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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 | 298 | ((m->header->flags & BUS_MESSAGE_NO_REPLY_EXPECTED) ? 0 : KDBUS_MSG_EXPECT_REPLY) | |
d7d052b2 DM |
299 | ((m->header->flags & BUS_MESSAGE_NO_AUTO_START) ? KDBUS_MSG_NO_AUTO_START : 0) | |
300 | ((m->header->type == SD_BUS_MESSAGE_SIGNAL) ? KDBUS_MSG_SIGNAL : 0); | |
022fb855 | 301 | |
7fa934b0 | 302 | if (well_known) |
022fb855 DM |
303 | /* verify_destination_id will usually be 0, which makes the kernel driver only look |
304 | * at the provided well-known name. Otherwise, the kernel will make sure the provided | |
305 | * destination id matches the owner of the provided weel-known-name, and fail if they | |
306 | * differ. Currently, this is only needed for bus-proxyd. */ | |
307 | m->kdbus->dst_id = m->verify_destination_id; | |
7fa934b0 | 308 | else |
022fb855 | 309 | m->kdbus->dst_id = destination ? unique : KDBUS_DST_ID_BROADCAST; |
022fb855 | 310 | |
6647dc66 | 311 | m->kdbus->payload_type = KDBUS_PAYLOAD_DBUS; |
42c4ebcb | 312 | m->kdbus->cookie = (uint64_t) m->header->serial; |
ca7b42c8 | 313 | m->kdbus->priority = m->priority; |
80a33f11 | 314 | |
7fa934b0 | 315 | if (m->header->flags & BUS_MESSAGE_NO_REPLY_EXPECTED) |
693eb9a2 | 316 | m->kdbus->cookie_reply = m->reply_cookie; |
7fa934b0 | 317 | else { |
03785ad0 DM |
318 | struct timespec now; |
319 | ||
b680a194 | 320 | assert_se(clock_gettime(CLOCK_MONOTONIC_COARSE, &now) == 0); |
03785ad0 DM |
321 | m->kdbus->timeout_ns = now.tv_sec * NSEC_PER_SEC + now.tv_nsec + |
322 | m->timeout * NSEC_PER_USEC; | |
323 | } | |
6629161f | 324 | |
b1454bf0 | 325 | d = m->kdbus->items; |
6629161f LP |
326 | |
327 | if (well_known) | |
022fb855 | 328 | append_destination(&d, destination, dl); |
6629161f | 329 | |
c91cb83c | 330 | append_payload_vec(&d, m->header, BUS_MESSAGE_BODY_BEGIN(m)); |
a392d361 LP |
331 | |
332 | MESSAGE_FOREACH_PART(part, i, m) { | |
333 | if (part->is_zero) { | |
66b26c5c LP |
334 | /* If this is padding then simply send a |
335 | * vector with a NULL data pointer which the | |
336 | * kernel will just pass through. This is the | |
337 | * most efficient way to encode zeroes */ | |
338 | ||
a392d361 LP |
339 | append_payload_vec(&d, NULL, part->size); |
340 | continue; | |
341 | } | |
342 | ||
022fb855 | 343 | if (part->memfd >= 0 && part->sealed && destination) { |
66b26c5c LP |
344 | /* Try to send a memfd, if the part is |
345 | * sealed and this is not a broadcast. Since we can only */ | |
a392d361 | 346 | |
77adde63 | 347 | append_payload_memfd(&d, part->memfd, part->memfd_offset, part->size); |
66b26c5c | 348 | continue; |
a392d361 LP |
349 | } |
350 | ||
73e231ab JE |
351 | /* Otherwise, let's send a vector to the actual data. |
352 | * For that, we need to map it first. */ | |
66b26c5c LP |
353 | r = bus_body_part_map(part); |
354 | if (r < 0) | |
355 | goto fail; | |
a392d361 | 356 | |
bc7fd8cd | 357 | append_payload_vec(&d, part->data, part->size); |
a392d361 | 358 | } |
6629161f | 359 | |
7ce98121 | 360 | if (m->header->type == SD_BUS_MESSAGE_SIGNAL) { |
18a28147 | 361 | struct kdbus_bloom_filter *bloom; |
5b7d4c1c | 362 | |
b28ff39f | 363 | bloom = append_bloom(&d, m->bus->bloom_size); |
18a28147 | 364 | r = bus_message_setup_bloom(m, bloom); |
a392d361 LP |
365 | if (r < 0) |
366 | goto fail; | |
5b7d4c1c | 367 | } |
b5baa8fe | 368 | |
9097fe29 LP |
369 | if (m->n_fds > 0) |
370 | append_fds(&d, m->fds, m->n_fds); | |
371 | ||
e9a967f9 | 372 | m->kdbus->size = (uint8_t*) d - (uint8_t*) m->kdbus; |
6629161f LP |
373 | assert(m->kdbus->size <= sz); |
374 | ||
375 | return 0; | |
a392d361 LP |
376 | |
377 | fail: | |
66b26c5c | 378 | m->poisoned = true; |
a392d361 | 379 | return r; |
6629161f LP |
380 | } |
381 | ||
125dd074 ZJS |
382 | static void unset_memfds(struct sd_bus_message *m) { |
383 | struct bus_body_part *part; | |
384 | unsigned i; | |
385 | ||
386 | assert(m); | |
387 | ||
388 | /* Make sure the memfds are not freed twice */ | |
389 | MESSAGE_FOREACH_PART(part, i, m) | |
390 | if (part->memfd >= 0) | |
391 | part->memfd = -1; | |
392 | } | |
393 | ||
76877fb9 LP |
394 | static void message_set_timestamp(sd_bus *bus, sd_bus_message *m, const struct kdbus_timestamp *ts) { |
395 | assert(bus); | |
396 | assert(m); | |
397 | ||
398 | if (!ts) | |
399 | return; | |
400 | ||
401 | if (!(bus->attach_flags & KDBUS_ATTACH_TIMESTAMP)) | |
402 | return; | |
403 | ||
404 | m->realtime = ts->realtime_ns / NSEC_PER_USEC; | |
405 | m->monotonic = ts->monotonic_ns / NSEC_PER_USEC; | |
406 | m->seqnum = ts->seqnum; | |
407 | } | |
408 | ||
cb67f718 DM |
409 | static int bus_kernel_make_message(sd_bus *bus, struct kdbus_msg *k) { |
410 | sd_bus_message *m = NULL; | |
411 | struct kdbus_item *d; | |
412 | unsigned n_fds = 0; | |
413 | _cleanup_free_ int *fds = NULL; | |
414 | struct bus_header *h = NULL; | |
415 | size_t total, n_bytes = 0, idx = 0; | |
416 | const char *destination = NULL, *seclabel = NULL; | |
6629161f LP |
417 | int r; |
418 | ||
cb67f718 DM |
419 | assert(bus); |
420 | assert(k); | |
421 | assert(k->payload_type == KDBUS_PAYLOAD_DBUS); | |
35460afc | 422 | |
cb67f718 DM |
423 | KDBUS_ITEM_FOREACH(d, k, items) { |
424 | size_t l; | |
f08838da | 425 | |
cb67f718 | 426 | l = d->size - offsetof(struct kdbus_item, data); |
8f155917 | 427 | |
cb67f718 | 428 | switch (d->type) { |
62b3e928 | 429 | |
cb67f718 DM |
430 | case KDBUS_ITEM_PAYLOAD_OFF: |
431 | if (!h) { | |
840ceb89 | 432 | h = (struct bus_header *)((uint8_t *)bus->kdbus_buffer + d->vec.offset); |
8a0e0ed9 | 433 | |
cb67f718 DM |
434 | if (!bus_header_is_complete(h, d->vec.size)) |
435 | return -EBADMSG; | |
436 | } | |
8a0e0ed9 | 437 | |
cb67f718 DM |
438 | n_bytes += d->vec.size; |
439 | break; | |
8a0e0ed9 | 440 | |
cb67f718 DM |
441 | case KDBUS_ITEM_PAYLOAD_MEMFD: |
442 | if (!h) | |
443 | return -EBADMSG; | |
8a0e0ed9 | 444 | |
cb67f718 DM |
445 | n_bytes += d->memfd.size; |
446 | break; | |
8a0e0ed9 | 447 | |
cb67f718 DM |
448 | case KDBUS_ITEM_FDS: { |
449 | int *f; | |
450 | unsigned j; | |
8a0e0ed9 | 451 | |
cb67f718 DM |
452 | j = l / sizeof(int); |
453 | f = realloc(fds, sizeof(int) * (n_fds + j)); | |
454 | if (!f) | |
455 | return -ENOMEM; | |
8a0e0ed9 | 456 | |
cb67f718 DM |
457 | fds = f; |
458 | memcpy(fds + n_fds, d->fds, sizeof(int) * j); | |
459 | n_fds += j; | |
460 | break; | |
461 | } | |
62b3e928 | 462 | |
cb67f718 DM |
463 | case KDBUS_ITEM_SECLABEL: |
464 | seclabel = d->str; | |
465 | break; | |
fd8d62d9 LP |
466 | } |
467 | } | |
468 | ||
cb67f718 DM |
469 | if (!h) |
470 | return -EBADMSG; | |
de297575 | 471 | |
cb67f718 DM |
472 | r = bus_header_message_size(h, &total); |
473 | if (r < 0) | |
474 | return r; | |
219728b3 | 475 | |
cb67f718 DM |
476 | if (n_bytes != total) |
477 | return -EBADMSG; | |
6629161f | 478 | |
cb67f718 DM |
479 | /* on kdbus we only speak native endian gvariant, never dbus1 |
480 | * marshalling or reverse endian */ | |
481 | if (h->version != 2 || | |
482 | h->endian != BUS_NATIVE_ENDIAN) | |
483 | return -EPROTOTYPE; | |
c58dea19 | 484 | |
cb67f718 DM |
485 | r = bus_message_from_header(bus, h, sizeof(struct bus_header), fds, n_fds, NULL, seclabel, 0, &m); |
