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-rw-r--r--src/shared/efivars.c715
1 files changed, 0 insertions, 715 deletions
diff --git a/src/shared/efivars.c b/src/shared/efivars.c
deleted file mode 100644
index 8631a5a5d9..0000000000
--- a/src/shared/efivars.c
+++ /dev/null
@@ -1,715 +0,0 @@
-/***
- 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 <dirent.h>
-#include <errno.h>
-#include <fcntl.h>
-#include <limits.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 "dirent-util.h"
-#include "efivars.h"
-#include "fd-util.h"
-#include "io-util.h"
-#include "macro.h"
-#include "parse-util.h"
-#include "stdio-util.h"
-#include "time-util.h"
-#include "utf8.h"
-#include "util.h"
-#include "virt.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() > 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;
-}
generated by cgit v1.2.3 (git 2.25.1) at 2024-06-01 13:22:32 +0000