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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> |
fd8d62d9 | 28 | #include <sys/mman.h> |
5972fe95 | 29 | #include <sys/prctl.h> |
6629161f | 30 | |
eef46c37 LP |
31 | /* When we include libgen.h because we need dirname() we immediately |
32 | * undefine basename() since libgen.h defines it as a macro to the XDG | |
33 | * version which is really broken. */ | |
34 | #include <libgen.h> | |
35 | #undef basename | |
36 | ||
6629161f | 37 | #include "util.h" |
65dae17a | 38 | #include "strv.h" |
6bcf0cf6 | 39 | #include "memfd-util.h" |
34a5d5e5 | 40 | #include "capability.h" |
1a299299 LP |
41 | #include "cgroup-util.h" |
42 | #include "fileio.h" | |
6629161f LP |
43 | |
44 | #include "bus-internal.h" | |
45 | #include "bus-message.h" | |
46 | #include "bus-kernel.h" | |
a56f19c4 | 47 | #include "bus-bloom.h" |
777d7a61 | 48 | #include "bus-util.h" |
a6278b88 | 49 | #include "bus-label.h" |
777d7a61 LP |
50 | |
51 | #define UNIQUE_NAME_MAX (3+DECIMAL_STR_MAX(uint64_t)) | |
6629161f | 52 | |
c7819669 | 53 | int bus_kernel_parse_unique_name(const char *s, uint64_t *id) { |
6629161f LP |
54 | int r; |
55 | ||
56 | assert(s); | |
57 | assert(id); | |
58 | ||
59 | if (!startswith(s, ":1.")) | |
60 | return 0; | |
61 | ||
62 | r = safe_atou64(s + 3, id); | |
63 | if (r < 0) | |
64 | return r; | |
65 | ||
66 | return 1; | |
67 | } | |
68 | ||
febfd508 | 69 | static void append_payload_vec(struct kdbus_item **d, const void *p, size_t sz) { |
6629161f | 70 | assert(d); |
6629161f LP |
71 | assert(sz > 0); |
72 | ||
e86b80b8 LP |
73 | *d = ALIGN8_PTR(*d); |
74 | ||
66b26c5c LP |
75 | /* Note that p can be NULL, which encodes a region full of |
76 | * zeroes, which is useful to optimize certain padding | |
77 | * conditions */ | |
78 | ||
febfd508 | 79 | (*d)->size = offsetof(struct kdbus_item, vec) + sizeof(struct kdbus_vec); |
ea1edece | 80 | (*d)->type = KDBUS_ITEM_PAYLOAD_VEC; |
a392d361 | 81 | (*d)->vec.address = PTR_TO_UINT64(p); |
6629161f LP |
82 | (*d)->vec.size = sz; |
83 | ||
febfd508 | 84 | *d = (struct kdbus_item *) ((uint8_t*) *d + (*d)->size); |
6629161f LP |
85 | } |
86 | ||
77adde63 | 87 | static void append_payload_memfd(struct kdbus_item **d, int memfd, size_t start, size_t sz) { |
a392d361 LP |
88 | assert(d); |
89 | assert(memfd >= 0); | |
90 | assert(sz > 0); | |
91 | ||
92 | *d = ALIGN8_PTR(*d); | |
93 | (*d)->size = offsetof(struct kdbus_item, memfd) + sizeof(struct kdbus_memfd); | |
ea1edece | 94 | (*d)->type = KDBUS_ITEM_PAYLOAD_MEMFD; |
a392d361 | 95 | (*d)->memfd.fd = memfd; |
77adde63 | 96 | (*d)->memfd.start = start; |
a392d361 LP |
97 | (*d)->memfd.size = sz; |
98 | ||
99 | *d = (struct kdbus_item *) ((uint8_t*) *d + (*d)->size); | |
100 | } | |
101 | ||
febfd508 | 102 | static void append_destination(struct kdbus_item **d, const char *s, size_t length) { |
6629161f | 103 | assert(d); |
b5baa8fe | 104 | assert(s); |
6629161f | 105 | |
e86b80b8 LP |
106 | *d = ALIGN8_PTR(*d); |
107 | ||
febfd508 | 108 | (*d)->size = offsetof(struct kdbus_item, str) + length + 1; |
ea1edece | 109 | (*d)->type = KDBUS_ITEM_DST_NAME; |
51038c03 | 110 | memcpy((*d)->str, s, length + 1); |
6629161f | 111 | |
febfd508 | 112 | *d = (struct kdbus_item *) ((uint8_t*) *d + (*d)->size); |
6629161f LP |
113 | } |
114 | ||
18a28147 KS |
115 | static struct kdbus_bloom_filter *append_bloom(struct kdbus_item **d, size_t length) { |
116 | struct kdbus_item *i; | |
a56f19c4 | 117 | |
b5baa8fe | 118 | assert(d); |
b5baa8fe | 119 | |
18a28147 | 120 | i = ALIGN8_PTR(*d); |
b5baa8fe | 121 | |
18a28147 KS |
122 | i->size = offsetof(struct kdbus_item, bloom_filter) + |
123 | offsetof(struct kdbus_bloom_filter, data) + | |
124 | length; | |
125 | i->type = KDBUS_ITEM_BLOOM_FILTER; | |
b5baa8fe | 126 | |
18a28147 | 127 | *d = (struct kdbus_item *) ((uint8_t*) i + i->size); |
a56f19c4 | 128 | |
18a28147 | 129 | return &i->bloom_filter; |
a56f19c4 LP |
130 | } |
131 | ||
febfd508 | 132 | static void append_fds(struct kdbus_item **d, const int fds[], unsigned n_fds) { |
9097fe29 LP |
133 | assert(d); |
134 | assert(fds); | |
135 | assert(n_fds > 0); | |
136 | ||
137 | *d = ALIGN8_PTR(*d); | |
febfd508 | 138 | (*d)->size = offsetof(struct kdbus_item, fds) + sizeof(int) * n_fds; |
ea1edece | 139 | (*d)->type = KDBUS_ITEM_FDS; |
9097fe29 LP |
140 | memcpy((*d)->fds, fds, sizeof(int) * n_fds); |
141 | ||
febfd508 | 142 | *d = (struct kdbus_item *) ((uint8_t*) *d + (*d)->size); |
9097fe29 LP |
143 | } |
144 | ||
1abe54d9 LP |
145 | static void add_bloom_arg(void *data, size_t size, unsigned n_hash, unsigned i, const char *t) { |
146 | char buf[sizeof("arg")-1 + 2 + sizeof("-slash-prefix")]; | |
147 | char *e; | |
148 | ||
149 | assert(data); | |
150 | assert(size > 0); | |
151 | assert(i < 64); | |
152 | assert(t); | |
153 | ||
154 | e = stpcpy(buf, "arg"); | |
155 | if (i < 10) | |
156 | *(e++) = '0' + (char) i; | |
157 | else { | |
158 | *(e++) = '0' + (char) (i / 10); | |
159 | *(e++) = '0' + (char) (i % 10); | |
160 | } | |
161 | ||
162 | *e = 0; | |
163 | bloom_add_pair(data, size, n_hash, buf, t); | |
164 | ||
165 | strcpy(e, "-dot-prefix"); | |
166 | bloom_add_prefixes(data, size, n_hash, buf, t, '.'); | |
167 | strcpy(e, "-slash-prefix"); | |
168 | bloom_add_prefixes(data, size, n_hash, buf, t, '/'); | |
169 | } | |
170 | ||
18a28147 KS |
171 | static int bus_message_setup_bloom(sd_bus_message *m, struct kdbus_bloom_filter *bloom) { |
172 | void *data; | |
a56f19c4 LP |
173 | unsigned i; |
174 | int r; | |
175 | ||
176 | assert(m); | |
177 | assert(bloom); | |
178 | ||
18a28147 | 179 | data = bloom->data; |
29804cc1 | 180 | memzero(data, m->bus->bloom_size); |
18a28147 | 181 | bloom->generation = 0; |
a56f19c4 | 182 | |
b28ff39f | 183 | 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 |
184 | |
185 | if (m->interface) | |
b28ff39f | 186 | bloom_add_pair(data, m->bus->bloom_size, m->bus->bloom_n_hash, "interface", m->interface); |
