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Commit | Line | Data |
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53e1b683 | 1 | /* SPDX-License-Identifier: LGPL-2.1+ */ |
2e3d0692 | 2 | |
a8fbdf54 TA |
3 | #include <dirent.h> |
4 | #include <errno.h> | |
2e3d0692 | 5 | #include <fcntl.h> |
a8fbdf54 | 6 | #include <limits.h> |
2c3bf278 | 7 | #include <linux/fs.h> |
a8fbdf54 TA |
8 | #include <stdio.h> |
9 | #include <stdlib.h> | |
cf0fbc49 | 10 | #include <string.h> |
a8fbdf54 | 11 | #include <sys/stat.h> |
cf0fbc49 | 12 | #include <unistd.h> |
2e3d0692 | 13 | |
a8fbdf54 TA |
14 | #include "sd-id128.h" |
15 | ||
b5efdb8a | 16 | #include "alloc-util.h" |
2c3bf278 | 17 | #include "chattr-util.h" |
a0956174 | 18 | #include "dirent-util.h" |
3ffd4af2 LP |
19 | #include "efivars.h" |
20 | #include "fd-util.h" | |
c004493c | 21 | #include "io-util.h" |
a8fbdf54 | 22 | #include "macro.h" |
6bedfcbb | 23 | #include "parse-util.h" |
15a5e950 | 24 | #include "stdio-util.h" |
bd2865ca | 25 | #include "strv.h" |
a8fbdf54 | 26 | #include "time-util.h" |
2e3d0692 | 27 | #include "utf8.h" |
3ffd4af2 | 28 | #include "util.h" |
5bdf2243 | 29 | #include "virt.h" |
2e3d0692 | 30 | |
349cc4a5 | 31 | #if ENABLE_EFI |
b872e9a0 | 32 | |
0974a682 KS |
33 | #define LOAD_OPTION_ACTIVE 0x00000001 |
34 | #define MEDIA_DEVICE_PATH 0x04 | |
35 | #define MEDIA_HARDDRIVE_DP 0x01 | |
36 | #define MEDIA_FILEPATH_DP 0x04 | |
37 | #define SIGNATURE_TYPE_GUID 0x02 | |
38 | #define MBR_TYPE_EFI_PARTITION_TABLE_HEADER 0x02 | |
39 | #define END_DEVICE_PATH_TYPE 0x7f | |
40 | #define END_ENTIRE_DEVICE_PATH_SUBTYPE 0xff | |
5bdf2243 | 41 | #define EFI_OS_INDICATIONS_BOOT_TO_FW_UI 0x0000000000000001 |
0974a682 KS |
42 | |
43 | struct boot_option { | |
44 | uint32_t attr; | |
45 | uint16_t path_len; | |
46 | uint16_t title[]; | |
885fdebc | 47 | } _packed_; |
0974a682 KS |
48 | |
49 | struct drive_path { | |
50 | uint32_t part_nr; | |
51 | uint64_t part_start; | |
52 | uint64_t part_size; | |
53 | char signature[16]; | |
54 | uint8_t mbr_type; | |
55 | uint8_t signature_type; | |
885fdebc | 56 | } _packed_; |
0974a682 KS |
57 | |
58 | struct device_path { | |
59 | uint8_t type; | |
60 | uint8_t sub_type; | |
61 | uint16_t length; | |
62 | union { | |
63 | uint16_t path[0]; | |
64 | struct drive_path drive; | |
65 | }; | |
885fdebc | 66 | } _packed_; |
0974a682 | 67 | |
9cde64ff | 68 | bool is_efi_boot(void) { |
bb161cdc LP |
69 | if (detect_container() > 0) |
70 | return false; | |
71 | ||
72 | return access("/sys/firmware/efi/", F_OK) >= 0; | |
34e5a31e LP |
73 | } |
74 | ||
bc6f2e7c | 75 | static int read_flag(const char *varname) { |
b47d419c | 76 | _cleanup_free_ void *v = NULL; |
bc6f2e7c | 77 | uint8_t b; |
e22c567f LP |
78 | size_t s; |
79 | int r; | |
bc6f2e7c | 80 | |
337eed30 LP |
81 | if (!is_efi_boot()) /* If this is not an EFI boot, assume the queried flags are zero */ |
82 | return 0; | |
83 | ||
bc6f2e7c KS |
84 | r = efi_get_variable(EFI_VENDOR_GLOBAL, varname, NULL, &v, &s); |
85 | if (r < 0) | |
86 | return r; | |
87 | ||
b47d419c ZJS |
88 | if (s != 1) |
89 | return -EINVAL; | |
bc6f2e7c KS |
90 | |
91 | b = *(uint8_t *)v; | |
e78c250b | 92 | return !!b; |
bc6f2e7c KS |
93 | } |
94 | ||
9df49b33 TG |
95 | bool is_efi_secure_boot(void) { |
96 | return read_flag("SecureBoot") > 0; | |
bc6f2e7c KS |
97 | } |
98 | ||
9df49b33 TG |
99 | bool is_efi_secure_boot_setup_mode(void) { |
100 | return read_flag("SetupMode") > 0; | |
