/* SPDX-License-Identifier: LGPL-2.1-or-later */
-#include <stdlib.h>
-#include <sys/stat.h>
-#include <unistd.h>
-
#include "alloc-util.h"
-#include "dirent-util.h"
+#include "efi-api.h"
#include "efi-loader.h"
-#include "efivars.h"
-#include "fd-util.h"
-#include "io-util.h"
+#include "env-util.h"
#include "parse-util.h"
-#include "sort-util.h"
+#include "path-util.h"
#include "stat-util.h"
-#include "stdio-util.h"
-#include "string-util.h"
+#include "strv.h"
+#include "tpm2-pcr.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));
-
-int efi_reboot_to_firmware_supported(void) {
- _cleanup_free_ void *v = NULL;
- static int cache = -1;
- uint64_t b;
- size_t s;
- int r;
-
- if (cache > 0)
- return 0;
- if (cache == 0)
- return -EOPNOTSUPP;
-
- if (!is_efi_boot())
- goto not_supported;
-
- r = efi_get_variable(EFI_VENDOR_GLOBAL, "OsIndicationsSupported", NULL, &v, &s);
- if (r == -ENOENT)
- goto not_supported; /* variable doesn't exist? it's not supported then */
- 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))
- goto not_supported; /* bit unset? it's not supported then */
-
- cache = 1;
- return 0;
-
-not_supported:
- cache = 0;
- return -EOPNOTSUPP;
-}
-
-static int get_os_indications(uint64_t *ret) {
- static struct stat cache_stat = {};
- _cleanup_free_ void *v = NULL;
- _cleanup_free_ char *fn = NULL;
- static uint64_t cache;
- struct stat new_stat;
- size_t s;
- int r;
-
- assert(ret);
-
- /* Let's verify general support first */
- r = efi_reboot_to_firmware_supported();
- if (r < 0)
- return r;
-
- fn = efi_variable_path(EFI_VENDOR_GLOBAL, "OsIndications");
- if (!fn)
- return -ENOMEM;
-
- /* stat() the EFI variable, to see if the mtime changed. If it did we need to cache again. */
- if (stat(fn, &new_stat) < 0) {
- if (errno != ENOENT)
- return -errno;
-
- /* Doesn't exist? Then we can exit early (also see below) */
- *ret = 0;
- return 0;
-
- } else if (stat_inode_unmodified(&new_stat, &cache_stat)) {
- /* inode didn't change, we can return the cached value */
- *ret = cache;
- return 0;
- }
-
- 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. */
- *ret = 0;
- return 0;
- }
- if (r < 0)
- return r;
- if (s != sizeof(uint64_t))
- return -EINVAL;
-
- cache_stat = new_stat;
- *ret = cache = *(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;
-
- b_new = UPDATE_FLAG(b, EFI_OS_INDICATIONS_BOOT_TO_FW_UI, value);
-
- /* 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;
-}
-
-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;
-
- assert(s);
-
- 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) {
+static int read_usec(const char *variable, usec_t *ret) {
_cleanup_free_ char *j = NULL;
- int r;
uint64_t x = 0;
+ int r;
- assert(name);
- assert(u);
+ assert(variable);
+ assert(ret);
- r = efi_get_variable_string(EFI_VENDOR_LOADER, name, &j);
+ r = efi_get_variable_string(variable, &j);
if (r < 0)
return r;
if (r < 0)
return r;
- *u = x;
+ *ret = x;
return 0;
}
-int efi_loader_get_boot_usec(usec_t *firmware, usec_t *loader) {
+int efi_loader_get_boot_usec(usec_t *ret_firmware, usec_t *ret_loader) {
uint64_t x, y;
int r;
- assert(firmware);
- assert(loader);
+ assert(ret_firmware);
+ assert(ret_loader);
if (!is_efi_boot())
return -EOPNOTSUPP;
- r = read_usec(EFI_VENDOR_LOADER, "LoaderTimeInitUSec", &x);
+ r = read_usec(EFI_LOADER_VARIABLE(LoaderTimeInitUSec), &x);
if (r < 0)
return log_debug_errno(r, "Failed to read LoaderTimeInitUSec: %m");
- r = read_usec(EFI_VENDOR_LOADER, "LoaderTimeExecUSec", &y);
+ r = read_usec(EFI_LOADER_VARIABLE(LoaderTimeExecUSec), &y);
if (r < 0)
return log_debug_errno(r, "Failed to read LoaderTimeExecUSec: %m");
