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Merge pull request #22840 from poettering/efivars-tweaks

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util-lib: efi variable access refactorings
This commit is contained in:
Lennart Poettering 2022-03-24 18:39:46 +01:00 committed by GitHub
commit 3824ce0522
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GPG Key ID: 4AEE18F83AFDEB23
12 changed files with 688 additions and 646 deletions
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44
src/basic/efivars.c
View File

@ -142,7 +142,7 @@ int efi_get_variable(
return 0; return 0;
} }
int efi_get_variable_string(const char *variable, char **p) { int efi_get_variable_string(const char *variable, char **ret) {
_cleanup_free_ void *s = NULL; _cleanup_free_ void *s = NULL;
size_t ss = 0; size_t ss = 0;
int r; int r;
@ -156,7 +156,7 @@ int efi_get_variable_string(const char *variable, char **p) {
if (!x) if (!x)
return -ENOMEM; return -ENOMEM;
*p = x; *ret = x;
return 0; return 0;
} }
@ -310,9 +310,17 @@ static int read_flag(const char *variable) {
bool is_efi_secure_boot(void) { bool is_efi_secure_boot(void) {
static int cache = -1; static int cache = -1;
int r;
if (cache < 0) if (cache < 0) {
cache = read_flag(EFI_GLOBAL_VARIABLE(SecureBoot)); r = read_flag(EFI_GLOBAL_VARIABLE(SecureBoot));
if (r == -ENOENT)
cache = false;
else if (r < 0)
log_debug_errno(r, "Error reading SecureBoot EFI variable, assuming not in SecureBoot mode: %m");
else
cache = r;
}
return cache > 0; return cache > 0;
} }
@ -326,7 +334,8 @@ SecureBootMode efi_get_secure_boot_mode(void) {
int secure = read_flag(EFI_GLOBAL_VARIABLE(SecureBoot)); int secure = read_flag(EFI_GLOBAL_VARIABLE(SecureBoot));
if (secure < 0) { if (secure < 0) {
if (secure != -ENOENT) if (secure != -ENOENT)
log_debug_errno(secure, "Error reading SecureBoot EFI variable: %m"); log_debug_errno(secure, "Error reading SecureBoot EFI variable, assuming not in SecureBoot mode: %m");
return (cache = SECURE_BOOT_UNSUPPORTED); return (cache = SECURE_BOOT_UNSUPPORTED);
} }
@ -341,7 +350,7 @@ SecureBootMode efi_get_secure_boot_mode(void) {
return (cache = decode_secure_boot_mode(secure, audit > 0, deployed > 0, setup > 0)); return (cache = decode_secure_boot_mode(secure, audit > 0, deployed > 0, setup > 0));
} }
static int read_efi_options_variable(char **line) { static int read_efi_options_variable(char **ret) {
int r; int r;
/* In SecureBoot mode this is probably not what you want. As your cmdline is cryptographically signed /* In SecureBoot mode this is probably not what you want. As your cmdline is cryptographically signed
@ -361,7 +370,7 @@ static int read_efi_options_variable(char **line) {
