI_VARIABLE_BOOTSERVICE_ACCESS|EFI_VARIABLE_RUNTIME_ACCESS; |
| memcpy(buf->buf, value, size); |
| |
| r = loop_write(fd, buf, sizeof(uint32_t) + size, false); |
| if (r < 0) |
| goto finish; |
| |
| r = 0; |
| |
| finish: |
| if (saved_flags_valid) { |
| int q; |
| |
| /* Restore the original flags field, just in case */ |
| if (fd < 0) |
| q = chattr_path(p, saved_flags, FS_IMMUTABLE_FL, NULL); |
| else |
| q = chattr_fd(fd, saved_flags, FS_IMMUTABLE_FL, NULL); |
| if (q < 0) |
| log_debug_errno(q, "Failed to restore FS_IMMUTABLE_FL on '%s', ignoring: %m", p); |
| } |
| |
| return r; |
| } |
| |
| int efi_set_variable_string(sd_id128_t vendor, const char *name, const char *v) { |
| _cleanup_free_ char16_t *u16 = NULL; |
| |
| u16 = utf8_to_utf16(v, strlen(v)); |
| if (!u16) |
| return -ENOMEM; |
| |
| return efi_set_variable(vendor, name, u16, (char16_strlen(u16) + 1) * sizeof(char16_t)); |
| } |
| |
| static ssize_t utf16_size(const uint16_t *s, size_t buf_len_bytes) { |
| size_t l = 0; |
| |
| /* Returns the size of the string in bytes without the terminating two zero bytes */ |
| |
| if (buf_len_bytes % sizeof(uint16_t) != 0) |
| return -EINVAL; |
| |
| while (l < buf_len_bytes / sizeof(uint16_t)) { |
| if (s[l] == 0) |
| return (l + 1) * sizeof(uint16_t); |
| l++; |
| } |
| |
| return -EINVAL; /* The terminator was not found */ |
| } |
| |
| struct guid { |
| uint32_t u1; |
| uint16_t u2; |
| uint16_t u3; |
| uint8_t u4[8]; |
| } _packed_; |
| |
| static void efi_guid_to_id128(const void *guid, sd_id128_t *id128) { |
| uint32_t u1; |
| uint16_t u2, u3; |
| const struct guid *uuid = guid; |
| |
| memcpy(&u1, &uuid->u1, sizeof(uint32_t)); |
| id128->bytes[0] = (u1 >> 24) & 0xff; |
| id128->bytes[1] = (u1 >> 16) & 0xff; |
| id128->bytes[2] = (u1 >> 8) & 0xff; |
| id128->bytes[3] = u1 & 0xff; |
| memcpy(&u2, &uuid->u2, sizeof(uint16_t)); |
| id128->bytes[4] = (u2 >> 8) & 0xff; |
| id128->bytes[5] = u2 & 0xff; |
| memcpy(&u3, &uuid->u3, sizeof(uint16_t)); |
| id128->bytes[6] = (u3 >> 8) & 0xff; |
| id128->bytes[7] = u3 & 0xff; |
| memcpy(&id128->bytes[8], uuid->u4, sizeof(uuid->u4)); |
| } |
| |
| int efi_get_boot_option( |
| uint16_t id, |
| char **title, |
| sd_id128_t *part_uuid, |
| char **path, |
| bool *active) { |
| |
| char boot_id[9]; |
| _cleanup_free_ uint8_t *buf = NULL; |
| size_t l; |
| struct boot_option *header; |
| ssize_t title_size; |
| _cleanup_free_ char *s = NULL, *p = NULL; |
| sd_id128_t p_uuid = SD_ID128_NULL; |
| int r; |
| |
| if (!is_efi_boot()) |
| return -EOPNOTSUPP; |
| |
| xsprintf(boot_id, "Boot%04X", id); |
| r = efi_get_variable(EFI_VENDOR_GLOBAL, boot_id, NULL, (void **)&buf, &l); |
| if (r < 0) |
| return r; |
| if (l < offsetof(struct boot_option, title)) |
| return -ENOENT; |
| |
| header = (struct boot_option *)buf; |
| title_size = utf16_size(header->title, l - offsetof(struct boot_option, title)); |
| if (title_size < 0) |
| return title_size; |
| |
| if (title) { |