a56f19c4 | 187 | if (m->member) |
b28ff39f | 188 | bloom_add_pair(data, m->bus->bloom_size, m->bus->bloom_n_hash, "member", m->member); |
a56f19c4 | 189 | if (m->path) { |
b28ff39f LP |
190 | bloom_add_pair(data, m->bus->bloom_size, m->bus->bloom_n_hash, "path", m->path); |
191 | bloom_add_pair(data, m->bus->bloom_size, m->bus->bloom_n_hash, "path-slash-prefix", m->path); | |
192 | bloom_add_prefixes(data, m->bus->bloom_size, m->bus->bloom_n_hash, "path-slash-prefix", m->path, '/'); | |
a56f19c4 LP |
193 | } |
194 | ||
195 | r = sd_bus_message_rewind(m, true); | |
196 | if (r < 0) | |
197 | return r; | |
198 | ||
199 | for (i = 0; i < 64; i++) { | |
1abe54d9 | 200 | const char *t, *contents; |
a56f19c4 | 201 | char type; |
a56f19c4 | 202 | |
1abe54d9 | 203 | r = sd_bus_message_peek_type(m, &type, &contents); |
a56f19c4 LP |
204 | if (r < 0) |
205 | return r; | |
206 | ||
1abe54d9 | 207 | if (IN_SET(type, SD_BUS_TYPE_STRING, SD_BUS_TYPE_OBJECT_PATH, SD_BUS_TYPE_SIGNATURE)) { |
a56f19c4 | 208 | |
1abe54d9 LP |
209 | /* The bloom filter includes simple strings of any kind */ |
210 | r = sd_bus_message_read_basic(m, type, &t); | |
211 | if (r < 0) | |
212 | return r; | |
213 | ||
214 | add_bloom_arg(data, m->bus->bloom_size, m->bus->bloom_n_hash, i, t); | |
215 | } if (type == SD_BUS_TYPE_ARRAY && STR_IN_SET(contents, "s", "o", "g")) { | |
216 | ||
217 | /* As well as array of simple strings of any kinds */ | |
218 | r = sd_bus_message_enter_container(m, type, contents); | |
219 | if (r < 0) | |
220 | return r; | |
a56f19c4 | 221 | |
1abe54d9 LP |
222 | while ((r = sd_bus_message_read_basic(m, contents[0], &t)) > 0) |
223 | add_bloom_arg(data, m->bus->bloom_size, m->bus->bloom_n_hash, i, t); | |
224 | if (r < 0) | |
225 | return r; | |
226 | ||
227 | r = sd_bus_message_exit_container(m); | |
228 | if (r < 0) | |
229 | return r; | |
230 | ||
231 | } else | |
232 | /* Stop adding to bloom filter as soon as we | |
233 | * run into the first argument we cannot add | |
234 | * to it. */ | |
235 | break; | |
a56f19c4 LP |
236 | } |
237 | ||
238 | return 0; | |
b5baa8fe LP |
239 | } |
240 | ||
5b7d4c1c | 241 | static int bus_message_setup_kmsg(sd_bus *b, sd_bus_message *m) { |
9b29bb68 | 242 | struct bus_body_part *part; |
febfd508 | 243 | struct kdbus_item *d; |
022fb855 | 244 | const char *destination; |
6629161f LP |
245 | bool well_known; |
246 | uint64_t unique; | |
247 | size_t sz, dl; | |
9b29bb68 | 248 | unsigned i; |
6629161f LP |
249 | int r; |
250 | ||
5b7d4c1c | 251 | assert(b); |
6629161f LP |
252 | assert(m); |
253 | assert(m->sealed); | |
e9a967f9 | 254 | |
069f5e61 LP |
255 | /* We put this together only once, if this message is reused |
256 | * we reuse the earlier-built version */ | |
e9a967f9 LP |
257 | if (m->kdbus) |
258 | return 0; | |
6629161f | 259 | |
022fb855 DM |
260 | destination = m->destination ?: m->destination_ptr; |
261 | ||
262 | if (destination) { | |
263 | r = bus_kernel_parse_unique_name(destination, &unique); | |
6629161f LP |
264 | if (r < 0) |
265 | return r; | |
266 | ||
267 | well_known = r == 0; | |
268 | } else | |
269 | well_known = false; | |
270 | ||
b1454bf0 | 271 | sz = offsetof(struct kdbus_msg, items); |
6629161f | 272 | |
69aec65c | 273 | /* Add in fixed header, fields header and payload */ |
77adde63 DH |
274 | sz += (1 + m->n_body_parts) * ALIGN8(offsetof(struct kdbus_item, vec) + |
275 | MAX(sizeof(struct kdbus_vec), | |
276 | sizeof(struct kdbus_memfd))); | |
6629161f | 277 | |
69aec65c | 278 | /* Add space for bloom filter */ |
18a28147 KS |
279 | sz += ALIGN8(offsetof(struct kdbus_item, bloom_filter) + |
280 | offsetof(struct kdbus_bloom_filter, data) + | |
b28ff39f | 281 | m->bus->bloom_size); |
b5baa8fe | 282 | |
6629161f LP |
283 | /* Add in well-known destination header */ |
284 | if (well_known) { | |
022fb855 | 285 | dl = strlen(destination); |
febfd508 | 286 | sz += ALIGN8(offsetof(struct kdbus_item, str) + dl + 1); |
6629161f LP |
287 | } |
288 | ||
9097fe29 LP |
289 | /* Add space for unix fds */ |
290 | if (m->n_fds > 0) | |
febfd508 | 291 | sz += ALIGN8(offsetof(struct kdbus_item, fds) + sizeof(int)*m->n_fds); |
9097fe29 | 292 | |
c556fe79 | 293 | m->kdbus = memalign(8, sz); |
66b26c5c LP |
294 | if (!m->kdbus) { |
295 | r = -ENOMEM; | |
296 | goto fail; | |
297 | } | |
6629161f | 298 | |
66b26c5c | 299 | m->free_kdbus = true; |
29804cc1 | 300 | memzero(m->kdbus, sz); |
d9115e18 | 301 | |
6629161f | 302 | m->kdbus->flags = |
94e15fdc | 303 | ((m->header->flags & BUS_MESSAGE_NO_REPLY_EXPECTED) ? 0 : KDBUS_MSG_EXPECT_REPLY) | |
d7d052b2 DM |
304 | ((m->header->flags & BUS_MESSAGE_NO_AUTO_START) ? KDBUS_MSG_NO_AUTO_START : 0) | |
305 | ((m->header->type == SD_BUS_MESSAGE_SIGNAL) ? KDBUS_MSG_SIGNAL : 0); | |
022fb855 | 306 | |
7fa934b0 | 307 | if (well_known) |
022fb855 DM |
308 | /* verify_destination_id will usually be 0, which makes the kernel driver only look |
309 | * at the provided well-known name. Otherwise, the kernel will make sure the provided | |
310 | * destination id matches the owner of the provided weel-known-name, and fail if they | |
311 | * differ. Currently, this is only needed for bus-proxyd. */ | |
312 | m->kdbus->dst_id = m->verify_destination_id; | |
7fa934b0 | 313 | else |
022fb855 | 314 | m->kdbus->dst_id = destination ? unique : KDBUS_DST_ID_BROADCAST; |
022fb855 | 315 | |
6647dc66 | 316 | m->kdbus->payload_type = KDBUS_PAYLOAD_DBUS; |
2ac7c17f | 317 | m->kdbus->cookie = m->header->dbus2.cookie; |
ca7b42c8 | 318 | m->kdbus->priority = m->priority; |
80a33f11 | 319 | |
7fa934b0 | 320 | if (m->header->flags & BUS_MESSAGE_NO_REPLY_EXPECTED) |
693eb9a2 | 321 | m->kdbus->cookie_reply = m->reply_cookie; |
7fa934b0 | 322 | else { |
03785ad0 DM |
323 | struct timespec now; |
324 | ||
b680a194 | 325 | assert_se(clock_gettime(CLOCK_MONOTONIC_COARSE, &now) == 0); |
03785ad0 DM |
326 | m->kdbus->timeout_ns = now.tv_sec * NSEC_PER_SEC + now.tv_nsec + |
327 | m->timeout * NSEC_PER_USEC; | |
328 | } | |
6629161f | 329 | |