486 | if (r < 0) | |
487 | return r; | |
6629161f | 488 | |
cb67f718 DM |
489 | /* The well-known names list is different from the other |
490 | credentials. If we asked for it, but nothing is there, this | |
491 | means that the list of well-known names is simply empty, not | |
492 | that we lack any data */ | |
35460afc | 493 | |
cb67f718 | 494 | m->creds.mask |= (SD_BUS_CREDS_UNIQUE_NAME|SD_BUS_CREDS_WELL_KNOWN_NAMES) & bus->creds_mask; |
f08838da | 495 | |
cb67f718 DM |
496 | KDBUS_ITEM_FOREACH(d, k, items) { |
497 | size_t l; | |
6629161f | 498 | |
cb67f718 | 499 | l = d->size - offsetof(struct kdbus_item, data); |
6629161f | 500 | |
cb67f718 | 501 | switch (d->type) { |
6629161f | 502 | |
cb67f718 DM |
503 | case KDBUS_ITEM_PAYLOAD_OFF: { |
504 | size_t begin_body; | |
6629161f | 505 | |
cb67f718 | 506 | begin_body = BUS_MESSAGE_BODY_BEGIN(m); |
6629161f | 507 | |
cb67f718 DM |
508 | if (idx + d->vec.size > begin_body) { |
509 | struct bus_body_part *part; | |
a43b9ca3 | 510 | |
cb67f718 | 511 | /* Contains body material */ |
6629161f | 512 | |
cb67f718 DM |
513 | part = message_append_part(m); |
514 | if (!part) { | |
515 | r = -ENOMEM; | |
516 | goto fail; | |
517 | } | |
a43b9ca3 | 518 | |
cb67f718 DM |
519 | /* A -1 offset is NUL padding. */ |
520 | part->is_zero = d->vec.offset == ~0ULL; | |
a43b9ca3 | 521 | |
cb67f718 DM |
522 | if (idx >= begin_body) { |
523 | if (!part->is_zero) | |
840ceb89 | 524 | part->data = (uint8_t *)bus->kdbus_buffer + d->vec.offset; |
cb67f718 DM |
525 | part->size = d->vec.size; |
526 | } else { | |
527 | if (!part->is_zero) | |
840ceb89 | 528 | part->data = (uint8_t *)bus->kdbus_buffer + d->vec.offset + (begin_body - idx); |
cb67f718 DM |
529 | part->size = d->vec.size - (begin_body - idx); |
530 | } | |
a43b9ca3 | 531 | |
cb67f718 | 532 | part->sealed = true; |
ff4994c5 | 533 | } |
a43b9ca3 | 534 | |
cb67f718 DM |
535 | idx += d->vec.size; |
536 | break; | |
537 | } | |
a43b9ca3 | 538 | |
cb67f718 DM |
539 | case KDBUS_ITEM_PAYLOAD_MEMFD: { |
540 | struct bus_body_part *part; | |
a43b9ca3 | 541 | |
cb67f718 DM |
542 | if (idx < BUS_MESSAGE_BODY_BEGIN(m)) { |
543 | r = -EBADMSG; | |
544 | goto fail; | |
ff4994c5 | 545 | } |
a43b9ca3 | 546 | |
cb67f718 DM |
547 | part = message_append_part(m); |
548 | if (!part) { | |
549 | r = -ENOMEM; | |
550 | goto fail; | |
551 | } | |
a43b9ca3 | 552 | |
cb67f718 | 553 | part->memfd = d->memfd.fd; |
77adde63 | 554 | part->memfd_offset = d->memfd.start; |
cb67f718 DM |
555 | part->size = d->memfd.size; |
556 | part->sealed = true; | |
a43b9ca3 | 557 | |
cb67f718 DM |
558 | idx += d->memfd.size; |
559 | break; | |
560 | } | |
a43b9ca3 | 561 | |
705a415f LP |
562 | case KDBUS_ITEM_PIDS: |
563 | ||
32802361 LP |
564 | /* The PID/TID might be missing, when the data |
565 | * is faked by some data bus proxy and it | |
566 | * lacks that information about the real | |
567 | * client since SO_PEERCRED is used for | |
568 | * that. */ | |
705a415f LP |
569 | |
570 | if (d->pids.pid > 0) { | |
571 | m->creds.pid = (pid_t) d->pids.pid; | |
572 | m->creds.mask |= SD_BUS_CREDS_PID & bus->creds_mask; | |
573 | } | |
574 | ||
705a415f LP |
575 | if (d->pids.tid > 0) { |
576 | m->creds.tid = (pid_t) d->pids.tid; | |
cb67f718 DM |
577 | m->creds.mask |= SD_BUS_CREDS_TID & bus->creds_mask; |
578 | } | |
705a415f LP |
579 | |
580 | break; | |
581 | ||
582 | case KDBUS_ITEM_CREDS: | |
583 | ||
584 | /* EUID/SUID/FSUID/EGID/SGID/FSGID might be missing too (see above). */ | |
585 | ||
fed1e721 | 586 | if ((uid_t) d->creds.uid != UID_INVALID) { |
705a415f LP |
587 | m->creds.uid = (uid_t) d->creds.uid; |
588 | m->creds.mask |= SD_BUS_CREDS_UID & bus->creds_mask; | |
589 | } | |
590 | ||
fed1e721 | 591 | if ((uid_t) d->creds.euid != UID_INVALID) { |
705a415f LP |
592 | m->creds.euid = (uid_t) d->creds.euid; |
593 | m->creds.mask |= SD_BUS_CREDS_EUID & bus->creds_mask; | |
594 | } | |
595 | ||
fed1e721 | 596 | if ((uid_t) d->creds.suid != UID_INVALID) { |
705a415f LP |
597 | m->creds.suid = (uid_t) d->creds.suid; |
598 | m->creds.mask |= SD_BUS_CREDS_SUID & bus->creds_mask; | |
599 | } | |
600 | ||
fed1e721 | 601 | if ((uid_t) d->creds.fsuid != UID_INVALID) { |
705a415f LP |
602 | m->creds.fsuid = (uid_t) d->creds.fsuid; |
603 | m->creds.mask |= SD_BUS_CREDS_FSUID & bus->creds_mask; | |
604 | } | |
605 | ||
fed1e721 | 606 | if ((gid_t) d->creds.gid != GID_INVALID) { |
705a415f LP |
607 | m->creds.gid = (gid_t) d->creds.gid; |
608 | m->creds.mask |= SD_BUS_CREDS_GID & bus->creds_mask; | |
609 | } | |
610 | ||
fed1e721 | 611 | if ((gid_t) d->creds.egid != GID_INVALID) { |
705a415f LP |
612 | m->creds.egid = (gid_t) d->creds.egid; |
613 | m->creds.mask |= SD_BUS_CREDS_EGID & bus->creds_mask; | |
614 | } | |
615 | ||
fed1e721 | 616 | if ((gid_t) d->creds.sgid != GID_INVALID) { |
705a415f LP |
617 | m->creds.sgid = (gid_t) d->creds.sgid; |
618 | m->creds.mask |= SD_BUS_CREDS_SGID & bus->creds_mask; | |
619 | } | |
620 | ||
fed1e721 | 621 | if ((gid_t) d->creds.fsgid != GID_INVALID) { |
705a415f LP |
622 | m->creds.fsgid = (gid_t) d->creds.fsgid; |
623 | m->creds.mask |= SD_BUS_CREDS_FSGID & bus->creds_mask; | |
624 | } | |
625 | ||
cb67f718 | 626 | break; |
6629161f | 627 | |
cb67f718 | 628 | case KDBUS_ITEM_TIMESTAMP: |
76877fb9 | 629 | message_set_timestamp(bus, m, &d->timestamp); |
cb67f718 | 630 | break; |
fd8d62d9 | 631 | |
cb67f718 DM |
632 | case KDBUS_ITEM_PID_COMM: |
633 | m->creds.comm = d->str; | |
634 | m->creds.mask |= SD_BUS_CREDS_COMM & bus->creds_mask; | |
635 | break; | |
fd8d62d9 | 636 | |
cb67f718 DM |
637 | case KDBUS_ITEM_TID_COMM: |
638 | m->creds.tid_comm = d->str; | |
639 | m->creds.mask |= SD_BUS_CREDS_TID_COMM & bus->creds_mask; | |
640 | break; | |
6629161f | 641 | |
cb67f718 DM |
642 | case KDBUS_ITEM_EXE: |
643 | m->creds.exe = d->str; | |
644 | m->creds.mask |= SD_BUS_CREDS_EXE & bus->creds_mask; | |
645 | break; | |
6629161f | 646 | |
cb67f718 DM |
647 | case KDBUS_ITEM_CMDLINE: |
648 | m->creds.cmdline = d->str; | |
649 | m->creds.cmdline_size = l; | |
650 | m->creds.mask |= SD_BUS_CREDS_CMDLINE & bus->creds_mask; | |
651 | break; | |
777d7a61 | 652 | |
cb67f718 DM |
653 | case KDBUS_ITEM_CGROUP: |
654 | m->creds.cgroup = d->str; | |
655 | 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 | 656 | |
fe3f22d1 DK |
657 | r = bus_get_root_path(bus); |
658 | if (r < 0) | |
659 | goto fail; | |
777d7a61 | 660 | |
cb67f718 | 661 | m->creds.cgroup_root = bus->cgroup_root; |
777d7a61 | 662 | |
cb67f718 | 663 | break; |
777d7a61 | 664 | |
cb67f718 | 665 | case KDBUS_ITEM_AUDIT: |
6dfcc64b LP |
666 | if ((uint32_t) d->audit.sessionid != (uint32_t) -1) { |
667 | m->creds.audit_session_id = (uint32_t) d->audit.sessionid; | |
668 | m->creds.mask |= SD_BUS_CREDS_AUDIT_SESSION_ID & bus->creds_mask; | |
669 | } | |
670 | ||
fed1e721 | 671 | if ((uid_t) d->audit.loginuid != UID_INVALID) { |
6dfcc64b LP |
672 | m->creds.audit_login_uid = (uid_t) d->audit.loginuid; |
673 | m->creds.mask |= SD_BUS_CREDS_AUDIT_LOGIN_UID & bus->creds_mask; | |
674 | } | |
cb67f718 | 675 | break; |
777d7a61 | 676 | |
cb67f718 | 677 | case KDBUS_ITEM_CAPS: |