bc6f2e7c KS |
101 | } |
102 | ||
5bdf2243 | 103 | int efi_reboot_to_firmware_supported(void) { |
5bdf2243 | 104 | _cleanup_free_ void *v = NULL; |
e22c567f LP |
105 | uint64_t b; |
106 | size_t s; | |
107 | int r; | |
5bdf2243 | 108 | |
bb161cdc | 109 | if (!is_efi_boot()) |
5bdf2243 JJ |
110 | return -EOPNOTSUPP; |
111 | ||
112 | r = efi_get_variable(EFI_VENDOR_GLOBAL, "OsIndicationsSupported", NULL, &v, &s); | |
846ab104 LP |
113 | if (r == -ENOENT) /* variable doesn't exist? it's not supported then */ |
114 | return -EOPNOTSUPP; | |
5bdf2243 JJ |
115 | if (r < 0) |
116 | return r; | |
e22c567f | 117 | if (s != sizeof(uint64_t)) |
5bdf2243 JJ |
118 | return -EINVAL; |
119 | ||
e22c567f LP |
120 | b = *(uint64_t*) v; |
121 | if (!(b & EFI_OS_INDICATIONS_BOOT_TO_FW_UI)) | |
122 | return -EOPNOTSUPP; /* bit unset? it's not supported then */ | |
123 | ||
124 | return 0; | |
5bdf2243 JJ |
125 | } |
126 | ||
127 | static int get_os_indications(uint64_t *os_indication) { | |
5bdf2243 | 128 | _cleanup_free_ void *v = NULL; |
e22c567f LP |
129 | size_t s; |
130 | int r; | |
5bdf2243 | 131 | |
e78c250b | 132 | /* Let's verify general support first */ |
5bdf2243 JJ |
133 | r = efi_reboot_to_firmware_supported(); |
134 | if (r < 0) | |
135 | return r; | |
136 | ||
137 | r = efi_get_variable(EFI_VENDOR_GLOBAL, "OsIndications", NULL, &v, &s); | |
6b62bbbc | 138 | if (r == -ENOENT) { |
e78c250b LP |
139 | /* Some firmware implementations that do support OsIndications and report that with |
140 | * OsIndicationsSupported will remove the OsIndications variable when it is unset. Let's pretend it's 0 | |
141 | * then, to hide this implementation detail. Note that this call will return -ENOENT then only if the | |
142 | * support for OsIndications is missing entirely, as determined by efi_reboot_to_firmware_supported() | |
143 | * above. */ | |
6b62bbbc LP |
144 | *os_indication = 0; |
145 | return 0; | |
146 | } else if (r < 0) | |
5bdf2243 JJ |
147 | return r; |
148 | else if (s != sizeof(uint64_t)) | |
149 | return -EINVAL; | |
150 | ||
151 | *os_indication = *(uint64_t *)v; | |
152 | return 0; | |
153 | } | |
154 | ||
155 | int efi_get_reboot_to_firmware(void) { | |
156 | int r; | |
157 | uint64_t b; | |
158 | ||
159 | r = get_os_indications(&b); | |
160 | if (r < 0) | |
161 | return r; | |
162 | ||
163 | return !!(b & EFI_OS_INDICATIONS_BOOT_TO_FW_UI); | |
164 | } | |
165 | ||
166 | int efi_set_reboot_to_firmware(bool value) { | |
167 | int r; | |
168 | uint64_t b, b_new; | |
169 | ||
170 | r = get_os_indications(&b); | |
171 | if (r < 0) | |
172 | return r; | |
173 | ||
174 | if (value) | |
175 | b_new = b | EFI_OS_INDICATIONS_BOOT_TO_FW_UI; | |
176 | else | |
177 | b_new = b & ~EFI_OS_INDICATIONS_BOOT_TO_FW_UI; | |
178 | ||
179 | /* Avoid writing to efi vars store if we can due to firmware bugs. */ | |
180 | if (b != b_new) | |
181 | return efi_set_variable(EFI_VENDOR_GLOBAL, "OsIndications", &b_new, sizeof(uint64_t)); | |
182 | ||
183 | return 0; | |
184 | } | |
185 | ||
9cde64ff LP |
186 | int efi_get_variable( |
187 | sd_id128_t vendor, | |
188 | const char *name, | |
189 | uint32_t *attribute, | |
190 | void **value, | |
191 | size_t *size) { | |
192 | ||
2e3d0692 LP |
193 | _cleanup_close_ int fd = -1; |
194 | _cleanup_free_ char *p = NULL; | |
195 | uint32_t a; | |
196 | ssize_t n; | |
197 | struct stat st; | |
ad7bcf52 | 198 | _cleanup_free_ void *buf = NULL; |
2e3d0692 LP |
199 | |
200 | assert(name); | |