| s = utf16_to_utf8(header->title, title_size); |
| if (!s) |
| return -ENOMEM; |
| } |
| |
| if (header->path_len > 0) { |
| uint8_t *dbuf; |
| size_t dnext, doff; |
| |
| doff = offsetof(struct boot_option, title) + title_size; |
| dbuf = buf + doff; |
| if (header->path_len > l - doff) |
| return -EINVAL; |
| |
| dnext = 0; |
| while (dnext < header->path_len) { |
| struct device_path *dpath; |
| |
| dpath = (struct device_path *)(dbuf + dnext); |
| if (dpath->length < 4) |
| break; |
| |
| /* Type 0x7F – End of Hardware Device Path, Sub-Type 0xFF – End Entire Device Path */ |
| if (dpath->type == END_DEVICE_PATH_TYPE && dpath->sub_type == END_ENTIRE_DEVICE_PATH_SUBTYPE) |
| break; |
| |
| dnext += dpath->length; |
| |
| /* Type 0x04 – Media Device Path */ |
| if (dpath->type != MEDIA_DEVICE_PATH) |
| continue; |
| |
| /* Sub-Type 1 – Hard Drive */ |
| if (dpath->sub_type == MEDIA_HARDDRIVE_DP) { |
| /* 0x02 – GUID Partition Table */ |
| if (dpath->drive.mbr_type != MBR_TYPE_EFI_PARTITION_TABLE_HEADER) |
| continue; |
| |
| /* 0x02 – GUID signature */ |
| if (dpath->drive.signature_type != SIGNATURE_TYPE_GUID) |
| continue; |
| |
| if (part_uuid) |
| efi_guid_to_id128(dpath->drive.signature, &p_uuid); |
| continue; |
| } |
| |
| /* Sub-Type 4 – File Path */ |
| if (dpath->sub_type == MEDIA_FILEPATH_DP && !p && path) { |
| p = utf16_to_utf8(dpath->path, dpath->length-4); |
| if (!p) |
| return -ENOMEM; |
| |
| efi_tilt_backslashes(p); |
| continue; |
| } |
| } |
| } |
| |
| if (title) |
| *title = TAKE_PTR(s); |
| if (part_uuid) |
| *part_uuid = p_uuid; |
| if (path) |
| *path = TAKE_PTR(p); |
| if (active) |
| *active = !!(header->attr & LOAD_OPTION_ACTIVE); |
| |
| return 0; |
| } |
| |
| static void to_utf16(uint16_t *dest, const char *src) { |
| int i; |
| |
| for (i = 0; src[i] != '\0'; i++) |
| dest[i] = src[i]; |
| dest[i] = '\0'; |
| } |
| |
| static void id128_to_efi_guid(sd_id128_t id, void *guid) { |
| struct guid uuid = { |
| .u1 = id.bytes[0] << 24 | id.bytes[1] << 16 | id.bytes[2] << 8 | id.bytes[3], |
| .u2 = id.bytes[4] << 8 | id.bytes[5], |
| .u3 = id.bytes[6] << 8 | id.bytes[7], |
| }; |
| memcpy(uuid.u4, id.bytes+8, sizeof(uuid.u4)); |
| memcpy(guid, &uuid, sizeof(uuid)); |
| } |
| |
| static uint16_t *tilt_slashes(uint16_t *s) { |
| uint16_t *p; |
| |
| for (p = s; *p; p++) |
| if (*p == '/') |
| *p = '\\'; |
| |
| return s; |
| } |
| |
| int efi_add_boot_option( |
| uint16_t id, |
| const char *title, |
| uint32_t part, |
| uint64_t pstart, |
| uint64_t psize, |
| sd_id128_t part_uuid, |
| const char *path) { |
| |
| size_t size, title_len, path_len; |
| _cleanup_free_ char *buf = NULL; |
| struct boot_option *option; |
| struct device_path *devicep; |
| char boot_id[9]; |
| |
| if (!is_efi_boot()) |
| return -EOPNOTSUPP; |
| |
| title_len = (strlen(title)+1) * 2; |
| path_len = (strlen(path)+1) * 2; |
| |
| buf = malloc0(offsetof(struct boot_option, title) + title_len + |
| sizeof(struct drive_path) + |
