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6629161f LP |
1 | /*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/ |
2 | ||
3 | /*** | |
4 | This file is part of systemd. | |
5 | ||
6 | Copyright 2013 Lennart Poettering | |
7 | ||
8 | systemd is free software; you can redistribute it and/or modify it | |
9 | under the terms of the GNU Lesser General Public License as published by | |
10 | the Free Software Foundation; either version 2.1 of the License, or | |
11 | (at your option) any later version. | |
12 | ||
13 | systemd is distributed in the hope that it will be useful, but | |
14 | WITHOUT ANY WARRANTY; without even the implied warranty of | |
15 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
16 | Lesser General Public License for more details. | |
17 | ||
18 | You should have received a copy of the GNU Lesser General Public License | |
19 | along with systemd; If not, see <http://www.gnu.org/licenses/>. | |
20 | ***/ | |
21 | ||
7211f918 LP |
22 | #ifdef HAVE_VALGRIND_MEMCHECK_H |
23 | #include <valgrind/memcheck.h> | |
24 | #endif | |
25 | ||
6629161f | 26 | #include <fcntl.h> |
c556fe79 | 27 | #include <malloc.h> |
e7d718af | 28 | #include <libgen.h> |
fd8d62d9 | 29 | #include <sys/mman.h> |
5972fe95 | 30 | #include <sys/prctl.h> |
6629161f LP |
31 | |
32 | #include "util.h" | |
65dae17a | 33 | #include "strv.h" |
6bcf0cf6 | 34 | #include "memfd-util.h" |
34a5d5e5 | 35 | #include "capability.h" |
1a299299 LP |
36 | #include "cgroup-util.h" |
37 | #include "fileio.h" | |
6629161f LP |
38 | |
39 | #include "bus-internal.h" | |
40 | #include "bus-message.h" | |
41 | #include "bus-kernel.h" | |
a56f19c4 | 42 | #include "bus-bloom.h" |
777d7a61 | 43 | #include "bus-util.h" |
a6278b88 | 44 | #include "bus-label.h" |
777d7a61 LP |
45 | |
46 | #define UNIQUE_NAME_MAX (3+DECIMAL_STR_MAX(uint64_t)) | |
6629161f | 47 | |
c7819669 | 48 | int bus_kernel_parse_unique_name(const char *s, uint64_t *id) { |
6629161f LP |
49 | int r; |
50 | ||
51 | assert(s); | |
52 | assert(id); | |
53 | ||
54 | if (!startswith(s, ":1.")) | |
55 | return 0; | |
56 | ||
57 | r = safe_atou64(s + 3, id); | |
58 | if (r < 0) | |
59 | return r; | |
60 | ||
61 | return 1; | |
62 | } | |
63 | ||
febfd508 | 64 | static void append_payload_vec(struct kdbus_item **d, const void *p, size_t sz) { |
6629161f | 65 | assert(d); |
6629161f LP |
66 | assert(sz > 0); |
67 | ||
e86b80b8 LP |
68 | *d = ALIGN8_PTR(*d); |
69 | ||
66b26c5c LP |
70 | /* Note that p can be NULL, which encodes a region full of |
71 | * zeroes, which is useful to optimize certain padding | |
72 | * conditions */ | |
73 | ||
febfd508 | 74 | (*d)->size = offsetof(struct kdbus_item, vec) + sizeof(struct kdbus_vec); |
ea1edece | 75 | (*d)->type = KDBUS_ITEM_PAYLOAD_VEC; |
a392d361 | 76 | (*d)->vec.address = PTR_TO_UINT64(p); |
6629161f LP |
77 | (*d)->vec.size = sz; |
78 | ||
febfd508 | 79 | *d = (struct kdbus_item *) ((uint8_t*) *d + (*d)->size); |
6629161f LP |
80 | } |
81 | ||
77adde63 | 82 | static void append_payload_memfd(struct kdbus_item **d, int memfd, size_t start, size_t sz) { |
a392d361 LP |
83 | assert(d); |
84 | assert(memfd >= 0); | |
85 | assert(sz > 0); | |
86 | ||
87 | *d = ALIGN8_PTR(*d); | |
88 | (*d)->size = offsetof(struct kdbus_item, memfd) + sizeof(struct kdbus_memfd); | |
ea1edece | 89 | (*d)->type = KDBUS_ITEM_PAYLOAD_MEMFD; |
a392d361 | 90 | (*d)->memfd.fd = memfd; |
77adde63 | 91 | (*d)->memfd.start = start; |
a392d361 LP |
92 | (*d)->memfd.size = sz; |
93 | ||
94 | *d = (struct kdbus_item *) ((uint8_t*) *d + (*d)->size); | |
95 | } | |
96 | ||
febfd508 | 97 | static void append_destination(struct kdbus_item **d, const char *s, size_t length) { |
6629161f | 98 | assert(d); |
b5baa8fe | 99 | assert(s); |
6629161f | 100 | |
e86b80b8 LP |
101 | *d = ALIGN8_PTR(*d); |
102 | ||
febfd508 | 103 | (*d)->size = offsetof(struct kdbus_item, str) + length + 1; |
ea1edece | 104 | (*d)->type = KDBUS_ITEM_DST_NAME; |
51038c03 | 105 | memcpy((*d)->str, s, length + 1); |
6629161f | 106 | |
febfd508 | 107 | *d = (struct kdbus_item *) ((uint8_t*) *d + (*d)->size); |
6629161f LP |
108 | } |
109 | ||
18a28147 KS |
110 | static struct kdbus_bloom_filter *append_bloom(struct kdbus_item **d, size_t length) { |
111 | struct kdbus_item *i; | |
a56f19c4 | 112 | |
b5baa8fe | 113 | assert(d); |
b5baa8fe | 114 | |
18a28147 | 115 | i = ALIGN8_PTR(*d); |
b5baa8fe | 116 | |
18a28147 KS |
117 | i->size = offsetof(struct kdbus_item, bloom_filter) + |
118 | offsetof(struct kdbus_bloom_filter, data) + | |
119 | length; | |
120 | i->type = KDBUS_ITEM_BLOOM_FILTER; | |
b5baa8fe | 121 | |
18a28147 | 122 | *d = (struct kdbus_item *) ((uint8_t*) i + i->size); |
a56f19c4 | 123 | |
18a28147 | 124 | return &i->bloom_filter; |
a56f19c4 LP |
125 | } |
126 | ||
febfd508 | 127 | static void append_fds(struct kdbus_item **d, const int fds[], unsigned n_fds) { |
9097fe29 LP |
128 | assert(d); |
129 | assert(fds); | |
130 | assert(n_fds > 0); | |
131 | ||
132 | *d = ALIGN8_PTR(*d); | |
febfd508 | 133 | (*d)->size = offsetof(struct kdbus_item, fds) + sizeof(int) * n_fds; |
ea1edece | 134 | (*d)->type = KDBUS_ITEM_FDS; |
9097fe29 LP |
135 | memcpy((*d)->fds, fds, sizeof(int) * n_fds); |
136 | ||
febfd508 | 137 | *d = (struct kdbus_item *) ((uint8_t*) *d + (*d)->size); |
9097fe29 LP |
138 | } |
139 | ||
1abe54d9 LP |
140 | static void add_bloom_arg(void *data, size_t size, unsigned n_hash, unsigned i, const char *t) { |
141 | char buf[sizeof("arg")-1 + 2 + sizeof("-slash-prefix")]; | |
142 | char *e; | |
143 | ||
144 | assert(data); | |
145 | assert(size > 0); | |
146 | assert(i < 64); | |
147 | assert(t); | |
148 | ||
149 | e = stpcpy(buf, "arg"); | |
150 | if (i < 10) | |
151 | *(e++) = '0' + (char) i; | |
152 | else { | |
153 | *(e++) = '0' + (char) (i / 10); | |
154 | *(e++) = '0' + (char) (i % 10); | |
155 | } | |
156 | ||
157 | *e = 0; | |
158 | bloom_add_pair(data, size, n_hash, buf, t); | |
159 | ||
160 | strcpy(e, "-dot-prefix"); | |
161 | bloom_add_prefixes(data, size, n_hash, buf, t, '.'); | |
162 | strcpy(e, "-slash-prefix"); | |
163 | bloom_add_prefixes(data, size, n_hash, buf, t, '/'); | |
164 | } | |
165 | ||
18a28147 KS |
166 | static int bus_message_setup_bloom(sd_bus_message *m, struct kdbus_bloom_filter *bloom) { |
167 | void *data; | |
a56f19c4 LP |
168 | unsigned i; |
169 | int r; | |
170 | ||
171 | assert(m); | |
172 | assert(bloom); | |
173 | ||
18a28147 | 174 | data = bloom->data; |
29804cc1 | 175 | memzero(data, m->bus->bloom_size); |
18a28147 | 176 | bloom->generation = 0; |
a56f19c4 | 177 | |
b28ff39f | 178 | bloom_add_pair(data, m->bus->bloom_size, m->bus->bloom_n_hash, "message-type", bus_message_type_to_string(m->header->type)); |
a56f19c4 LP |
179 | |
180 | if (m->interface) | |
b28ff39f | 181 | bloom_add_pair(data, m->bus->bloom_size, m->bus->bloom_n_hash, "interface", m->interface); |
a56f19c4 | 182 | if (m->member) |
b28ff39f | 183 | bloom_add_pair(data, m->bus->bloom_size, m->bus->bloom_n_hash, "member", m->member); |
a56f19c4 | 184 | if (m->path) { |
b28ff39f LP |
185 | bloom_add_pair(data, m->bus->bloom_size, m->bus->bloom_n_hash, "path", m->path); |
186 | bloom_add_pair(data, m->bus->bloom_size, m->bus->bloom_n_hash, "path-slash-prefix", m->path); | |
187 | bloom_add_prefixes(data, m->bus->bloom_size, m->bus->bloom_n_hash, "path-slash-prefix", m->path, '/'); | |
a56f19c4 LP |
188 | } |
189 | ||
190 | r = sd_bus_message_rewind(m, true); | |
191 | if (r < 0) | |
192 | return r; | |
193 | ||
194 | for (i = 0; i < 64; i++) { | |
1abe54d9 | 195 | const char *t, *contents; |
a56f19c4 | 196 | char type; |
a56f19c4 | 197 | |
1abe54d9 | 198 | r = sd_bus_message_peek_type(m, &type, &contents); |
a56f19c4 LP |
199 | if (r < 0) |
200 | return r; | |
201 | ||
1abe54d9 | 202 | if (IN_SET(type, SD_BUS_TYPE_STRING, SD_BUS_TYPE_OBJECT_PATH, SD_BUS_TYPE_SIGNATURE)) { |
a56f19c4 | 203 | |
1abe54d9 LP |
204 | /* The bloom filter includes simple strings of any kind */ |
205 | r = sd_bus_message_read_basic(m, type, &t); | |
206 | if (r < 0) | |
207 | return r; | |
208 | ||
209 | add_bloom_arg(data, m->bus->bloom_size, m->bus->bloom_n_hash, i, t); | |
210 | } if (type == SD_BUS_TYPE_ARRAY && STR_IN_SET(contents, "s", "o", "g")) { | |
211 | ||
212 | /* As well as array of simple strings of any kinds */ | |
213 | r = sd_bus_message_enter_container(m, type, contents); | |
214 | if (r < 0) | |
215 | return r; | |
a56f19c4 | 216 | |
1abe54d9 LP |
217 | while ((r = sd_bus_message_read_basic(m, contents[0], &t)) > 0) |