b1454bf0 | 330 | d = m->kdbus->items; |
6629161f LP |
331 | |
332 | if (well_known) | |
022fb855 | 333 | append_destination(&d, destination, dl); |
6629161f | 334 | |
c91cb83c | 335 | append_payload_vec(&d, m->header, BUS_MESSAGE_BODY_BEGIN(m)); |
a392d361 LP |
336 | |
337 | MESSAGE_FOREACH_PART(part, i, m) { | |
338 | if (part->is_zero) { | |
66b26c5c LP |
339 | /* If this is padding then simply send a |
340 | * vector with a NULL data pointer which the | |
341 | * kernel will just pass through. This is the | |
342 | * most efficient way to encode zeroes */ | |
343 | ||
a392d361 LP |
344 | append_payload_vec(&d, NULL, part->size); |
345 | continue; | |
346 | } | |
347 | ||
022fb855 | 348 | if (part->memfd >= 0 && part->sealed && destination) { |
66b26c5c LP |
349 | /* Try to send a memfd, if the part is |
350 | * sealed and this is not a broadcast. Since we can only */ | |
a392d361 | 351 | |
77adde63 | 352 | append_payload_memfd(&d, part->memfd, part->memfd_offset, part->size); |
66b26c5c | 353 | continue; |
a392d361 LP |
354 | } |
355 | ||
73e231ab JE |
356 | /* Otherwise, let's send a vector to the actual data. |
357 | * For that, we need to map it first. */ | |
66b26c5c LP |
358 | r = bus_body_part_map(part); |
359 | if (r < 0) | |
360 | goto fail; | |
a392d361 | 361 | |
bc7fd8cd | 362 | append_payload_vec(&d, part->data, part->size); |
a392d361 | 363 | } |
6629161f | 364 | |
7ce98121 | 365 | if (m->header->type == SD_BUS_MESSAGE_SIGNAL) { |
18a28147 | 366 | struct kdbus_bloom_filter *bloom; |
5b7d4c1c | 367 | |
b28ff39f | 368 | bloom = append_bloom(&d, m->bus->bloom_size); |
18a28147 | 369 | r = bus_message_setup_bloom(m, bloom); |
a392d361 LP |
370 | if (r < 0) |
371 | goto fail; | |
5b7d4c1c | 372 | } |
b5baa8fe | 373 | |
9097fe29 LP |
374 | if (m->n_fds > 0) |
375 | append_fds(&d, m->fds, m->n_fds); | |
376 | ||
e9a967f9 | 377 | m->kdbus->size = (uint8_t*) d - (uint8_t*) m->kdbus; |
6629161f LP |
378 | assert(m->kdbus->size <= sz); |
379 | ||
380 | return 0; | |
a392d361 LP |
381 | |
382 | fail: | |
66b26c5c | 383 | m->poisoned = true; |
a392d361 | 384 | return r; |
6629161f LP |
385 | } |
386 | ||
125dd074 ZJS |
387 | static void unset_memfds(struct sd_bus_message *m) { |
388 | struct bus_body_part *part; | |
389 | unsigned i; | |
390 | ||
391 | assert(m); | |
392 | ||
393 | /* Make sure the memfds are not freed twice */ | |
394 | MESSAGE_FOREACH_PART(part, i, m) | |
395 | if (part->memfd >= 0) | |
396 | part->memfd = -1; | |
397 | } | |
398 | ||
76877fb9 LP |
399 | static void message_set_timestamp(sd_bus *bus, sd_bus_message *m, const struct kdbus_timestamp *ts) { |
400 | assert(bus); | |
401 | assert(m); | |
402 | ||
403 | if (!ts) | |
404 | return; | |
405 | ||
406 | if (!(bus->attach_flags & KDBUS_ATTACH_TIMESTAMP)) | |
407 | return; | |
408 | ||
409 | m->realtime = ts->realtime_ns / NSEC_PER_USEC; | |
410 | m->monotonic = ts->monotonic_ns / NSEC_PER_USEC; | |
411 | m->seqnum = ts->seqnum; | |
412 | } | |
413 | ||
cb67f718 DM |
414 | static int bus_kernel_make_message(sd_bus *bus, struct kdbus_msg *k) { |
415 | sd_bus_message *m = NULL; | |
416 | struct kdbus_item *d; | |
417 | unsigned n_fds = 0; | |
418 | _cleanup_free_ int *fds = NULL; | |
2ac7c17f LP |
419 | struct bus_header *header = NULL; |
420 | void *footer = NULL; | |
421 | size_t header_size = 0, footer_size = 0; | |
422 | size_t n_bytes = 0, idx = 0; | |
cb67f718 | 423 | const char *destination = NULL, *seclabel = NULL; |
2ac7c17f | 424 | bool last_was_memfd = false; |
6629161f LP |
425 | int r; |
426 | ||
cb67f718 DM |
427 | assert(bus); |
428 | assert(k); | |
429 | assert(k->payload_type == KDBUS_PAYLOAD_DBUS); | |
35460afc | 430 | |
cb67f718 DM |
431 | KDBUS_ITEM_FOREACH(d, k, items) { |
432 | size_t l; | |
f08838da | 433 | |
cb67f718 | 434 | l = d->size - offsetof(struct kdbus_item, data); |
8f155917 | 435 | |
cb67f718 | 436 | switch (d->type) { |
62b3e928 | 437 | |
cb67f718 | 438 | case KDBUS_ITEM_PAYLOAD_OFF: |
2ac7c17f LP |
439 | if (!header) { |
440 | header = (struct bus_header*)((uint8_t*) k + d->vec.offset); | |
441 | header_size = d->vec.size; | |
954871d8 | 442 | } |
b381de41 | 443 | |
2ac7c17f LP |
444 | footer = (uint8_t*) k + d->vec.offset; |
445 | footer_size = d->vec.size; | |
446 | ||
cb67f718 | 447 | n_bytes += d->vec.size; |
2ac7c17f | 448 | last_was_memfd = false; |
cb67f718 | 449 | break; |
8a0e0ed9 | 450 | |
cb67f718 | 451 | case KDBUS_ITEM_PAYLOAD_MEMFD: |
2ac7c17f | 452 | if (!header) /* memfd cannot be first part */ |
cb67f718 | 453 | return -EBADMSG; |
8a0e0ed9 | 454 | |
cb67f718 | 455 | n_bytes += d->memfd.size; |
2ac7c17f | 456 | last_was_memfd = true; |
cb67f718 | 457 | break; |
8a0e0ed9 | 458 | |
cb67f718 DM |
459 | case KDBUS_ITEM_FDS: { |
460 | int *f; | |
461 | unsigned j; | |
8a0e0ed9 | 462 | |
cb67f718 DM |
463 | j = l / sizeof(int); |
464 | f = realloc(fds, sizeof(int) * (n_fds + j)); | |
465 | if (!f) | |
466 | return -ENOMEM; | |
8a0e0ed9 | 467 | |
cb67f718 DM |
468 | fds = f; |
469 | memcpy(fds + n_fds, d->fds, sizeof(int) * j); | |
470 | n_fds += j; | |
471 | break; | |
472 | } | |
62b3e928 | 473 | |
cb67f718 DM |
474 | case KDBUS_ITEM_SECLABEL: |
475 | seclabel = d->str; | |
476 | break; | |
fd8d62d9 LP |
477 | } |
478 | } | |
479 | ||
2ac7c17f | 480 | if (last_was_memfd) /* memfd cannot be last part */ |
cb67f718 | 481 | return -EBADMSG; |
de297575 | 482 | |
2ac7c17f LP |
483 | if (!header) |
484 | return -EBADMSG; | |
219728b3 | 485 | |
2ac7c17f | 486 | if (header_size < sizeof(struct bus_header)) |
cb67f718 | 487 | return -EBADMSG; |
6629161f | 488 | |
cb67f718 DM |
489 | /* on kdbus we only speak native endian gvariant, never dbus1 |
490 | * marshalling or reverse endian */ | |
2ac7c17f LP |
491 | if (header->version != 2 || |
492 | header->endian != BUS_NATIVE_ENDIAN) | |
cb67f718 | 493 | return -EPROTOTYPE; |
c58dea19 | 494 | |
2ac7c17f LP |
495 | r = bus_message_from_header( |
496 | bus, | |
497 | header, header_size, | |
498 | footer, footer_size, | |