| sizeof(struct device_path) + path_len); |
| if (!buf) |
| return -ENOMEM; |
| |
| /* header */ |
| option = (struct boot_option *)buf; |
| option->attr = LOAD_OPTION_ACTIVE; |
| option->path_len = offsetof(struct device_path, drive) + sizeof(struct drive_path) + |
| offsetof(struct device_path, path) + path_len + |
| offsetof(struct device_path, path); |
| to_utf16(option->title, title); |
| size = offsetof(struct boot_option, title) + title_len; |
| |
| /* partition info */ |
| devicep = (struct device_path *)(buf + size); |
| devicep->type = MEDIA_DEVICE_PATH; |
| devicep->sub_type = MEDIA_HARDDRIVE_DP; |
| devicep->length = offsetof(struct device_path, drive) + sizeof(struct drive_path); |
| memcpy(&devicep->drive.part_nr, &part, sizeof(uint32_t)); |
| memcpy(&devicep->drive.part_start, &pstart, sizeof(uint64_t)); |
| memcpy(&devicep->drive.part_size, &psize, sizeof(uint64_t)); |
| id128_to_efi_guid(part_uuid, devicep->drive.signature); |
| devicep->drive.mbr_type = MBR_TYPE_EFI_PARTITION_TABLE_HEADER; |
| devicep->drive.signature_type = SIGNATURE_TYPE_GUID; |
| size += devicep->length; |
| |
| /* path to loader */ |
| devicep = (struct device_path *)(buf + size); |
| devicep->type = MEDIA_DEVICE_PATH; |
| devicep->sub_type = MEDIA_FILEPATH_DP; |
| devicep->length = offsetof(struct device_path, path) + path_len; |
| to_utf16(devicep->path, path); |
| tilt_slashes(devicep->path); |
| size += devicep->length; |
| |
| /* end of path */ |
| devicep = (struct device_path *)(buf + size); |
| devicep->type = END_DEVICE_PATH_TYPE; |
| devicep->sub_type = END_ENTIRE_DEVICE_PATH_SUBTYPE; |
| devicep->length = offsetof(struct device_path, path); |
| size += devicep->length; |
| |
| xsprintf(boot_id, "Boot%04X", id); |
| return efi_set_variable(EFI_VENDOR_GLOBAL, boot_id, buf, size); |
| } |
| |
| int efi_remove_boot_option(uint16_t id) { |
| char boot_id[9]; |
| |
| if (!is_efi_boot()) |
| return -EOPNOTSUPP; |
| |
| xsprintf(boot_id, "Boot%04X", id); |
| return efi_set_variable(EFI_VENDOR_GLOBAL, boot_id, NULL, 0); |
| } |
| |
| int efi_get_boot_order(uint16_t **order) { |
| _cleanup_free_ void *buf = NULL; |
| size_t l; |
| int r; |
| |
| if (!is_efi_boot()) |
| return -EOPNOTSUPP; |
| |
| r = efi_get_variable(EFI_VENDOR_GLOBAL, "BootOrder", NULL, &buf, &l); |
| if (r < 0) |
| return r; |
| |
| if (l <= 0) |
| return -ENOENT; |
| |
| if (l % sizeof(uint16_t) > 0 || |
| l / sizeof(uint16_t) > INT_MAX) |
| return -EINVAL; |
| |
| *order = TAKE_PTR(buf); |
| return (int) (l / sizeof(uint16_t)); |
| } |
| |
| int efi_set_boot_order(uint16_t *order, size_t n) { |
| |
| if (!is_efi_boot()) |
| return -EOPNOTSUPP; |
| |
| return efi_set_variable(EFI_VENDOR_GLOBAL, "BootOrder", order, n * sizeof(uint16_t)); |
| } |
| |
| static int boot_id_hex(const char s[static 4]) { |
| int id = 0, i; |
| |
| for (i = 0; i < 4; i++) |
| if (s[i] >= '0' && s[i] <= '9') |
| id |= (s[i] - '0') << (3 - i) * 4; |
| else if (s[i] >= 'A' && s[i] <= 'F') |