34a5d5e5 DH |
678 | if (d->caps.last_cap != cap_last_cap() || |
679 | d->size - offsetof(struct kdbus_item, caps.caps) < DIV_ROUND_UP(d->caps.last_cap, 32U) * 4 * 4) { | |
680 | r = -EBADMSG; | |
681 | goto fail; | |
682 | } | |
683 | ||
7d9fcc2b | 684 | m->creds.capability = d->caps.caps; |
cb67f718 DM |
685 | 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; |
686 | break; | |
219728b3 | 687 | |
cb67f718 | 688 | case KDBUS_ITEM_DST_NAME: |
9f6dfd06 LP |
689 | if (!service_name_is_valid(d->str)) { |
690 | r = -EBADMSG; | |
691 | goto fail; | |
692 | } | |
219728b3 | 693 | |
cb67f718 DM |
694 | destination = d->str; |
695 | break; | |
777d7a61 | 696 | |
635f9f0d | 697 | case KDBUS_ITEM_OWNED_NAME: |
9f6dfd06 LP |
698 | if (!service_name_is_valid(d->name.name)) { |
699 | r = -EBADMSG; | |
cb67f718 | 700 | goto fail; |
9f6dfd06 LP |
701 | } |
702 | ||
703 | if (bus->creds_mask & SD_BUS_CREDS_WELL_KNOWN_NAMES) { | |
50c45216 LP |
704 | char **wkn; |
705 | size_t n; | |
706 | ||
707 | /* We just extend the array here, but | |
708 | * do not allocate the strings inside | |
709 | * of it, instead we just point to our | |
710 | * buffer directly. */ | |
711 | n = strv_length(m->creds.well_known_names); | |
712 | wkn = realloc(m->creds.well_known_names, (n + 2) * sizeof(char*)); | |
713 | if (!wkn) { | |
714 | r = -ENOMEM; | |
9f6dfd06 | 715 | goto fail; |
50c45216 LP |
716 | } |
717 | ||
718 | wkn[n] = d->name.name; | |
719 | wkn[n+1] = NULL; | |
720 | m->creds.well_known_names = wkn; | |
9f6dfd06 LP |
721 | |
722 | m->creds.mask |= SD_BUS_CREDS_WELL_KNOWN_NAMES; | |
723 | } | |
cb67f718 | 724 | break; |
777d7a61 | 725 | |
635f9f0d | 726 | case KDBUS_ITEM_CONN_DESCRIPTION: |
455971c1 LP |
727 | m->creds.description = d->str; |
728 | m->creds.mask |= SD_BUS_CREDS_DESCRIPTION & bus->creds_mask; | |
cccb0b2c LP |
729 | break; |
730 | ||
02581590 LP |
731 | case KDBUS_ITEM_AUXGROUPS: |
732 | ||
733 | if (bus->creds_mask & SD_BUS_CREDS_SUPPLEMENTARY_GIDS) { | |
e12d81ae | 734 | assert_cc(sizeof(gid_t) == sizeof(uint32_t)); |
02581590 | 735 | |
e12d81ae LP |
736 | m->creds.n_supplementary_gids = (d->size - offsetof(struct kdbus_item, data32)) / sizeof(uint32_t); |
737 | m->creds.supplementary_gids = (gid_t*) d->data32; | |
02581590 LP |
738 | m->creds.mask |= SD_BUS_CREDS_SUPPLEMENTARY_GIDS; |
739 | } | |
740 | ||
741 | break; | |
742 | ||
cb67f718 DM |
743 | case KDBUS_ITEM_FDS: |
744 | case KDBUS_ITEM_SECLABEL: | |
745 | break; | |
d78bf250 | 746 | |
cb67f718 DM |
747 | default: |
748 | log_debug("Got unknown field from kernel %llu", d->type); | |
749 | } | |
750 | } | |
d78bf250 | 751 | |
38ce47e2 LP |
752 | /* If we requested the list of well-known names to be appended |
753 | * and the sender had none no item for it will be | |
315a73d9 | 754 | * attached. However, this does *not* mean that the kernel |
38ce47e2 LP |
755 | * didn't want to provide this information to us. Hence, let's |
756 | * explicitly mark this information as available if it was | |
757 | * requested. */ | |
758 | m->creds.mask |= bus->creds_mask & SD_BUS_CREDS_WELL_KNOWN_NAMES; | |
759 | ||
cb67f718 DM |
760 | r = bus_message_parse_fields(m); |
761 | if (r < 0) | |
762 | goto fail; | |
777d7a61 | 763 | |
7fa934b0 LP |
764 | /* Refuse messages if kdbus and dbus1 cookie doesn't match up */ |
765 | if ((uint64_t) m->header->serial != k->cookie) { | |
766 | r = -EBADMSG; | |
767 | goto fail; | |
768 | } | |
769 | ||
770 | /* Refuse messages where the reply flag doesn't match up */ | |
94e15fdc | 771 | if (!(m->header->flags & BUS_MESSAGE_NO_REPLY_EXPECTED) != !!(k->flags & KDBUS_MSG_EXPECT_REPLY)) { |
7fa934b0 LP |
772 | r = -EBADMSG; |
773 | goto fail; | |
774 | } | |
775 | ||
776 | /* Refuse reply messages where the reply cookie doesn't match up */ | |
777 | if ((m->header->flags & BUS_MESSAGE_NO_REPLY_EXPECTED) && m->reply_cookie != k->cookie_reply) { | |
778 | r = -EBADMSG; | |
779 | goto fail; | |
780 | } | |
781 | ||
782 | /* Refuse messages where the autostart flag doesn't match up */ | |
94e15fdc | 783 | if (!(m->header->flags & BUS_MESSAGE_NO_AUTO_START) != !(k->flags & KDBUS_MSG_NO_AUTO_START)) { |
7fa934b0 LP |
784 | r = -EBADMSG; |
785 | goto fail; | |
786 | } | |
787 | ||
cb67f718 | 788 | /* Override information from the user header with data from the kernel */ |
7d31d924 LP |
789 | if (k->src_id == KDBUS_SRC_ID_KERNEL) |
790 | bus_message_set_sender_driver(bus, m); | |
791 | else { | |
cb67f718 DM |
792 | snprintf(m->sender_buffer, sizeof(m->sender_buffer), ":1.%llu", (unsigned long long) k->src_id); |
793 | m->sender = m->creds.unique_name = m->sender_buffer; | |
794 | } | |
777d7a61 | 795 | |
cb67f718 DM |
796 | if (destination) |
797 | m->destination = destination; | |
798 | else if (k->dst_id == KDBUS_DST_ID_BROADCAST) | |
799 | m->destination = NULL; | |
800 | else if (k->dst_id == KDBUS_DST_ID_NAME) | |
801 | m->destination = bus->unique_name; /* fill in unique name if the well-known name is missing */ | |
802 | else { | |
803 | snprintf(m->destination_buffer, sizeof(m->destination_buffer), ":1.%llu", (unsigned long long) k->dst_id); | |
804 | m->destination = m->destination_buffer; | |
805 | } | |
777d7a61 | 806 | |
cb67f718 DM |
807 | /* We take possession of the kmsg struct now */ |
808 | m->kdbus = k; | |
809 | m->release_kdbus = true; | |
810 | m->free_fds = true; | |
811 | fds = NULL; | |
777d7a61 | 812 | |
cb67f718 | 813 | bus->rqueue[bus->rqueue_size++] = m; |
777d7a61 | 814 | |
cb67f718 | 815 | return 1; |
777d7a61 | 816 | |
cb67f718 | 817 | fail: |
125dd074 ZJS |
818 | unset_memfds(m); |
819 | sd_bus_message_unref(m); | |
777d7a61 | 820 | |
cb67f718 DM |
821 | return r; |
822 | } | |
777d7a61 | 823 | |
cb67f718 | 824 | int bus_kernel_take_fd(sd_bus *b) { |
18ee085c DH |
825 | struct kdbus_cmd_free cmd_free = { |
826 | .size = sizeof(cmd_free), | |
827 | .flags = 0, | |
828 | }; | |
d31f486b | 829 | struct kdbus_bloom_parameter *bloom = NULL; |
cb67f718 | 830 | struct kdbus_cmd_hello *hello; |
d31f486b | 831 | struct kdbus_item_list *items; |
cb67f718 | 832 | struct kdbus_item *item; |
5972fe95 LP |
833 | _cleanup_free_ char *g = NULL; |
834 | const char *name; | |
835 | size_t l = 0, m = 0, sz; | |
cb67f718 | 836 | int r; |
777d7a61 | 837 | |
cb67f718 | 838 | assert(b); |
7adc46fc | 839 | |
cb67f718 DM |
840 | if (b->is_server) |
841 | return -EINVAL; | |
777d7a61 | 842 | |
cb67f718 | 843 | b->use_memfd = 1; |
777d7a61 | 844 | |
455971c1 LP |
845 | if (b->description) { |
846 | g = bus_label_escape(b->description); | |
5972fe95 LP |
847 | if (!g) |
848 | return -ENOMEM; | |
849 | ||
850 | name = g; | |
851 | } else { | |
852 | char pr[17] = {}; | |
853 | ||
854 | /* If no name is explicitly set, we'll include a hint | |
855 | * indicating the library implementation, a hint which | |
856 | * kind of bus this is and the thread name */ | |
857 | ||
858 | assert_se(prctl(PR_GET_NAME, (unsigned long) pr) >= 0); | |
859 | ||
860 | if (isempty(pr)) { | |
861 | name = b->is_system ? "sd-system" : | |
862 | b->is_user ? "sd-user" : "sd"; | |
863 | } else { | |
864 | _cleanup_free_ char *e = NULL; | |
865 | ||
a6278b88 | 866 | e = bus_label_escape(pr); |