499 | n_bytes, | |
500 | fds, n_fds, | |
501 | NULL, | |
502 | seclabel, 0, &m); | |
cb67f718 DM |
503 | if (r < 0) |
504 | return r; | |
6629161f | 505 | |
cb67f718 DM |
506 | /* The well-known names list is different from the other |
507 | credentials. If we asked for it, but nothing is there, this | |
508 | means that the list of well-known names is simply empty, not | |
509 | that we lack any data */ | |
35460afc | 510 | |
cb67f718 | 511 | m->creds.mask |= (SD_BUS_CREDS_UNIQUE_NAME|SD_BUS_CREDS_WELL_KNOWN_NAMES) & bus->creds_mask; |
f08838da | 512 | |
cb67f718 DM |
513 | KDBUS_ITEM_FOREACH(d, k, items) { |
514 | size_t l; | |
6629161f | 515 | |
cb67f718 | 516 | l = d->size - offsetof(struct kdbus_item, data); |
6629161f | 517 | |
cb67f718 | 518 | switch (d->type) { |
6629161f | 519 | |
cb67f718 DM |
520 | case KDBUS_ITEM_PAYLOAD_OFF: { |
521 | size_t begin_body; | |
6629161f | 522 | |
cb67f718 | 523 | begin_body = BUS_MESSAGE_BODY_BEGIN(m); |
6629161f | 524 | |
cb67f718 DM |
525 | if (idx + d->vec.size > begin_body) { |
526 | struct bus_body_part *part; | |
a43b9ca3 | 527 | |
cb67f718 | 528 | /* Contains body material */ |
6629161f | 529 | |
cb67f718 DM |
530 | part = message_append_part(m); |
531 | if (!part) { | |
532 | r = -ENOMEM; | |
533 | goto fail; | |
534 | } | |
a43b9ca3 | 535 | |
cb67f718 DM |
536 | /* A -1 offset is NUL padding. */ |
537 | part->is_zero = d->vec.offset == ~0ULL; | |
a43b9ca3 | 538 | |
cb67f718 DM |
539 | if (idx >= begin_body) { |
540 | if (!part->is_zero) | |
2ac7c17f | 541 | part->data = (uint8_t* )k + d->vec.offset; |
cb67f718 DM |
542 | part->size = d->vec.size; |
543 | } else { | |
544 | if (!part->is_zero) | |
2ac7c17f | 545 | part->data = (uint8_t*) k + d->vec.offset + (begin_body - idx); |
cb67f718 DM |
546 | part->size = d->vec.size - (begin_body - idx); |
547 | } | |
a43b9ca3 | 548 | |
cb67f718 | 549 | part->sealed = true; |
ff4994c5 | 550 | } |
a43b9ca3 | 551 | |
cb67f718 DM |
552 | idx += d->vec.size; |
553 | break; | |
554 | } | |
a43b9ca3 | 555 | |
cb67f718 DM |
556 | case KDBUS_ITEM_PAYLOAD_MEMFD: { |
557 | struct bus_body_part *part; | |
a43b9ca3 | 558 | |
cb67f718 DM |
559 | if (idx < BUS_MESSAGE_BODY_BEGIN(m)) { |
560 | r = -EBADMSG; | |
561 | goto fail; | |
ff4994c5 | 562 | } |
a43b9ca3 | 563 | |
cb67f718 DM |
564 | part = message_append_part(m); |
565 | if (!part) { | |
566 | r = -ENOMEM; | |
567 | goto fail; | |
568 | } | |
a43b9ca3 | 569 | |
cb67f718 | 570 | part->memfd = d->memfd.fd; |
77adde63 | 571 | part->memfd_offset = d->memfd.start; |
cb67f718 DM |
572 | part->size = d->memfd.size; |
573 | part->sealed = true; | |
a43b9ca3 | 574 | |
cb67f718 DM |
575 | idx += d->memfd.size; |
576 | break; | |
577 | } | |
a43b9ca3 | 578 | |
705a415f LP |
579 | case KDBUS_ITEM_PIDS: |
580 | ||
32802361 | 581 | /* The PID/TID might be missing, when the data |
2ac7c17f LP |
582 | * is faked by a bus proxy and it lacks that |
583 | * information about the real client (since | |
584 | * SO_PEERCRED is used for that). Also kernel | |
585 | * namespacing might make some of this data | |
586 | * unavailable when untranslatable. */ | |
705a415f LP |
587 | |
588 | if (d->pids.pid > 0) { | |
589 | m->creds.pid = (pid_t) d->pids.pid; | |
590 | m->creds.mask |= SD_BUS_CREDS_PID & bus->creds_mask; | |
591 | } | |
592 | ||
705a415f LP |
593 | if (d->pids.tid > 0) { |
594 | m->creds.tid = (pid_t) d->pids.tid; | |
cb67f718 DM |
595 | m->creds.mask |= SD_BUS_CREDS_TID & bus->creds_mask; |
596 | } | |
705a415f LP |
597 | |
598 | break; | |
599 | ||
600 | case KDBUS_ITEM_CREDS: | |
601 | ||
2ac7c17f LP |
602 | /* EUID/SUID/FSUID/EGID/SGID/FSGID might be |
603 | * missing too (see above). */ | |
705a415f | 604 | |
fed1e721 | 605 | if ((uid_t) d->creds.uid != UID_INVALID) { |
705a415f LP |
606 | m->creds.uid = (uid_t) d->creds.uid; |
607 | m->creds.mask |= SD_BUS_CREDS_UID & bus->creds_mask; | |
608 | } | |
609 | ||
fed1e721 | 610 | if ((uid_t) d->creds.euid != UID_INVALID) { |
705a415f LP |
611 | m->creds.euid = (uid_t) d->creds.euid; |
612 | m->creds.mask |= SD_BUS_CREDS_EUID & bus->creds_mask; | |
613 | } | |
614 | ||
fed1e721 | 615 | if ((uid_t) d->creds.suid != UID_INVALID) { |
705a415f LP |
616 | m->creds.suid = (uid_t) d->creds.suid; |
617 | m->creds.mask |= SD_BUS_CREDS_SUID & bus->creds_mask; | |
618 | } | |
619 | ||
fed1e721 | 620 | if ((uid_t) d->creds.fsuid != UID_INVALID) { |
705a415f LP |
621 | m->creds.fsuid = (uid_t) d->creds.fsuid; |
622 | m->creds.mask |= SD_BUS_CREDS_FSUID & bus->creds_mask; | |
623 | } | |
624 | ||
fed1e721 | 625 | if ((gid_t) d->creds.gid != GID_INVALID) { |
705a415f LP |
626 | m->creds.gid = (gid_t) d->creds.gid; |
627 | m->creds.mask |= SD_BUS_CREDS_GID & bus->creds_mask; | |
628 | } | |
629 | ||
fed1e721 | 630 | if ((gid_t) d->creds.egid != GID_INVALID) { |
705a415f LP |
631 | m->creds.egid = (gid_t) d->creds.egid; |
632 | m->creds.mask |= SD_BUS_CREDS_EGID & bus->creds_mask; | |
633 | } | |
634 | ||
fed1e721 | 635 | if ((gid_t) d->creds.sgid != GID_INVALID) { |
705a415f LP |
636 | m->creds.sgid = (gid_t) d->creds.sgid; |
637 | m->creds.mask |= SD_BUS_CREDS_SGID & bus->creds_mask; | |
638 | } | |
639 | ||
fed1e721 | 640 | if ((gid_t) d->creds.fsgid != GID_INVALID) { |
705a415f LP |
641 | m->creds.fsgid = (gid_t) d->creds.fsgid; |
642 | m->creds.mask |= SD_BUS_CREDS_FSGID & bus->creds_mask; | |
643 | } | |
644 | ||
cb67f718 | 645 | break; |
6629161f | 646 | |
cb67f718 | 647 | case KDBUS_ITEM_TIMESTAMP: |
76877fb9 | 648 | message_set_timestamp(bus, m, &d->timestamp); |
cb67f718 | 649 | break; |
fd8d62d9 | 650 | |
cb67f718 DM |
651 | case KDBUS_ITEM_PID_COMM: |
652 | m->creds.comm = d->str; | |
653 | m->creds.mask |= SD_BUS_CREDS_COMM & bus->creds_mask; | |
654 | break; | |
fd8d62d9 | 655 | |
cb67f718 DM |
656 | case KDBUS_ITEM_TID_COMM: |
657 | m->creds.tid_comm = d->str; | |
658 | m->creds.mask |= SD_BUS_CREDS_TID_COMM & bus->creds_mask; | |
659 | break; | |
6629161f | 660 | |
cb67f718 DM |
661 | case KDBUS_ITEM_EXE: |