| id |= (s[i] - 'A' + 10) << (3 - i) * 4; |
| else |
| return -EINVAL; |
| |
| return id; |
| } |
| |
| static int cmp_uint16(const uint16_t *a, const uint16_t *b) { |
| return CMP(*a, *b); |
| } |
| |
| int efi_get_boot_options(uint16_t **options) { |
| _cleanup_closedir_ DIR *dir = NULL; |
| _cleanup_free_ uint16_t *list = NULL; |
| struct dirent *de; |
| size_t alloc = 0; |
| int count = 0; |
| |
| assert(options); |
| |
| if (!is_efi_boot()) |
| return -EOPNOTSUPP; |
| |
| dir = opendir("/sys/firmware/efi/efivars/"); |
| if (!dir) |
| return -errno; |
| |
| FOREACH_DIRENT(de, dir, return -errno) { |
| int id; |
| |
| if (strncmp(de->d_name, "Boot", 4) != 0) |
| continue; |
| |
| if (strlen(de->d_name) != 45) |
| continue; |
| |
| if (strcmp(de->d_name + 8, "-8be4df61-93ca-11d2-aa0d-00e098032b8c") != 0) |
| continue; |
| |
| id = boot_id_hex(de->d_name + 4); |
| if (id < 0) |
| continue; |
| |
| if (!GREEDY_REALLOC(list, alloc, count + 1)) |
| return -ENOMEM; |
| |
| list[count++] = id; |
| } |
| |
| typesafe_qsort(list, count, cmp_uint16); |
| |
| *options = TAKE_PTR(list); |
| |
| return count; |
| } |
| |
| static int read_usec(sd_id128_t vendor, const char *name, usec_t *u) { |
| _cleanup_free_ char *j = NULL; |
| int r; |
| uint64_t x = 0; |
| |
| assert(name); |
| assert(u); |
| |
| r = efi_get_variable_string(EFI_VENDOR_LOADER, name, &j); |
| if (r < 0) |
| return r; |
| |
| r = safe_atou64(j, &x); |
| if (r < 0) |
| return r; |
| |
| *u = x; |
| return 0; |
| } |
| |
| int efi_loader_get_boot_usec(usec_t *firmware, usec_t *loader) { |
| uint64_t x, y; |
| int r; |
| |
| assert(firmware); |
| assert(loader); |
| |
| if (!is_efi_boot()) |
| return -EOPNOTSUPP; |
| |
| r = read_usec(EFI_VENDOR_LOADER, "LoaderTimeInitUSec", &x); |
| if (r < 0) |
| return r; |
| |
| r = read_usec(EFI_VENDOR_LOADER, "LoaderTimeExecUSec", &y); |
| if (r < 0) |
| return r; |
| |
| if (y == 0 || y < x) |
| return -EIO; |
| |
| if (y > USEC_PER_HOUR) |
| return -EIO; |
| |
| *firmware = x; |
| *loader = y; |
| |
| return 0; |
| } |
| |
| int efi_loader_get_device_part_uuid(sd_id128_t *u) { |
| _cleanup_free_ char *p = NULL; |
| int r, parsed[16]; |
| |
| if (!is_efi_boot()) |
| return -EOPNOTSUPP; |
| |
| r = efi_get_variable_string(EFI_VENDOR_LOADER, "LoaderDevicePartUUID", &p); |
| if (r < 0) |
| return r; |
| |
| if (sscanf(p, "%02x%02x%02x%02x-%02x%02x-%02x%02x-%02x%02x-%02x%02x%02x%02x%02x%02x", |
| &parsed[0], &parsed[1], &parsed[2], &parsed[3], |
| &parsed[4], &parsed[5], &parsed[6], &parsed[7], |
| &parsed[8], &parsed[9], &parsed[10], &parsed[11], |
| &parsed[12], &parsed[13], &parsed[14], &parsed[15]) != 16) |
| return -EIO; |
| |
| if (u) { |
| unsigned i; |
| |
| for (i = 0; i < ELEMENTSOF(parsed); i++) |
| u->bytes[i] = parsed[i]; |
| } |
| |
| return 0; |
| } |
| |
| int efi_loader_get_entries(char ***ret) { |
| _cleanup_free_ char16_t *entries = NULL; |
| _cleanup_strv_free_ char **l = NULL; |
| size_t size, i, start; |