return -EPERM; return -EPERM;
} }
r = efi_get_variable_string(EFI_SYSTEMD_VARIABLE(SystemdOptions), line); r = efi_get_variable_string(EFI_SYSTEMD_VARIABLE(SystemdOptions), ret);
if (r == -ENOENT) if (r == -ENOENT)
return -ENODATA; return -ENODATA;
return r; return r;
@ -379,13 +388,13 @@ int cache_efi_options_variable(void) {
WRITE_STRING_FILE_ATOMIC|WRITE_STRING_FILE_CREATE|WRITE_STRING_FILE_MKDIR_0755); WRITE_STRING_FILE_ATOMIC|WRITE_STRING_FILE_CREATE|WRITE_STRING_FILE_MKDIR_0755);
} }
int systemd_efi_options_variable(char **line) { int systemd_efi_options_variable(char **ret) {
const char *e; const char *e;
int r; int r;
/* Returns the contents of the variable for current boot from the cache. */ /* Returns the contents of the variable for current boot from the cache. */
assert(line); assert(ret);
/* For testing purposes it is sometimes useful to be able to override this */ /* For testing purposes it is sometimes useful to be able to override this */
e = secure_getenv("SYSTEMD_EFI_OPTIONS"); e = secure_getenv("SYSTEMD_EFI_OPTIONS");
@ -396,11 +405,11 @@ int systemd_efi_options_variable(char **line) {
if (!m) if (!m)
return -ENOMEM; return -ENOMEM;
*line = m; *ret = m;
return 0; return 0;
} }
r = read_one_line_file(EFIVAR_CACHE_PATH(EFI_SYSTEMD_VARIABLE(SystemdOptions)), line); r = read_one_line_file(EFIVAR_CACHE_PATH(EFI_SYSTEMD_VARIABLE(SystemdOptions)), ret);
if (r == -ENOENT) if (r == -ENOENT)
return -ENODATA; return -ENODATA;
return r; return r;
@ -410,7 +419,7 @@ static inline int compare_stat_mtime(const struct stat *a, const struct stat *b)
return CMP(timespec_load(&a->st_mtim), timespec_load(&b->st_mtim)); return CMP(timespec_load(&a->st_mtim), timespec_load(&b->st_mtim));
} }
int systemd_efi_options_efivarfs_if_newer(char **line) { int systemd_efi_options_efivarfs_if_newer(char **ret) {
struct stat a = {}, b; struct stat a = {}, b;
int r; int r;
@ -424,15 +433,14 @@ int systemd_efi_options_efivarfs_if_newer(char **line) {
log_debug("Variable SystemdOptions in evifarfs is newer than in cache."); log_debug("Variable SystemdOptions in evifarfs is newer than in cache.");
else { else {
log_debug("Variable SystemdOptions in cache is up to date."); log_debug("Variable SystemdOptions in cache is up to date.");
*line = NULL; *ret = NULL;
return 0; return 0;
} }
r = read_efi_options_variable(line); r = read_efi_options_variable(ret);
if (r < 0) if (r < 0)
log_warning_errno(r, "Failed to read SystemdOptions EFI variable: %m"); return log_debug_errno(r, "Failed to read SystemdOptions EFI variable: %m");
if (r == -ENOENT)
return -ENODATA; return 0;
return r;
} }
#endif #endif