218 | add_bloom_arg(data, m->bus->bloom_size, m->bus->bloom_n_hash, i, t); | |
219 | if (r < 0) | |
220 | return r; | |
221 | ||
222 | r = sd_bus_message_exit_container(m); | |
223 | if (r < 0) | |
224 | return r; | |
225 | ||
226 | } else | |
227 | /* Stop adding to bloom filter as soon as we | |
228 | * run into the first argument we cannot add | |
229 | * to it. */ | |
230 | break; | |
a56f19c4 LP |
231 | } |
232 | ||
233 | return 0; | |
b5baa8fe LP |
234 | } |
235 | ||
5b7d4c1c | 236 | static int bus_message_setup_kmsg(sd_bus *b, sd_bus_message *m) { |
9b29bb68 | 237 | struct bus_body_part *part; |
febfd508 | 238 | struct kdbus_item *d; |
022fb855 | 239 | const char *destination; |
6629161f LP |
240 | bool well_known; |
241 | uint64_t unique; | |
242 | size_t sz, dl; | |
9b29bb68 | 243 | unsigned i; |
6629161f LP |
244 | int r; |
245 | ||
5b7d4c1c | 246 | assert(b); |
6629161f LP |
247 | assert(m); |
248 | assert(m->sealed); | |
e9a967f9 | 249 | |
069f5e61 LP |
250 | /* We put this together only once, if this message is reused |
251 | * we reuse the earlier-built version */ | |
e9a967f9 LP |
252 | if (m->kdbus) |
253 | return 0; | |
6629161f | 254 | |
022fb855 DM |
255 | destination = m->destination ?: m->destination_ptr; |
256 | ||
257 | if (destination) { | |
258 | r = bus_kernel_parse_unique_name(destination, &unique); | |
6629161f LP |
259 | if (r < 0) |
260 | return r; | |
261 | ||
262 | well_known = r == 0; | |
263 | } else | |
264 | well_known = false; | |
265 | ||
b1454bf0 | 266 | sz = offsetof(struct kdbus_msg, items); |
6629161f | 267 | |
69aec65c | 268 | /* Add in fixed header, fields header and payload */ |
77adde63 DH |
269 | sz += (1 + m->n_body_parts) * ALIGN8(offsetof(struct kdbus_item, vec) + |
270 | MAX(sizeof(struct kdbus_vec), | |
271 | sizeof(struct kdbus_memfd))); | |
6629161f | 272 | |
69aec65c | 273 | /* Add space for bloom filter */ |
18a28147 KS |
274 | sz += ALIGN8(offsetof(struct kdbus_item, bloom_filter) + |
275 | offsetof(struct kdbus_bloom_filter, data) + | |
b28ff39f | 276 | m->bus->bloom_size); |
b5baa8fe | 277 | |
6629161f LP |
278 | /* Add in well-known destination header */ |
279 | if (well_known) { | |
022fb855 | 280 | dl = strlen(destination); |
febfd508 | 281 | sz += ALIGN8(offsetof(struct kdbus_item, str) + dl + 1); |
6629161f LP |
282 | } |
283 | ||
9097fe29 LP |
284 | /* Add space for unix fds */ |
285 | if (m->n_fds > 0) | |
febfd508 | 286 | sz += ALIGN8(offsetof(struct kdbus_item, fds) + sizeof(int)*m->n_fds); |
9097fe29 | 287 | |
c556fe79 | 288 | m->kdbus = memalign(8, sz); |
66b26c5c LP |
289 | if (!m->kdbus) { |
290 | r = -ENOMEM; | |
291 | goto fail; | |
292 | } | |
6629161f | 293 | |
66b26c5c | 294 | m->free_kdbus = true; |
29804cc1 | 295 | memzero(m->kdbus, sz); |
d9115e18 | 296 | |
6629161f | 297 | m->kdbus->flags = |
94e15fdc DH |
298 | ((m->header->flags & BUS_MESSAGE_NO_REPLY_EXPECTED) ? 0 : KDBUS_MSG_EXPECT_REPLY) | |
299 | ((m->header->flags & BUS_MESSAGE_NO_AUTO_START) ? KDBUS_MSG_NO_AUTO_START : 0); | |
022fb855 | 300 | |
7fa934b0 | 301 | if (well_known) |
022fb855 DM |
302 | /* verify_destination_id will usually be 0, which makes the kernel driver only look |
303 | * at the provided well-known name. Otherwise, the kernel will make sure the provided | |
304 | * destination id matches the owner of the provided weel-known-name, and fail if they | |
305 | * differ. Currently, this is only needed for bus-proxyd. */ | |
306 | m->kdbus->dst_id = m->verify_destination_id; | |
7fa934b0 | 307 | else |
022fb855 | 308 | m->kdbus->dst_id = destination ? unique : KDBUS_DST_ID_BROADCAST; |
022fb855 | 309 | |
6647dc66 | 310 | m->kdbus->payload_type = KDBUS_PAYLOAD_DBUS; |
42c4ebcb | 311 | m->kdbus->cookie = (uint64_t) m->header->serial; |
ca7b42c8 | 312 | m->kdbus->priority = m->priority; |
80a33f11 | 313 | |
7fa934b0 | 314 | if (m->header->flags & BUS_MESSAGE_NO_REPLY_EXPECTED) |
693eb9a2 | 315 | m->kdbus->cookie_reply = m->reply_cookie; |
7fa934b0 | 316 | else { |
03785ad0 DM |
317 | struct timespec now; |
318 | ||
b680a194 | 319 | assert_se(clock_gettime(CLOCK_MONOTONIC_COARSE, &now) == 0); |
03785ad0 DM |
320 | m->kdbus->timeout_ns = now.tv_sec * NSEC_PER_SEC + now.tv_nsec + |
321 | m->timeout * NSEC_PER_USEC; | |
322 | } | |
6629161f | 323 | |
b1454bf0 | 324 | d = m->kdbus->items; |
6629161f LP |
325 | |
326 | if (well_known) | |
022fb855 | 327 | append_destination(&d, destination, dl); |
6629161f | 328 | |
c91cb83c | 329 | append_payload_vec(&d, m->header, BUS_MESSAGE_BODY_BEGIN(m)); |
a392d361 LP |
330 | |
331 | MESSAGE_FOREACH_PART(part, i, m) { | |
332 | if (part->is_zero) { | |
66b26c5c LP |
333 | /* If this is padding then simply send a |
334 | * vector with a NULL data pointer which the | |
335 | * kernel will just pass through. This is the | |
336 | * most efficient way to encode zeroes */ | |
337 | ||
a392d361 LP |
338 | append_payload_vec(&d, NULL, part->size); |
339 | continue; | |
340 | } | |
341 | ||
022fb855 | 342 | if (part->memfd >= 0 && part->sealed && destination) { |
66b26c5c LP |
343 | /* Try to send a memfd, if the part is |
344 | * sealed and this is not a broadcast. Since we can only */ | |
a392d361 | 345 | |
77adde63 | 346 | append_payload_memfd(&d, part->memfd, part->memfd_offset, part->size); |
66b26c5c | 347 | continue; |
a392d361 LP |
348 | } |
349 | ||
73e231ab JE |
350 | /* Otherwise, let's send a vector to the actual data. |
351 | * For that, we need to map it first. */ | |
66b26c5c LP |
352 | r = bus_body_part_map(part); |
353 | if (r < 0) | |
354 | goto fail; | |
a392d361 | 355 | |
bc7fd8cd | 356 | append_payload_vec(&d, part->data, part->size); |
a392d361 | 357 | } |
6629161f | 358 | |
5b7d4c1c | 359 | if (m->kdbus->dst_id == KDBUS_DST_ID_BROADCAST) { |
18a28147 | 360 | struct kdbus_bloom_filter *bloom; |
5b7d4c1c | 361 | |
b28ff39f | 362 | bloom = append_bloom(&d, m->bus->bloom_size); |
18a28147 | 363 | r = bus_message_setup_bloom(m, bloom); |
a392d361 LP |
364 | if (r < 0) |
365 | goto fail; | |
5b7d4c1c | 366 | } |
b5baa8fe | 367 | |
9097fe29 LP |
368 | if (m->n_fds > 0) |
369 | append_fds(&d, m->fds, m->n_fds); | |
370 | ||
e9a967f9 | 371 | m->kdbus->size = (uint8_t*) d - (uint8_t*) m->kdbus; |
6629161f LP |
372 | assert(m->kdbus->size <= sz); |
373 | ||
374 | return 0; | |
a392d361 LP |
375 | |
376 | fail: | |
66b26c5c | 377 | m->poisoned = true; |
a392d361 | 378 | return r; |
6629161f LP |
379 | } |
380 | ||
7d31d924 LP |
381 | static void bus_message_set_sender_driver(sd_bus *bus, sd_bus_message *m) { |
382 | assert(bus); | |
383 | assert(m); | |
384 | ||
385 | m->sender = m->creds.unique_name = (char*) "org.freedesktop.DBus"; | |
386 | m->creds.well_known_names_driver = true; | |
387 | m->creds.mask |= (SD_BUS_CREDS_UNIQUE_NAME|SD_BUS_CREDS_WELL_KNOWN_NAMES) & bus->creds_mask; | |
388 | } | |
389 | ||
125dd074 ZJS |
390 | static void unset_memfds(struct sd_bus_message *m) { |
391 | struct bus_body_part *part; | |
392 | unsigned i; | |
393 | ||
394 | assert(m); | |
395 | ||
396 | /* Make sure the memfds are not freed twice */ | |
397 | MESSAGE_FOREACH_PART(part, i, m) | |
398 | if (part->memfd >= 0) | |
399 | part->memfd = -1; | |
400 | } | |
401 | ||
cb67f718 DM |
402 | static int bus_kernel_make_message(sd_bus *bus, struct kdbus_msg *k) { |
403 | sd_bus_message *m = NULL; | |
404 | struct kdbus_item *d; | |
405 | unsigned n_fds = 0; | |
406 | _cleanup_free_ int *fds = NULL; | |
407 | struct bus_header *h = NULL; | |
408 | size_t total, n_bytes = 0, idx = 0; | |
409 | const char *destination = NULL, *seclabel = NULL; | |
6629161f LP |
410 | int r; |
411 | ||
cb67f718 DM |
412 | assert(bus); |
413 | assert(k); | |
414 | assert(k->payload_type == KDBUS_PAYLOAD_DBUS); | |
35460afc | 415 | |
cb67f718 DM |
416 | KDBUS_ITEM_FOREACH(d, k, items) { |
417 | size_t l; | |
f08838da | 418 | |
cb67f718 | 419 | l = d->size - offsetof(struct kdbus_item, data); |
8f155917 | 420 | |
cb67f718 | 421 | switch (d->type) { |
62b3e928 | 422 | |
cb67f718 DM |
423 | case KDBUS_ITEM_PAYLOAD_OFF: |
424 | if (!h) { | |
840ceb89 | 425 | h = (struct bus_header *)((uint8_t *)bus->kdbus_buffer + d->vec.offset); |
8a0e0ed9 | 426 | |
cb67f718 DM |
427 | if (!bus_header_is_complete(h, d->vec.size)) |
428 | return -EBADMSG; | |
429 | } | |
8a0e0ed9 | 430 | |
cb67f718 DM |
431 | n_bytes += d->vec.size; |
432 | break; | |
8a0e0ed9 | 433 | |
cb67f718 DM |
434 | case KDBUS_ITEM_PAYLOAD_MEMFD: |
435 | if (!h) | |
436 | return -EBADMSG; | |
8a0e0ed9 | 437 | |
cb67f718 DM |
438 | n_bytes += d->memfd.size; |
439 | break; | |
8a0e0ed9 | 440 | |