662 | m->creds.exe = d->str; | |
663 | m->creds.mask |= SD_BUS_CREDS_EXE & bus->creds_mask; | |
664 | break; | |
6629161f | 665 | |
cb67f718 DM |
666 | case KDBUS_ITEM_CMDLINE: |
667 | m->creds.cmdline = d->str; | |
668 | m->creds.cmdline_size = l; | |
669 | m->creds.mask |= SD_BUS_CREDS_CMDLINE & bus->creds_mask; | |
670 | break; | |
777d7a61 | 671 | |
cb67f718 DM |
672 | case KDBUS_ITEM_CGROUP: |
673 | m->creds.cgroup = d->str; | |
674 | 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 | 675 | |
fe3f22d1 DK |
676 | r = bus_get_root_path(bus); |
677 | if (r < 0) | |
678 | goto fail; | |
777d7a61 | 679 | |
cb67f718 | 680 | m->creds.cgroup_root = bus->cgroup_root; |
cb67f718 | 681 | break; |
777d7a61 | 682 | |
cb67f718 | 683 | case KDBUS_ITEM_AUDIT: |
6dfcc64b LP |
684 | if ((uint32_t) d->audit.sessionid != (uint32_t) -1) { |
685 | m->creds.audit_session_id = (uint32_t) d->audit.sessionid; | |
686 | m->creds.mask |= SD_BUS_CREDS_AUDIT_SESSION_ID & bus->creds_mask; | |
687 | } | |
688 | ||
fed1e721 | 689 | if ((uid_t) d->audit.loginuid != UID_INVALID) { |
6dfcc64b LP |
690 | m->creds.audit_login_uid = (uid_t) d->audit.loginuid; |
691 | m->creds.mask |= SD_BUS_CREDS_AUDIT_LOGIN_UID & bus->creds_mask; | |
692 | } | |
cb67f718 | 693 | break; |
777d7a61 | 694 | |
cb67f718 | 695 | case KDBUS_ITEM_CAPS: |
34a5d5e5 DH |
696 | if (d->caps.last_cap != cap_last_cap() || |
697 | d->size - offsetof(struct kdbus_item, caps.caps) < DIV_ROUND_UP(d->caps.last_cap, 32U) * 4 * 4) { | |
698 | r = -EBADMSG; | |
699 | goto fail; | |
700 | } | |
701 | ||
7d9fcc2b | 702 | m->creds.capability = d->caps.caps; |
cb67f718 DM |
703 | 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; |
704 | break; | |
219728b3 | 705 | |
cb67f718 | 706 | case KDBUS_ITEM_DST_NAME: |
9f6dfd06 LP |
707 | if (!service_name_is_valid(d->str)) { |
708 | r = -EBADMSG; | |
709 | goto fail; | |
710 | } | |
219728b3 | 711 | |
cb67f718 DM |
712 | destination = d->str; |
713 | break; | |
777d7a61 | 714 | |
635f9f0d | 715 | case KDBUS_ITEM_OWNED_NAME: |
9f6dfd06 LP |
716 | if (!service_name_is_valid(d->name.name)) { |
717 | r = -EBADMSG; | |
cb67f718 | 718 | goto fail; |
9f6dfd06 LP |
719 | } |
720 | ||
721 | if (bus->creds_mask & SD_BUS_CREDS_WELL_KNOWN_NAMES) { | |
50c45216 LP |
722 | char **wkn; |
723 | size_t n; | |
724 | ||
725 | /* We just extend the array here, but | |
726 | * do not allocate the strings inside | |
727 | * of it, instead we just point to our | |
728 | * buffer directly. */ | |
729 | n = strv_length(m->creds.well_known_names); | |
730 | wkn = realloc(m->creds.well_known_names, (n + 2) * sizeof(char*)); | |
731 | if (!wkn) { | |
732 | r = -ENOMEM; | |
9f6dfd06 | 733 | goto fail; |
50c45216 LP |
734 | } |
735 | ||
736 | wkn[n] = d->name.name; | |
737 | wkn[n+1] = NULL; | |
738 | m->creds.well_known_names = wkn; | |
9f6dfd06 LP |
739 | |
740 | m->creds.mask |= SD_BUS_CREDS_WELL_KNOWN_NAMES; | |
741 | } | |
cb67f718 | 742 | break; |
777d7a61 | 743 | |
635f9f0d | 744 | case KDBUS_ITEM_CONN_DESCRIPTION: |
455971c1 LP |
745 | m->creds.description = d->str; |
746 | m->creds.mask |= SD_BUS_CREDS_DESCRIPTION & bus->creds_mask; | |
cccb0b2c LP |
747 | break; |
748 | ||
02581590 LP |
749 | case KDBUS_ITEM_AUXGROUPS: |
750 | ||
751 | if (bus->creds_mask & SD_BUS_CREDS_SUPPLEMENTARY_GIDS) { | |
e12d81ae | 752 | assert_cc(sizeof(gid_t) == sizeof(uint32_t)); |
02581590 | 753 | |
e12d81ae LP |
754 | m->creds.n_supplementary_gids = (d->size - offsetof(struct kdbus_item, data32)) / sizeof(uint32_t); |
755 | m->creds.supplementary_gids = (gid_t*) d->data32; | |
02581590 LP |
756 | m->creds.mask |= SD_BUS_CREDS_SUPPLEMENTARY_GIDS; |
757 | } | |
758 | ||
759 | break; | |
760 | ||
cb67f718 DM |
761 | case KDBUS_ITEM_FDS: |
762 | case KDBUS_ITEM_SECLABEL: | |
763 | break; | |
d78bf250 | 764 | |
cb67f718 DM |
765 | default: |
766 | log_debug("Got unknown field from kernel %llu", d->type); | |
767 | } | |
768 | } | |
d78bf250 | 769 | |
38ce47e2 LP |
770 | /* If we requested the list of well-known names to be appended |
771 | * and the sender had none no item for it will be | |
315a73d9 | 772 | * attached. However, this does *not* mean that the kernel |
38ce47e2 LP |
773 | * didn't want to provide this information to us. Hence, let's |
774 | * explicitly mark this information as available if it was | |
775 | * requested. */ | |
776 | m->creds.mask |= bus->creds_mask & SD_BUS_CREDS_WELL_KNOWN_NAMES; | |
777 | ||
cb67f718 DM |
778 | r = bus_message_parse_fields(m); |
779 | if (r < 0) | |
780 | goto fail; | |
777d7a61 | 781 | |
7fa934b0 | 782 | /* Refuse messages if kdbus and dbus1 cookie doesn't match up */ |
2ac7c17f | 783 | if ((uint64_t) m->header->dbus2.cookie != k->cookie) { |
7fa934b0 LP |
784 | r = -EBADMSG; |
785 | goto fail; | |
786 | } | |
787 | ||
788 | /* Refuse messages where the reply flag doesn't match up */ | |
94e15fdc | 789 | if (!(m->header->flags & BUS_MESSAGE_NO_REPLY_EXPECTED) != !!(k->flags & KDBUS_MSG_EXPECT_REPLY)) { |
7fa934b0 LP |
790 | r = -EBADMSG; |
791 | goto fail; | |
792 | } | |
793 | ||
794 | /* Refuse reply messages where the reply cookie doesn't match up */ | |
795 | if ((m->header->flags & BUS_MESSAGE_NO_REPLY_EXPECTED) && m->reply_cookie != k->cookie_reply) { | |
796 | r = -EBADMSG; | |
797 | goto fail; | |
798 | } | |
799 | ||
800 | /* Refuse messages where the autostart flag doesn't match up */ | |
94e15fdc | 801 | if (!(m->header->flags & BUS_MESSAGE_NO_AUTO_START) != !(k->flags & KDBUS_MSG_NO_AUTO_START)) { |
7fa934b0 LP |
802 | r = -EBADMSG; |
803 | goto fail; | |
804 | } | |
805 | ||
cb67f718 | 806 | /* Override information from the user header with data from the kernel */ |
7d31d924 LP |
807 | if (k->src_id == KDBUS_SRC_ID_KERNEL) |
808 | bus_message_set_sender_driver(bus, m); | |
809 | else { | |
cb67f718 DM |
810 | snprintf(m->sender_buffer, sizeof(m->sender_buffer), ":1.%llu", (unsigned long long) k->src_id); |
811 | m->sender = m->creds.unique_name = m->sender_buffer; | |
812 | } | |
