| /*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/ |
| |
| /*** |
| This file is part of systemd. |
| |
| Copyright 2013 Lennart Poettering |
| |
| systemd is free software; you can redistribute it and/or modify it |
| under the terms of the GNU Lesser General Public License as published by |
| the Free Software Foundation; either version 2.1 of the License, or |
| (at your option) any later version. |
| |
| systemd is distributed in the hope that it will be useful, but |
| WITHOUT ANY WARRANTY; without even the implied warranty of |
| MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
| Lesser General Public License for more details. |
| |
| You should have received a copy of the GNU Lesser General Public License |
| along with systemd; If not, see <http://www.gnu.org/licenses/>. |
| ***/ |
| |
| #include <unistd.h> |
| #include <string.h> |
| #include <fcntl.h> |
| |
| #include "util.h" |
| #include "utf8.h" |
| #include "virt.h" |
| #include "efivars.h" |
| |
| #ifdef 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 |
| |
| struct boot_option { |
| uint32_t attr; |
| uint16_t path_len; |
| uint16_t title[]; |
| } _packed_; |
| |
| 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_; |
| |
| struct device_path { |
| uint8_t type; |
| uint8_t sub_type; |
| uint16_t length; |
| union { |
| uint16_t path[0]; |
| struct drive_path drive; |
| }; |
| } _packed_; |
| |
| bool is_efi_boot(void) { |
| return access("/sys/firmware/efi", F_OK) >= 0; |
| } |
| |
| static int read_flag(const char *varname) { |
| int r; |
| _cleanup_free_ void *v = NULL; |
| size_t s; |
| uint8_t b; |
| |
| 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; |
| r = b > 0; |
| return r; |
| } |
| |
| 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) { |
| int r; |
| size_t s; |
| uint64_t b; |
| _cleanup_free_ void *v = NULL; |
| |
| if (!is_efi_boot() || detect_container(NULL) > 0) |
| return -EOPNOTSUPP; |
| |
| r = efi_get_variable(EFI_VENDOR_GLOBAL, "OsIndicationsSupported", NULL, &v, &s); |
| if (r < 0) |
| return r; |
| else if (s != sizeof(uint64_t)) |
| return -EINVAL; |
| |
| b = *(uint64_t *)v; |
| b &= EFI_OS_INDICATIONS_BOOT_TO_FW_UI; |
| return b > 0 ? 0 : -EOPNOTSUPP; |
| } |
| |
| static int get_os_indications(uint64_t *os_indication) { |
| int r; |
| size_t s; |
| _cleanup_free_ void *v = NULL; |
| |
| 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 -EIO; |
| 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 = buf; |
| buf = NULL; |
| *size = (size_t) st.st_size - 4; |
| |
| if (attribute) |
| *attribute = a; |
| |
| 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; |
| |
| assert(name); |
| |
| 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; |
| |
| if (size == 0) { |
| if (unlink(p) < 0) |
| return -errno; |
| return 0; |
| } |
| |
| fd = open(p, O_WRONLY|O_CREAT|O_NOCTTY|O_CLOEXEC, 0644); |
| if (fd < 0) |
| return -errno; |
| |
| buf = malloc(sizeof(uint32_t) + size); |
| if (!buf) |
| return -ENOMEM; |
| |
| buf->attr = EFI_VARIABLE_NON_VOLATILE|EFI_VARIABLE_BOOTSERVICE_ACCESS|EFI_VARIABLE_RUNTIME_ACCESS; |
| memcpy(buf->buf, value, size); |
| |
| return loop_write(fd, buf, sizeof(uint32_t) + size, false); |
| } |
| |
| 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; |
| } |
| |
| static size_t utf16_size(const uint16_t *s) { |
| size_t l = 0; |
| |
| while (s[l] > 0) |
| l++; |
| |
| return (l+1) * sizeof(uint16_t); |
| } |
| |
| static void efi_guid_to_id128(const void *guid, sd_id128_t *id128) { |
| struct uuid { |
| uint32_t u1; |
| uint16_t u2; |
| uint16_t u3; |
| uint8_t u4[8]; |
| } _packed_; |
| const struct uuid *uuid = guid; |
| |
| id128->bytes[0] = (uuid->u1 >> 24) & 0xff; |
| id128->bytes[1] = (uuid->u1 >> 16) & 0xff; |
| id128->bytes[2] = (uuid->u1 >> 8) & 0xff; |