cb67f718 DM |
441 | case KDBUS_ITEM_FDS: { |
442 | int *f; | |
443 | unsigned j; | |
8a0e0ed9 | 444 | |
cb67f718 DM |
445 | j = l / sizeof(int); |
446 | f = realloc(fds, sizeof(int) * (n_fds + j)); | |
447 | if (!f) | |
448 | return -ENOMEM; | |
8a0e0ed9 | 449 | |
cb67f718 DM |
450 | fds = f; |
451 | memcpy(fds + n_fds, d->fds, sizeof(int) * j); | |
452 | n_fds += j; | |
453 | break; | |
454 | } | |
62b3e928 | 455 | |
cb67f718 DM |
456 | case KDBUS_ITEM_SECLABEL: |
457 | seclabel = d->str; | |
458 | break; | |
fd8d62d9 LP |
459 | } |
460 | } | |
461 | ||
cb67f718 DM |
462 | if (!h) |
463 | return -EBADMSG; | |
de297575 | 464 | |
cb67f718 DM |
465 | r = bus_header_message_size(h, &total); |
466 | if (r < 0) | |
467 | return r; | |
219728b3 | 468 | |
cb67f718 DM |
469 | if (n_bytes != total) |
470 | return -EBADMSG; | |
6629161f | 471 | |
cb67f718 DM |
472 | /* on kdbus we only speak native endian gvariant, never dbus1 |
473 | * marshalling or reverse endian */ | |
474 | if (h->version != 2 || | |
475 | h->endian != BUS_NATIVE_ENDIAN) | |
476 | return -EPROTOTYPE; | |
c58dea19 | 477 | |
cb67f718 DM |
478 | r = bus_message_from_header(bus, h, sizeof(struct bus_header), fds, n_fds, NULL, seclabel, 0, &m); |
479 | if (r < 0) | |
480 | return r; | |
6629161f | 481 | |
cb67f718 DM |
482 | /* The well-known names list is different from the other |
483 | credentials. If we asked for it, but nothing is there, this | |
484 | means that the list of well-known names is simply empty, not | |
485 | that we lack any data */ | |
35460afc | 486 | |
cb67f718 | 487 | m->creds.mask |= (SD_BUS_CREDS_UNIQUE_NAME|SD_BUS_CREDS_WELL_KNOWN_NAMES) & bus->creds_mask; |
f08838da | 488 | |
cb67f718 DM |
489 | KDBUS_ITEM_FOREACH(d, k, items) { |
490 | size_t l; | |
6629161f | 491 | |
cb67f718 | 492 | l = d->size - offsetof(struct kdbus_item, data); |
6629161f | 493 | |
cb67f718 | 494 | switch (d->type) { |
6629161f | 495 | |
cb67f718 DM |
496 | case KDBUS_ITEM_PAYLOAD_OFF: { |
497 | size_t begin_body; | |
6629161f | 498 | |
cb67f718 | 499 | begin_body = BUS_MESSAGE_BODY_BEGIN(m); |
6629161f | 500 | |
cb67f718 DM |
501 | if (idx + d->vec.size > begin_body) { |
502 | struct bus_body_part *part; | |
a43b9ca3 | 503 | |
cb67f718 | 504 | /* Contains body material */ |
6629161f | 505 | |
cb67f718 DM |
506 | part = message_append_part(m); |
507 | if (!part) { | |
508 | r = -ENOMEM; | |
509 | goto fail; | |
510 | } | |
a43b9ca3 | 511 | |
cb67f718 DM |
512 | /* A -1 offset is NUL padding. */ |
513 | part->is_zero = d->vec.offset == ~0ULL; | |
a43b9ca3 | 514 | |
cb67f718 DM |
515 | if (idx >= begin_body) { |
516 | if (!part->is_zero) | |
840ceb89 | 517 | part->data = (uint8_t *)bus->kdbus_buffer + d->vec.offset; |
cb67f718 DM |
518 | part->size = d->vec.size; |
519 | } else { | |
520 | if (!part->is_zero) | |
840ceb89 | 521 | part->data = (uint8_t *)bus->kdbus_buffer + d->vec.offset + (begin_body - idx); |
cb67f718 DM |
522 | part->size = d->vec.size - (begin_body - idx); |
523 | } | |
a43b9ca3 | 524 | |
cb67f718 | 525 | part->sealed = true; |
ff4994c5 | 526 | } |
a43b9ca3 | 527 | |
cb67f718 DM |
528 | idx += d->vec.size; |
529 | break; | |
530 | } | |
a43b9ca3 | 531 | |
cb67f718 DM |
532 | case KDBUS_ITEM_PAYLOAD_MEMFD: { |
533 | struct bus_body_part *part; | |
a43b9ca3 | 534 | |
cb67f718 DM |
535 | if (idx < BUS_MESSAGE_BODY_BEGIN(m)) { |
536 | r = -EBADMSG; | |
537 | goto fail; | |
ff4994c5 | 538 | } |
a43b9ca3 | 539 | |
cb67f718 DM |
540 | part = message_append_part(m); |
541 | if (!part) { | |
542 | r = -ENOMEM; | |
543 | goto fail; | |
544 | } | |
a43b9ca3 | 545 | |
cb67f718 | 546 | part->memfd = d->memfd.fd; |
77adde63 | 547 | part->memfd_offset = d->memfd.start; |
cb67f718 DM |
548 | part->size = d->memfd.size; |
549 | part->sealed = true; | |
a43b9ca3 | 550 | |
cb67f718 DM |
551 | idx += d->memfd.size; |
552 | break; | |
553 | } | |
a43b9ca3 | 554 | |
705a415f LP |
555 | case KDBUS_ITEM_PIDS: |
556 | ||
32802361 LP |
557 | /* The PID/TID might be missing, when the data |
558 | * is faked by some data bus proxy and it | |
559 | * lacks that information about the real | |
560 | * client since SO_PEERCRED is used for | |
561 | * that. */ | |
705a415f LP |
562 | |
563 | if (d->pids.pid > 0) { | |
564 | m->creds.pid = (pid_t) d->pids.pid; | |
565 | m->creds.mask |= SD_BUS_CREDS_PID & bus->creds_mask; | |
566 | } | |
567 | ||
705a415f LP |
568 | if (d->pids.tid > 0) { |
569 | m->creds.tid = (pid_t) d->pids.tid; | |
cb67f718 DM |
570 | m->creds.mask |= SD_BUS_CREDS_TID & bus->creds_mask; |
571 | } | |
705a415f LP |
572 | |
573 | break; | |
574 | ||
575 | case KDBUS_ITEM_CREDS: | |
576 | ||
577 | /* EUID/SUID/FSUID/EGID/SGID/FSGID might be missing too (see above). */ | |
578 | ||
fed1e721 | 579 | if ((uid_t) d->creds.uid != UID_INVALID) { |
705a415f LP |
580 | m->creds.uid = (uid_t) d->creds.uid; |
581 | m->creds.mask |= SD_BUS_CREDS_UID & bus->creds_mask; | |
582 | } | |
583 | ||
fed1e721 | 584 | if ((uid_t) d->creds.euid != UID_INVALID) { |
705a415f LP |
585 | m->creds.euid = (uid_t) d->creds.euid; |
586 | m->creds.mask |= SD_BUS_CREDS_EUID & bus->creds_mask; | |
587 | } | |
588 | ||
fed1e721 | 589 | if ((uid_t) d->creds.suid != UID_INVALID) { |
705a415f LP |
590 | m->creds.suid = (uid_t) d->creds.suid; |
591 | m->creds.mask |= SD_BUS_CREDS_SUID & bus->creds_mask; | |
592 | } | |
593 | ||
fed1e721 | 594 | if ((uid_t) d->creds.fsuid != UID_INVALID) { |
705a415f LP |
595 | m->creds.fsuid = (uid_t) d->creds.fsuid; |
596 | m->creds.mask |= SD_BUS_CREDS_FSUID & bus->creds_mask; | |
597 | } | |
598 | ||
fed1e721 | 599 | if ((gid_t) d->creds.gid != GID_INVALID) { |
705a415f LP |
600 | m->creds.gid = (gid_t) d->creds.gid; |
601 | m->creds.mask |= SD_BUS_CREDS_GID & bus->creds_mask; | |
602 | } | |
603 | ||
fed1e721 | 604 | if ((gid_t) d->creds.egid != GID_INVALID) { |
705a415f LP |
605 | m->creds.egid = (gid_t) d->creds.egid; |
606 | m->creds.mask |= SD_BUS_CREDS_EGID & bus->creds_mask; | |
607 | } | |
608 | ||
fed1e721 | 609 | if ((gid_t) d->creds.sgid != GID_INVALID) { |
705a415f LP |
610 | m->creds.sgid = (gid_t) d->creds.sgid; |
611 | m->creds.mask |= SD_BUS_CREDS_SGID & bus->creds_mask; | |
612 | } | |
613 | ||
fed1e721 | 614 | if ((gid_t) d->creds.fsgid != GID_INVALID) { |
705a415f LP |
615 | m->creds.fsgid = (gid_t) d->creds.fsgid; |
616 | m->creds.mask |= SD_BUS_CREDS_FSGID & bus->creds_mask; | |
617 | } | |
618 | ||
cb67f718 | 619 | break; |
6629161f | 620 | |
cb67f718 | 621 | case KDBUS_ITEM_TIMESTAMP: |
41add995 LP |
622 | |
623 | if (bus->attach_flags & KDBUS_ATTACH_TIMESTAMP) { | |
624 | m->realtime = d->timestamp.realtime_ns / NSEC_PER_USEC; | |
625 | m->monotonic = d->timestamp.monotonic_ns / NSEC_PER_USEC; | |
626 | m->seqnum = d->timestamp.seqnum; | |
627 | } | |
628 | ||
cb67f718 | 629 | break; |
fd8d62d9 | 630 | |
cb67f718 DM |
631 | case KDBUS_ITEM_PID_COMM: |
632 | m->creds.comm = d->str; | |
633 | m->creds.mask |= SD_BUS_CREDS_COMM & bus->creds_mask; | |
634 | break; | |
fd8d62d9 | 635 | |
cb67f718 DM |
636 | case KDBUS_ITEM_TID_COMM: |
637 | m->creds.tid_comm = d->str; | |
638 | m->creds.mask |= SD_BUS_CREDS_TID_COMM & bus->creds_mask; | |
639 | break; | |
6629161f | 640 | |
cb67f718 DM |
641 | case KDBUS_ITEM_EXE: |
642 | m->creds.exe = d->str; | |
643 | m->creds.mask |= SD_BUS_CREDS_EXE & bus->creds_mask; | |
644 | break; | |
6629161f | 645 | |
cb67f718 DM |
646 | case KDBUS_ITEM_CMDLINE: |
647 | m->creds.cmdline = d->str; | |
648 | m->creds.cmdline_size = l; | |
649 | m->creds.mask |= SD_BUS_CREDS_CMDLINE & bus->creds_mask; | |
650 | break; | |
777d7a61 | 651 | |
cb67f718 DM |
652 | case KDBUS_ITEM_CGROUP: |
653 | m->creds.cgroup = d->str; | |
654 | m->creds.mask |= (SD_BUS_CREDS_CGROUP|SD_BUS_CREDS_UNIT|SD_BUS_CREDS_USER_UNIT|SD_BUS_CREDS_SLICE|SD_BUS_CREDS_SESSION|SD_BUS_CREDS_OWNER_UID) & bus->creds_mask; | |
777d7a61 | 655 | |
fe3f22d1 DK |
656 | r = bus_get_root_path(bus); |
657 | if (r < 0) | |
658 | goto fail; | |
777d7a61 | 659 | |
cb67f718 | 660 | m->creds.cgroup_root = bus->cgroup_root; |
777d7a61 | 661 | |
cb67f718 | 662 | break; |
777d7a61 | 663 | |
cb67f718 | 664 | case KDBUS_ITEM_AUDIT: |
6dfcc64b LP |
665 | if ((uint32_t) d->audit.sessionid != (uint32_t) -1) { |
666 | m->creds.audit_session_id = (uint32_t) d->audit.sessionid; | |
667 | m->creds.mask |= SD_BUS_CREDS_AUDIT_SESSION_ID & bus->creds_mask; | |
668 | } | |
669 | ||
fed1e721 | 670 | if ((uid_t) d->audit.loginuid != UID_INVALID) { |
6dfcc64b LP |
671 | m->creds.audit_login_uid = (uid_t) d->audit.loginuid; |