17
src/basic/efivars.h
View File

@ -19,9 +19,10 @@
#define EFI_VENDOR_GLOBAL_STR SD_ID128_MAKE_UUID_STR(8b,e4,df,61,93,ca,11,d2,aa,0d,00,e0,98,03,2b,8c) #define EFI_VENDOR_GLOBAL_STR SD_ID128_MAKE_UUID_STR(8b,e4,df,61,93,ca,11,d2,aa,0d,00,e0,98,03,2b,8c)
#define EFI_VENDOR_SYSTEMD SD_ID128_MAKE(8c,f2,64,4b,4b,0b,42,8f,93,87,6d,87,60,50,dc,67) #define EFI_VENDOR_SYSTEMD SD_ID128_MAKE(8c,f2,64,4b,4b,0b,42,8f,93,87,6d,87,60,50,dc,67)
#define EFI_VENDOR_SYSTEMD_STR SD_ID128_MAKE_UUID_STR(8c,f2,64,4b,4b,0b,42,8f,93,87,6d,87,60,50,dc,67) #define EFI_VENDOR_SYSTEMD_STR SD_ID128_MAKE_UUID_STR(8c,f2,64,4b,4b,0b,42,8f,93,87,6d,87,60,50,dc,67)
#define EFI_VARIABLE_NON_VOLATILE 0x0000000000000001
#define EFI_VARIABLE_BOOTSERVICE_ACCESS 0x0000000000000002 #define EFI_VARIABLE_NON_VOLATILE UINT32_C(0x00000001)
#define EFI_VARIABLE_RUNTIME_ACCESS 0x0000000000000004 #define EFI_VARIABLE_BOOTSERVICE_ACCESS UINT32_C(0x00000002)
#define EFI_VARIABLE_RUNTIME_ACCESS UINT32_C(0x00000004)
/* Note that the <lowercaseuuid>-<varname> naming scheme is an efivarfs convention, i.e. part of the Linux /* Note that the <lowercaseuuid>-<varname> naming scheme is an efivarfs convention, i.e. part of the Linux
* API file system implementation for EFI. EFI itself processes UIDS in binary form. * API file system implementation for EFI. EFI itself processes UIDS in binary form.
@ -42,8 +43,8 @@
#if ENABLE_EFI #if ENABLE_EFI
int efi_get_variable(const char *variable, uint32_t *attribute, void **value, size_t *size); int efi_get_variable(const char *variable, uint32_t *attribute, void **ret_value, size_t *ret_size);
int efi_get_variable_string(const char *variable, char **p); int efi_get_variable_string(const char *variable, char **ret);
int efi_set_variable(const char *variable, const void *value, size_t size); int efi_set_variable(const char *variable, const void *value, size_t size);
int efi_set_variable_string(const char *variable, const char *p); int efi_set_variable_string(const char *variable, const char *p);
@ -52,8 +53,8 @@ bool is_efi_secure_boot(void);
SecureBootMode efi_get_secure_boot_mode(void); SecureBootMode efi_get_secure_boot_mode(void);
int cache_efi_options_variable(void); int cache_efi_options_variable(void);
int systemd_efi_options_variable(char **line); int systemd_efi_options_variable(char **ret);
int systemd_efi_options_efivarfs_if_newer(char **line); int systemd_efi_options_efivarfs_if_newer(char **ret);
#else #else
@ -61,7 +62,7 @@ static inline int efi_get_variable(const char *variable, uint32_t *attribute, vo
return -EOPNOTSUPP; return -EOPNOTSUPP;
} }
static inline int efi_get_variable_string(const char *variable, char **p) { static inline int efi_get_variable_string(const char *variable, char **ret) {
return -EOPNOTSUPP; return -EOPNOTSUPP;
} }

1
src/boot/bless-boot.c
View File

@ -5,6 +5,7 @@
#include "alloc-util.h" #include "alloc-util.h"
#include "bootspec.h" #include "bootspec.h"
#include "efi-api.h"
#include "efi-loader.h" #include "efi-loader.h"
#include "efivars.h" #include "efivars.h"
#include "fd-util.h" #include "fd-util.h"

1
src/boot/bootctl.c
View File

@ -17,6 +17,7 @@
#include "bootspec.h" #include "bootspec.h"
#include "copy.h" #include "copy.h"
#include "dirent-util.h" #include "dirent-util.h"
#include "efi-api.h"
#include "efi-loader.h" #include "efi-loader.h"
#include "efivars.h" #include "efivars.h"
#include "env-file.h" #include "env-file.h"

2
src/cryptsetup/cryptsetup.c
View File

@ -17,7 +17,7 @@
#include "cryptsetup-tpm2.h" #include "cryptsetup-tpm2.h"
#include "cryptsetup-util.h" #include "cryptsetup-util.h"
#include "device-util.h" #include "device-util.h"
#include "efi-loader.h" #include "efi-api.h"
#include "env-util.h" #include "env-util.h"
#include "escape.h" #include "escape.h"
#include "fileio.h" #include "fileio.h"

1
src/login/logind-dbus.c
View File

@ -20,6 +20,7 @@
#include "cgroup-util.h" #include "cgroup-util.h"
#include "device-util.h" #include "device-util.h"
#include "dirent-util.h" #include "dirent-util.h"
#include "efi-api.h"
#include "efi-loader.h" #include "efi-loader.h"
#include "efivars.h" #include "efivars.h"
#include "env-file.h" #include "env-file.h"

2
src/shared/condition.c
View File

@ -22,7 +22,7 @@
#include "cgroup-util.h" #include "cgroup-util.h"
#include "condition.h" #include "condition.h"
#include "cpu-set-util.h" #include "cpu-set-util.h"
#include "efi-loader.h" #include "efi-api.h"
#include "env-file.h" #include "env-file.h"
#include "env-util.h" #include "env-util.h"
#include "extract-word.h" #include "extract-word.h"