5972fe95 LP |
867 | if (!e) |
868 | return -ENOMEM; | |
869 | ||
870 | g = strappend(b->is_system ? "sd-system-" : | |
871 | b->is_user ? "sd-user-" : "sd-", | |
872 | e); | |
873 | if (!g) | |
874 | return -ENOMEM; | |
875 | ||
876 | name = g; | |
877 | } | |
878 | ||
455971c1 LP |
879 | b->description = bus_label_unescape(name); |
880 | if (!b->description) | |
5972fe95 LP |
881 | return -ENOMEM; |
882 | } | |
883 | ||
884 | m = strlen(name); | |
885 | ||
886 | sz = ALIGN8(offsetof(struct kdbus_cmd_hello, items)) + | |
887 | ALIGN8(offsetof(struct kdbus_item, str) + m + 1); | |
777d7a61 | 888 | |
cb67f718 | 889 | if (b->fake_creds_valid) |
5972fe95 | 890 | sz += ALIGN8(offsetof(struct kdbus_item, creds) + sizeof(struct kdbus_creds)); |
777d7a61 | 891 | |
705a415f LP |
892 | if (b->fake_pids_valid) |
893 | sz += ALIGN8(offsetof(struct kdbus_item, pids) + sizeof(struct kdbus_pids)); | |
894 | ||
cb67f718 DM |
895 | if (b->fake_label) { |
896 | l = strlen(b->fake_label); | |
897 | sz += ALIGN8(offsetof(struct kdbus_item, str) + l + 1); | |
898 | } | |
777d7a61 | 899 | |
7f3d3ba1 | 900 | hello = alloca0_align(sz, 8); |
cb67f718 | 901 | hello->size = sz; |
bc75205c | 902 | hello->flags = b->hello_flags; |
6f5c810a | 903 | hello->attach_flags_send = _KDBUS_ATTACH_ANY; |
d704fda9 | 904 | hello->attach_flags_recv = b->attach_flags; |
cb67f718 | 905 | hello->pool_size = KDBUS_POOL_SIZE; |
777d7a61 | 906 | |
cb67f718 DM |
907 | item = hello->items; |
908 | ||
5972fe95 | 909 | item->size = offsetof(struct kdbus_item, str) + m + 1; |
635f9f0d | 910 | item->type = KDBUS_ITEM_CONN_DESCRIPTION; |
5972fe95 LP |
911 | memcpy(item->str, name, m + 1); |
912 | item = KDBUS_ITEM_NEXT(item); | |
913 | ||
cb67f718 DM |
914 | if (b->fake_creds_valid) { |
915 | item->size = offsetof(struct kdbus_item, creds) + sizeof(struct kdbus_creds); | |
916 | item->type = KDBUS_ITEM_CREDS; | |
917 | item->creds = b->fake_creds; | |
918 | ||
919 | item = KDBUS_ITEM_NEXT(item); | |
777d7a61 LP |
920 | } |
921 | ||
705a415f LP |
922 | if (b->fake_pids_valid) { |
923 | item->size = offsetof(struct kdbus_item, pids) + sizeof(struct kdbus_pids); | |
924 | item->type = KDBUS_ITEM_PIDS; | |
925 | item->pids = b->fake_pids; | |
926 | ||
927 | item = KDBUS_ITEM_NEXT(item); | |
928 | } | |
929 | ||
cb67f718 DM |
930 | if (b->fake_label) { |
931 | item->size = offsetof(struct kdbus_item, str) + l + 1; | |
5972fe95 | 932 | item->type = KDBUS_ITEM_SECLABEL; |
cb67f718 | 933 | memcpy(item->str, b->fake_label, l+1); |
777d7a61 LP |
934 | } |
935 | ||
cb67f718 DM |
936 | r = ioctl(b->input_fd, KDBUS_CMD_HELLO, hello); |
937 | if (r < 0) | |
938 | return -errno; | |
777d7a61 | 939 | |
cb67f718 DM |
940 | if (!b->kdbus_buffer) { |
941 | b->kdbus_buffer = mmap(NULL, KDBUS_POOL_SIZE, PROT_READ, MAP_SHARED, b->input_fd, 0); | |
942 | if (b->kdbus_buffer == MAP_FAILED) { | |
943 | b->kdbus_buffer = NULL; | |
d31f486b DH |
944 | r = -errno; |
945 | goto fail; | |
cb67f718 DM |
946 | } |
947 | } | |
6629161f | 948 | |
4a3e79e1 | 949 | /* The higher 32bit of the bus_flags fields are considered |
cb67f718 | 950 | * 'incompatible flags'. Refuse them all for now. */ |
d31f486b DH |
951 | if (hello->bus_flags > 0xFFFFFFFFULL) { |
952 | r = -ENOTSUP; | |
953 | goto fail; | |
954 | } | |
6629161f | 955 | |
d31f486b DH |
956 | /* extract bloom parameters from items */ |
957 | items = (void*)((uint8_t*)b->kdbus_buffer + hello->offset); | |
958 | KDBUS_ITEM_FOREACH(item, items, items) { | |
959 | switch (item->type) { | |
960 | case KDBUS_ITEM_BLOOM_PARAMETER: | |
961 | bloom = &item->bloom_parameter; | |
962 | break; | |
963 | } | |
964 | } | |
6629161f | 965 | |
d31f486b DH |
966 | if (!bloom || !bloom_validate_parameters((size_t) bloom->size, (unsigned) bloom->n_hash)) { |
967 | r = -ENOTSUP; | |
968 | goto fail; | |
969 | } | |
b28ff39f | 970 | |
d31f486b DH |
971 | b->bloom_size = (size_t) bloom->size; |
972 | b->bloom_n_hash = (unsigned) bloom->n_hash; | |
973 | ||
974 | if (asprintf(&b->unique_name, ":1.%llu", (unsigned long long) hello->id) < 0) { | |
975 | r = -ENOMEM; | |
976 | goto fail; | |
977 | } | |
6629161f | 978 | |
cb67f718 | 979 | b->unique_id = hello->id; |
6629161f | 980 | |
cb67f718 DM |
981 | b->is_kernel = true; |
982 | b->bus_client = true; | |
bc75205c | 983 | b->can_fds = !!(hello->flags & KDBUS_HELLO_ACCEPT_FD); |
cb67f718 DM |
984 | b->message_version = 2; |
985 | b->message_endian = BUS_NATIVE_ENDIAN; | |
c91cb83c | 986 | |
cb67f718 DM |
987 | /* the kernel told us the UUID of the underlying bus */ |
988 | memcpy(b->server_id.bytes, hello->id128, sizeof(b->server_id.bytes)); | |
6629161f | 989 | |
d31f486b DH |
990 | /* free returned items */ |
991 | (void) bus_kernel_cmd_free(b, hello->offset); | |
992 | ||
cb67f718 | 993 | return bus_start_running(b); |
d31f486b DH |
994 | |
995 | fail: | |
18ee085c DH |
996 | cmd_free.offset = hello->offset; |
997 | (void) ioctl(b->input_fd, KDBUS_CMD_FREE, &cmd_free); | |
d31f486b | 998 | return r; |
cb67f718 | 999 | } |
6629161f | 1000 | |
cb67f718 DM |
1001 | int bus_kernel_connect(sd_bus *b) { |
1002 | assert(b); | |
1003 | assert(b->input_fd < 0); | |
1004 | assert(b->output_fd < 0); | |
1005 | assert(b->kernel); | |
1307c3ff | 1006 | |
cb67f718 DM |
1007 | if (b->is_server) |
1008 | return -EINVAL; | |
1307c3ff | 1009 | |
cb67f718 DM |
1010 | b->input_fd = open(b->kernel, O_RDWR|O_NOCTTY|O_CLOEXEC); |
1011 | if (b->input_fd < 0) | |
1012 | return -errno; | |
6629161f | 1013 | |
cb67f718 | 1014 | b->output_fd = b->input_fd; |
6629161f | 1015 | |
cb67f718 DM |
1016 | return bus_kernel_take_fd(b); |
1017 | } | |
f9be01f3 | 1018 | |
52cfc037 LP |
1019 | int bus_kernel_cmd_free(sd_bus *bus, uint64_t offset) { |
1020 | struct kdbus_cmd_free cmd = { | |
d31f486b | 1021 | .size = sizeof(cmd), |
52cfc037 LP |
1022 | .flags = 0, |
1023 | .offset = offset, | |
1024 | }; | |
1025 | int r; | |
1026 | ||
1027 | assert(bus); | |
1028 | assert(bus->is_kernel); | |
1029 | ||
1030 | r = ioctl(bus->input_fd, KDBUS_CMD_FREE, &cmd); | |
1031 | if (r < 0) | |
1032 | return -errno; | |
1033 | ||
1034 | return 0; | |
1035 | } | |
1036 | ||
069f5e61 | 1037 | static void close_kdbus_msg(sd_bus *bus, struct kdbus_msg *k) { |
069f5e61 LP |
1038 | struct kdbus_item *d; |
1039 | ||
1040 | assert(bus); | |
1041 | assert(k); | |
1042 | ||
069f5e61 | 1043 | KDBUS_ITEM_FOREACH(d, k, items) { |
069f5e61 LP |
1044 | if (d->type == KDBUS_ITEM_FDS) |
1045 | close_many(d->fds, (d->size - offsetof(struct kdbus_item, fds)) / sizeof(int)); | |
1046 | else if (d->type == KDBUS_ITEM_PAYLOAD_MEMFD) | |
03e334a1 | 1047 | safe_close(d->memfd.fd); |
069f5e61 | 1048 | } |
ca794c8e | 1049 | |
52cfc037 | 1050 | bus_kernel_cmd_free(bus, (uint8_t*) k - (uint8_t*) bus->kdbus_buffer); |
069f5e61 LP |
1051 | } |
1052 | ||
1053 | int bus_kernel_write_message(sd_bus *bus, sd_bus_message *m, bool hint_sync_call) { | |
94e15fdc | 1054 | struct kdbus_cmd_send cmd = { }; |
cb67f718 | 1055 | int r; |
6629161f | 1056 | |
cb67f718 DM |
1057 | assert(bus); |
1058 | assert(m); | |
1059 | assert(bus->state == BUS_RUNNING); | |
6629161f | 1060 | |
cb67f718 DM |