201 | assert(value); | |
202 | assert(size); | |
203 | ||
204 | if (asprintf(&p, | |
205 | "/sys/firmware/efi/efivars/%s-%02x%02x%02x%02x-%02x%02x-%02x%02x-%02x%02x-%02x%02x%02x%02x%02x%02x", | |
206 | name, SD_ID128_FORMAT_VAL(vendor)) < 0) | |
207 | return -ENOMEM; | |
208 | ||
209 | fd = open(p, O_RDONLY|O_NOCTTY|O_CLOEXEC); | |
210 | if (fd < 0) | |
211 | return -errno; | |
212 | ||
213 | if (fstat(fd, &st) < 0) | |
214 | return -errno; | |
215 | if (st.st_size < 4) | |
216 | return -EIO; | |
217 | if (st.st_size > 4*1024*1024 + 4) | |
218 | return -E2BIG; | |
219 | ||
220 | n = read(fd, &a, sizeof(a)); | |
221 | if (n < 0) | |
9cde64ff | 222 | return -errno; |
2e3d0692 LP |
223 | if (n != sizeof(a)) |
224 | return -EIO; | |
225 | ||
0797f232 ZJS |
226 | buf = malloc(st.st_size - 4 + 2); |
227 | if (!buf) | |
2e3d0692 LP |
228 | return -ENOMEM; |
229 | ||
0797f232 ZJS |
230 | n = read(fd, buf, (size_t) st.st_size - 4); |
231 | if (n < 0) | |
742af54a | 232 | return -errno; |
0797f232 | 233 | if (n != (ssize_t) st.st_size - 4) |
2e3d0692 | 234 | return -EIO; |
2e3d0692 LP |
235 | |
236 | /* Always NUL terminate (2 bytes, to protect UTF-16) */ | |
0797f232 ZJS |
237 | ((char*) buf)[st.st_size - 4] = 0; |
238 | ((char*) buf)[st.st_size - 4 + 1] = 0; | |
2e3d0692 | 239 | |
ae2a15bc | 240 | *value = TAKE_PTR(buf); |
ff47c895 | 241 | *size = (size_t) st.st_size - 4; |
2e3d0692 LP |
242 | |
243 | if (attribute) | |
244 | *attribute = a; | |
245 | ||
246 | return 0; | |
247 | } | |
248 | ||
0974a682 KS |
249 | int efi_set_variable( |
250 | sd_id128_t vendor, | |
251 | const char *name, | |
252 | const void *value, | |
253 | size_t size) { | |
254 | ||
255 | struct var { | |
256 | uint32_t attr; | |
257 | char buf[]; | |
b7749eb5 ZJS |
258 | } _packed_ * _cleanup_free_ buf = NULL; |
259 | _cleanup_free_ char *p = NULL; | |
260 | _cleanup_close_ int fd = -1; | |
2c3bf278 LP |
261 | bool saved_flags_valid = false; |
262 | unsigned saved_flags; | |
263 | int r; | |
0974a682 KS |
264 | |
265 | assert(name); | |
e1e26566 | 266 | assert(value || size == 0); |
0974a682 KS |
267 | |
268 | if (asprintf(&p, | |
269 | "/sys/firmware/efi/efivars/%s-%02x%02x%02x%02x-%02x%02x-%02x%02x-%02x%02x-%02x%02x%02x%02x%02x%02x", | |
270 | name, SD_ID128_FORMAT_VAL(vendor)) < 0) | |
271 | return -ENOMEM; | |
272 | ||
2c3bf278 LP |
273 | /* Newer efivarfs protects variables that are not in a whitelist with FS_IMMUTABLE_FL by default, to protect |
274 | * them for accidental removal and modification. We are not changing these variables accidentally however, | |
275 | * hence let's unset the bit first. */ | |
276 | ||
277 | r = chattr_path(p, 0, FS_IMMUTABLE_FL, &saved_flags); | |
278 | if (r < 0 && r != -ENOENT) | |
279 | log_debug_errno(r, "Failed to drop FS_IMMUTABLE_FL flag from '%s', ignoring: %m", p); | |
280 | ||
281 | saved_flags_valid = r >= 0; | |
282 | ||
0974a682 | 283 | if (size == 0) { |
2c3bf278 LP |
284 | if (unlink(p) < 0) { |
285 | r = -errno; | |
286 | goto finish; | |
287 | } | |
288 | ||
b7749eb5 | 289 | return 0; |
0974a682 KS |
290 | } |
291 | ||
292 | fd = open(p, O_WRONLY|O_CREAT|O_NOCTTY|O_CLOEXEC, 0644); | |
2c3bf278 LP |
293 | if (fd < 0) { |
294 | r = -errno; | |
295 | goto finish; | |
296 | } | |
0974a682 KS |
297 | |
298 | buf = malloc(sizeof(uint32_t) + size); | |
2c3bf278 LP |
299 | if (!buf) { |
300 | r = -ENOMEM; | |
301 | goto finish; | |
302 | } | |
0974a682 KS |
303 | |