777d7a61 | 813 | |
cb67f718 DM |
814 | if (destination) |
815 | m->destination = destination; | |
816 | else if (k->dst_id == KDBUS_DST_ID_BROADCAST) | |
817 | m->destination = NULL; | |
818 | else if (k->dst_id == KDBUS_DST_ID_NAME) | |
819 | m->destination = bus->unique_name; /* fill in unique name if the well-known name is missing */ | |
820 | else { | |
821 | snprintf(m->destination_buffer, sizeof(m->destination_buffer), ":1.%llu", (unsigned long long) k->dst_id); | |
822 | m->destination = m->destination_buffer; | |
823 | } | |
777d7a61 | 824 | |
cb67f718 DM |
825 | /* We take possession of the kmsg struct now */ |
826 | m->kdbus = k; | |
827 | m->release_kdbus = true; | |
828 | m->free_fds = true; | |
829 | fds = NULL; | |
777d7a61 | 830 | |
cb67f718 | 831 | bus->rqueue[bus->rqueue_size++] = m; |
777d7a61 | 832 | |
cb67f718 | 833 | return 1; |
777d7a61 | 834 | |
cb67f718 | 835 | fail: |
125dd074 ZJS |
836 | unset_memfds(m); |
837 | sd_bus_message_unref(m); | |
777d7a61 | 838 | |
cb67f718 DM |
839 | return r; |
840 | } | |
777d7a61 | 841 | |
cb67f718 | 842 | int bus_kernel_take_fd(sd_bus *b) { |
d31f486b | 843 | struct kdbus_bloom_parameter *bloom = NULL; |
cb67f718 | 844 | struct kdbus_cmd_hello *hello; |
d31f486b | 845 | struct kdbus_item_list *items; |
cb67f718 | 846 | struct kdbus_item *item; |
5972fe95 LP |
847 | _cleanup_free_ char *g = NULL; |
848 | const char *name; | |
849 | size_t l = 0, m = 0, sz; | |
cb67f718 | 850 | int r; |
777d7a61 | 851 | |
cb67f718 | 852 | assert(b); |
7adc46fc | 853 | |
cb67f718 DM |
854 | if (b->is_server) |
855 | return -EINVAL; | |
777d7a61 | 856 | |
cb67f718 | 857 | b->use_memfd = 1; |
777d7a61 | 858 | |
455971c1 LP |
859 | if (b->description) { |
860 | g = bus_label_escape(b->description); | |
5972fe95 LP |
861 | if (!g) |
862 | return -ENOMEM; | |
863 | ||
864 | name = g; | |
865 | } else { | |
866 | char pr[17] = {}; | |
867 | ||
868 | /* If no name is explicitly set, we'll include a hint | |
869 | * indicating the library implementation, a hint which | |
870 | * kind of bus this is and the thread name */ | |
871 | ||
872 | assert_se(prctl(PR_GET_NAME, (unsigned long) pr) >= 0); | |
873 | ||
874 | if (isempty(pr)) { | |
875 | name = b->is_system ? "sd-system" : | |
876 | b->is_user ? "sd-user" : "sd"; | |
877 | } else { | |
878 | _cleanup_free_ char *e = NULL; | |
879 | ||
a6278b88 | 880 | e = bus_label_escape(pr); |
5972fe95 LP |
881 | if (!e) |
882 | return -ENOMEM; | |
883 | ||
884 | g = strappend(b->is_system ? "sd-system-" : | |
885 | b->is_user ? "sd-user-" : "sd-", | |
886 | e); | |
887 | if (!g) | |
888 | return -ENOMEM; | |
889 | ||
890 | name = g; | |
891 | } | |
892 | ||
455971c1 LP |
893 | b->description = bus_label_unescape(name); |
894 | if (!b->description) | |
5972fe95 LP |
895 | return -ENOMEM; |
896 | } | |
897 | ||
898 | m = strlen(name); | |
899 | ||
900 | sz = ALIGN8(offsetof(struct kdbus_cmd_hello, items)) + | |
901 | ALIGN8(offsetof(struct kdbus_item, str) + m + 1); | |
777d7a61 | 902 | |
cb67f718 | 903 | if (b->fake_creds_valid) |
5972fe95 | 904 | sz += ALIGN8(offsetof(struct kdbus_item, creds) + sizeof(struct kdbus_creds)); |
777d7a61 | 905 | |
705a415f LP |
906 | if (b->fake_pids_valid) |
907 | sz += ALIGN8(offsetof(struct kdbus_item, pids) + sizeof(struct kdbus_pids)); | |
908 | ||
cb67f718 DM |
909 | if (b->fake_label) { |
910 | l = strlen(b->fake_label); | |
911 | sz += ALIGN8(offsetof(struct kdbus_item, str) + l + 1); | |
912 | } | |
777d7a61 | 913 | |
7f3d3ba1 | 914 | hello = alloca0_align(sz, 8); |
cb67f718 | 915 | hello->size = sz; |
bc75205c | 916 | hello->flags = b->hello_flags; |
6f5c810a | 917 | hello->attach_flags_send = _KDBUS_ATTACH_ANY; |
d704fda9 | 918 | hello->attach_flags_recv = b->attach_flags; |
cb67f718 | 919 | hello->pool_size = KDBUS_POOL_SIZE; |
777d7a61 | 920 | |
cb67f718 DM |
921 | item = hello->items; |
922 | ||
5972fe95 | 923 | item->size = offsetof(struct kdbus_item, str) + m + 1; |
635f9f0d | 924 | item->type = KDBUS_ITEM_CONN_DESCRIPTION; |
5972fe95 LP |
925 | memcpy(item->str, name, m + 1); |
926 | item = KDBUS_ITEM_NEXT(item); | |
927 | ||
cb67f718 DM |
928 | if (b->fake_creds_valid) { |
929 | item->size = offsetof(struct kdbus_item, creds) + sizeof(struct kdbus_creds); | |
930 | item->type = KDBUS_ITEM_CREDS; | |
931 | item->creds = b->fake_creds; | |
932 | ||
933 | item = KDBUS_ITEM_NEXT(item); | |
777d7a61 LP |
934 | } |
935 | ||
705a415f LP |
936 | if (b->fake_pids_valid) { |
937 | item->size = offsetof(struct kdbus_item, pids) + sizeof(struct kdbus_pids); | |
938 | item->type = KDBUS_ITEM_PIDS; | |
939 | item->pids = b->fake_pids; | |
940 | ||
941 | item = KDBUS_ITEM_NEXT(item); | |
942 | } | |
943 | ||
cb67f718 DM |
944 | if (b->fake_label) { |
945 | item->size = offsetof(struct kdbus_item, str) + l + 1; | |
5972fe95 | 946 | item->type = KDBUS_ITEM_SECLABEL; |
cb67f718 | 947 | memcpy(item->str, b->fake_label, l+1); |
777d7a61 LP |
948 | } |
949 | ||
cb67f718 DM |
950 | r = ioctl(b->input_fd, KDBUS_CMD_HELLO, hello); |
951 | if (r < 0) | |
952 | return -errno; | |
777d7a61 | 953 | |
cb67f718 DM |
954 | if (!b->kdbus_buffer) { |
955 | b->kdbus_buffer = mmap(NULL, KDBUS_POOL_SIZE, PROT_READ, MAP_SHARED, b->input_fd, 0); | |
956 | if (b->kdbus_buffer == MAP_FAILED) { | |
957 | b->kdbus_buffer = NULL; | |
d31f486b DH |
958 | r = -errno; |
959 | goto fail; | |
cb67f718 DM |
960 | } |
961 | } | |
6629161f | 962 | |
4a3e79e1 | 963 | /* The higher 32bit of the bus_flags fields are considered |
cb67f718 | 964 | * 'incompatible flags'. Refuse them all for now. */ |
d31f486b DH |
965 | if (hello->bus_flags > 0xFFFFFFFFULL) { |
966 | r = -ENOTSUP; | |
967 | goto fail; | |
968 | } | |
6629161f | 969 | |
d31f486b DH |
970 | /* extract bloom parameters from items */ |
971 | items = (void*)((uint8_t*)b->kdbus_buffer + hello->offset); | |
972 | KDBUS_ITEM_FOREACH(item, items, items) { | |
973 | switch (item->type) { | |
974 | case KDBUS_ITEM_BLOOM_PARAMETER: | |
975 | bloom = &item->bloom_parameter; | |