556
src/shared/efi-api.c Normal file
View File

@ -0,0 +1,556 @@
/* SPDX-License-Identifier: LGPL-2.1-or-later */
#include <unistd.h>
#include "alloc-util.h"
#include "dirent-util.h"
#include "efi-api.h"
#include "efivars.h"
#include "fd-util.h"
#include "sort-util.h"
#include "stat-util.h"
#include "stdio-util.h"
#include "utf8.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 UINT64_C(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_GLOBAL_VARIABLE(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;
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;
/* stat() the EFI variable, to see if the mtime changed. If it did we need to cache again. */
if (stat(EFIVAR_PATH(EFI_GLOBAL_VARIABLE(OsIndications)), &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_GLOBAL_VARIABLE(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_GLOBAL_VARIABLE(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 **ret_title,
sd_id128_t *ret_part_uuid,
char **ret_path,
bool *ret_active) {
char variable[STRLEN(EFI_GLOBAL_VARIABLE_STR("Boot")) + 4 + 1];
_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(variable, EFI_GLOBAL_VARIABLE_STR("Boot%04X"), id);
r = efi_get_variable(variable, 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 (ret_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 (ret_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 && ret_path) {
p = utf16_to_utf8(dpath->path, dpath->length-4);
if (!p)
return -ENOMEM;
efi_tilt_backslashes(p);
continue;
}
}
}
if (ret_title)
*ret_title = TAKE_PTR(s);
if (ret_part_uuid)
*ret_part_uuid = p_uuid;
if (ret_path)
*ret_path = TAKE_PTR(p);
if (ret_active)
*ret_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) {
for (uint16_t *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 variable[STRLEN(EFI_GLOBAL_VARIABLE_STR("Boot")) + 4 + 1];
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(variable, EFI_GLOBAL_VARIABLE_STR("Boot%04X"), id);
return efi_set_variable(variable, buf, size);
}
int efi_remove_boot_option(uint16_t id) {
char variable[STRLEN(EFI_GLOBAL_VARIABLE_STR("Boot")) + 4 + 1];
if (!is_efi_boot())
return -EOPNOTSUPP;
xsprintf(variable, EFI_GLOBAL_VARIABLE_STR("Boot%04X"), id);
return efi_set_variable(variable, NULL, 0);
}
int efi_get_boot_order(uint16_t **ret_order) {
_cleanup_free_ void *buf = NULL;
size_t l;
int r;
assert(ret_order);
if (!is_efi_boot())
return -EOPNOTSUPP;
r = efi_get_variable(EFI_GLOBAL_VARIABLE(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;
*ret_order = TAKE_PTR(buf);
return (int) (l / sizeof(uint16_t));
}
int efi_set_boot_order(const uint16_t *order, size_t n) {
if (!is_efi_boot())
return -EOPNOTSUPP;
return efi_set_variable(EFI_GLOBAL_VARIABLE(BootOrder), order, n * sizeof(uint16_t));
}
static int boot_id_hex(const char s[static 4]) {
int id = 0;
assert(s);
for (int 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 **ret_options) {
_cleanup_closedir_ DIR *dir = NULL;
_cleanup_free_ uint16_t *list = NULL;
int count = 0;
assert(ret_options);
if (!is_efi_boot())
return -EOPNOTSUPP;
dir = opendir(EFIVAR_PATH("."));
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, EFI_GLOBAL_VARIABLE_STR("")) != 0) /* generate variable suffix using macro */
continue;
id = boot_id_hex(de->d_name + 4);
if (id < 0)
continue;
if (!GREEDY_REALLOC(list, count + 1))
return -ENOMEM;
list[count++] = id;
}
typesafe_qsort(list, count, cmp_uint16);
*ret_options = TAKE_PTR(list);
return count;
}
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
char *efi_tilt_backslashes(char *s) {
for (char *p = s; *p; p++)
if (*p == '\\')
*p = '/';
return s;
}