304 | buf->attr = EFI_VARIABLE_NON_VOLATILE|EFI_VARIABLE_BOOTSERVICE_ACCESS|EFI_VARIABLE_RUNTIME_ACCESS; | |
305 | memcpy(buf->buf, value, size); | |
306 | ||
2c3bf278 LP |
307 | r = loop_write(fd, buf, sizeof(uint32_t) + size, false); |
308 | if (r < 0) | |
309 | goto finish; | |
310 | ||
311 | r = 0; | |
312 | ||
313 | finish: | |
314 | if (saved_flags_valid) { | |
315 | int q; | |
316 | ||
317 | /* Restore the original flags field, just in case */ | |
318 | if (fd < 0) | |
319 | q = chattr_path(p, saved_flags, FS_IMMUTABLE_FL, NULL); | |
320 | else | |
321 | q = chattr_fd(fd, saved_flags, FS_IMMUTABLE_FL, NULL); | |
322 | if (q < 0) | |
323 | log_debug_errno(q, "Failed to restore FS_IMMUTABLE_FL on '%s', ignoring: %m", p); | |
324 | } | |
325 | ||
326 | return r; | |
0974a682 KS |
327 | } |
328 | ||
9cde64ff | 329 | int efi_get_variable_string(sd_id128_t vendor, const char *name, char **p) { |
7b4d7cc0 | 330 | _cleanup_free_ void *s = NULL; |
39883f62 | 331 | size_t ss = 0; |
9cde64ff LP |
332 | int r; |
333 | char *x; | |
7b4d7cc0 | 334 | |
9cde64ff LP |
335 | r = efi_get_variable(vendor, name, NULL, &s, &ss); |
336 | if (r < 0) | |
337 | return r; | |
338 | ||
339 | x = utf16_to_utf8(s, ss); | |
340 | if (!x) | |
341 | return -ENOMEM; | |
342 | ||
343 | *p = x; | |
344 | return 0; | |
7b4d7cc0 KS |
345 | } |
346 | ||
347 | static size_t utf16_size(const uint16_t *s) { | |
348 | size_t l = 0; | |
349 | ||
350 | while (s[l] > 0) | |
351 | l++; | |
9cde64ff | 352 | |
7b4d7cc0 KS |
353 | return (l+1) * sizeof(uint16_t); |
354 | } | |
355 | ||
356 | static void efi_guid_to_id128(const void *guid, sd_id128_t *id128) { | |
357 | struct uuid { | |
358 | uint32_t u1; | |
359 | uint16_t u2; | |
360 | uint16_t u3; | |
361 | uint8_t u4[8]; | |
362 | } _packed_; | |
363 | const struct uuid *uuid = guid; | |
364 | ||
365 | id128->bytes[0] = (uuid->u1 >> 24) & 0xff; | |
366 | id128->bytes[1] = (uuid->u1 >> 16) & 0xff; | |
367 | id128->bytes[2] = (uuid->u1 >> 8) & 0xff; | |
368 | id128->bytes[3] = (uuid->u1) & 0xff; | |
369 | id128->bytes[4] = (uuid->u2 >> 8) & 0xff; | |
370 | id128->bytes[5] = (uuid->u2) & 0xff; | |
371 | id128->bytes[6] = (uuid->u3 >> 8) & 0xff; | |
372 | id128->bytes[7] = (uuid->u3) & 0xff; | |
373 | memcpy(&id128->bytes[8], uuid->u4, sizeof(uuid->u4)); | |
374 | } | |
375 | ||
9cde64ff LP |
376 | int efi_get_boot_option( |
377 | uint16_t id, | |
378 | char **title, | |
379 | sd_id128_t *part_uuid, | |
0974a682 KS |
380 | char **path, |
381 | bool *active) { | |
7b4d7cc0 | 382 | |
9cde64ff LP |
383 | char boot_id[9]; |
384 | _cleanup_free_ uint8_t *buf = NULL; | |
7b4d7cc0 KS |
385 | size_t l; |
386 | struct boot_option *header; | |
387 | size_t title_size; | |
b7749eb5 | 388 | _cleanup_free_ char *s = NULL, *p = NULL; |
7b4d7cc0 | 389 | sd_id128_t p_uuid = SD_ID128_NULL; |
a8436474 | 390 | int r; |
7b4d7cc0 | 391 | |
337eed30 LP |
392 | if (!is_efi_boot()) |
393 | return -EOPNOTSUPP; | |
394 | ||
b7749eb5 | 395 | xsprintf(boot_id, "Boot%04X", id); |
a8436474 ZJS |
396 | r = efi_get_variable(EFI_VENDOR_GLOBAL, boot_id, NULL, (void **)&buf, &l); |
397 | if (r < 0) | |
398 | return r; | |
7b4d7cc0 KS |
399 | if (l < sizeof(struct boot_option)) |
400 | return -ENOENT; | |
401 | ||
402 | header = (struct boot_option *)buf; | |
403 | title_size = utf16_size(header->title); | |
404 | if (title_size > l - offsetof(struct boot_option, title)) | |
405 | return -EINVAL; | |
406 | ||
5483a186 ZJS |
407 | if (title) { |
408 | s = utf16_to_utf8(header->title, title_size); | |