1061 | /* If we can't deliver, we want room for the error message */ |
1062 | r = bus_rqueue_make_room(bus); | |
6629161f LP |
1063 | if (r < 0) |
1064 | return r; | |
1065 | ||
cb67f718 | 1066 | r = bus_message_setup_kmsg(bus, m); |
6629161f LP |
1067 | if (r < 0) |
1068 | return r; | |
1069 | ||
94e15fdc DH |
1070 | cmd.size = sizeof(cmd); |
1071 | cmd.msg_address = (uintptr_t)m->kdbus; | |
1072 | ||
069f5e61 LP |
1073 | /* If this is a synchronous method call, then let's tell the |
1074 | * kernel, so that it can pass CPU time/scheduling to the | |
1075 | * destination for the time, if it wants to. If we | |
1076 | * synchronously wait for the result anyway, we won't need CPU | |
1077 | * anyway. */ | |
94e15fdc DH |
1078 | if (hint_sync_call) { |
1079 | m->kdbus->flags |= KDBUS_MSG_EXPECT_REPLY; | |
1080 | cmd.flags |= KDBUS_SEND_SYNC_REPLY; | |
1081 | } | |
069f5e61 | 1082 | |
94e15fdc | 1083 | r = ioctl(bus->output_fd, KDBUS_CMD_SEND, &cmd); |
cb67f718 DM |
1084 | if (r < 0) { |
1085 | _cleanup_bus_error_free_ sd_bus_error error = SD_BUS_ERROR_NULL; | |
1086 | sd_bus_message *reply; | |
253ce82b | 1087 | |
cb67f718 DM |
1088 | if (errno == EAGAIN || errno == EINTR) |
1089 | return 0; | |
1090 | else if (errno == ENXIO || errno == ESRCH) { | |
6629161f | 1091 | |
cb67f718 DM |
1092 | /* ENXIO: unique name not known |
1093 | * ESRCH: well-known name not known */ | |
6629161f | 1094 | |
cb67f718 DM |
1095 | if (m->header->type == SD_BUS_MESSAGE_METHOD_CALL) |
1096 | sd_bus_error_setf(&error, SD_BUS_ERROR_SERVICE_UNKNOWN, "Destination %s not known", m->destination); | |
1097 | else { | |
1098 | log_debug("Could not deliver message to %s as destination is not known. Ignoring.", m->destination); | |
1099 | return 0; | |
1100 | } | |
777d7a61 | 1101 | |
cb67f718 | 1102 | } else if (errno == EADDRNOTAVAIL) { |
fd8d62d9 | 1103 | |
cb67f718 | 1104 | /* EADDRNOTAVAIL: activation is possible, but turned off in request flags */ |
bc7fd8cd | 1105 | |
cb67f718 DM |
1106 | if (m->header->type == SD_BUS_MESSAGE_METHOD_CALL) |
1107 | sd_bus_error_setf(&error, SD_BUS_ERROR_SERVICE_UNKNOWN, "Activation of %s not requested", m->destination); | |
1108 | else { | |
1109 | log_debug("Could not deliver message to %s as destination is not activated. Ignoring.", m->destination); | |
1110 | return 0; | |
1111 | } | |
1112 | } else | |
1113 | return -errno; | |
bc7fd8cd | 1114 | |
cb67f718 DM |
1115 | r = bus_message_new_synthetic_error( |
1116 | bus, | |
1117 | BUS_MESSAGE_COOKIE(m), | |
1118 | &error, | |
1119 | &reply); | |
bc7fd8cd | 1120 | |
cb67f718 DM |
1121 | if (r < 0) |
1122 | return r; | |
bc7fd8cd | 1123 | |
cb67f718 DM |
1124 | r = bus_seal_synthetic_message(bus, reply); |
1125 | if (r < 0) | |
1126 | return r; | |
62b3e928 | 1127 | |
cb67f718 | 1128 | bus->rqueue[bus->rqueue_size++] = reply; |
bc7fd8cd | 1129 | |
069f5e61 LP |
1130 | } else if (hint_sync_call) { |
1131 | struct kdbus_msg *k; | |
fd8d62d9 | 1132 | |
94e15fdc | 1133 | k = (struct kdbus_msg *)((uint8_t *)bus->kdbus_buffer + cmd.reply.offset); |
069f5e61 | 1134 | assert(k); |
777d7a61 | 1135 | |
069f5e61 | 1136 | if (k->payload_type == KDBUS_PAYLOAD_DBUS) { |
1307c3ff | 1137 | |
069f5e61 LP |
1138 | r = bus_kernel_make_message(bus, k); |
1139 | if (r < 0) { | |
1140 | close_kdbus_msg(bus, k); | |
1307c3ff | 1141 | |
069f5e61 LP |
1142 | /* Anybody can send us invalid messages, let's just drop them. */ |
1143 | if (r == -EBADMSG || r == -EPROTOTYPE) | |
da927ba9 | 1144 | log_debug_errno(r, "Ignoring invalid message: %m"); |
069f5e61 LP |
1145 | else |
1146 | return r; | |
1147 | } | |
1148 | } else { | |
1149 | log_debug("Ignoring message with unknown payload type %llu.", (unsigned long long) k->payload_type); | |
1150 | close_kdbus_msg(bus, k); | |
1151 | } | |
cb67f718 | 1152 | } |
069f5e61 LP |
1153 | |
1154 | return 1; | |
cb67f718 | 1155 | } |
69aec65c | 1156 | |
76877fb9 LP |
1157 | static int push_name_owner_changed( |
1158 | sd_bus *bus, | |
1159 | const char *name, | |
1160 | const char *old_owner, | |
1161 | const char *new_owner, | |
1162 | const struct kdbus_timestamp *ts) { | |
1163 | ||
cb67f718 DM |
1164 | _cleanup_bus_message_unref_ sd_bus_message *m = NULL; |
1165 | int r; | |
2dc9970b | 1166 | |
cb67f718 | 1167 | assert(bus); |
2dc9970b | 1168 | |
cb67f718 DM |
1169 | r = sd_bus_message_new_signal( |
1170 | bus, | |
151b9b96 | 1171 | &m, |
cb67f718 DM |
1172 | "/org/freedesktop/DBus", |
1173 | "org.freedesktop.DBus", | |
151b9b96 | 1174 | "NameOwnerChanged"); |
cb67f718 DM |
1175 | if (r < 0) |
1176 | return r; | |
2dc9970b | 1177 | |
cb67f718 DM |
1178 | r = sd_bus_message_append(m, "sss", name, old_owner, new_owner); |
1179 | if (r < 0) | |
1180 | return r; | |
5b12334d | 1181 | |
7d31d924 | 1182 | bus_message_set_sender_driver(bus, m); |
76877fb9 | 1183 | message_set_timestamp(bus, m, ts); |
5b12334d | 1184 | |
cb67f718 DM |
1185 | r = bus_seal_synthetic_message(bus, m); |
1186 | if (r < 0) | |
1187 | return r; | |
5b12334d | 1188 | |
cb67f718 DM |
1189 | bus->rqueue[bus->rqueue_size++] = m; |
1190 | m = NULL; | |
5b12334d | 1191 | |
cb67f718 DM |
1192 | return 1; |
1193 | } | |
5b12334d | 1194 | |
76877fb9 LP |
1195 | static int translate_name_change( |
1196 | sd_bus *bus, | |
1197 | const struct kdbus_msg *k, | |
1198 | const struct kdbus_item *d, | |
1199 | const struct kdbus_timestamp *ts) { | |
1200 | ||
cb67f718 | 1201 | char new_owner[UNIQUE_NAME_MAX], old_owner[UNIQUE_NAME_MAX]; |
5b12334d | 1202 | |
cb67f718 DM |
1203 | assert(bus); |
1204 | assert(k); | |
1205 | assert(d); | |
751bc6ac | 1206 | |
619d7a03 | 1207 | if (d->type == KDBUS_ITEM_NAME_ADD || (d->name_change.old_id.flags & (KDBUS_NAME_IN_QUEUE|KDBUS_NAME_ACTIVATOR))) |
cb67f718 DM |
1208 | old_owner[0] = 0; |
1209 | else | |
619d7a03 | 1210 | sprintf(old_owner, ":1.%llu", (unsigned long long) d->name_change.old_id.id); |
751bc6ac | 1211 | |
619d7a03 | 1212 | if (d->type == KDBUS_ITEM_NAME_REMOVE || (d->name_change.new_id.flags & (KDBUS_NAME_IN_QUEUE|KDBUS_NAME_ACTIVATOR))) { |
751bc6ac | 1213 | |
cb67f718 DM |
1214 | if (isempty(old_owner)) |
1215 | return 0; | |
5b12334d | 1216 | |
cb67f718 DM |
1217 | new_owner[0] = 0; |
1218 | } else | |
619d7a03 | 1219 | sprintf(new_owner, ":1.%llu", (unsigned long long) d->name_change.new_id.id); |
5b12334d | 1220 | |
76877fb9 | 1221 | return push_name_owner_changed(bus, d->name_change.name, old_owner, new_owner, ts); |
cb67f718 | 1222 | } |
5b12334d | 1223 | |
76877fb9 LP |
1224 | static int translate_id_change( |
1225 | sd_bus *bus, | |
1226 | const struct kdbus_msg *k, | |
1227 | const struct kdbus_item *d, | |
1228 | const struct kdbus_timestamp *ts) { | |
1229 | ||
cb67f718 | 1230 | char owner[UNIQUE_NAME_MAX]; |
2e2ec0ea | 1231 | |
cb67f718 DM |
1232 | assert(bus); |
1233 | assert(k); | |
1234 | assert(d); | |
777d7a61 | 1235 | |
cb67f718 | 1236 | sprintf(owner, ":1.%llu", d->id_change.id); |
2e2ec0ea | 1237 | |
cb67f718 DM |
1238 | return push_name_owner_changed( |
1239 | bus, owner, | |
1240 | d->type == KDBUS_ITEM_ID_ADD ? NULL : owner, | |
76877fb9 LP |
1241 | d->type == KDBUS_ITEM_ID_ADD ? owner : NULL, |
1242 | ts); | |
cb67f718 | 1243 | } |
49b832c5 | 1244 | |