672 | m->creds.mask |= SD_BUS_CREDS_AUDIT_LOGIN_UID & bus->creds_mask; | |
673 | } | |
cb67f718 | 674 | break; |
777d7a61 | 675 | |
cb67f718 | 676 | case KDBUS_ITEM_CAPS: |
34a5d5e5 DH |
677 | if (d->caps.last_cap != cap_last_cap() || |
678 | d->size - offsetof(struct kdbus_item, caps.caps) < DIV_ROUND_UP(d->caps.last_cap, 32U) * 4 * 4) { | |
679 | r = -EBADMSG; | |
680 | goto fail; | |
681 | } | |
682 | ||
7d9fcc2b | 683 | m->creds.capability = d->caps.caps; |
cb67f718 DM |
684 | m->creds.mask |= (SD_BUS_CREDS_EFFECTIVE_CAPS|SD_BUS_CREDS_PERMITTED_CAPS|SD_BUS_CREDS_INHERITABLE_CAPS|SD_BUS_CREDS_BOUNDING_CAPS) & bus->creds_mask; |
685 | break; | |
219728b3 | 686 | |
cb67f718 | 687 | case KDBUS_ITEM_DST_NAME: |
9f6dfd06 LP |
688 | if (!service_name_is_valid(d->str)) { |
689 | r = -EBADMSG; | |
690 | goto fail; | |
691 | } | |
219728b3 | 692 | |
cb67f718 DM |
693 | destination = d->str; |
694 | break; | |
777d7a61 | 695 | |
635f9f0d | 696 | case KDBUS_ITEM_OWNED_NAME: |
9f6dfd06 LP |
697 | if (!service_name_is_valid(d->name.name)) { |
698 | r = -EBADMSG; | |
cb67f718 | 699 | goto fail; |
9f6dfd06 LP |
700 | } |
701 | ||
702 | if (bus->creds_mask & SD_BUS_CREDS_WELL_KNOWN_NAMES) { | |
50c45216 LP |
703 | char **wkn; |
704 | size_t n; | |
705 | ||
706 | /* We just extend the array here, but | |
707 | * do not allocate the strings inside | |
708 | * of it, instead we just point to our | |
709 | * buffer directly. */ | |
710 | n = strv_length(m->creds.well_known_names); | |
711 | wkn = realloc(m->creds.well_known_names, (n + 2) * sizeof(char*)); | |
712 | if (!wkn) { | |
713 | r = -ENOMEM; | |
9f6dfd06 | 714 | goto fail; |
50c45216 LP |
715 | } |
716 | ||
717 | wkn[n] = d->name.name; | |
718 | wkn[n+1] = NULL; | |
719 | m->creds.well_known_names = wkn; | |
9f6dfd06 LP |
720 | |
721 | m->creds.mask |= SD_BUS_CREDS_WELL_KNOWN_NAMES; | |
722 | } | |
cb67f718 | 723 | break; |
777d7a61 | 724 | |
635f9f0d | 725 | case KDBUS_ITEM_CONN_DESCRIPTION: |
455971c1 LP |
726 | m->creds.description = d->str; |
727 | m->creds.mask |= SD_BUS_CREDS_DESCRIPTION & bus->creds_mask; | |
cccb0b2c LP |
728 | break; |
729 | ||
02581590 LP |
730 | case KDBUS_ITEM_AUXGROUPS: |
731 | ||
732 | if (bus->creds_mask & SD_BUS_CREDS_SUPPLEMENTARY_GIDS) { | |
e12d81ae | 733 | assert_cc(sizeof(gid_t) == sizeof(uint32_t)); |
02581590 | 734 | |
e12d81ae LP |
735 | m->creds.n_supplementary_gids = (d->size - offsetof(struct kdbus_item, data32)) / sizeof(uint32_t); |
736 | m->creds.supplementary_gids = (gid_t*) d->data32; | |
02581590 LP |
737 | m->creds.mask |= SD_BUS_CREDS_SUPPLEMENTARY_GIDS; |
738 | } | |
739 | ||
740 | break; | |
741 | ||
cb67f718 DM |
742 | case KDBUS_ITEM_FDS: |
743 | case KDBUS_ITEM_SECLABEL: | |
744 | break; | |
d78bf250 | 745 | |
cb67f718 DM |
746 | default: |
747 | log_debug("Got unknown field from kernel %llu", d->type); | |
748 | } | |
749 | } | |
d78bf250 | 750 | |
38ce47e2 LP |
751 | /* If we requested the list of well-known names to be appended |
752 | * and the sender had none no item for it will be | |
315a73d9 | 753 | * attached. However, this does *not* mean that the kernel |
38ce47e2 LP |
754 | * didn't want to provide this information to us. Hence, let's |
755 | * explicitly mark this information as available if it was | |
756 | * requested. */ | |
757 | m->creds.mask |= bus->creds_mask & SD_BUS_CREDS_WELL_KNOWN_NAMES; | |
758 | ||
cb67f718 DM |
759 | r = bus_message_parse_fields(m); |
760 | if (r < 0) | |
761 | goto fail; | |
777d7a61 | 762 | |
7fa934b0 LP |
763 | /* Refuse messages if kdbus and dbus1 cookie doesn't match up */ |
764 | if ((uint64_t) m->header->serial != k->cookie) { | |
765 | r = -EBADMSG; | |
766 | goto fail; | |
767 | } | |
768 | ||
769 | /* Refuse messages where the reply flag doesn't match up */ | |
94e15fdc | 770 | if (!(m->header->flags & BUS_MESSAGE_NO_REPLY_EXPECTED) != !!(k->flags & KDBUS_MSG_EXPECT_REPLY)) { |
7fa934b0 LP |
771 | r = -EBADMSG; |
772 | goto fail; | |
773 | } | |
774 | ||
775 | /* Refuse reply messages where the reply cookie doesn't match up */ | |
776 | if ((m->header->flags & BUS_MESSAGE_NO_REPLY_EXPECTED) && m->reply_cookie != k->cookie_reply) { | |
777 | r = -EBADMSG; | |
778 | goto fail; | |
779 | } | |
780 | ||
781 | /* Refuse messages where the autostart flag doesn't match up */ | |
94e15fdc | 782 | if (!(m->header->flags & BUS_MESSAGE_NO_AUTO_START) != !(k->flags & KDBUS_MSG_NO_AUTO_START)) { |
7fa934b0 LP |
783 | r = -EBADMSG; |
784 | goto fail; | |
785 | } | |
786 | ||
cb67f718 | 787 | /* Override information from the user header with data from the kernel */ |
7d31d924 LP |
788 | if (k->src_id == KDBUS_SRC_ID_KERNEL) |
789 | bus_message_set_sender_driver(bus, m); | |
790 | else { | |
cb67f718 DM |
791 | snprintf(m->sender_buffer, sizeof(m->sender_buffer), ":1.%llu", (unsigned long long) k->src_id); |
792 | m->sender = m->creds.unique_name = m->sender_buffer; | |
793 | } | |
777d7a61 | 794 | |
cb67f718 DM |
795 | if (destination) |
796 | m->destination = destination; | |
797 | else if (k->dst_id == KDBUS_DST_ID_BROADCAST) | |
798 | m->destination = NULL; | |
799 | else if (k->dst_id == KDBUS_DST_ID_NAME) | |
800 | m->destination = bus->unique_name; /* fill in unique name if the well-known name is missing */ | |
801 | else { | |
802 | snprintf(m->destination_buffer, sizeof(m->destination_buffer), ":1.%llu", (unsigned long long) k->dst_id); | |
803 | m->destination = m->destination_buffer; | |
804 | } | |
777d7a61 | 805 | |
cb67f718 DM |
806 | /* We take possession of the kmsg struct now */ |
807 | m->kdbus = k; | |
808 | m->release_kdbus = true; | |
809 | m->free_fds = true; | |
810 | fds = NULL; | |
777d7a61 | 811 | |
cb67f718 | 812 | bus->rqueue[bus->rqueue_size++] = m; |
777d7a61 | 813 | |
cb67f718 | 814 | return 1; |
777d7a61 | 815 | |
cb67f718 | 816 | fail: |
125dd074 ZJS |
817 | unset_memfds(m); |
818 | sd_bus_message_unref(m); | |
777d7a61 | 819 | |
cb67f718 DM |
820 | return r; |
821 | } | |
777d7a61 | 822 | |
cb67f718 | 823 | int bus_kernel_take_fd(sd_bus *b) { |
18ee085c DH |
824 | struct kdbus_cmd_free cmd_free = { |
825 | .size = sizeof(cmd_free), | |
826 | .flags = 0, | |
827 | }; | |
d31f486b | 828 | struct kdbus_bloom_parameter *bloom = NULL; |
cb67f718 | 829 | struct kdbus_cmd_hello *hello; |
d31f486b | 830 | struct kdbus_item_list *items; |
cb67f718 | 831 | struct kdbus_item *item; |
5972fe95 LP |
832 | _cleanup_free_ char *g = NULL; |
833 | const char *name; | |
834 | size_t l = 0, m = 0, sz; | |
cb67f718 | 835 | int r; |
777d7a61 | 836 | |
cb67f718 | 837 | assert(b); |
7adc46fc | 838 | |
cb67f718 DM |
839 | if (b->is_server) |
840 | return -EINVAL; | |
777d7a61 | 841 | |
cb67f718 | 842 | b->use_memfd = 1; |
777d7a61 | 843 | |
455971c1 LP |
844 | if (b->description) { |
845 | g = bus_label_escape(b->description); | |
5972fe95 LP |
846 | if (!g) |
847 | return -ENOMEM; | |
848 | ||
849 | name = g; | |
850 | } else { | |
851 | char pr[17] = {}; | |
852 | ||
853 | /* If no name is explicitly set, we'll include a hint | |
854 | * indicating the library implementation, a hint which | |
855 | * kind of bus this is and the thread name */ | |
856 | ||
857 | assert_se(prctl(PR_GET_NAME, (unsigned long) pr) >= 0); | |
858 | ||
859 | if (isempty(pr)) { | |
860 | name = b->is_system ? "sd-system" : | |
861 | b->is_user ? "sd-user" : "sd"; | |
862 | } else { | |
863 | _cleanup_free_ char *e = NULL; | |
864 | ||
a6278b88 | 865 | e = bus_label_escape(pr); |
5972fe95 LP |
866 | if (!e) |
867 | return -ENOMEM; | |
868 | ||
869 | g = strappend(b->is_system ? "sd-system-" : | |
870 | b->is_user ? "sd-user-" : "sd-", | |
871 | e); | |
872 | if (!g) | |
873 | return -ENOMEM; | |
874 | ||
875 | name = g; | |
876 | } | |
877 | ||
455971c1 LP |
878 | b->description = bus_label_unescape(name); |
879 | if (!b->description) | |
5972fe95 LP |
880 | return -ENOMEM; |
881 | } | |
882 | ||
883 | m = strlen(name); | |
884 | ||
885 | sz = ALIGN8(offsetof(struct kdbus_cmd_hello, items)) + | |
886 | ALIGN8(offsetof(struct kdbus_item, str) + m + 1); | |
777d7a61 | 887 | |
cb67f718 | 888 | if (b->fake_creds_valid) |
5972fe95 | 889 | sz += ALIGN8(offsetof(struct kdbus_item, creds) + sizeof(struct kdbus_creds)); |
777d7a61 | 890 | |
705a415f LP |
891 | if (b->fake_pids_valid) |
892 | sz += ALIGN8(offsetof(struct kdbus_item, pids) + sizeof(struct kdbus_pids)); | |
893 | ||
cb67f718 DM |
894 | if (b->fake_label) { |
895 | l = strlen(b->fake_label); | |
896 | sz += ALIGN8(offsetof(struct kdbus_item, str) + l + 1); | |
897 | } | |
777d7a61 | 898 | |