b7749eb5 ZJS |
409 | if (!s) |
410 | return -ENOMEM; | |
7b4d7cc0 KS |
411 | } |
412 | ||
413 | if (header->path_len > 0) { | |
9cde64ff | 414 | uint8_t *dbuf; |
e7e36b90 DT |
415 | size_t dnext, doff; |
416 | ||
417 | doff = offsetof(struct boot_option, title) + title_size; | |
418 | dbuf = buf + doff; | |
419 | if (header->path_len > l - doff) | |
420 | return -EINVAL; | |
7b4d7cc0 | 421 | |
7b4d7cc0 KS |
422 | dnext = 0; |
423 | while (dnext < header->path_len) { | |
424 | struct device_path *dpath; | |
425 | ||
426 | dpath = (struct device_path *)(dbuf + dnext); | |
427 | if (dpath->length < 4) | |
428 | break; | |
429 | ||
430 | /* Type 0x7F – End of Hardware Device Path, Sub-Type 0xFF – End Entire Device Path */ | |
0974a682 | 431 | if (dpath->type == END_DEVICE_PATH_TYPE && dpath->sub_type == END_ENTIRE_DEVICE_PATH_SUBTYPE) |
7b4d7cc0 KS |
432 | break; |
433 | ||
434 | dnext += dpath->length; | |
435 | ||
436 | /* Type 0x04 – Media Device Path */ | |
0974a682 | 437 | if (dpath->type != MEDIA_DEVICE_PATH) |
7b4d7cc0 KS |
438 | continue; |
439 | ||
440 | /* Sub-Type 1 – Hard Drive */ | |
0974a682 | 441 | if (dpath->sub_type == MEDIA_HARDDRIVE_DP) { |
7b4d7cc0 | 442 | /* 0x02 – GUID Partition Table */ |
0974a682 | 443 | if (dpath->drive.mbr_type != MBR_TYPE_EFI_PARTITION_TABLE_HEADER) |
7b4d7cc0 KS |
444 | continue; |
445 | ||
446 | /* 0x02 – GUID signature */ | |
0974a682 | 447 | if (dpath->drive.signature_type != SIGNATURE_TYPE_GUID) |
7b4d7cc0 KS |
448 | continue; |
449 | ||
5483a186 ZJS |
450 | if (part_uuid) |
451 | efi_guid_to_id128(dpath->drive.signature, &p_uuid); | |
7b4d7cc0 KS |
452 | continue; |
453 | } | |
454 | ||
455 | /* Sub-Type 4 – File Path */ | |
0974a682 | 456 | if (dpath->sub_type == MEDIA_FILEPATH_DP && !p && path) { |
7b4d7cc0 | 457 | p = utf16_to_utf8(dpath->path, dpath->length-4); |
0974a682 | 458 | efi_tilt_backslashes(p); |
7b4d7cc0 KS |
459 | continue; |
460 | } | |
461 | } | |
462 | } | |
463 | ||
1cc6c93a YW |
464 | if (title) |
465 | *title = TAKE_PTR(s); | |
7b4d7cc0 KS |
466 | if (part_uuid) |
467 | *part_uuid = p_uuid; | |
1cc6c93a YW |
468 | if (path) |
469 | *path = TAKE_PTR(p); | |
0974a682 | 470 | if (active) |
0aa3b783 | 471 | *active = !!(header->attr & LOAD_OPTION_ACTIVE); |
9cde64ff | 472 | |
7b4d7cc0 | 473 | return 0; |
7b4d7cc0 KS |
474 | } |
475 | ||
0974a682 KS |
476 | static void to_utf16(uint16_t *dest, const char *src) { |
477 | int i; | |
478 | ||
479 | for (i = 0; src[i] != '\0'; i++) | |
480 | dest[i] = src[i]; | |
481 | dest[i] = '\0'; | |
482 | } | |
483 | ||
484 | struct guid { | |
485 | uint32_t u1; | |
486 | uint16_t u2; | |
487 | uint16_t u3; | |
488 | uint8_t u4[8]; | |
885fdebc | 489 | } _packed_; |
0974a682 KS |
490 | |
491 | static void id128_to_efi_guid(sd_id128_t id, void *guid) { | |
492 | struct guid *uuid = guid; | |
493 | ||
494 | uuid->u1 = id.bytes[0] << 24 | id.bytes[1] << 16 | id.bytes[2] << 8 | id.bytes[3]; | |
495 | uuid->u2 = id.bytes[4] << 8 | id.bytes[5]; | |
496 | uuid->u3 = id.bytes[6] << 8 | id.bytes[7]; | |
497 | memcpy(uuid->u4, id.bytes+8, sizeof(uuid->u4)); | |
498 | } | |
499 | ||
500 | static uint16_t *tilt_slashes(uint16_t *s) { | |
501 | uint16_t *p; | |
502 | ||
503 | for (p = s; *p; p++) | |
504 | if (*p == '/') | |
505 | *p = '\\'; | |
506 | ||
507 | return s; | |
508 | } | |
509 | ||
337eed30 LP |
510 | int efi_add_boot_option( |
511 | uint16_t id, | |
512 | const char *title, | |
513 | uint32_t part, | |