68
src/shared/efi-api.h Normal file
View File

@ -0,0 +1,68 @@
/* SPDX-License-Identifier: LGPL-2.1-or-later */
#pragma once
#include "efivars-fundamental.h"
#include "efivars.h"
/* Various calls for interfacing with EFI variables from the official UEFI specs. */
#if ENABLE_EFI
int efi_reboot_to_firmware_supported(void);
int efi_get_reboot_to_firmware(void);
int efi_set_reboot_to_firmware(bool value);
int efi_get_boot_option(uint16_t nr, char **ret_title, sd_id128_t *ret_part_uuid, char **ret_path, bool *ret_active);
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);
int efi_remove_boot_option(uint16_t id);
int efi_get_boot_order(uint16_t **ret_order);
int efi_set_boot_order(const uint16_t *order, size_t n);
int efi_get_boot_options(uint16_t **ret_options);
bool efi_has_tpm2(void);
#else
static inline int efi_reboot_to_firmware_supported(void) {
return -EOPNOTSUPP;
}
static inline int efi_get_reboot_to_firmware(void) {
return -EOPNOTSUPP;
}
static inline int efi_set_reboot_to_firmware(bool value) {
return -EOPNOTSUPP;
}
static inline int efi_get_boot_option(uint16_t nr, char **ret_title, sd_id128_t *ret_part_uuid, char **ret_path, bool *ret_active) {
return -EOPNOTSUPP;
}
static inline 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) {
return -EOPNOTSUPP;
}
static inline int efi_remove_boot_option(uint16_t id) {
return -EOPNOTSUPP;
}
static inline int efi_get_boot_order(uint16_t **ret_order) {
return -EOPNOTSUPP;
}
static inline int efi_set_boot_order(const uint16_t *order, size_t n) {
return -EOPNOTSUPP;
}
static inline int efi_get_boot_options(uint16_t **ret_options) {
return -EOPNOTSUPP;
}
static inline bool efi_has_tpm2(void) {
return false;
}
#endif
char *efi_tilt_backslashes(char *s);