| id128->bytes[3] = (uuid->u1) & 0xff; |
| id128->bytes[4] = (uuid->u2 >> 8) & 0xff; |
| id128->bytes[5] = (uuid->u2) & 0xff; |
| id128->bytes[6] = (uuid->u3 >> 8) & 0xff; |
| id128->bytes[7] = (uuid->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; |
| size_t title_size; |
| _cleanup_free_ char *s = NULL, *p = NULL; |
| sd_id128_t p_uuid = SD_ID128_NULL; |
| int r; |
| |
| 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 < sizeof(struct boot_option)) |
| return -ENOENT; |
| |
| header = (struct boot_option *)buf; |
| title_size = utf16_size(header->title); |
| if (title_size > l - offsetof(struct boot_option, title)) |
| return -EINVAL; |
| |
| 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; |
| |
| dbuf = buf + offsetof(struct boot_option, title) + title_size; |
| 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); |
| efi_tilt_backslashes(p); |
| continue; |
| } |
| } |
| } |
| |
| if (title) { |
| *title = s; |
| s = NULL; |
| } |
| if (part_uuid) |
| *part_uuid = p_uuid; |
| if (path) { |
| *path = p; |
| p = NULL; |
| } |
| 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'; |
| } |
| |
| struct guid { |
| uint32_t u1; |
| uint16_t u2; |
| uint16_t u3; |
| uint8_t u4[8]; |
| } _packed_; |
| |
| static void id128_to_efi_guid(sd_id128_t id, void *guid) { |
| struct guid *uuid = guid; |
| |
| uuid->u1 = id.bytes[0] << 24 | id.bytes[1] << 16 | id.bytes[2] << 8 | id.bytes[3]; |
| uuid->u2 = id.bytes[4] << 8 | id.bytes[5]; |
| uuid->u3 = id.bytes[6] << 8 | id.bytes[7]; |
| memcpy(uuid->u4, id.bytes+8, sizeof(uuid->u4)); |
| } |
| |
| 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) { |
| char boot_id[9]; |
| size_t size; |
| size_t title_len; |
| size_t path_len; |
| struct boot_option *option; |
| struct device_path *devicep; |
| _cleanup_free_ char *buf = NULL; |
| |
| title_len = (strlen(title)+1) * 2; |
| path_len = (strlen(path)+1) * 2; |
| |
| buf = calloc(sizeof(struct boot_option) + title_len + |
| sizeof(struct drive_path) + |
| sizeof(struct device_path) + path_len, 1); |
| 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); |
| devicep->drive.part_nr = part; |
| devicep->drive.part_start = pstart; |
| devicep->drive.part_size = psize; |
| devicep->drive.signature_type = SIGNATURE_TYPE_GUID; |
| devicep->drive.mbr_type = MBR_TYPE_EFI_PARTITION_TABLE_HEADER; |
| id128_to_efi_guid(part_uuid, devicep->drive.signature); |
| 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]; |
| |
| 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; |
| |
| 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 = buf; |
| buf = NULL; |
| return (int) (l / sizeof(uint16_t)); |
| } |
| |
| int efi_set_boot_order(uint16_t *order, size_t n) { |
| return efi_set_variable(EFI_VENDOR_GLOBAL, "BootOrder", order, n * sizeof(uint16_t)); |
| } |
| |
| static int boot_id_hex(const char s[4]) { |
| int i; |
| int id = 0; |
| |
| 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 void *_a, const void *_b) { |
| const uint16_t *a = _a, *b = _b; |
| |
| return (int)*a - (int)*b; |
| } |
| |
| int efi_get_boot_options(uint16_t **options) { |
| _cleanup_closedir_ DIR *dir = NULL; |
| struct dirent *de; |
| _cleanup_free_ uint16_t *list = NULL; |
| size_t alloc = 0; |
| int count = 0; |
| |
| assert(options); |
| |
| 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; |
| } |
| |
| qsort_safe(list, count, sizeof(uint16_t), cmp_uint16); |
| |
| *options = list; |
| list = NULL; |
| 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); |
| |
| 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]; |
| |
| 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; |
| } |
| |
| #endif |
| |
| char *efi_tilt_backslashes(char *s) { |
| char *p; |
| |
| for (p = s; *p; p++) |
| if (*p == '\\') |
| *p = '/'; |
| |
| return s; |
| } |