76877fb9 LP |
1245 | static int translate_reply( |
1246 | sd_bus *bus, | |
1247 | const struct kdbus_msg *k, | |
1248 | const struct kdbus_item *d, | |
1249 | const struct kdbus_timestamp *ts) { | |
1250 | ||
cb67f718 DM |
1251 | _cleanup_bus_message_unref_ sd_bus_message *m = NULL; |
1252 | int r; | |
777d7a61 | 1253 | |
cb67f718 DM |
1254 | assert(bus); |
1255 | assert(k); | |
1256 | assert(d); | |
acb5a3cb | 1257 | |
cb67f718 DM |
1258 | r = bus_message_new_synthetic_error( |
1259 | bus, | |
1260 | k->cookie_reply, | |
1261 | d->type == KDBUS_ITEM_REPLY_TIMEOUT ? | |
1262 | &SD_BUS_ERROR_MAKE_CONST(SD_BUS_ERROR_NO_REPLY, "Method call timed out") : | |
1263 | &SD_BUS_ERROR_MAKE_CONST(SD_BUS_ERROR_NO_REPLY, "Method call peer died"), | |
1264 | &m); | |
1307c3ff | 1265 | if (r < 0) |
cb67f718 | 1266 | return r; |
51038c03 | 1267 | |
76877fb9 | 1268 | message_set_timestamp(bus, m, ts); |
51038c03 | 1269 | |
cb67f718 DM |
1270 | r = bus_seal_synthetic_message(bus, m); |
1271 | if (r < 0) | |
1272 | return r; | |
6629161f | 1273 | |
7adc46fc | 1274 | bus->rqueue[bus->rqueue_size++] = m; |
cb67f718 | 1275 | m = NULL; |
7d22c717 | 1276 | |
6629161f | 1277 | return 1; |
cb67f718 | 1278 | } |
1307c3ff | 1279 | |
cb67f718 | 1280 | static int bus_kernel_translate_message(sd_bus *bus, struct kdbus_msg *k) { |
76877fb9 | 1281 | static int (* const translate[])(sd_bus *bus, const struct kdbus_msg *k, const struct kdbus_item *d, const struct kdbus_timestamp *ts) = { |
cb67f718 DM |
1282 | [KDBUS_ITEM_NAME_ADD - _KDBUS_ITEM_KERNEL_BASE] = translate_name_change, |
1283 | [KDBUS_ITEM_NAME_REMOVE - _KDBUS_ITEM_KERNEL_BASE] = translate_name_change, | |
1284 | [KDBUS_ITEM_NAME_CHANGE - _KDBUS_ITEM_KERNEL_BASE] = translate_name_change, | |
1307c3ff | 1285 | |
cb67f718 DM |
1286 | [KDBUS_ITEM_ID_ADD - _KDBUS_ITEM_KERNEL_BASE] = translate_id_change, |
1287 | [KDBUS_ITEM_ID_REMOVE - _KDBUS_ITEM_KERNEL_BASE] = translate_id_change, | |
1288 | ||
1289 | [KDBUS_ITEM_REPLY_TIMEOUT - _KDBUS_ITEM_KERNEL_BASE] = translate_reply, | |
1290 | [KDBUS_ITEM_REPLY_DEAD - _KDBUS_ITEM_KERNEL_BASE] = translate_reply, | |
1291 | }; | |
1292 | ||
76877fb9 LP |
1293 | struct kdbus_item *d, *found = NULL; |
1294 | struct kdbus_timestamp *ts = NULL; | |
1295 | ||
cb67f718 DM |
1296 | assert(bus); |
1297 | assert(k); | |
1298 | assert(k->payload_type == KDBUS_PAYLOAD_KERNEL); | |
1299 | ||
1300 | KDBUS_ITEM_FOREACH(d, k, items) { | |
856d6e09 | 1301 | if (d->type == KDBUS_ITEM_TIMESTAMP) |
76877fb9 | 1302 | ts = &d->timestamp; |
856d6e09 | 1303 | |
cb67f718 DM |
1304 | if (d->type >= _KDBUS_ITEM_KERNEL_BASE && d->type < _KDBUS_ITEM_KERNEL_BASE + ELEMENTSOF(translate)) { |
1305 | if (found) | |
1306 | return -EBADMSG; | |
1307 | found = d; | |
1308 | } else | |
1309 | log_debug("Got unknown field from kernel %llu", d->type); | |
1307c3ff LP |
1310 | } |
1311 | ||
cb67f718 DM |
1312 | if (!found) { |
1313 | log_debug("Didn't find a kernel message to translate."); | |
1314 | return 0; | |
1315 | } | |
1316 | ||
76877fb9 | 1317 | return translate[found->type - _KDBUS_ITEM_KERNEL_BASE](bus, k, found, ts); |
6629161f LP |
1318 | } |
1319 | ||
766c5809 | 1320 | int bus_kernel_read_message(sd_bus *bus, bool hint_priority, int64_t priority) { |
94e15fdc | 1321 | struct kdbus_cmd_recv recv = { .size = sizeof(recv) }; |
6629161f | 1322 | struct kdbus_msg *k; |
6629161f LP |
1323 | int r; |
1324 | ||
1325 | assert(bus); | |
7d22c717 | 1326 | |
7adc46fc | 1327 | r = bus_rqueue_make_room(bus); |
7d22c717 LP |
1328 | if (r < 0) |
1329 | return r; | |
6629161f | 1330 | |
766c5809 LP |
1331 | if (hint_priority) { |
1332 | recv.flags |= KDBUS_RECV_USE_PRIORITY; | |
1333 | recv.priority = priority; | |
1334 | } | |
1335 | ||
94e15fdc | 1336 | r = ioctl(bus->input_fd, KDBUS_CMD_RECV, &recv); |
fd8d62d9 | 1337 | if (r < 0) { |
6629161f LP |
1338 | if (errno == EAGAIN) |
1339 | return 0; | |
1340 | ||
f9a458c6 LP |
1341 | if (errno == EOVERFLOW) { |
1342 | log_debug("%s: kdbus reports %" PRIu64 " dropped broadcast messages, ignoring.", strna(bus->description), (uint64_t) recv.dropped_msgs); | |
1343 | return 0; | |
1344 | } | |
1345 | ||
fd8d62d9 | 1346 | return -errno; |
6629161f LP |
1347 | } |
1348 | ||
94e15fdc | 1349 | k = (struct kdbus_msg *)((uint8_t *)bus->kdbus_buffer + recv.reply.offset); |
e1d337d4 | 1350 | if (k->payload_type == KDBUS_PAYLOAD_DBUS) { |
7d22c717 | 1351 | r = bus_kernel_make_message(bus, k); |
e1d337d4 LP |
1352 | |
1353 | /* Anybody can send us invalid messages, let's just drop them. */ | |
1354 | if (r == -EBADMSG || r == -EPROTOTYPE) { | |
da927ba9 | 1355 | log_debug_errno(r, "Ignoring invalid message: %m"); |
e1d337d4 LP |
1356 | r = 0; |
1357 | } | |
1358 | ||
1359 | } else if (k->payload_type == KDBUS_PAYLOAD_KERNEL) | |
7d22c717 | 1360 | r = bus_kernel_translate_message(bus, k); |
069f5e61 LP |
1361 | else { |
1362 | log_debug("Ignoring message with unknown payload type %llu.", (unsigned long long) k->payload_type); | |
777d7a61 | 1363 | r = 0; |
069f5e61 | 1364 | } |
777d7a61 | 1365 | |
fd8d62d9 LP |
1366 | if (r <= 0) |
1367 | close_kdbus_msg(bus, k); | |
6629161f | 1368 | |
51038c03 | 1369 | return r < 0 ? r : 1; |
6629161f LP |
1370 | } |
1371 | ||
8e959fbf | 1372 | int bus_kernel_pop_memfd(sd_bus *bus, void **address, size_t *mapped, size_t *allocated) { |
bc7fd8cd | 1373 | struct memfd_cache *c; |
45fbe937 | 1374 | int fd; |
bc7fd8cd LP |
1375 | |
1376 | assert(address); | |
8e959fbf LP |
1377 | assert(mapped); |
1378 | assert(allocated); | |
35460afc LP |
1379 | |
1380 | if (!bus || !bus->is_kernel) | |
1381 | return -ENOTSUP; | |
bc7fd8cd | 1382 | |
76b7742c | 1383 | assert_se(pthread_mutex_lock(&bus->memfd_cache_mutex) >= 0); |
45fbe937 | 1384 | |
bc7fd8cd | 1385 | if (bus->n_memfd_cache <= 0) { |
45fbe937 LP |
1386 | int r; |
1387 | ||
76b7742c | 1388 | assert_se(pthread_mutex_unlock(&bus->memfd_cache_mutex) >= 0); |
bc7fd8cd | 1389 | |
455971c1 | 1390 | r = memfd_new(bus->description); |
9b05bc48 | 1391 | if (r < 0) |
73843b52 | 1392 | return r; |
bc7fd8cd LP |
1393 | |
1394 | *address = NULL; | |
8e959fbf LP |
1395 | *mapped = 0; |
1396 | *allocated = 0; | |
a6082d77 | 1397 | return r; |
bc7fd8cd LP |
1398 | } |
1399 | ||
bf30e48f | 1400 | c = &bus->memfd_cache[--bus->n_memfd_cache]; |
bc7fd8cd LP |
1401 | |
1402 | assert(c->fd >= 0); | |
8e959fbf | 1403 | assert(c->mapped == 0 || c->address); |
bc7fd8cd LP |
1404 | |
1405 | *address = c->address; | |
8e959fbf LP |
1406 | *mapped = c->mapped; |
1407 | *allocated = c->allocated; | |
45fbe937 LP |
1408 | fd = c->fd; |
1409 | ||
76b7742c | 1410 | assert_se(pthread_mutex_unlock(&bus->memfd_cache_mutex) >= 0); |
bc7fd8cd | 1411 | |
45fbe937 LP |
1412 | return fd; |
1413 | } | |
1414 | ||
1415 | static void close_and_munmap(int fd, void *address, size_t size) { | |
1416 | if (size > 0) | |
76b7742c | 1417 | assert_se(munmap(address, PAGE_ALIGN(size)) >= 0); |
45fbe937 | 1418 | |
03e334a1 | 1419 | safe_close(fd); |
bc7fd8cd LP |
1420 | } |
1421 | ||
8e959fbf | 1422 | void bus_kernel_push_memfd(sd_bus *bus, int fd, void *address, size_t mapped, size_t allocated) { |
bc7fd8cd | 1423 | struct memfd_cache *c; |