| int r; |
| |
| assert(ret); |
| |
| if (!is_efi_boot()) |
| return -EOPNOTSUPP; |
| |
| r = efi_get_variable(EFI_VENDOR_LOADER, "LoaderEntries", NULL, (void**) &entries, &size); |
| if (r < 0) |
| return r; |
| |
| /* The variable contains a series of individually NUL terminated UTF-16 strings. */ |
| |
| for (i = 0, start = 0;; i++) { |
| _cleanup_free_ char *decoded = NULL; |
| bool end; |
| |
| /* Is this the end of the variable's data? */ |
| end = i * sizeof(char16_t) >= size; |
| |
| /* Are we in the middle of a string? (i.e. not at the end of the variable, nor at a NUL terminator?) If |
| * so, let's go to the next entry. */ |
| if (!end && entries[i] != 0) |
| continue; |
| |
| /* We reached the end of a string, let's decode it into UTF-8 */ |
| decoded = utf16_to_utf8(entries + start, (i - start) * sizeof(char16_t)); |
| if (!decoded) |
| return -ENOMEM; |
| |
| if (efi_loader_entry_name_valid(decoded)) { |
| r = strv_consume(&l, TAKE_PTR(decoded)); |
| if (r < 0) |
| return r; |
| } else |
| log_debug("Ignoring invalid loader entry '%s'.", decoded); |
| |
| /* We reached the end of the variable */ |
| if (end) |
| break; |
| |
| /* Continue after the NUL byte */ |
| start = i + 1; |
| } |
| |
| *ret = TAKE_PTR(l); |
| return 0; |
| } |
| |
| int efi_loader_get_features(uint64_t *ret) { |
| _cleanup_free_ void *v = NULL; |
| size_t s; |
| int r; |
| |
| if (!is_efi_boot()) { |
| *ret = 0; |
| return 0; |
| } |
| |
| r = efi_get_variable(EFI_VENDOR_LOADER, "LoaderFeatures", NULL, &v, &s); |
| if (r == -ENOENT) { |
| _cleanup_free_ char *info = NULL; |
| |
| /* The new (v240+) LoaderFeatures variable is not supported, let's see if it's systemd-boot at all */ |
| r = efi_get_variable_string(EFI_VENDOR_LOADER, "LoaderInfo", &info); |
| if (r < 0) { |
| if (r != -ENOENT) |
| return r; |
| |
| /* Variable not set, definitely means not systemd-boot */ |
| |
| } else if (first_word(info, "systemd-boot")) { |
| |
| /* An older systemd-boot version. Let's hardcode the feature set, since it was pretty |
| * static in all its versions. */ |
| |
| *ret = EFI_LOADER_FEATURE_CONFIG_TIMEOUT | |
| EFI_LOADER_FEATURE_ENTRY_DEFAULT | |
| EFI_LOADER_FEATURE_ENTRY_ONESHOT; |
| |
| return 0; |
| } |
| |
| /* No features supported */ |
| *ret = 0; |
| return 0; |
| } |
| if (r < 0) |
| return r; |
| |
| if (s != sizeof(uint64_t)) |
| return log_debug_errno(SYNTHETIC_ERRNO(EINVAL), |
| "LoaderFeatures EFI variable doesn't have the right size."); |
| |
| memcpy(ret, v, sizeof(uint64_t)); |
| return 0; |
| } |
| |
| #endif |
| |
| bool efi_loader_entry_name_valid(const char *s) { |
| if (isempty(s)) |
| return false; |
| |
| if (strlen(s) > FILENAME_MAX) /* Make sure entry names fit in filenames */ |
| return false; |
| |
| return in_charset(s, ALPHANUMERICAL "-_."); |
| } |
| |
| char *efi_tilt_backslashes(char *s) { |
| char *p; |
| |
| for (p = s; *p; p++) |
| if (*p == '\\') |
| *p = '/'; |
| |
| return s; |
| } |