976 | break; | |
977 | } | |
978 | } | |
6629161f | 979 | |
d31f486b DH |
980 | if (!bloom || !bloom_validate_parameters((size_t) bloom->size, (unsigned) bloom->n_hash)) { |
981 | r = -ENOTSUP; | |
982 | goto fail; | |
983 | } | |
b28ff39f | 984 | |
d31f486b DH |
985 | b->bloom_size = (size_t) bloom->size; |
986 | b->bloom_n_hash = (unsigned) bloom->n_hash; | |
987 | ||
988 | if (asprintf(&b->unique_name, ":1.%llu", (unsigned long long) hello->id) < 0) { | |
989 | r = -ENOMEM; | |
990 | goto fail; | |
991 | } | |
6629161f | 992 | |
cb67f718 | 993 | b->unique_id = hello->id; |
6629161f | 994 | |
cb67f718 DM |
995 | b->is_kernel = true; |
996 | b->bus_client = true; | |
bc75205c | 997 | b->can_fds = !!(hello->flags & KDBUS_HELLO_ACCEPT_FD); |
cb67f718 DM |
998 | b->message_version = 2; |
999 | b->message_endian = BUS_NATIVE_ENDIAN; | |
c91cb83c | 1000 | |
cb67f718 DM |
1001 | /* the kernel told us the UUID of the underlying bus */ |
1002 | memcpy(b->server_id.bytes, hello->id128, sizeof(b->server_id.bytes)); | |
6629161f | 1003 | |
d31f486b DH |
1004 | /* free returned items */ |
1005 | (void) bus_kernel_cmd_free(b, hello->offset); | |
cb67f718 | 1006 | return bus_start_running(b); |
d31f486b DH |
1007 | |
1008 | fail: | |
72e61104 | 1009 | (void) bus_kernel_cmd_free(b, hello->offset); |
d31f486b | 1010 | return r; |
cb67f718 | 1011 | } |
6629161f | 1012 | |
cb67f718 DM |
1013 | int bus_kernel_connect(sd_bus *b) { |
1014 | assert(b); | |
1015 | assert(b->input_fd < 0); | |
1016 | assert(b->output_fd < 0); | |
1017 | assert(b->kernel); | |
1307c3ff | 1018 | |
cb67f718 DM |
1019 | if (b->is_server) |
1020 | return -EINVAL; | |
1307c3ff | 1021 | |
cb67f718 DM |
1022 | b->input_fd = open(b->kernel, O_RDWR|O_NOCTTY|O_CLOEXEC); |
1023 | if (b->input_fd < 0) | |
1024 | return -errno; | |
6629161f | 1025 | |
cb67f718 | 1026 | b->output_fd = b->input_fd; |
6629161f | 1027 | |
cb67f718 DM |
1028 | return bus_kernel_take_fd(b); |
1029 | } | |
f9be01f3 | 1030 | |
52cfc037 LP |
1031 | int bus_kernel_cmd_free(sd_bus *bus, uint64_t offset) { |
1032 | struct kdbus_cmd_free cmd = { | |
d31f486b | 1033 | .size = sizeof(cmd), |
52cfc037 LP |
1034 | .offset = offset, |
1035 | }; | |
1036 | int r; | |
1037 | ||
1038 | assert(bus); | |
1039 | assert(bus->is_kernel); | |
1040 | ||
1041 | r = ioctl(bus->input_fd, KDBUS_CMD_FREE, &cmd); | |
1042 | if (r < 0) | |
1043 | return -errno; | |
1044 | ||
1045 | return 0; | |
1046 | } | |
1047 | ||
069f5e61 | 1048 | static void close_kdbus_msg(sd_bus *bus, struct kdbus_msg *k) { |
069f5e61 LP |
1049 | struct kdbus_item *d; |
1050 | ||
1051 | assert(bus); | |
1052 | assert(k); | |
1053 | ||
069f5e61 | 1054 | KDBUS_ITEM_FOREACH(d, k, items) { |
069f5e61 LP |
1055 | if (d->type == KDBUS_ITEM_FDS) |
1056 | close_many(d->fds, (d->size - offsetof(struct kdbus_item, fds)) / sizeof(int)); | |
1057 | else if (d->type == KDBUS_ITEM_PAYLOAD_MEMFD) | |
03e334a1 | 1058 | safe_close(d->memfd.fd); |
069f5e61 | 1059 | } |
ca794c8e | 1060 | |
52cfc037 | 1061 | bus_kernel_cmd_free(bus, (uint8_t*) k - (uint8_t*) bus->kdbus_buffer); |
069f5e61 LP |
1062 | } |
1063 | ||
1064 | int bus_kernel_write_message(sd_bus *bus, sd_bus_message *m, bool hint_sync_call) { | |
94e15fdc | 1065 | struct kdbus_cmd_send cmd = { }; |
cb67f718 | 1066 | int r; |
6629161f | 1067 | |
cb67f718 DM |
1068 | assert(bus); |
1069 | assert(m); | |
1070 | assert(bus->state == BUS_RUNNING); | |
6629161f | 1071 | |
cb67f718 DM |
1072 | /* If we can't deliver, we want room for the error message */ |
1073 | r = bus_rqueue_make_room(bus); | |
6629161f LP |
1074 | if (r < 0) |
1075 | return r; | |
1076 | ||
cb67f718 | 1077 | r = bus_message_setup_kmsg(bus, m); |
6629161f LP |
1078 | if (r < 0) |
1079 | return r; | |
1080 | ||
94e15fdc DH |
1081 | cmd.size = sizeof(cmd); |
1082 | cmd.msg_address = (uintptr_t)m->kdbus; | |
1083 | ||
069f5e61 LP |
1084 | /* If this is a synchronous method call, then let's tell the |
1085 | * kernel, so that it can pass CPU time/scheduling to the | |
1086 | * destination for the time, if it wants to. If we | |
1087 | * synchronously wait for the result anyway, we won't need CPU | |
1088 | * anyway. */ | |
94e15fdc DH |
1089 | if (hint_sync_call) { |
1090 | m->kdbus->flags |= KDBUS_MSG_EXPECT_REPLY; | |
1091 | cmd.flags |= KDBUS_SEND_SYNC_REPLY; | |
1092 | } | |
069f5e61 | 1093 | |
94e15fdc | 1094 | r = ioctl(bus->output_fd, KDBUS_CMD_SEND, &cmd); |
cb67f718 DM |
1095 | if (r < 0) { |
1096 | _cleanup_bus_error_free_ sd_bus_error error = SD_BUS_ERROR_NULL; | |
1097 | sd_bus_message *reply; | |
253ce82b | 1098 | |
cb67f718 DM |
1099 | if (errno == EAGAIN || errno == EINTR) |
1100 | return 0; | |
1101 | else if (errno == ENXIO || errno == ESRCH) { | |
6629161f | 1102 | |
cb67f718 DM |
1103 | /* ENXIO: unique name not known |
1104 | * ESRCH: well-known name not known */ | |
6629161f | 1105 | |
cb67f718 DM |
1106 | if (m->header->type == SD_BUS_MESSAGE_METHOD_CALL) |
1107 | sd_bus_error_setf(&error, SD_BUS_ERROR_SERVICE_UNKNOWN, "Destination %s not known", m->destination); | |
1108 | else { | |
1109 | log_debug("Could not deliver message to %s as destination is not known. Ignoring.", m->destination); | |
1110 | return 0; | |
1111 | } | |
777d7a61 | 1112 | |
cb67f718 | 1113 | } else if (errno == EADDRNOTAVAIL) { |
fd8d62d9 | 1114 | |
cb67f718 | 1115 | /* EADDRNOTAVAIL: activation is possible, but turned off in request flags */ |
bc7fd8cd | 1116 | |
cb67f718 DM |
1117 | if (m->header->type == SD_BUS_MESSAGE_METHOD_CALL) |
1118 | sd_bus_error_setf(&error, SD_BUS_ERROR_SERVICE_UNKNOWN, "Activation of %s not requested", m->destination); | |
1119 | else { | |
1120 | log_debug("Could not deliver message to %s as destination is not activated. Ignoring.", m->destination); | |
1121 | return 0; | |
1122 | } | |
1123 | } else | |
1124 | return -errno; | |
bc7fd8cd | 1125 | |
cb67f718 DM |
1126 | r = bus_message_new_synthetic_error( |
1127 | bus, | |
1128 | BUS_MESSAGE_COOKIE(m), | |
1129 | &error, | |