579
src/shared/efi-loader.c
View File

@ -1,537 +1,22 @@
/* SPDX-License-Identifier: LGPL-2.1-or-later */ /* SPDX-License-Identifier: LGPL-2.1-or-later */
#include <stdlib.h>
#include <sys/stat.h>
#include <unistd.h>
#include "alloc-util.h" #include "alloc-util.h"
#include "dirent-util.h"
#include "efi-loader.h" #include "efi-loader.h"
#include "efivars.h"
#include "fd-util.h"
#include "io-util.h"
#include "parse-util.h" #include "parse-util.h"
#include "sort-util.h" #include "path-util.h"
#include "stat-util.h" #include "stat-util.h"
#include "stdio-util.h" #include "strv.h"
#include "string-util.h"
#include "utf8.h" #include "utf8.h"
#include "virt.h"
#if ENABLE_EFI #if ENABLE_EFI
#define LOAD_OPTION_ACTIVE 0x00000001 static int read_usec(const char *variable, usec_t *ret) {
#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_GLOBAL_VARIABLE(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;
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;
/* stat() the EFI variable, to see if the mtime changed. If it did we need to cache again. */
if (stat(EFIVAR_PATH(EFI_GLOBAL_VARIABLE(OsIndications)), &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_GLOBAL_VARIABLE(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_GLOBAL_VARIABLE(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 variable[STRLEN(EFI_GLOBAL_VARIABLE_STR("Boot")) + 4 + 1];
_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(variable, EFI_GLOBAL_VARIABLE_STR("Boot%04X"), id);
r = efi_get_variable(variable, 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) {
for (uint16_t *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 variable[STRLEN(EFI_GLOBAL_VARIABLE_STR("Boot")) + 4 + 1];
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(variable, EFI_GLOBAL_VARIABLE_STR("Boot%04X"), id);
return efi_set_variable(variable, buf, size);
}
int efi_remove_boot_option(uint16_t id) {
char variable[STRLEN(EFI_GLOBAL_VARIABLE_STR("Boot")) + 4 + 1];
if (!is_efi_boot())
return -EOPNOTSUPP;
xsprintf(variable, EFI_GLOBAL_VARIABLE_STR("Boot%04X"), id);
return efi_set_variable(variable, 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_GLOBAL_VARIABLE(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_GLOBAL_VARIABLE(BootOrder), order, n * sizeof(uint16_t));
}
static int boot_id_hex(const char s[static 4]) {
int id = 0;
assert(s);
for (int 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;
int count = 0;
assert(options);
if (!is_efi_boot())
return -EOPNOTSUPP;
dir = opendir(EFIVAR_PATH("."));
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, EFI_GLOBAL_VARIABLE_STR("")) != 0) /* generate variable suffix using macro */
continue;
id = boot_id_hex(de->d_name + 4);
if (id < 0)
continue;
if (!GREEDY_REALLOC(list, count + 1))
return -ENOMEM;
list[count++] = id;
}
typesafe_qsort(list, count, cmp_uint16);
*options = TAKE_PTR(list);
return count;
}
static int read_usec(const char *variable, usec_t *u) {
_cleanup_free_ char *j = NULL; _cleanup_free_ char *j = NULL;
int r;
uint64_t x = 0; uint64_t x = 0;
int r;
assert(variable); assert(variable);
assert(u); assert(ret);
r = efi_get_variable_string(variable, &j); r = efi_get_variable_string(variable, &j);
if (r < 0) if (r < 0)
@ -541,16 +26,16 @@ static int read_usec(const char *variable, usec_t *u) {
if (r < 0) if (r < 0)
return r; return r;
*u = x; *ret = x;
return 0; 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; uint64_t x, y;
int r; int r;
assert(firmware); assert(ret_firmware);
assert(loader); assert(ret_loader);
if (!is_efi_boot()) if (!is_efi_boot())
return -EOPNOTSUPP; return -EOPNOTSUPP;
@ -568,16 +53,17 @@ int efi_loader_get_boot_usec(usec_t *firmware, usec_t *loader) {
"Bad LoaderTimeInitUSec=%"PRIu64", LoaderTimeExecUSec=%" PRIu64"; refusing.", "Bad LoaderTimeInitUSec=%"PRIu64", LoaderTimeExecUSec=%" PRIu64"; refusing.",
x, y); x, y);
*firmware = x; *ret_firmware = x;
*loader = y; *ret_loader = y;
return 0; 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; _cleanup_free_ char *p = NULL;
int r, parsed[16]; int r, parsed[16];
assert(ret);
if (!is_efi_boot()) if (!is_efi_boot())
return -EOPNOTSUPP; return -EOPNOTSUPP;
@ -592,9 +78,9 @@ int efi_loader_get_device_part_uuid(sd_id128_t *u) {
&parsed[12], &parsed[13], &parsed[14], &parsed[15]) != 16) &parsed[12], &parsed[13], &parsed[14], &parsed[15]) != 16)
return -EIO; return -EIO;
if (u) if (ret)
for (unsigned i = 0; i < ELEMENTSOF(parsed); i++) for (unsigned i = 0; i < ELEMENTSOF(parsed); i++)
u->bytes[i] = parsed[i]; ret->bytes[i] = parsed[i];
return 0; return 0;
} }
@ -657,6 +143,8 @@ int efi_loader_get_features(uint64_t *ret) {
size_t s; size_t s;
int r; int r;
assert(ret);
if (!is_efi_boot()) { if (!is_efi_boot()) {
*ret = 0; *ret = 0;
return 0; return 0;
@ -763,29 +251,6 @@ int efi_loader_update_entry_one_shot_cache(char **cache, struct stat *cache_stat
return 0; 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 #endif
bool efi_loader_entry_name_valid(const char *s) { bool efi_loader_entry_name_valid(const char *s) {
@ -794,11 +259,3 @@ bool efi_loader_entry_name_valid(const char *s) {
return in_charset(s, ALPHANUMERICAL "+-_."); return in_charset(s, ALPHANUMERICAL "+-_.");
} }
char *efi_tilt_backslashes(char *s) {
for (char *p = s; *p; p++)
if (*p == '\\')
*p = '/';
return s;
}