"Bad LoaderTimeInitUSec=%"PRIu64", LoaderTimeExecUSec=%" PRIu64"; refusing.",
x, y);
- *firmware = x;
- *loader = y;
-
+ *ret_firmware = x;
+ *ret_loader = y;
return 0;
}
-int efi_loader_get_device_part_uuid(sd_id128_t *u) {
+int efi_loader_get_device_part_uuid(sd_id128_t *ret) {
_cleanup_free_ char *p = NULL;
- int r, parsed[16];
+ int r;
+ unsigned parsed[16];
if (!is_efi_boot())
return -EOPNOTSUPP;
- r = efi_get_variable_string(EFI_VENDOR_LOADER, "LoaderDevicePartUUID", &p);
+ r = efi_get_variable_string(EFI_LOADER_VARIABLE(LoaderDevicePartUUID), &p);
if (r < 0)
return r;
&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];
- }
+ if (ret)
+ for (unsigned i = 0; i < ELEMENTSOF(parsed); i++)
+ ret->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;
+ size_t size;
int r;
assert(ret);
if (!is_efi_boot())
return -EOPNOTSUPP;
- r = efi_get_variable(EFI_VENDOR_LOADER, "LoaderEntries", NULL, (void**) &entries, &size);
+ r = efi_get_variable(EFI_LOADER_VARIABLE(LoaderEntries), NULL, (void**) &entries, &size);
if (r < 0)
return r;
- /* The variable contains a series of individually NUL terminated UTF-16 strings. */
+ /* The variable contains a series of individually NUL terminated UTF-16 strings. We gracefully
+ * consider the final NUL byte optional (i.e. the last string may or may not end in a NUL byte).*/
- for (i = 0, start = 0;; i++) {
+ for (size_t i = 0, start = 0;; i++) {
_cleanup_free_ char *decoded = NULL;
bool end;
if (!end && entries[i] != 0)
continue;
+ /* Empty string at the end of variable? That's the trailer, we are done (i.e. we have a final
+ * NUL terminator). */
+ if (end && start == i)
+ break;
+
/* 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)
} else
log_debug("Ignoring invalid loader entry '%s'.", decoded);
- /* We reached the end of the variable */
+ /* Exit the loop if we reached the end of the variable (i.e. we do not have a final NUL
+ * terminator) */
if (end)
break;
size_t s;
int r;
+ assert(ret);
+
if (!is_efi_boot()) {
*ret = 0;
return 0;
}
- r = efi_get_variable(EFI_VENDOR_LOADER, "LoaderFeatures", NULL, &v, &s);
+ r = efi_get_variable(EFI_LOADER_VARIABLE(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);
+ r = efi_get_variable_string(EFI_LOADER_VARIABLE(LoaderInfo), &info);
if (r < 0) {
if (r != -ENOENT)
return r;
return 0;
}
+int efi_stub_get_features(uint64_t *ret) {
+ _cleanup_free_ void *v = NULL;
+ size_t s;
+ int r;
+
+ assert(ret);
+
+ if (!is_efi_boot()) {
+ *ret = 0;
+ return 0;
+ }
+
+ r = efi_get_variable(EFI_LOADER_VARIABLE(StubFeatures), NULL, &v, &s);
+ if (r == -ENOENT) {
+ _cleanup_free_ char *info = NULL;
+
+ /* The new (v252+) StubFeatures variable is not supported, let's see if it's systemd-stub at all */
+ r = efi_get_variable_string(EFI_LOADER_VARIABLE(StubInfo), &info);
+ if (r < 0) {
+ if (r != -ENOENT)
+ return r;
+
+ /* Variable not set, definitely means not systemd-stub */
+
+ } else if (first_word(info, "systemd-stub")) {
+
+ /* An older systemd-stub version. Let's hardcode the feature set, since it was pretty
+ * static in all its versions. */
+
+ *ret = EFI_STUB_FEATURE_REPORT_BOOT_PARTITION;
+ 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),
+ "StubFeatures EFI variable doesn't have the right size.");
+
+ memcpy(ret, v, sizeof(uint64_t));
+ return 0;
+}
+
+int efi_measured_uki(int log_level) {
+ _cleanup_free_ char *pcr_string = NULL;
+ static int cached = -1;
+ unsigned pcr_nr;
+ int r;
+
+ if (cached >= 0)
+ return cached;
+
+ /* Checks if we are booted on a kernel with sd-stub which measured the kernel into PCR 11 on a TPM2
+ * chip. Or in other words, if we are running on a TPM enabled UKI. (TPM 1.2 situations are ignored.)