514 | uint64_t pstart, | |
515 | uint64_t psize, | |
516 | sd_id128_t part_uuid, | |
517 | const char *path) { | |
518 | ||
519 | size_t size, title_len, path_len; | |
520 | _cleanup_free_ char *buf = NULL; | |
0974a682 KS |
521 | struct boot_option *option; |
522 | struct device_path *devicep; | |
337eed30 LP |
523 | char boot_id[9]; |
524 | ||
525 | if (!is_efi_boot()) | |
526 | return -EOPNOTSUPP; | |
0974a682 KS |
527 | |
528 | title_len = (strlen(title)+1) * 2; | |
529 | path_len = (strlen(path)+1) * 2; | |
530 | ||
e78c250b LP |
531 | buf = malloc0(sizeof(struct boot_option) + title_len + |
532 | sizeof(struct drive_path) + | |
533 | sizeof(struct device_path) + path_len); | |
b7749eb5 ZJS |
534 | if (!buf) |
535 | return -ENOMEM; | |
0974a682 KS |
536 | |
537 | /* header */ | |
538 | option = (struct boot_option *)buf; | |
539 | option->attr = LOAD_OPTION_ACTIVE; | |
540 | option->path_len = offsetof(struct device_path, drive) + sizeof(struct drive_path) + | |
541 | offsetof(struct device_path, path) + path_len + | |
542 | offsetof(struct device_path, path); | |
543 | to_utf16(option->title, title); | |
544 | size = offsetof(struct boot_option, title) + title_len; | |
545 | ||
546 | /* partition info */ | |
547 | devicep = (struct device_path *)(buf + size); | |
548 | devicep->type = MEDIA_DEVICE_PATH; | |
549 | devicep->sub_type = MEDIA_HARDDRIVE_DP; | |
550 | devicep->length = offsetof(struct device_path, drive) + sizeof(struct drive_path); | |
551 | devicep->drive.part_nr = part; | |
552 | devicep->drive.part_start = pstart; | |
920b52e4 | 553 | devicep->drive.part_size = psize; |
0974a682 KS |
554 | devicep->drive.signature_type = SIGNATURE_TYPE_GUID; |
555 | devicep->drive.mbr_type = MBR_TYPE_EFI_PARTITION_TABLE_HEADER; | |
556 | id128_to_efi_guid(part_uuid, devicep->drive.signature); | |
557 | size += devicep->length; | |
558 | ||
559 | /* path to loader */ | |
560 | devicep = (struct device_path *)(buf + size); | |
561 | devicep->type = MEDIA_DEVICE_PATH; | |
562 | devicep->sub_type = MEDIA_FILEPATH_DP; | |
563 | devicep->length = offsetof(struct device_path, path) + path_len; | |
564 | to_utf16(devicep->path, path); | |
565 | tilt_slashes(devicep->path); | |
566 | size += devicep->length; | |
567 | ||
568 | /* end of path */ | |
569 | devicep = (struct device_path *)(buf + size); | |
570 | devicep->type = END_DEVICE_PATH_TYPE; | |
571 | devicep->sub_type = END_ENTIRE_DEVICE_PATH_SUBTYPE; | |
572 | devicep->length = offsetof(struct device_path, path); | |
573 | size += devicep->length; | |
574 | ||
b7749eb5 ZJS |
575 | xsprintf(boot_id, "Boot%04X", id); |
576 | return efi_set_variable(EFI_VENDOR_GLOBAL, boot_id, buf, size); | |
0974a682 KS |
577 | } |
578 | ||
579 | int efi_remove_boot_option(uint16_t id) { | |
580 | char boot_id[9]; | |
581 | ||
337eed30 LP |
582 | if (!is_efi_boot()) |
583 | return -EOPNOTSUPP; | |
584 | ||
b7749eb5 | 585 | xsprintf(boot_id, "Boot%04X", id); |
0974a682 KS |
586 | return efi_set_variable(EFI_VENDOR_GLOBAL, boot_id, NULL, 0); |
587 | } | |
588 | ||
9cde64ff | 589 | int efi_get_boot_order(uint16_t **order) { |
0797f232 | 590 | _cleanup_free_ void *buf = NULL; |
7b4d7cc0 | 591 | size_t l; |
9cde64ff | 592 | int r; |
7b4d7cc0 | 593 | |
337eed30 LP |
594 | if (!is_efi_boot()) |
595 | return -EOPNOTSUPP; | |
596 | ||
9cde64ff LP |
597 | r = efi_get_variable(EFI_VENDOR_GLOBAL, "BootOrder", NULL, &buf, &l); |
598 | if (r < 0) | |
599 | return r; | |
7b4d7cc0 | 600 | |