61
src/shared/efi-loader.h
View File

@ -6,21 +6,12 @@
#include "efivars-fundamental.h" #include "efivars-fundamental.h"
#include "efivars.h" #include "efivars.h"
/* Various calls that interface with EFI variables implementing https://systemd.io/BOOT_LOADER_INTERFACE */
#if ENABLE_EFI #if ENABLE_EFI
int efi_reboot_to_firmware_supported(void); int efi_loader_get_device_part_uuid(sd_id128_t *ret);
int efi_get_reboot_to_firmware(void); int efi_loader_get_boot_usec(usec_t *ret_firmware, usec_t *ret_loader);
int efi_set_reboot_to_firmware(bool value);
int efi_get_boot_option(uint16_t nr, char **title, sd_id128_t *part_uuid, char **path, bool *active);
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);
int efi_remove_boot_option(uint16_t id);
int efi_get_boot_order(uint16_t **order);
int efi_set_boot_order(uint16_t *order, size_t n);
int efi_get_boot_options(uint16_t **options);
int efi_loader_get_device_part_uuid(sd_id128_t *u);
int efi_loader_get_boot_usec(usec_t *firmware, usec_t *loader);
int efi_loader_get_entries(char ***ret); int efi_loader_get_entries(char ***ret);
@ -29,46 +20,8 @@ int efi_loader_get_features(uint64_t *ret);
int efi_loader_get_config_timeout_one_shot(usec_t *ret); int efi_loader_get_config_timeout_one_shot(usec_t *ret);
int efi_loader_update_entry_one_shot_cache(char **cache, struct stat *cache_stat); int efi_loader_update_entry_one_shot_cache(char **cache, struct stat *cache_stat);
bool efi_has_tpm2(void);
#else #else
static inline int efi_reboot_to_firmware_supported(void) {
return -EOPNOTSUPP;
}
static inline int efi_get_reboot_to_firmware(void) {
return -EOPNOTSUPP;
}
static inline int efi_set_reboot_to_firmware(bool value) {
return -EOPNOTSUPP;
}
static inline int efi_get_boot_option(uint16_t nr, char **title, sd_id128_t *part_uuid, char **path, bool *active) {
return -EOPNOTSUPP;
}
static inline 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) {
return -EOPNOTSUPP;
}
static inline int efi_remove_boot_option(uint16_t id) {
return -EOPNOTSUPP;
}
static inline int efi_get_boot_order(uint16_t **order) {
return -EOPNOTSUPP;
}
static inline int efi_set_boot_order(uint16_t *order, size_t n) {
return -EOPNOTSUPP;
}
static inline int efi_get_boot_options(uint16_t **options) {
return -EOPNOTSUPP;
}
static inline int efi_loader_get_device_part_uuid(sd_id128_t *u) { static inline int efi_loader_get_device_part_uuid(sd_id128_t *u) {
return -EOPNOTSUPP; return -EOPNOTSUPP;
} }
@ -93,12 +46,6 @@ static inline int efi_loader_update_entry_one_shot_cache(char **cache, struct st
return -EOPNOTSUPP; return -EOPNOTSUPP;
} }
static inline bool efi_has_tpm2(void) {
return false;
}
#endif #endif
bool efi_loader_entry_name_valid(const char *s); bool efi_loader_entry_name_valid(const char *s);
char *efi_tilt_backslashes(char *s);

2
src/shared/meson.build
View File

@ -105,6 +105,8 @@ shared_sources = files(
'dns-domain.h', 'dns-domain.h',
'dropin.c', 'dropin.c',
'dropin.h', 'dropin.h',
'efi-api.c',
'efi-api.h',
'efi-loader.c', 'efi-loader.c',
'efi-loader.h', 'efi-loader.h',
'elf-util.c', 'elf-util.c',