7f3d3ba1 | 899 | hello = alloca0_align(sz, 8); |
cb67f718 | 900 | hello->size = sz; |
bc75205c | 901 | hello->flags = b->hello_flags; |
6f5c810a | 902 | hello->attach_flags_send = _KDBUS_ATTACH_ANY; |
d704fda9 | 903 | hello->attach_flags_recv = b->attach_flags; |
cb67f718 | 904 | hello->pool_size = KDBUS_POOL_SIZE; |
777d7a61 | 905 | |
cb67f718 DM |
906 | item = hello->items; |
907 | ||
5972fe95 | 908 | item->size = offsetof(struct kdbus_item, str) + m + 1; |
635f9f0d | 909 | item->type = KDBUS_ITEM_CONN_DESCRIPTION; |
5972fe95 LP |
910 | memcpy(item->str, name, m + 1); |
911 | item = KDBUS_ITEM_NEXT(item); | |
912 | ||
cb67f718 DM |
913 | if (b->fake_creds_valid) { |
914 | item->size = offsetof(struct kdbus_item, creds) + sizeof(struct kdbus_creds); | |
915 | item->type = KDBUS_ITEM_CREDS; | |
916 | item->creds = b->fake_creds; | |
917 | ||
918 | item = KDBUS_ITEM_NEXT(item); | |
777d7a61 LP |
919 | } |
920 | ||
705a415f LP |
921 | if (b->fake_pids_valid) { |
922 | item->size = offsetof(struct kdbus_item, pids) + sizeof(struct kdbus_pids); | |
923 | item->type = KDBUS_ITEM_PIDS; | |
924 | item->pids = b->fake_pids; | |
925 | ||
926 | item = KDBUS_ITEM_NEXT(item); | |
927 | } | |
928 | ||
cb67f718 DM |
929 | if (b->fake_label) { |
930 | item->size = offsetof(struct kdbus_item, str) + l + 1; | |
5972fe95 | 931 | item->type = KDBUS_ITEM_SECLABEL; |
cb67f718 | 932 | memcpy(item->str, b->fake_label, l+1); |
777d7a61 LP |
933 | } |
934 | ||
cb67f718 DM |
935 | r = ioctl(b->input_fd, KDBUS_CMD_HELLO, hello); |
936 | if (r < 0) | |
937 | return -errno; | |
777d7a61 | 938 | |
cb67f718 DM |
939 | if (!b->kdbus_buffer) { |
940 | b->kdbus_buffer = mmap(NULL, KDBUS_POOL_SIZE, PROT_READ, MAP_SHARED, b->input_fd, 0); | |
941 | if (b->kdbus_buffer == MAP_FAILED) { | |
942 | b->kdbus_buffer = NULL; | |
d31f486b DH |
943 | r = -errno; |
944 | goto fail; | |
cb67f718 DM |
945 | } |
946 | } | |
6629161f | 947 | |
4a3e79e1 | 948 | /* The higher 32bit of the bus_flags fields are considered |
cb67f718 | 949 | * 'incompatible flags'. Refuse them all for now. */ |
d31f486b DH |
950 | if (hello->bus_flags > 0xFFFFFFFFULL) { |
951 | r = -ENOTSUP; | |
952 | goto fail; | |
953 | } | |
6629161f | 954 | |
d31f486b DH |
955 | /* extract bloom parameters from items */ |
956 | items = (void*)((uint8_t*)b->kdbus_buffer + hello->offset); | |
957 | KDBUS_ITEM_FOREACH(item, items, items) { | |
958 | switch (item->type) { | |
959 | case KDBUS_ITEM_BLOOM_PARAMETER: | |
960 | bloom = &item->bloom_parameter; | |
961 | break; | |
962 | } | |
963 | } | |
6629161f | 964 | |
d31f486b DH |
965 | if (!bloom || !bloom_validate_parameters((size_t) bloom->size, (unsigned) bloom->n_hash)) { |
966 | r = -ENOTSUP; | |
967 | goto fail; | |
968 | } | |
b28ff39f | 969 | |
d31f486b DH |
970 | b->bloom_size = (size_t) bloom->size; |
971 | b->bloom_n_hash = (unsigned) bloom->n_hash; | |
972 | ||
973 | if (asprintf(&b->unique_name, ":1.%llu", (unsigned long long) hello->id) < 0) { | |
974 | r = -ENOMEM; | |
975 | goto fail; | |
976 | } | |
6629161f | 977 | |
cb67f718 | 978 | b->unique_id = hello->id; |
6629161f | 979 | |
cb67f718 DM |
980 | b->is_kernel = true; |
981 | b->bus_client = true; | |
bc75205c | 982 | b->can_fds = !!(hello->flags & KDBUS_HELLO_ACCEPT_FD); |
cb67f718 DM |
983 | b->message_version = 2; |
984 | b->message_endian = BUS_NATIVE_ENDIAN; | |
c91cb83c | 985 | |
cb67f718 DM |
986 | /* the kernel told us the UUID of the underlying bus */ |
987 | memcpy(b->server_id.bytes, hello->id128, sizeof(b->server_id.bytes)); | |
6629161f | 988 | |
d31f486b DH |
989 | /* free returned items */ |
990 | (void) bus_kernel_cmd_free(b, hello->offset); | |
991 | ||
cb67f718 | 992 | return bus_start_running(b); |
d31f486b DH |
993 | |
994 | fail: | |
18ee085c DH |
995 | cmd_free.offset = hello->offset; |
996 | (void) ioctl(b->input_fd, KDBUS_CMD_FREE, &cmd_free); | |
d31f486b | 997 | return r; |
cb67f718 | 998 | } |
6629161f | 999 | |
cb67f718 DM |
1000 | int bus_kernel_connect(sd_bus *b) { |
1001 | assert(b); | |
1002 | assert(b->input_fd < 0); | |
1003 | assert(b->output_fd < 0); | |
1004 | assert(b->kernel); | |
1307c3ff | 1005 | |
cb67f718 DM |
1006 | if (b->is_server) |
1007 | return -EINVAL; | |
1307c3ff | 1008 | |
cb67f718 DM |
1009 | b->input_fd = open(b->kernel, O_RDWR|O_NOCTTY|O_CLOEXEC); |
1010 | if (b->input_fd < 0) | |
1011 | return -errno; | |
6629161f | 1012 | |
cb67f718 | 1013 | b->output_fd = b->input_fd; |
6629161f | 1014 | |
cb67f718 DM |
1015 | return bus_kernel_take_fd(b); |
1016 | } | |
f9be01f3 | 1017 | |
52cfc037 LP |
1018 | int bus_kernel_cmd_free(sd_bus *bus, uint64_t offset) { |
1019 | struct kdbus_cmd_free cmd = { | |
d31f486b | 1020 | .size = sizeof(cmd), |
52cfc037 LP |
1021 | .flags = 0, |
1022 | .offset = offset, | |
1023 | }; | |
1024 | int r; | |
1025 | ||
1026 | assert(bus); | |
1027 | assert(bus->is_kernel); | |
1028 | ||
1029 | r = ioctl(bus->input_fd, KDBUS_CMD_FREE, &cmd); | |
1030 | if (r < 0) | |
1031 | return -errno; | |
1032 | ||
1033 | return 0; | |
1034 | } | |
1035 | ||
069f5e61 | 1036 | static void close_kdbus_msg(sd_bus *bus, struct kdbus_msg *k) { |
069f5e61 LP |
1037 | struct kdbus_item *d; |
1038 | ||
1039 | assert(bus); | |
1040 | assert(k); | |
1041 | ||
069f5e61 | 1042 | KDBUS_ITEM_FOREACH(d, k, items) { |
069f5e61 LP |
1043 | if (d->type == KDBUS_ITEM_FDS) |
1044 | close_many(d->fds, (d->size - offsetof(struct kdbus_item, fds)) / sizeof(int)); | |
1045 | else if (d->type == KDBUS_ITEM_PAYLOAD_MEMFD) | |
03e334a1 | 1046 | safe_close(d->memfd.fd); |
069f5e61 | 1047 | } |
ca794c8e | 1048 | |
52cfc037 | 1049 | bus_kernel_cmd_free(bus, (uint8_t*) k - (uint8_t*) bus->kdbus_buffer); |
069f5e61 LP |
1050 | } |
1051 | ||
1052 | int bus_kernel_write_message(sd_bus *bus, sd_bus_message *m, bool hint_sync_call) { | |
94e15fdc | 1053 | struct kdbus_cmd_send cmd = { }; |
cb67f718 | 1054 | int r; |
6629161f | 1055 | |
cb67f718 DM |
1056 | assert(bus); |
1057 | assert(m); | |
1058 | assert(bus->state == BUS_RUNNING); | |
6629161f | 1059 | |
cb67f718 DM |
1060 | /* If we can't deliver, we want room for the error message */ |
1061 | r = bus_rqueue_make_room(bus); | |
6629161f LP |
1062 | if (r < 0) |
1063 | return r; | |
1064 | ||
cb67f718 | 1065 | r = bus_message_setup_kmsg(bus, m); |
6629161f LP |
1066 | if (r < 0) |
1067 | return r; | |
1068 | ||
94e15fdc DH |
1069 | cmd.size = sizeof(cmd); |
1070 | cmd.msg_address = (uintptr_t)m->kdbus; | |
1071 | ||
069f5e61 LP |
1072 | /* If this is a synchronous method call, then let's tell the |
1073 | * kernel, so that it can pass CPU time/scheduling to the | |
1074 | * destination for the time, if it wants to. If we | |
1075 | * synchronously wait for the result anyway, we won't need CPU | |
1076 | * anyway. */ | |
94e15fdc DH |
1077 | if (hint_sync_call) { |
1078 | m->kdbus->flags |= KDBUS_MSG_EXPECT_REPLY; | |
1079 | cmd.flags |= KDBUS_SEND_SYNC_REPLY; | |
1080 | } | |
069f5e61 | 1081 | |
94e15fdc | 1082 | r = ioctl(bus->output_fd, KDBUS_CMD_SEND, &cmd); |
cb67f718 DM |
1083 | if (r < 0) { |
1084 | _cleanup_bus_error_free_ sd_bus_error error = SD_BUS_ERROR_NULL; | |
1085 | sd_bus_message *reply; | |
253ce82b | 1086 | |
cb67f718 DM |
1087 | if (errno == EAGAIN || errno == EINTR) |
1088 | return 0; | |
1089 | else if (errno == ENXIO || errno == ESRCH) { | |
6629161f | 1090 | |
cb67f718 DM |
1091 | /* ENXIO: unique name not known |
1092 | * ESRCH: well-known name not known */ | |
6629161f | 1093 | |
cb67f718 DM |
1094 | if (m->header->type == SD_BUS_MESSAGE_METHOD_CALL) |
1095 | sd_bus_error_setf(&error, SD_BUS_ERROR_SERVICE_UNKNOWN, "Destination %s not known", m->destination); | |
1096 | else { | |
1097 | log_debug("Could not deliver message to %s as destination is not known. Ignoring.", m->destination); | |
1098 | return 0; | |
1099 | } | |
777d7a61 | 1100 | |
cb67f718 | 1101 | } else if (errno == EADDRNOTAVAIL) { |
fd8d62d9 | 1102 | |
cb67f718 | 1103 | /* EADDRNOTAVAIL: activation is possible, but turned off in request flags */ |
bc7fd8cd | 1104 | |
cb67f718 DM |
1105 | if (m->header->type == SD_BUS_MESSAGE_METHOD_CALL) |
1106 | sd_bus_error_setf(&error, SD_BUS_ERROR_SERVICE_UNKNOWN, "Activation of %s not requested", m->destination); | |
1107 | else { | |
1108 | log_debug("Could not deliver message to %s as destination is not activated. Ignoring.", m->destination); | |
1109 | return 0; | |
1110 | } | |
1111 | } else | |
1112 | return -errno; | |
bc7fd8cd | 1113 | |
cb67f718 DM |
1114 | r = bus_message_new_synthetic_error( |
1115 | bus, | |
1116 | BUS_MESSAGE_COOKIE(m), | |