8e959fbf | 1424 | uint64_t max_mapped = PAGE_ALIGN(MEMFD_CACHE_ITEM_SIZE_MAX); |
bc7fd8cd LP |
1425 | |
1426 | assert(fd >= 0); | |
8e959fbf | 1427 | assert(mapped == 0 || address); |
bc7fd8cd | 1428 | |
45fbe937 | 1429 | if (!bus || !bus->is_kernel) { |
8e959fbf | 1430 | close_and_munmap(fd, address, mapped); |
45fbe937 LP |
1431 | return; |
1432 | } | |
1433 | ||
76b7742c | 1434 | assert_se(pthread_mutex_lock(&bus->memfd_cache_mutex) >= 0); |
bc7fd8cd | 1435 | |
45fbe937 | 1436 | if (bus->n_memfd_cache >= ELEMENTSOF(bus->memfd_cache)) { |
76b7742c | 1437 | assert_se(pthread_mutex_unlock(&bus->memfd_cache_mutex) >= 0); |
bc7fd8cd | 1438 | |
8e959fbf | 1439 | close_and_munmap(fd, address, mapped); |
bc7fd8cd LP |
1440 | return; |
1441 | } | |
1442 | ||
1443 | c = &bus->memfd_cache[bus->n_memfd_cache++]; | |
1444 | c->fd = fd; | |
1445 | c->address = address; | |
1446 | ||
1447 | /* If overly long, let's return a bit to the OS */ | |
8e959fbf | 1448 | if (mapped > max_mapped) { |
73843b52 | 1449 | assert_se(memfd_set_size(fd, max_mapped) >= 0); |
8e959fbf LP |
1450 | assert_se(munmap((uint8_t*) address + max_mapped, PAGE_ALIGN(mapped - max_mapped)) >= 0); |
1451 | c->mapped = c->allocated = max_mapped; | |
1452 | } else { | |
1453 | c->mapped = mapped; | |
1454 | c->allocated = allocated; | |
1455 | } | |
45fbe937 | 1456 | |
76b7742c | 1457 | assert_se(pthread_mutex_unlock(&bus->memfd_cache_mutex) >= 0); |
bc7fd8cd LP |
1458 | } |
1459 | ||
1460 | void bus_kernel_flush_memfd(sd_bus *b) { | |
1461 | unsigned i; | |
1462 | ||
1463 | assert(b); | |
1464 | ||
76b7742c | 1465 | for (i = 0; i < b->n_memfd_cache; i++) |
8e959fbf | 1466 | close_and_munmap(b->memfd_cache[i].fd, b->memfd_cache[i].address, b->memfd_cache[i].mapped); |
bc7fd8cd | 1467 | } |
0253ddcc | 1468 | |
b5dae4c7 | 1469 | uint64_t request_name_flags_to_kdbus(uint64_t flags) { |
e3dd987c | 1470 | uint64_t f = 0; |
0253ddcc | 1471 | |
e3dd987c LP |
1472 | if (flags & SD_BUS_NAME_ALLOW_REPLACEMENT) |
1473 | f |= KDBUS_NAME_ALLOW_REPLACEMENT; | |
0253ddcc | 1474 | |
e3dd987c LP |
1475 | if (flags & SD_BUS_NAME_REPLACE_EXISTING) |
1476 | f |= KDBUS_NAME_REPLACE_EXISTING; | |
0253ddcc | 1477 | |
d90bb669 | 1478 | if (flags & SD_BUS_NAME_QUEUE) |
e3dd987c | 1479 | f |= KDBUS_NAME_QUEUE; |
0253ddcc | 1480 | |
b5dae4c7 | 1481 | return f; |
e3dd987c LP |
1482 | } |
1483 | ||
b5dae4c7 | 1484 | uint64_t attach_flags_to_kdbus(uint64_t mask) { |
e3dd987c LP |
1485 | uint64_t m = 0; |
1486 | ||
705a415f LP |
1487 | if (mask & (SD_BUS_CREDS_UID|SD_BUS_CREDS_EUID|SD_BUS_CREDS_SUID|SD_BUS_CREDS_FSUID| |
1488 | SD_BUS_CREDS_GID|SD_BUS_CREDS_EGID|SD_BUS_CREDS_SGID|SD_BUS_CREDS_FSGID)) | |
e3dd987c LP |
1489 | m |= KDBUS_ATTACH_CREDS; |
1490 | ||
32802361 | 1491 | if (mask & (SD_BUS_CREDS_PID|SD_BUS_CREDS_TID)) |
705a415f LP |
1492 | m |= KDBUS_ATTACH_PIDS; |
1493 | ||
a2243d54 DM |
1494 | if (mask & SD_BUS_CREDS_COMM) |
1495 | m |= KDBUS_ATTACH_PID_COMM; | |
1496 | ||
1497 | if (mask & SD_BUS_CREDS_TID_COMM) | |
1498 | m |= KDBUS_ATTACH_TID_COMM; | |
e3dd987c LP |
1499 | |
1500 | if (mask & SD_BUS_CREDS_EXE) | |
1501 | m |= KDBUS_ATTACH_EXE; | |
1502 | ||
1503 | if (mask & SD_BUS_CREDS_CMDLINE) | |
1504 | m |= KDBUS_ATTACH_CMDLINE; | |
1505 | ||
1506 | 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)) | |
1507 | m |= KDBUS_ATTACH_CGROUP; | |
1508 | ||
1509 | if (mask & (SD_BUS_CREDS_EFFECTIVE_CAPS|SD_BUS_CREDS_PERMITTED_CAPS|SD_BUS_CREDS_INHERITABLE_CAPS|SD_BUS_CREDS_BOUNDING_CAPS)) | |
1510 | m |= KDBUS_ATTACH_CAPS; | |
1511 | ||
1512 | if (mask & SD_BUS_CREDS_SELINUX_CONTEXT) | |
1513 | m |= KDBUS_ATTACH_SECLABEL; | |
0253ddcc | 1514 | |
e3dd987c LP |
1515 | if (mask & (SD_BUS_CREDS_AUDIT_SESSION_ID|SD_BUS_CREDS_AUDIT_LOGIN_UID)) |
1516 | m |= KDBUS_ATTACH_AUDIT; | |
1517 | ||
49b832c5 LP |
1518 | if (mask & SD_BUS_CREDS_WELL_KNOWN_NAMES) |
1519 | m |= KDBUS_ATTACH_NAMES; | |
1520 | ||
455971c1 | 1521 | if (mask & SD_BUS_CREDS_DESCRIPTION) |
635f9f0d | 1522 | m |= KDBUS_ATTACH_CONN_DESCRIPTION; |
cccb0b2c | 1523 | |
02581590 LP |
1524 | if (mask & SD_BUS_CREDS_SUPPLEMENTARY_GIDS) |
1525 | m |= KDBUS_ATTACH_AUXGROUPS; | |
1526 | ||
b5dae4c7 | 1527 | return m; |
0253ddcc | 1528 | } |
e3dd987c | 1529 | |
f2769777 | 1530 | int bus_kernel_create_bus(const char *name, bool world, char **s) { |
816a3f9e | 1531 | struct kdbus_cmd_make *make; |
e3dd987c | 1532 | struct kdbus_item *n; |
fa7796e9 | 1533 | size_t l; |
e3dd987c LP |
1534 | int fd; |
1535 | ||
1536 | assert(name); | |
1537 | assert(s); | |
1538 | ||
63cc4c31 | 1539 | fd = open("/sys/fs/kdbus/control", O_RDWR|O_NOCTTY|O_CLOEXEC); |
e3dd987c LP |
1540 | if (fd < 0) |
1541 | return -errno; | |
1542 | ||
fa7796e9 LP |
1543 | l = strlen(name); |
1544 | make = alloca0_align(offsetof(struct kdbus_cmd_make, items) + | |
1545 | ALIGN8(offsetof(struct kdbus_item, bloom_parameter) + sizeof(struct kdbus_bloom_parameter)) + | |
1546 | ALIGN8(offsetof(struct kdbus_item, data64) + sizeof(uint64_t)) + | |
19ee32dc | 1547 | ALIGN8(offsetof(struct kdbus_item, data64) + sizeof(uint64_t)) + |
fa7796e9 | 1548 | ALIGN8(offsetof(struct kdbus_item, str) + DECIMAL_STR_MAX(uid_t) + 1 + l + 1), |
7f3d3ba1 | 1549 | 8); |
e3dd987c | 1550 | |
816a3f9e DM |
1551 | make->size = offsetof(struct kdbus_cmd_make, items); |
1552 | ||
fa7796e9 | 1553 | /* Set the bloom parameters */ |
e3dd987c | 1554 | n = make->items; |
18a28147 KS |
1555 | n->size = offsetof(struct kdbus_item, bloom_parameter) + |
1556 | sizeof(struct kdbus_bloom_parameter); | |
1557 | n->type = KDBUS_ITEM_BLOOM_PARAMETER; | |
b28ff39f LP |
1558 | n->bloom_parameter.size = DEFAULT_BLOOM_SIZE; |
1559 | n->bloom_parameter.n_hash = DEFAULT_BLOOM_N_HASH; | |
1560 | ||
1561 | assert_cc(DEFAULT_BLOOM_SIZE > 0); | |
1562 | assert_cc(DEFAULT_BLOOM_N_HASH > 0); | |
1563 | ||
816a3f9e DM |
1564 | make->size += ALIGN8(n->size); |
1565 | ||
fa7796e9 LP |
1566 | /* The busses we create make no restrictions on what metadata |
1567 | * peers can read from incoming messages. */ | |
1568 | n = KDBUS_ITEM_NEXT(n); | |
1569 | n->type = KDBUS_ITEM_ATTACH_FLAGS_RECV; | |
1570 | n->size = offsetof(struct kdbus_item, data64) + sizeof(uint64_t); | |
19ee32dc DH |
1571 | n->data64[0] = _KDBUS_ATTACH_ANY; |
1572 | make->size += ALIGN8(n->size); | |
1573 | ||
1574 | /* Provide all metadata via bus-owner queries */ | |
1575 | n = KDBUS_ITEM_NEXT(n); | |
1576 | n->type = KDBUS_ITEM_ATTACH_FLAGS_SEND; | |
1577 | n->size = offsetof(struct kdbus_item, data64) + sizeof(uint64_t); | |
fa7796e9 LP |
1578 | n->data64[0] = _KDBUS_ATTACH_ANY; |
1579 | make->size += ALIGN8(n->size); | |
1580 | ||
1581 | /* Set the a good name */ | |
816a3f9e | 1582 | n = KDBUS_ITEM_NEXT(n); |
a4152e3f | 1583 | sprintf(n->str, UID_FMT "-%s", getuid(), name); |
e3dd987c | 1584 | n->size = offsetof(struct kdbus_item, str) + strlen(n->str) + 1; |
5e16c257 | 1585 | n->type = KDBUS_ITEM_MAKE_NAME; |
816a3f9e | 1586 | make->size += ALIGN8(n->size); |
e3dd987c | 1587 | |
f7c7cd03 | 1588 | make->flags = world ? KDBUS_MAKE_ACCESS_WORLD : 0; |
e3dd987c LP |
1589 | |
1590 | if (ioctl(fd, KDBUS_CMD_BUS_MAKE, make) < 0) { | |
03e334a1 | 1591 | safe_close(fd); |
e3dd987c LP |