0797f232 | 601 | if (l <= 0) |
7b4d7cc0 | 602 | return -ENOENT; |
7b4d7cc0 | 603 | |
0797f232 ZJS |
604 | if (l % sizeof(uint16_t) > 0 || |
605 | l / sizeof(uint16_t) > INT_MAX) | |
7b4d7cc0 | 606 | return -EINVAL; |
7b4d7cc0 | 607 | |
ae2a15bc | 608 | *order = TAKE_PTR(buf); |
9cde64ff LP |
609 | return (int) (l / sizeof(uint16_t)); |
610 | } | |
611 | ||
0974a682 | 612 | int efi_set_boot_order(uint16_t *order, size_t n) { |
337eed30 LP |
613 | |
614 | if (!is_efi_boot()) | |
615 | return -EOPNOTSUPP; | |
616 | ||
0974a682 KS |
617 | return efi_set_variable(EFI_VENDOR_GLOBAL, "BootOrder", order, n * sizeof(uint16_t)); |
618 | } | |
619 | ||
4d34c495 | 620 | static int boot_id_hex(const char s[4]) { |
e78c250b | 621 | int id = 0, i; |
4d34c495 KS |
622 | |
623 | for (i = 0; i < 4; i++) | |
624 | if (s[i] >= '0' && s[i] <= '9') | |
625 | id |= (s[i] - '0') << (3 - i) * 4; | |
626 | else if (s[i] >= 'A' && s[i] <= 'F') | |
627 | id |= (s[i] - 'A' + 10) << (3 - i) * 4; | |
628 | else | |
7e8185ef | 629 | return -EINVAL; |
4d34c495 KS |
630 | |
631 | return id; | |
632 | } | |
633 | ||
93bab288 YW |
634 | static int cmp_uint16(const uint16_t *a, const uint16_t *b) { |
635 | return CMP(*a, *b); | |
9db11a99 LP |
636 | } |
637 | ||
9cde64ff LP |
638 | int efi_get_boot_options(uint16_t **options) { |
639 | _cleanup_closedir_ DIR *dir = NULL; | |
b7749eb5 | 640 | _cleanup_free_ uint16_t *list = NULL; |
e78c250b | 641 | struct dirent *de; |
7432b24b | 642 | size_t alloc = 0; |
b7749eb5 | 643 | int count = 0; |
9cde64ff LP |
644 | |
645 | assert(options); | |
646 | ||
337eed30 LP |
647 | if (!is_efi_boot()) |
648 | return -EOPNOTSUPP; | |
649 | ||
9cde64ff LP |
650 | dir = opendir("/sys/firmware/efi/efivars/"); |
651 | if (!dir) | |
652 | return -errno; | |
653 | ||
b7749eb5 | 654 | FOREACH_DIRENT(de, dir, return -errno) { |
4d34c495 | 655 | int id; |
9cde64ff LP |
656 | |
657 | if (strncmp(de->d_name, "Boot", 4) != 0) | |
658 | continue; | |
659 | ||
4d34c495 | 660 | if (strlen(de->d_name) != 45) |
9cde64ff LP |
661 | continue; |
662 | ||
663 | if (strcmp(de->d_name + 8, "-8be4df61-93ca-11d2-aa0d-00e098032b8c") != 0) | |
664 | continue; | |
665 | ||
4d34c495 KS |
666 | id = boot_id_hex(de->d_name + 4); |
667 | if (id < 0) | |
9cde64ff LP |
668 | continue; |
669 | ||
7432b24b | 670 | if (!GREEDY_REALLOC(list, alloc, count + 1)) |
b7749eb5 | 671 | return -ENOMEM; |
9cde64ff | 672 | |
7432b24b | 673 | list[count++] = id; |
9cde64ff LP |
674 | } |
675 | ||
93bab288 | 676 | typesafe_qsort(list, count, cmp_uint16); |
9db11a99 | 677 | |
1cc6c93a YW |
678 | *options = TAKE_PTR(list); |
679 | ||
9cde64ff | 680 | return count; |
7b4d7cc0 KS |
681 | } |
682 | ||
5dbe9f53 | 683 | static int read_usec(sd_id128_t vendor, const char *name, usec_t *u) { |
2e3d0692 | 684 | _cleanup_free_ char *j = NULL; |
2e3d0692 | 685 | int r; |
39883f62 | 686 | uint64_t x = 0; |
2e3d0692 LP |
687 | |
688 | assert(name); | |
689 | assert(u); | |
690 | ||
61cc634b | 691 | r = efi_get_variable_string(EFI_VENDOR_LOADER, name, &j); |
2e3d0692 LP |
692 | if (r < 0) |
693 | return r; | |
694 | ||
2e3d0692 LP |
695 | r = safe_atou64(j, &x); |
696 | if (r < 0) | |
697 | return r; | |
698 | ||
5dbe9f53 | 699 | *u = x; |
2e3d0692 LP |
700 | return 0; |
701 | } | |
702 | ||
c51d84dc | 703 | int efi_loader_get_boot_usec(usec_t *firmware, usec_t *loader) { |
2e3d0692 LP |
704 | uint64_t x, y; |
705 | int r; | |
2e3d0692 LP |
706 | |
707 | assert(firmware); | |