1117 | &error, | |
1118 | &reply); | |
bc7fd8cd | 1119 | |
cb67f718 DM |
1120 | if (r < 0) |
1121 | return r; | |
bc7fd8cd | 1122 | |
cb67f718 DM |
1123 | r = bus_seal_synthetic_message(bus, reply); |
1124 | if (r < 0) | |
1125 | return r; | |
62b3e928 | 1126 | |
cb67f718 | 1127 | bus->rqueue[bus->rqueue_size++] = reply; |
bc7fd8cd | 1128 | |
069f5e61 LP |
1129 | } else if (hint_sync_call) { |
1130 | struct kdbus_msg *k; | |
fd8d62d9 | 1131 | |
94e15fdc | 1132 | k = (struct kdbus_msg *)((uint8_t *)bus->kdbus_buffer + cmd.reply.offset); |
069f5e61 | 1133 | assert(k); |
777d7a61 | 1134 | |
069f5e61 | 1135 | if (k->payload_type == KDBUS_PAYLOAD_DBUS) { |
1307c3ff | 1136 | |
069f5e61 LP |
1137 | r = bus_kernel_make_message(bus, k); |
1138 | if (r < 0) { | |
1139 | close_kdbus_msg(bus, k); | |
1307c3ff | 1140 | |
069f5e61 LP |
1141 | /* Anybody can send us invalid messages, let's just drop them. */ |
1142 | if (r == -EBADMSG || r == -EPROTOTYPE) | |
da927ba9 | 1143 | log_debug_errno(r, "Ignoring invalid message: %m"); |
069f5e61 LP |
1144 | else |
1145 | return r; | |
1146 | } | |
1147 | } else { | |
1148 | log_debug("Ignoring message with unknown payload type %llu.", (unsigned long long) k->payload_type); | |
1149 | close_kdbus_msg(bus, k); | |
1150 | } | |
cb67f718 | 1151 | } |
069f5e61 LP |
1152 | |
1153 | return 1; | |
cb67f718 | 1154 | } |
69aec65c | 1155 | |
cb67f718 DM |
1156 | static int push_name_owner_changed(sd_bus *bus, const char *name, const char *old_owner, const char *new_owner) { |
1157 | _cleanup_bus_message_unref_ sd_bus_message *m = NULL; | |
1158 | int r; | |
2dc9970b | 1159 | |
cb67f718 | 1160 | assert(bus); |
2dc9970b | 1161 | |
cb67f718 DM |
1162 | r = sd_bus_message_new_signal( |
1163 | bus, | |
151b9b96 | 1164 | &m, |
cb67f718 DM |
1165 | "/org/freedesktop/DBus", |
1166 | "org.freedesktop.DBus", | |
151b9b96 | 1167 | "NameOwnerChanged"); |
cb67f718 DM |
1168 | if (r < 0) |
1169 | return r; | |
2dc9970b | 1170 | |
cb67f718 DM |
1171 | r = sd_bus_message_append(m, "sss", name, old_owner, new_owner); |
1172 | if (r < 0) | |
1173 | return r; | |
5b12334d | 1174 | |
7d31d924 | 1175 | bus_message_set_sender_driver(bus, m); |
5b12334d | 1176 | |
cb67f718 DM |
1177 | r = bus_seal_synthetic_message(bus, m); |
1178 | if (r < 0) | |
1179 | return r; | |
5b12334d | 1180 | |
cb67f718 DM |
1181 | bus->rqueue[bus->rqueue_size++] = m; |
1182 | m = NULL; | |
5b12334d | 1183 | |
cb67f718 DM |
1184 | return 1; |
1185 | } | |
5b12334d | 1186 | |
cb67f718 DM |
1187 | static int translate_name_change(sd_bus *bus, struct kdbus_msg *k, struct kdbus_item *d) { |
1188 | char new_owner[UNIQUE_NAME_MAX], old_owner[UNIQUE_NAME_MAX]; | |
5b12334d | 1189 | |
cb67f718 DM |
1190 | assert(bus); |
1191 | assert(k); | |
1192 | assert(d); | |
751bc6ac | 1193 | |
619d7a03 | 1194 | if (d->type == KDBUS_ITEM_NAME_ADD || (d->name_change.old_id.flags & (KDBUS_NAME_IN_QUEUE|KDBUS_NAME_ACTIVATOR))) |
cb67f718 DM |
1195 | old_owner[0] = 0; |
1196 | else | |
619d7a03 | 1197 | sprintf(old_owner, ":1.%llu", (unsigned long long) d->name_change.old_id.id); |
751bc6ac | 1198 | |
619d7a03 | 1199 | if (d->type == KDBUS_ITEM_NAME_REMOVE || (d->name_change.new_id.flags & (KDBUS_NAME_IN_QUEUE|KDBUS_NAME_ACTIVATOR))) { |
751bc6ac | 1200 | |
cb67f718 DM |
1201 | if (isempty(old_owner)) |
1202 | return 0; | |
5b12334d | 1203 | |
cb67f718 DM |
1204 | new_owner[0] = 0; |
1205 | } else | |
619d7a03 | 1206 | sprintf(new_owner, ":1.%llu", (unsigned long long) d->name_change.new_id.id); |
5b12334d | 1207 | |
cb67f718 DM |
1208 | return push_name_owner_changed(bus, d->name_change.name, old_owner, new_owner); |
1209 | } | |
5b12334d | 1210 | |
cb67f718 DM |
1211 | static int translate_id_change(sd_bus *bus, struct kdbus_msg *k, struct kdbus_item *d) { |
1212 | char owner[UNIQUE_NAME_MAX]; | |
2e2ec0ea | 1213 | |
cb67f718 DM |
1214 | assert(bus); |
1215 | assert(k); | |
1216 | assert(d); | |
777d7a61 | 1217 | |
cb67f718 | 1218 | sprintf(owner, ":1.%llu", d->id_change.id); |
2e2ec0ea | 1219 | |
cb67f718 DM |
1220 | return push_name_owner_changed( |
1221 | bus, owner, | |
1222 | d->type == KDBUS_ITEM_ID_ADD ? NULL : owner, | |
1223 | d->type == KDBUS_ITEM_ID_ADD ? owner : NULL); | |
1224 | } | |
49b832c5 | 1225 | |
cb67f718 DM |
1226 | static int translate_reply(sd_bus *bus, struct kdbus_msg *k, struct kdbus_item *d) { |
1227 | _cleanup_bus_message_unref_ sd_bus_message *m = NULL; | |
1228 | int r; | |
777d7a61 | 1229 | |
cb67f718 DM |
1230 | assert(bus); |
1231 | assert(k); | |
1232 | assert(d); | |
acb5a3cb | 1233 | |
cb67f718 DM |
1234 | r = bus_message_new_synthetic_error( |
1235 | bus, | |
1236 | k->cookie_reply, | |
1237 | d->type == KDBUS_ITEM_REPLY_TIMEOUT ? | |
1238 | &SD_BUS_ERROR_MAKE_CONST(SD_BUS_ERROR_NO_REPLY, "Method call timed out") : | |
1239 | &SD_BUS_ERROR_MAKE_CONST(SD_BUS_ERROR_NO_REPLY, "Method call peer died"), | |
1240 | &m); | |
1307c3ff | 1241 | if (r < 0) |
cb67f718 | 1242 | return r; |
51038c03 | 1243 | |
7d31d924 | 1244 | bus_message_set_sender_driver(bus, m); |
51038c03 | 1245 | |
cb67f718 DM |
1246 | r = bus_seal_synthetic_message(bus, m); |
1247 | if (r < 0) | |
1248 | return r; | |
6629161f | 1249 | |
7adc46fc | 1250 | bus->rqueue[bus->rqueue_size++] = m; |
cb67f718 | 1251 | m = NULL; |
7d22c717 | 1252 | |
6629161f | 1253 | return 1; |
cb67f718 | 1254 | } |
1307c3ff | 1255 | |
cb67f718 DM |
1256 | static int bus_kernel_translate_message(sd_bus *bus, struct kdbus_msg *k) { |
1257 | struct kdbus_item *d, *found = NULL; | |
1307c3ff | 1258 | |
cb67f718 DM |
1259 | static int (* const translate[])(sd_bus *bus, struct kdbus_msg *k, struct kdbus_item *d) = { |
1260 | [KDBUS_ITEM_NAME_ADD - _KDBUS_ITEM_KERNEL_BASE] = translate_name_change, | |
1261 | [KDBUS_ITEM_NAME_REMOVE - _KDBUS_ITEM_KERNEL_BASE] = translate_name_change, | |
1262 | [KDBUS_ITEM_NAME_CHANGE - _KDBUS_ITEM_KERNEL_BASE] = translate_name_change, | |
1307c3ff | 1263 | |
cb67f718 DM |
1264 | [KDBUS_ITEM_ID_ADD - _KDBUS_ITEM_KERNEL_BASE] = translate_id_change, |
1265 | [KDBUS_ITEM_ID_REMOVE - _KDBUS_ITEM_KERNEL_BASE] = translate_id_change, | |
1266 | ||
1267 | [KDBUS_ITEM_REPLY_TIMEOUT - _KDBUS_ITEM_KERNEL_BASE] = translate_reply, | |
1268 | [KDBUS_ITEM_REPLY_DEAD - _KDBUS_ITEM_KERNEL_BASE] = translate_reply, | |
1269 | }; | |
1270 | ||
1271 | assert(bus); | |
1272 | assert(k); | |
1273 | assert(k->payload_type == KDBUS_PAYLOAD_KERNEL); | |
1274 | ||
1275 | KDBUS_ITEM_FOREACH(d, k, items) { | |
856d6e09 DM |
1276 | if (d->type == KDBUS_ITEM_TIMESTAMP) |
1277 | continue; | |
1278 | ||
cb67f718 DM |
1279 | if (d->type >= _KDBUS_ITEM_KERNEL_BASE && d->type < _KDBUS_ITEM_KERNEL_BASE + ELEMENTSOF(translate)) { |
1280 | if (found) | |
1281 | return -EBADMSG; | |
1282 | found = d; | |
1283 | } else | |
1284 | log_debug("Got unknown field from kernel %llu", d->type); | |
1307c3ff LP |
1285 | } |
1286 | ||
cb67f718 DM |
1287 | if (!found) { |
1288 | log_debug("Didn't find a kernel message to translate."); | |
1289 | return 0; | |
1290 | } | |
1291 | ||
1292 | return translate[found->type - _KDBUS_ITEM_KERNEL_BASE](bus, k, found); | |
6629161f LP |
1293 | } |
1294 | ||
766c5809 | 1295 | int bus_kernel_read_message(sd_bus *bus, bool hint_priority, int64_t priority) { |
94e15fdc | 1296 | struct kdbus_cmd_recv recv = { .size = sizeof(recv) }; |
6629161f | 1297 | struct kdbus_msg *k; |
6629161f LP |
1298 | int r; |
1299 | ||
1300 | assert(bus); | |
7d22c717 | 1301 | |
7adc46fc | 1302 | r = bus_rqueue_make_room(bus); |
7d22c717 LP |
1303 | if (r < 0) |
1304 | return r; | |
6629161f | 1305 | |
766c5809 LP |
1306 | if (hint_priority) { |
1307 | recv.flags |= KDBUS_RECV_USE_PRIORITY; | |
1308 | recv.priority = priority; | |
1309 | } | |
1310 | ||
94e15fdc | 1311 | r = ioctl(bus->input_fd, KDBUS_CMD_RECV, &recv); |
fd8d62d9 | 1312 | if (r < 0) { |
6629161f LP |
1313 | if (errno == EAGAIN) |
1314 | return 0; | |
1315 | ||
f9a458c6 LP |
1316 | if (errno == EOVERFLOW) { |
1317 | log_debug("%s: kdbus reports %" PRIu64 " dropped broadcast messages, ignoring.", strna(bus->description), (uint64_t) recv.dropped_msgs); | |
1318 | return 0; | |
1319 | } | |
1320 | ||
fd8d62d9 | 1321 | return -errno; |
6629161f LP |
1322 | } |
1323 | ||
94e15fdc | 1324 | k = (struct kdbus_msg *)((uint8_t *)bus->kdbus_buffer + recv.reply.offset); |
e1d337d4 | 1325 | if (k->payload_type == KDBUS_PAYLOAD_DBUS) { |
7d22c717 | 1326 | r = bus_kernel_make_message(bus, k); |
e1d337d4 LP |
1327 | |
1328 | /* Anybody can send us invalid messages, let's just drop them. */ | |