1592 | return -errno; |
1593 | } | |
1594 | ||
1595 | if (s) { | |
1596 | char *p; | |
1597 | ||
63cc4c31 | 1598 | p = strjoin("/sys/fs/kdbus/", n->str, "/bus", NULL); |
e3dd987c | 1599 | if (!p) { |
03e334a1 | 1600 | safe_close(fd); |
e3dd987c LP |
1601 | return -ENOMEM; |
1602 | } | |
1603 | ||
1604 | *s = p; | |
1605 | } | |
1606 | ||
1607 | return fd; | |
1608 | } | |
9bd37b40 | 1609 | |
8f077bf9 | 1610 | int bus_kernel_open_bus_fd(const char *bus, char **path) { |
a4152e3f LP |
1611 | char *p; |
1612 | int fd; | |
8f077bf9 | 1613 | size_t len; |
1683342a | 1614 | |
8aee3fc7 LP |
1615 | assert(bus); |
1616 | ||
63cc4c31 | 1617 | len = strlen("/sys/fs/kdbus/") + DECIMAL_STR_MAX(uid_t) + 1 + strlen(bus) + strlen("/bus") + 1; |
8f077bf9 ZJS |
1618 | |
1619 | if (path) { | |
8aee3fc7 | 1620 | p = new(char, len); |
8f077bf9 ZJS |
1621 | if (!p) |
1622 | return -ENOMEM; | |
8f077bf9 | 1623 | } else |
8aee3fc7 LP |
1624 | p = newa(char, len); |
1625 | ||
63cc4c31 | 1626 | sprintf(p, "/sys/fs/kdbus/" UID_FMT "-%s/bus", getuid(), bus); |
1683342a | 1627 | |
a4152e3f | 1628 | fd = open(p, O_RDWR|O_NOCTTY|O_CLOEXEC); |
8aee3fc7 LP |
1629 | if (fd < 0) { |
1630 | if (path) | |
1631 | free(p); | |
1632 | ||
a4152e3f | 1633 | return -errno; |
8aee3fc7 LP |
1634 | } |
1635 | ||
1636 | if (path) | |
1637 | *path = p; | |
a4152e3f LP |
1638 | |
1639 | return fd; | |
1683342a DM |
1640 | } |
1641 | ||
e7d718af | 1642 | int bus_kernel_create_endpoint(const char *bus_name, const char *ep_name, char **ep_path) { |
8e00bfc2 | 1643 | _cleanup_free_ char *path = NULL; |
e7d718af DM |
1644 | struct kdbus_cmd_make *make; |
1645 | struct kdbus_item *n; | |
342f3005 | 1646 | const char *name; |
e7d718af DM |
1647 | int fd; |
1648 | ||
1649 | fd = bus_kernel_open_bus_fd(bus_name, &path); | |
1650 | if (fd < 0) | |
1651 | return fd; | |
1652 | ||
342f3005 DH |
1653 | make = alloca0_align(ALIGN8(offsetof(struct kdbus_cmd_make, items)) + |
1654 | ALIGN8(offsetof(struct kdbus_item, str) + DECIMAL_STR_MAX(uid_t) + 1 + strlen(ep_name) + 1), | |
1655 | 8); | |
1656 | make->size = ALIGN8(offsetof(struct kdbus_cmd_make, items)); | |
e7d718af DM |
1657 | make->flags = KDBUS_MAKE_ACCESS_WORLD; |
1658 | ||
1659 | n = make->items; | |
342f3005 DH |
1660 | sprintf(n->str, UID_FMT "-%s", getuid(), ep_name); |
1661 | n->size = offsetof(struct kdbus_item, str) + strlen(n->str) + 1; | |
e7d718af | 1662 | n->type = KDBUS_ITEM_MAKE_NAME; |
342f3005 DH |
1663 | make->size += ALIGN8(n->size); |
1664 | name = n->str; | |
e7d718af | 1665 | |
40885bb2 | 1666 | if (ioctl(fd, KDBUS_CMD_ENDPOINT_MAKE, make) < 0) { |
e7d718af DM |
1667 | safe_close(fd); |
1668 | return -errno; | |
1669 | } | |
1670 | ||
e7d718af | 1671 | if (ep_path) { |
2c652b6b LP |
1672 | char *p; |
1673 | ||
342f3005 | 1674 | p = strjoin(dirname(path), "/", name, NULL); |
2c652b6b | 1675 | if (!p) { |
4edf33d1 | 1676 | safe_close(fd); |
e7d718af | 1677 | return -ENOMEM; |
4edf33d1 | 1678 | } |
2c652b6b LP |
1679 | |
1680 | *ep_path = p; | |
e7d718af DM |
1681 | } |
1682 | ||
1683 | return fd; | |
1684 | } | |
1685 | ||
ae095f86 LP |
1686 | int bus_kernel_try_close(sd_bus *bus) { |
1687 | assert(bus); | |
1688 | assert(bus->is_kernel); | |
1689 | ||
1690 | if (ioctl(bus->input_fd, KDBUS_CMD_BYEBYE) < 0) | |
1691 | return -errno; | |
1692 | ||
1693 | return 0; | |
1694 | } | |
ff975efb LP |
1695 | |
1696 | int bus_kernel_drop_one(int fd) { | |
1697 | struct kdbus_cmd_recv recv = { | |
94e15fdc DH |
1698 | .size = sizeof(recv), |
1699 | .flags = KDBUS_RECV_DROP, | |
ff975efb LP |
1700 | }; |
1701 | ||
1702 | assert(fd >= 0); | |
1703 | ||
94e15fdc | 1704 | if (ioctl(fd, KDBUS_CMD_RECV, &recv) < 0) |
ff975efb LP |
1705 | return -errno; |
1706 | ||
1707 | return 0; | |
1708 | } | |
b5dae4c7 LP |
1709 | |
1710 | int bus_kernel_realize_attach_flags(sd_bus *bus) { | |
1711 | struct kdbus_cmd_update *update; | |
1712 | struct kdbus_item *n; | |
1713 | ||
1714 | assert(bus); | |
1715 | assert(bus->is_kernel); | |
1716 | ||
fa7796e9 LP |
1717 | update = alloca0_align(offsetof(struct kdbus_cmd_update, items) + |
1718 | ALIGN8(offsetof(struct kdbus_item, data64) + sizeof(uint64_t)), | |
1719 | 8); | |
b5dae4c7 LP |
1720 | |
1721 | n = update->items; | |
1722 | n->type = KDBUS_ITEM_ATTACH_FLAGS_RECV; | |
1723 | n->size = offsetof(struct kdbus_item, data64) + sizeof(uint64_t); | |
1724 | n->data64[0] = bus->attach_flags; | |
1725 | ||
fa7796e9 LP |
1726 | update->size = |
1727 | offsetof(struct kdbus_cmd_update, items) + | |
1728 | ALIGN8(n->size); | |
b5dae4c7 LP |
1729 | |
1730 | if (ioctl(bus->input_fd, KDBUS_CMD_CONN_UPDATE, update) < 0) | |
1731 | return -errno; | |
1732 | ||
1733 | return 0; | |
1734 | } | |
1a299299 LP |
1735 | |
1736 | int bus_kernel_fix_attach_mask(void) { | |
1737 | _cleanup_free_ char *mask = NULL; | |
412c18f1 | 1738 | uint64_t m = (uint64_t) -1; |
1a299299 LP |
1739 | char buf[2+16+2]; |
1740 | int r; | |
1741 | ||
412c18f1 LP |
1742 | /* By default we don't want any kdbus metadata fields to be |
1743 | * suppressed, hence we reset the kernel mask for it to | |
1744 | * (uint64_t) -1. This is overridable via a kernel command | |
1745 | * line option, however. */ | |
1746 | ||
1a299299 | 1747 | r = get_proc_cmdline_key("systemd.kdbus_attach_flags_mask=", &mask); |
1214b53c LP |
1748 | if (r < 0) |
1749 | return log_warning_errno(r, "Failed to read kernel command line: %m"); | |
1a299299 LP |
1750 | |
1751 | if (mask) { | |
1752 | const char *p = mask; | |
1753 | ||
1754 | if (startswith(p, "0x")) | |
1755 | p += 2; | |
1756 | ||
1757 | if (sscanf(p, "%" PRIx64, &m) != 1) | |
1758 | log_warning("Couldn't parse systemd.kdbus_attach_flags_mask= kernel command line parameter."); | |
1759 | } | |
1760 | ||
1761 | sprintf(buf, "0x%" PRIx64 "\n", m); | |
1762 | r = write_string_file("/sys/module/kdbus/parameters/attach_flags_mask", buf); | |
1214b53c LP |
1763 | if (r < 0) |
1764 | return log_full_errno( | |
cb01aedc | 1765 | IN_SET(r, -ENOENT, -EROFS) ? LOG_DEBUG : LOG_WARNING, r, |
1214b53c | 1766 | "Failed to write kdbus attach mask: %m"); |
1a299299 LP |
1767 | |
1768 | return 0; | |
1769 | } | |
3acc1daf LP |
1770 | |
1771 | int bus_kernel_get_bus_name(sd_bus *bus, char **name) { | |
1772 | struct kdbus_cmd_info cmd = { | |
1773 | .size = sizeof(struct kdbus_cmd_info), | |
1774 | }; | |
1775 | struct kdbus_info *info; | |
1776 | struct kdbus_item *item; | |
1777 | char *n = NULL; | |
1778 | int r; | |
1779 | ||
1780 | assert(bus); | |
1781 | assert(name); | |
1782 | assert(bus->is_kernel); | |
1783 | ||
1784 | r = ioctl(bus->input_fd, KDBUS_CMD_BUS_CREATOR_INFO, &cmd); | |
1785 | if (r < 0) | |
1786 | return -errno; | |
1787 | ||
1788 | info = (struct kdbus_info*) ((uint8_t*) bus->kdbus_buffer + cmd.offset); | |
1789 | ||
1790 | KDBUS_ITEM_FOREACH(item, info, items) | |
1791 | if (item->type == KDBUS_ITEM_MAKE_NAME) { | |
1792 | r = free_and_strdup(&n, item->str); | |
1793 | break; | |
1794 | } | |
1795 | ||
1796 | bus_kernel_cmd_free(bus, cmd.offset); | |
1797 | ||
1798 | if (r < 0) | |
1799 | return r; | |
1800 | if (!n) | |
1801 | return -EIO; | |
1802 | ||
1803 | *name = n; | |
1804 | return 0; | |
1805 | } |