+ *
+ * Returns == 0 and > 0 depending on the result of the test. Returns -EREMOTE if we detected a stub
+ * being used, but it measured things into a different PCR than we are configured for in
+ * userspace. (i.e. we expect PCR 11 being used for this by both sd-stub and us) */
+
+ r = secure_getenv_bool("SYSTEMD_FORCE_MEASURE"); /* Give user a chance to override the variable test,
+ * for debugging purposes */
+ if (r >= 0)
+ return (cached = r);
+ if (r != -ENXIO)
+ log_debug_errno(r, "Failed to parse $SYSTEMD_FORCE_MEASURE, ignoring: %m");
+
+ if (!efi_has_tpm2())
+ return (cached = 0);
+
+ r = efi_get_variable_string(EFI_LOADER_VARIABLE(StubPcrKernelImage), &pcr_string);
+ if (r == -ENOENT)
+ return (cached = 0);
+ if (r < 0)
+ return log_full_errno(log_level, r,
+ "Failed to get StubPcrKernelImage EFI variable: %m");
+
+ r = safe_atou(pcr_string, &pcr_nr);
+ if (r < 0)
+ return log_full_errno(log_level, r,
+ "Failed to parse StubPcrKernelImage EFI variable: %s", pcr_string);
+ if (pcr_nr != TPM2_PCR_KERNEL_BOOT)
+ return log_full_errno(log_level, SYNTHETIC_ERRNO(EREMOTE),
+ "Kernel stub measured kernel image into PCR %u, which is different than expected %i.",
+ pcr_nr, TPM2_PCR_KERNEL_BOOT);
+
+ return (cached = 1);
+}
+
int efi_loader_get_config_timeout_one_shot(usec_t *ret) {
- _cleanup_free_ char *v = NULL, *fn = NULL;
+ _cleanup_free_ char *v = NULL;
static struct stat cache_stat = {};
struct stat new_stat;
static usec_t cache;
assert(ret);
- fn = efi_variable_path(EFI_VENDOR_LOADER, "LoaderConfigTimeoutOneShot");
- if (!fn)
- return -ENOMEM;
-
- /* stat() the EFI variable, to see if the mtime changed. If it did we need to cache again. */
- if (stat(fn, &new_stat) < 0)
+ /* stat() the EFI variable, to see if the mtime changed. If it did, we need to cache again. */
+ if (stat(EFIVAR_PATH(EFI_LOADER_VARIABLE(LoaderConfigTimeoutOneShot)), &new_stat) < 0)
return -errno;
if (stat_inode_unmodified(&new_stat, &cache_stat)) {
return 0;
}
- r = efi_get_variable_string(EFI_VENDOR_LOADER, "LoaderConfigTimeoutOneShot", &v);
+ r = efi_get_variable_string(EFI_LOADER_VARIABLE(LoaderConfigTimeoutOneShot), &v);
if (r < 0)
return r;
return -ERANGE;
cache_stat = new_stat;
- *ret = cache = sec * USEC_PER_SEC; /* return in µs */
+ *ret = cache = sec * USEC_PER_SEC; /* return in μs */
return 0;
}
int efi_loader_update_entry_one_shot_cache(char **cache, struct stat *cache_stat) {
- _cleanup_free_ char *fn = NULL, *v = NULL;
+ _cleanup_free_ char *v = NULL;
struct stat new_stat;
int r;
assert(cache);
assert(cache_stat);
- fn = efi_variable_path(EFI_VENDOR_LOADER, "LoaderEntryOneShot");
- if (!fn)
- return -ENOMEM;
-
/* stat() the EFI variable, to see if the mtime changed. If it did we need to cache again. */
- if (stat(fn, &new_stat) < 0)
+ if (stat(EFIVAR_PATH(EFI_LOADER_VARIABLE(LoaderEntryOneShot)), &new_stat) < 0)
return -errno;
if (stat_inode_unmodified(&new_stat, cache_stat))
return 0;
- r = efi_get_variable_string(EFI_VENDOR_LOADER, "LoaderEntryOneShot", &v);
+ r = efi_get_variable_string(EFI_LOADER_VARIABLE(LoaderEntryOneShot), &v);
if (r < 0)
return r;
return 0;
}
-bool efi_has_tpm2(void) {
- static int cache = -1;
-
- /* Returns whether the system has a TPM2 chip which is known to the EFI firmware. */
-
- if (cache < 0) {
-
- /* First, check if we are on an EFI boot at all. */
- if (!is_efi_boot())
- cache = false;
- else {
- /* Then, check if the ACPI table "TPM2" exists, which is the TPM2 event log table, see:
- * https://trustedcomputinggroup.org/wp-content/uploads/TCG_ACPIGeneralSpecification_v1.20_r8.pdf
- * This table exists whenever the firmware is hooked up to TPM2. */
- cache = access("/sys/firmware/acpi/tables/TPM2", F_OK) >= 0;
- if (!cache && errno != ENOENT)
- log_debug_errno(errno, "Unable to test whether /sys/firmware/acpi/tables/TPM2 exists, assuming it doesn't: %m");
- }
- }
-
- return cache;
-}
-
#endif
bool efi_loader_entry_name_valid(const char *s) {
-
if (!filename_is_valid(s)) /* 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;
-}
projects / thirdparty / systemd.git / blobdiff