1329 | if (r == -EBADMSG || r == -EPROTOTYPE) { | |
da927ba9 | 1330 | log_debug_errno(r, "Ignoring invalid message: %m"); |
e1d337d4 LP |
1331 | r = 0; |
1332 | } | |
1333 | ||
1334 | } else if (k->payload_type == KDBUS_PAYLOAD_KERNEL) | |
7d22c717 | 1335 | r = bus_kernel_translate_message(bus, k); |
069f5e61 LP |
1336 | else { |
1337 | log_debug("Ignoring message with unknown payload type %llu.", (unsigned long long) k->payload_type); | |
777d7a61 | 1338 | r = 0; |
069f5e61 | 1339 | } |
777d7a61 | 1340 | |
fd8d62d9 LP |
1341 | if (r <= 0) |
1342 | close_kdbus_msg(bus, k); | |
6629161f | 1343 | |
51038c03 | 1344 | return r < 0 ? r : 1; |
6629161f LP |
1345 | } |
1346 | ||
8e959fbf | 1347 | int bus_kernel_pop_memfd(sd_bus *bus, void **address, size_t *mapped, size_t *allocated) { |
bc7fd8cd | 1348 | struct memfd_cache *c; |
45fbe937 | 1349 | int fd; |
bc7fd8cd LP |
1350 | |
1351 | assert(address); | |
8e959fbf LP |
1352 | assert(mapped); |
1353 | assert(allocated); | |
35460afc LP |
1354 | |
1355 | if (!bus || !bus->is_kernel) | |
1356 | return -ENOTSUP; | |
bc7fd8cd | 1357 | |
76b7742c | 1358 | assert_se(pthread_mutex_lock(&bus->memfd_cache_mutex) >= 0); |
45fbe937 | 1359 | |
bc7fd8cd | 1360 | if (bus->n_memfd_cache <= 0) { |
45fbe937 LP |
1361 | int r; |
1362 | ||
76b7742c | 1363 | assert_se(pthread_mutex_unlock(&bus->memfd_cache_mutex) >= 0); |
bc7fd8cd | 1364 | |
455971c1 | 1365 | r = memfd_new(bus->description); |
9b05bc48 | 1366 | if (r < 0) |
73843b52 | 1367 | return r; |
bc7fd8cd LP |
1368 | |
1369 | *address = NULL; | |
8e959fbf LP |
1370 | *mapped = 0; |
1371 | *allocated = 0; | |
a6082d77 | 1372 | return r; |
bc7fd8cd LP |
1373 | } |
1374 | ||
bf30e48f | 1375 | c = &bus->memfd_cache[--bus->n_memfd_cache]; |
bc7fd8cd LP |
1376 | |
1377 | assert(c->fd >= 0); | |
8e959fbf | 1378 | assert(c->mapped == 0 || c->address); |
bc7fd8cd LP |
1379 | |
1380 | *address = c->address; | |
8e959fbf LP |
1381 | *mapped = c->mapped; |
1382 | *allocated = c->allocated; | |
45fbe937 LP |
1383 | fd = c->fd; |
1384 | ||
76b7742c | 1385 | assert_se(pthread_mutex_unlock(&bus->memfd_cache_mutex) >= 0); |
bc7fd8cd | 1386 | |
45fbe937 LP |
1387 | return fd; |
1388 | } | |
1389 | ||
1390 | static void close_and_munmap(int fd, void *address, size_t size) { | |
1391 | if (size > 0) | |
76b7742c | 1392 | assert_se(munmap(address, PAGE_ALIGN(size)) >= 0); |
45fbe937 | 1393 | |
03e334a1 | 1394 | safe_close(fd); |
bc7fd8cd LP |
1395 | } |
1396 | ||
8e959fbf | 1397 | void bus_kernel_push_memfd(sd_bus *bus, int fd, void *address, size_t mapped, size_t allocated) { |
bc7fd8cd | 1398 | struct memfd_cache *c; |
8e959fbf | 1399 | uint64_t max_mapped = PAGE_ALIGN(MEMFD_CACHE_ITEM_SIZE_MAX); |
bc7fd8cd LP |
1400 | |
1401 | assert(fd >= 0); | |
8e959fbf | 1402 | assert(mapped == 0 || address); |
bc7fd8cd | 1403 | |
45fbe937 | 1404 | if (!bus || !bus->is_kernel) { |
8e959fbf | 1405 | close_and_munmap(fd, address, mapped); |
45fbe937 LP |
1406 | return; |
1407 | } | |
1408 | ||
76b7742c | 1409 | assert_se(pthread_mutex_lock(&bus->memfd_cache_mutex) >= 0); |
bc7fd8cd | 1410 | |
45fbe937 | 1411 | if (bus->n_memfd_cache >= ELEMENTSOF(bus->memfd_cache)) { |
76b7742c | 1412 | assert_se(pthread_mutex_unlock(&bus->memfd_cache_mutex) >= 0); |
bc7fd8cd | 1413 | |
8e959fbf | 1414 | close_and_munmap(fd, address, mapped); |
bc7fd8cd LP |
1415 | return; |
1416 | } | |
1417 | ||
1418 | c = &bus->memfd_cache[bus->n_memfd_cache++]; | |
1419 | c->fd = fd; | |
1420 | c->address = address; | |
1421 | ||
1422 | /* If overly long, let's return a bit to the OS */ | |
8e959fbf | 1423 | if (mapped > max_mapped) { |
73843b52 | 1424 | assert_se(memfd_set_size(fd, max_mapped) >= 0); |
8e959fbf LP |
1425 | assert_se(munmap((uint8_t*) address + max_mapped, PAGE_ALIGN(mapped - max_mapped)) >= 0); |
1426 | c->mapped = c->allocated = max_mapped; | |
1427 | } else { | |
1428 | c->mapped = mapped; | |
1429 | c->allocated = allocated; | |
1430 | } | |
45fbe937 | 1431 | |
76b7742c | 1432 | assert_se(pthread_mutex_unlock(&bus->memfd_cache_mutex) >= 0); |
bc7fd8cd LP |
1433 | } |
1434 | ||
1435 | void bus_kernel_flush_memfd(sd_bus *b) { | |
1436 | unsigned i; | |
1437 | ||
1438 | assert(b); | |
1439 | ||
76b7742c | 1440 | for (i = 0; i < b->n_memfd_cache; i++) |
8e959fbf | 1441 | close_and_munmap(b->memfd_cache[i].fd, b->memfd_cache[i].address, b->memfd_cache[i].mapped); |
bc7fd8cd | 1442 | } |
0253ddcc | 1443 | |
b5dae4c7 | 1444 | uint64_t request_name_flags_to_kdbus(uint64_t flags) { |
e3dd987c | 1445 | uint64_t f = 0; |
0253ddcc | 1446 | |
e3dd987c LP |
1447 | if (flags & SD_BUS_NAME_ALLOW_REPLACEMENT) |
1448 | f |= KDBUS_NAME_ALLOW_REPLACEMENT; | |
0253ddcc | 1449 | |
e3dd987c LP |
1450 | if (flags & SD_BUS_NAME_REPLACE_EXISTING) |
1451 | f |= KDBUS_NAME_REPLACE_EXISTING; | |
0253ddcc | 1452 | |
d90bb669 | 1453 | if (flags & SD_BUS_NAME_QUEUE) |
e3dd987c | 1454 | f |= KDBUS_NAME_QUEUE; |
0253ddcc | 1455 | |
b5dae4c7 | 1456 | return f; |
e3dd987c LP |
1457 | } |
1458 | ||
b5dae4c7 | 1459 | uint64_t attach_flags_to_kdbus(uint64_t mask) { |
e3dd987c LP |
1460 | uint64_t m = 0; |
1461 | ||
705a415f LP |
1462 | if (mask & (SD_BUS_CREDS_UID|SD_BUS_CREDS_EUID|SD_BUS_CREDS_SUID|SD_BUS_CREDS_FSUID| |
1463 | SD_BUS_CREDS_GID|SD_BUS_CREDS_EGID|SD_BUS_CREDS_SGID|SD_BUS_CREDS_FSGID)) | |
e3dd987c LP |
1464 | m |= KDBUS_ATTACH_CREDS; |
1465 | ||
32802361 | 1466 | if (mask & (SD_BUS_CREDS_PID|SD_BUS_CREDS_TID)) |
705a415f LP |
1467 | m |= KDBUS_ATTACH_PIDS; |
1468 | ||
a2243d54 DM |
1469 | if (mask & SD_BUS_CREDS_COMM) |
1470 | m |= KDBUS_ATTACH_PID_COMM; | |
1471 | ||
1472 | if (mask & SD_BUS_CREDS_TID_COMM) | |
1473 | m |= KDBUS_ATTACH_TID_COMM; | |
e3dd987c LP |
1474 | |
1475 | if (mask & SD_BUS_CREDS_EXE) | |
1476 | m |= KDBUS_ATTACH_EXE; | |
1477 | ||
1478 | if (mask & SD_BUS_CREDS_CMDLINE) | |
1479 | m |= KDBUS_ATTACH_CMDLINE; | |
1480 | ||
1481 | if (mask & (SD_BUS_CREDS_CGROUP|SD_BUS_CREDS_UNIT|SD_BUS_CREDS_USER_UNIT|SD_BUS_CREDS_SLICE|SD_BUS_CREDS_SESSION|SD_BUS_CREDS_OWNER_UID)) | |
1482 | m |= KDBUS_ATTACH_CGROUP; | |
1483 | ||
1484 | if (mask & (SD_BUS_CREDS_EFFECTIVE_CAPS|SD_BUS_CREDS_PERMITTED_CAPS|SD_BUS_CREDS_INHERITABLE_CAPS|SD_BUS_CREDS_BOUNDING_CAPS)) | |
1485 | m |= KDBUS_ATTACH_CAPS; | |
1486 | ||
1487 | if (mask & SD_BUS_CREDS_SELINUX_CONTEXT) | |
1488 | m |= KDBUS_ATTACH_SECLABEL; | |
0253ddcc | 1489 | |
e3dd987c LP |
1490 | if (mask & (SD_BUS_CREDS_AUDIT_SESSION_ID|SD_BUS_CREDS_AUDIT_LOGIN_UID)) |
1491 | m |= KDBUS_ATTACH_AUDIT; | |
1492 | ||
49b832c5 LP |
1493 | if (mask & SD_BUS_CREDS_WELL_KNOWN_NAMES) |
1494 | m |= KDBUS_ATTACH_NAMES; | |
1495 | ||
455971c1 | 1496 | if (mask & SD_BUS_CREDS_DESCRIPTION) |
635f9f0d | 1497 | m |= KDBUS_ATTACH_CONN_DESCRIPTION; |
cccb0b2c | 1498 | |
02581590 LP |
1499 | if (mask & SD_BUS_CREDS_SUPPLEMENTARY_GIDS) |
1500 | m |= KDBUS_ATTACH_AUXGROUPS; | |
1501 | ||
b5dae4c7 | 1502 | return m; |
0253ddcc | 1503 | } |
e3dd987c | 1504 | |
f2769777 | 1505 | int bus_kernel_create_bus(const char *name, bool world, char **s) { |
816a3f9e | 1506 | struct kdbus_cmd_make *make; |
e3dd987c | 1507 | struct kdbus_item *n; |
fa7796e9 | 1508 | size_t l; |
e3dd987c LP |
1509 | int fd; |
1510 | ||
1511 | assert(name); | |
1512 | assert(s); | |
1513 | ||
63cc4c31 | 1514 | fd = open("/sys/fs/kdbus/control", O_RDWR|O_NOCTTY|O_CLOEXEC); |
e3dd987c LP |
1515 | if (fd < 0) |
1516 | return -errno; | |
1517 | ||
fa7796e9 LP |
1518 | l = strlen(name); |
1519 | make = alloca0_align(offsetof(struct kdbus_cmd_make, items) + | |
1520 | ALIGN8(offsetof(struct kdbus_item, bloom_parameter) + sizeof(struct kdbus_bloom_parameter)) + | |
1521 | ALIGN8(offsetof(struct kdbus_item, data64) + sizeof(uint64_t)) + | |
19ee32dc | 1522 | ALIGN8(offsetof(struct kdbus_item, data64) + sizeof(uint64_t)) + |
fa7796e9 | 1523 | ALIGN8(offsetof(struct kdbus_item, str) + DECIMAL_STR_MAX(uid_t) + 1 + l + 1), |
7f3d3ba1 | 1524 | 8); |
e3dd987c | 1525 | |
816a3f9e DM |
1526 | make->size = offsetof(struct kdbus_cmd_make, items); |
1527 | ||
fa7796e9 | 1528 | /* Set the bloom parameters */ |
e3dd987c | 1529 | n = make->items; |
18a28147 KS |
1530 | n->size = offsetof(struct kdbus_item, bloom_parameter) + |
1531 | sizeof(struct kdbus_bloom_parameter); | |
1532 | n->type = KDBUS_ITEM_BLOOM_PARAMETER; | |
b28ff39f LP |
1533 | n->bloom_parameter.size = DEFAULT_BLOOM_SIZE; |
1534 | n->bloom_parameter.n_hash = DEFAULT_BLOOM_N_HASH; | |
1535 | ||
1536 | assert_cc(DEFAULT_BLOOM_SIZE > 0); | |
1537 | assert_cc(DEFAULT_BLOOM_N_HASH > 0); | |
1538 | ||
816a3f9e DM |