708 | assert(loader); | |
709 | ||
337eed30 LP |
710 | if (!is_efi_boot()) |
711 | return -EOPNOTSUPP; | |
712 | ||
e9cea16d | 713 | r = read_usec(EFI_VENDOR_LOADER, "LoaderTimeInitUSec", &x); |
2e3d0692 LP |
714 | if (r < 0) |
715 | return r; | |
716 | ||
e9cea16d | 717 | r = read_usec(EFI_VENDOR_LOADER, "LoaderTimeExecUSec", &y); |
2e3d0692 LP |
718 | if (r < 0) |
719 | return r; | |
720 | ||
721 | if (y == 0 || y < x) | |
722 | return -EIO; | |
723 | ||
724 | if (y > USEC_PER_HOUR) | |
725 | return -EIO; | |
726 | ||
727 | *firmware = x; | |
728 | *loader = y; | |
729 | ||
730 | return 0; | |
731 | } | |
732 | ||
c51d84dc | 733 | int efi_loader_get_device_part_uuid(sd_id128_t *u) { |
f4ce2b3e | 734 | _cleanup_free_ char *p = NULL; |
f4ce2b3e | 735 | int r, parsed[16]; |
f4ce2b3e | 736 | |
337eed30 LP |
737 | if (!is_efi_boot()) |
738 | return -EOPNOTSUPP; | |
739 | ||
61cc634b | 740 | r = efi_get_variable_string(EFI_VENDOR_LOADER, "LoaderDevicePartUUID", &p); |
f4ce2b3e LP |
741 | if (r < 0) |
742 | return r; | |
743 | ||
f4ce2b3e LP |
744 | if (sscanf(p, "%02x%02x%02x%02x-%02x%02x-%02x%02x-%02x%02x-%02x%02x%02x%02x%02x%02x", |
745 | &parsed[0], &parsed[1], &parsed[2], &parsed[3], | |
746 | &parsed[4], &parsed[5], &parsed[6], &parsed[7], | |
747 | &parsed[8], &parsed[9], &parsed[10], &parsed[11], | |
748 | &parsed[12], &parsed[13], &parsed[14], &parsed[15]) != 16) | |
749 | return -EIO; | |
750 | ||
73b80ec2 LP |
751 | if (u) { |
752 | unsigned i; | |
753 | ||
754 | for (i = 0; i < ELEMENTSOF(parsed); i++) | |
755 | u->bytes[i] = parsed[i]; | |
756 | } | |
f4ce2b3e LP |
757 | |
758 | return 0; | |
759 | } | |
b872e9a0 | 760 | |
bd2865ca LP |
761 | int efi_loader_get_entries(char ***ret) { |
762 | _cleanup_free_ char16_t *entries = NULL; | |
763 | _cleanup_strv_free_ char **l = NULL; | |
764 | size_t size, i, start; | |
765 | int r; | |
766 | ||
767 | assert(ret); | |
768 | ||
769 | if (!is_efi_boot()) | |
770 | return -EOPNOTSUPP; | |
771 | ||
772 | r = efi_get_variable(EFI_VENDOR_LOADER, "LoaderEntries", NULL, (void**) &entries, &size); | |
773 | if (r < 0) | |
774 | return r; | |
775 | ||
776 | /* The variable contains a series of individually NUL terminated UTF-16 strings. */ | |
777 | ||
778 | for (i = 0, start = 0;; i++) { | |
779 | char *decoded; | |
780 | bool end; | |
781 | ||
782 | /* Is this the end of the variable's data? */ | |
783 | end = i * sizeof(char16_t) >= size; | |
784 | ||
785 | /* Are we in the middle of a string? (i.e. not at the end of the variable, nor at a NUL terminator?) If | |
786 | * so, let's go to the next entry. */ | |
787 | if (!end && entries[i] != 0) | |
788 | continue; | |
789 | ||
790 | /* We reached the end of a string, let's decode it into UTF-8 */ | |
791 | decoded = utf16_to_utf8(entries + start, (i - start) * sizeof(char16_t)); | |
792 | if (!decoded) | |
793 | return -ENOMEM; | |
794 | ||
795 | r = strv_consume(&l, decoded); | |
796 | if (r < 0) | |
797 | return r; | |
798 | ||
799 | /* We reached the end of the variable */ | |
800 | if (end) | |
801 | break; | |
802 | ||
803 | /* Continue after the NUL byte */ | |
804 | start = i + 1; | |
805 | } | |
806 | ||
807 | *ret = TAKE_PTR(l); | |
808 | return 0; | |
809 | } | |
810 | ||
b872e9a0 | 811 | #endif |
b28ce7c6 TG |
812 | |
813 | char *efi_tilt_backslashes(char *s) { | |
814 | char *p; | |
815 | ||
816 | for (p = s; *p; p++) | |
817 | if (*p == '\\') | |
818 | *p = '/'; | |
819 | ||
820 | return s; | |
821 | } |