1539 | make->size += ALIGN8(n->size); |
1540 | ||
fa7796e9 LP |
1541 | /* The busses we create make no restrictions on what metadata |
1542 | * peers can read from incoming messages. */ | |
1543 | n = KDBUS_ITEM_NEXT(n); | |
1544 | n->type = KDBUS_ITEM_ATTACH_FLAGS_RECV; | |
1545 | n->size = offsetof(struct kdbus_item, data64) + sizeof(uint64_t); | |
19ee32dc DH |
1546 | n->data64[0] = _KDBUS_ATTACH_ANY; |
1547 | make->size += ALIGN8(n->size); | |
1548 | ||
1549 | /* Provide all metadata via bus-owner queries */ | |
1550 | n = KDBUS_ITEM_NEXT(n); | |
1551 | n->type = KDBUS_ITEM_ATTACH_FLAGS_SEND; | |
1552 | n->size = offsetof(struct kdbus_item, data64) + sizeof(uint64_t); | |
fa7796e9 LP |
1553 | n->data64[0] = _KDBUS_ATTACH_ANY; |
1554 | make->size += ALIGN8(n->size); | |
1555 | ||
1556 | /* Set the a good name */ | |
816a3f9e | 1557 | n = KDBUS_ITEM_NEXT(n); |
a4152e3f | 1558 | sprintf(n->str, UID_FMT "-%s", getuid(), name); |
e3dd987c | 1559 | n->size = offsetof(struct kdbus_item, str) + strlen(n->str) + 1; |
5e16c257 | 1560 | n->type = KDBUS_ITEM_MAKE_NAME; |
816a3f9e | 1561 | make->size += ALIGN8(n->size); |
e3dd987c | 1562 | |
f7c7cd03 | 1563 | make->flags = world ? KDBUS_MAKE_ACCESS_WORLD : 0; |
e3dd987c LP |
1564 | |
1565 | if (ioctl(fd, KDBUS_CMD_BUS_MAKE, make) < 0) { | |
03e334a1 | 1566 | safe_close(fd); |
e3dd987c LP |
1567 | return -errno; |
1568 | } | |
1569 | ||
1570 | if (s) { | |
1571 | char *p; | |
1572 | ||
63cc4c31 | 1573 | p = strjoin("/sys/fs/kdbus/", n->str, "/bus", NULL); |
e3dd987c | 1574 | if (!p) { |
03e334a1 | 1575 | safe_close(fd); |
e3dd987c LP |
1576 | return -ENOMEM; |
1577 | } | |
1578 | ||
1579 | *s = p; | |
1580 | } | |
1581 | ||
1582 | return fd; | |
1583 | } | |
9bd37b40 | 1584 | |
8f077bf9 | 1585 | int bus_kernel_open_bus_fd(const char *bus, char **path) { |
a4152e3f LP |
1586 | char *p; |
1587 | int fd; | |
8f077bf9 | 1588 | size_t len; |
1683342a | 1589 | |
8aee3fc7 LP |
1590 | assert(bus); |
1591 | ||
63cc4c31 | 1592 | len = strlen("/sys/fs/kdbus/") + DECIMAL_STR_MAX(uid_t) + 1 + strlen(bus) + strlen("/bus") + 1; |
8f077bf9 ZJS |
1593 | |
1594 | if (path) { | |
8aee3fc7 | 1595 | p = new(char, len); |
8f077bf9 ZJS |
1596 | if (!p) |
1597 | return -ENOMEM; | |
8f077bf9 | 1598 | } else |
8aee3fc7 LP |
1599 | p = newa(char, len); |
1600 | ||
63cc4c31 | 1601 | sprintf(p, "/sys/fs/kdbus/" UID_FMT "-%s/bus", getuid(), bus); |
1683342a | 1602 | |
a4152e3f | 1603 | fd = open(p, O_RDWR|O_NOCTTY|O_CLOEXEC); |
8aee3fc7 LP |
1604 | if (fd < 0) { |
1605 | if (path) | |
1606 | free(p); | |
1607 | ||
a4152e3f | 1608 | return -errno; |
8aee3fc7 LP |
1609 | } |
1610 | ||
1611 | if (path) | |
1612 | *path = p; | |
a4152e3f LP |
1613 | |
1614 | return fd; | |
1683342a DM |
1615 | } |
1616 | ||
e7d718af | 1617 | int bus_kernel_create_endpoint(const char *bus_name, const char *ep_name, char **ep_path) { |
8e00bfc2 | 1618 | _cleanup_free_ char *path = NULL; |
e7d718af DM |
1619 | struct kdbus_cmd_make *make; |
1620 | struct kdbus_item *n; | |
342f3005 | 1621 | const char *name; |
e7d718af DM |
1622 | int fd; |
1623 | ||
1624 | fd = bus_kernel_open_bus_fd(bus_name, &path); | |
1625 | if (fd < 0) | |
1626 | return fd; | |
1627 | ||
342f3005 DH |
1628 | make = alloca0_align(ALIGN8(offsetof(struct kdbus_cmd_make, items)) + |
1629 | ALIGN8(offsetof(struct kdbus_item, str) + DECIMAL_STR_MAX(uid_t) + 1 + strlen(ep_name) + 1), | |
1630 | 8); | |
1631 | make->size = ALIGN8(offsetof(struct kdbus_cmd_make, items)); | |
e7d718af DM |
1632 | make->flags = KDBUS_MAKE_ACCESS_WORLD; |
1633 | ||
1634 | n = make->items; | |
342f3005 DH |
1635 | sprintf(n->str, UID_FMT "-%s", getuid(), ep_name); |
1636 | n->size = offsetof(struct kdbus_item, str) + strlen(n->str) + 1; | |
e7d718af | 1637 | n->type = KDBUS_ITEM_MAKE_NAME; |
342f3005 DH |
1638 | make->size += ALIGN8(n->size); |
1639 | name = n->str; | |
e7d718af | 1640 | |
40885bb2 | 1641 | if (ioctl(fd, KDBUS_CMD_ENDPOINT_MAKE, make) < 0) { |
e7d718af DM |
1642 | safe_close(fd); |
1643 | return -errno; | |
1644 | } | |
1645 | ||
e7d718af | 1646 | if (ep_path) { |
2c652b6b LP |
1647 | char *p; |
1648 | ||
342f3005 | 1649 | p = strjoin(dirname(path), "/", name, NULL); |
2c652b6b | 1650 | if (!p) { |
4edf33d1 | 1651 | safe_close(fd); |
e7d718af | 1652 | return -ENOMEM; |
4edf33d1 | 1653 | } |
2c652b6b LP |
1654 | |
1655 | *ep_path = p; | |
e7d718af DM |
1656 | } |
1657 | ||
1658 | return fd; | |
1659 | } | |
1660 | ||
ae095f86 LP |
1661 | int bus_kernel_try_close(sd_bus *bus) { |
1662 | assert(bus); | |
1663 | assert(bus->is_kernel); | |
1664 | ||
1665 | if (ioctl(bus->input_fd, KDBUS_CMD_BYEBYE) < 0) | |
1666 | return -errno; | |
1667 | ||
1668 | return 0; | |
1669 | } | |
ff975efb LP |
1670 | |
1671 | int bus_kernel_drop_one(int fd) { | |
1672 | struct kdbus_cmd_recv recv = { | |
94e15fdc DH |
1673 | .size = sizeof(recv), |
1674 | .flags = KDBUS_RECV_DROP, | |
ff975efb LP |
1675 | }; |
1676 | ||
1677 | assert(fd >= 0); | |
1678 | ||
94e15fdc | 1679 | if (ioctl(fd, KDBUS_CMD_RECV, &recv) < 0) |
ff975efb LP |
1680 | return -errno; |
1681 | ||
1682 | return 0; | |
1683 | } | |
b5dae4c7 LP |
1684 | |
1685 | int bus_kernel_realize_attach_flags(sd_bus *bus) { | |
1686 | struct kdbus_cmd_update *update; | |
1687 | struct kdbus_item *n; | |
1688 | ||
1689 | assert(bus); | |
1690 | assert(bus->is_kernel); | |
1691 | ||
fa7796e9 LP |
1692 | update = alloca0_align(offsetof(struct kdbus_cmd_update, items) + |
1693 | ALIGN8(offsetof(struct kdbus_item, data64) + sizeof(uint64_t)), | |
1694 | 8); | |
b5dae4c7 LP |
1695 | |
1696 | n = update->items; | |
1697 | n->type = KDBUS_ITEM_ATTACH_FLAGS_RECV; | |
1698 | n->size = offsetof(struct kdbus_item, data64) + sizeof(uint64_t); | |
1699 | n->data64[0] = bus->attach_flags; | |
1700 | ||
fa7796e9 LP |
1701 | update->size = |
1702 | offsetof(struct kdbus_cmd_update, items) + | |
1703 | ALIGN8(n->size); | |
b5dae4c7 LP |
1704 | |
1705 | if (ioctl(bus->input_fd, KDBUS_CMD_CONN_UPDATE, update) < 0) | |
1706 | return -errno; | |
1707 | ||
1708 | return 0; | |
1709 | } | |
1a299299 LP |
1710 | |
1711 | int bus_kernel_fix_attach_mask(void) { | |
1712 | _cleanup_free_ char *mask = NULL; | |
412c18f1 | 1713 | uint64_t m = (uint64_t) -1; |
1a299299 LP |
1714 | char buf[2+16+2]; |
1715 | int r; | |
1716 | ||
412c18f1 LP |
1717 | /* By default we don't want any kdbus metadata fields to be |
1718 | * suppressed, hence we reset the kernel mask for it to | |
1719 | * (uint64_t) -1. This is overridable via a kernel command | |
1720 | * line option, however. */ | |
1721 | ||
1a299299 | 1722 | r = get_proc_cmdline_key("systemd.kdbus_attach_flags_mask=", &mask); |
1214b53c LP |
1723 | if (r < 0) |
1724 | return log_warning_errno(r, "Failed to read kernel command line: %m"); | |
1a299299 LP |
1725 | |
1726 | if (mask) { | |
1727 | const char *p = mask; | |
1728 | ||
1729 | if (startswith(p, "0x")) | |
1730 | p += 2; | |
1731 | ||
1732 | if (sscanf(p, "%" PRIx64, &m) != 1) | |
1733 | log_warning("Couldn't parse systemd.kdbus_attach_flags_mask= kernel command line parameter."); | |
1734 | } | |
1735 | ||
1736 | sprintf(buf, "0x%" PRIx64 "\n", m); | |
1737 | r = write_string_file("/sys/module/kdbus/parameters/attach_flags_mask", buf); | |
1214b53c LP |
1738 | if (r < 0) |
1739 | return log_full_errno( | |
cb01aedc | 1740 | IN_SET(r, -ENOENT, -EROFS) ? LOG_DEBUG : LOG_WARNING, r, |
1214b53c | 1741 | "Failed to write kdbus attach mask: %m"); |
1a299299 LP |
1742 | |
1743 | return 0; | |
1744 | } | |
3acc1daf LP |
1745 | |
1746 | int bus_kernel_get_bus_name(sd_bus *bus, char **name) { | |
1747 | struct kdbus_cmd_info cmd = { | |
1748 | .size = sizeof(struct kdbus_cmd_info), | |
1749 | }; | |
1750 | struct kdbus_info *info; | |
1751 | struct kdbus_item *item; | |
1752 | char *n = NULL; | |
1753 | int r; | |
1754 | ||
1755 | assert(bus); | |
1756 | assert(name); | |
1757 | assert(bus->is_kernel); | |
1758 | ||
1759 | r = ioctl(bus->input_fd, KDBUS_CMD_BUS_CREATOR_INFO, &cmd); | |
1760 | if (r < 0) | |
1761 | return -errno; | |
1762 | ||
1763 | info = (struct kdbus_info*) ((uint8_t*) bus->kdbus_buffer + cmd.offset); | |
1764 | ||
1765 | KDBUS_ITEM_FOREACH(item, info, items) | |
1766 | if (item->type == KDBUS_ITEM_MAKE_NAME) { | |
1767 | r = free_and_strdup(&n, item->str); | |
1768 | break; | |
1769 | } | |
1770 | ||
1771 | bus_kernel_cmd_free(bus, cmd.offset); | |
1772 | ||
1773 | if (r < 0) | |
1774 | return r; | |
1775 | if (!n) | |
1776 | return -EIO; | |
1777 | ||
1778 | *name = n; | |
1779 | return 0; | |
1780 | } |