1130 | &reply); | |
bc7fd8cd | 1131 | |
cb67f718 DM |
1132 | if (r < 0) |
1133 | return r; | |
bc7fd8cd | 1134 | |
cb67f718 DM |
1135 | r = bus_seal_synthetic_message(bus, reply); |
1136 | if (r < 0) | |
1137 | return r; | |
62b3e928 | 1138 | |
cb67f718 | 1139 | bus->rqueue[bus->rqueue_size++] = reply; |
bc7fd8cd | 1140 | |
069f5e61 LP |
1141 | } else if (hint_sync_call) { |
1142 | struct kdbus_msg *k; | |
fd8d62d9 | 1143 | |
94e15fdc | 1144 | k = (struct kdbus_msg *)((uint8_t *)bus->kdbus_buffer + cmd.reply.offset); |
069f5e61 | 1145 | assert(k); |
777d7a61 | 1146 | |
069f5e61 | 1147 | if (k->payload_type == KDBUS_PAYLOAD_DBUS) { |
1307c3ff | 1148 | |
069f5e61 LP |
1149 | r = bus_kernel_make_message(bus, k); |
1150 | if (r < 0) { | |
1151 | close_kdbus_msg(bus, k); | |
1307c3ff | 1152 | |
069f5e61 LP |
1153 | /* Anybody can send us invalid messages, let's just drop them. */ |
1154 | if (r == -EBADMSG || r == -EPROTOTYPE) | |
da927ba9 | 1155 | log_debug_errno(r, "Ignoring invalid message: %m"); |
069f5e61 LP |
1156 | else |
1157 | return r; | |
1158 | } | |
1159 | } else { | |
1160 | log_debug("Ignoring message with unknown payload type %llu.", (unsigned long long) k->payload_type); | |
1161 | close_kdbus_msg(bus, k); | |
1162 | } | |
cb67f718 | 1163 | } |
069f5e61 LP |
1164 | |
1165 | return 1; | |
cb67f718 | 1166 | } |
69aec65c | 1167 | |
76877fb9 LP |
1168 | static int push_name_owner_changed( |
1169 | sd_bus *bus, | |
1170 | const char *name, | |
1171 | const char *old_owner, | |
1172 | const char *new_owner, | |
1173 | const struct kdbus_timestamp *ts) { | |
1174 | ||
cb67f718 DM |
1175 | _cleanup_bus_message_unref_ sd_bus_message *m = NULL; |
1176 | int r; | |
2dc9970b | 1177 | |
cb67f718 | 1178 | assert(bus); |
2dc9970b | 1179 | |
cb67f718 DM |
1180 | r = sd_bus_message_new_signal( |
1181 | bus, | |
151b9b96 | 1182 | &m, |
cb67f718 DM |
1183 | "/org/freedesktop/DBus", |
1184 | "org.freedesktop.DBus", | |
151b9b96 | 1185 | "NameOwnerChanged"); |
cb67f718 DM |
1186 | if (r < 0) |
1187 | return r; | |
2dc9970b | 1188 | |
cb67f718 DM |
1189 | r = sd_bus_message_append(m, "sss", name, old_owner, new_owner); |
1190 | if (r < 0) | |
1191 | return r; | |
5b12334d | 1192 | |
7d31d924 | 1193 | bus_message_set_sender_driver(bus, m); |
76877fb9 | 1194 | message_set_timestamp(bus, m, ts); |
5b12334d | 1195 | |
cb67f718 DM |
1196 | r = bus_seal_synthetic_message(bus, m); |
1197 | if (r < 0) | |
1198 | return r; | |
5b12334d | 1199 | |
cb67f718 DM |
1200 | bus->rqueue[bus->rqueue_size++] = m; |
1201 | m = NULL; | |
5b12334d | 1202 | |
cb67f718 DM |
1203 | return 1; |
1204 | } | |
5b12334d | 1205 | |
76877fb9 LP |
1206 | static int translate_name_change( |
1207 | sd_bus *bus, | |
1208 | const struct kdbus_msg *k, | |
1209 | const struct kdbus_item *d, | |
1210 | const struct kdbus_timestamp *ts) { | |
1211 | ||
cb67f718 | 1212 | char new_owner[UNIQUE_NAME_MAX], old_owner[UNIQUE_NAME_MAX]; |
5b12334d | 1213 | |
cb67f718 DM |
1214 | assert(bus); |
1215 | assert(k); | |
1216 | assert(d); | |
751bc6ac | 1217 | |
619d7a03 | 1218 | if (d->type == KDBUS_ITEM_NAME_ADD || (d->name_change.old_id.flags & (KDBUS_NAME_IN_QUEUE|KDBUS_NAME_ACTIVATOR))) |
cb67f718 DM |
1219 | old_owner[0] = 0; |
1220 | else | |
619d7a03 | 1221 | sprintf(old_owner, ":1.%llu", (unsigned long long) d->name_change.old_id.id); |
751bc6ac | 1222 | |
619d7a03 | 1223 | if (d->type == KDBUS_ITEM_NAME_REMOVE || (d->name_change.new_id.flags & (KDBUS_NAME_IN_QUEUE|KDBUS_NAME_ACTIVATOR))) { |
751bc6ac | 1224 | |
cb67f718 DM |
1225 | if (isempty(old_owner)) |
1226 | return 0; | |
5b12334d | 1227 | |
cb67f718 DM |
1228 | new_owner[0] = 0; |
1229 | } else | |
619d7a03 | 1230 | sprintf(new_owner, ":1.%llu", (unsigned long long) d->name_change.new_id.id); |
5b12334d | 1231 | |
76877fb9 | 1232 | return push_name_owner_changed(bus, d->name_change.name, old_owner, new_owner, ts); |
cb67f718 | 1233 | } |
5b12334d | 1234 | |
76877fb9 LP |
1235 | static int translate_id_change( |
1236 | sd_bus *bus, | |
1237 | const struct kdbus_msg *k, | |
1238 | const struct kdbus_item *d, | |
1239 | const struct kdbus_timestamp *ts) { | |
1240 | ||
cb67f718 | 1241 | char owner[UNIQUE_NAME_MAX]; |
2e2ec0ea | 1242 | |
cb67f718 DM |
1243 | assert(bus); |
1244 | assert(k); | |
1245 | assert(d); | |
777d7a61 | 1246 | |
cb67f718 | 1247 | sprintf(owner, ":1.%llu", d->id_change.id); |
2e2ec0ea | 1248 | |
cb67f718 DM |
1249 | return push_name_owner_changed( |
1250 | bus, owner, | |
1251 | d->type == KDBUS_ITEM_ID_ADD ? NULL : owner, | |
76877fb9 LP |
1252 | d->type == KDBUS_ITEM_ID_ADD ? owner : NULL, |
1253 | ts); | |
cb67f718 | 1254 | } |
49b832c5 | 1255 | |
76877fb9 LP |
1256 | static int translate_reply( |
1257 | sd_bus *bus, | |
1258 | const struct kdbus_msg *k, | |
1259 | const struct kdbus_item *d, | |
1260 | const struct kdbus_timestamp *ts) { | |
1261 | ||
cb67f718 DM |
1262 | _cleanup_bus_message_unref_ sd_bus_message *m = NULL; |
1263 | int r; | |
777d7a61 | 1264 | |
cb67f718 DM |
1265 | assert(bus); |
1266 | assert(k); | |
1267 | assert(d); | |
acb5a3cb | 1268 | |
cb67f718 DM |
1269 | r = bus_message_new_synthetic_error( |
1270 | bus, | |
1271 | k->cookie_reply, | |
1272 | d->type == KDBUS_ITEM_REPLY_TIMEOUT ? | |
1273 | &SD_BUS_ERROR_MAKE_CONST(SD_BUS_ERROR_NO_REPLY, "Method call timed out") : | |
1274 | &SD_BUS_ERROR_MAKE_CONST(SD_BUS_ERROR_NO_REPLY, "Method call peer died"), | |
1275 | &m); | |
1307c3ff | 1276 | if (r < 0) |
cb67f718 | 1277 | return r; |
51038c03 | 1278 | |
76877fb9 | 1279 | message_set_timestamp(bus, m, ts); |
51038c03 | 1280 | |
cb67f718 DM |
1281 | r = bus_seal_synthetic_message(bus, m); |
1282 | if (r < 0) | |
1283 | return r; | |
6629161f | 1284 | |
7adc46fc | 1285 | bus->rqueue[bus->rqueue_size++] = m; |
cb67f718 | 1286 | m = NULL; |
7d22c717 | 1287 | |
6629161f | 1288 | return 1; |
cb67f718 | 1289 | } |
1307c3ff | 1290 | |
cb67f718 | 1291 | static int bus_kernel_translate_message(sd_bus *bus, struct kdbus_msg *k) { |
76877fb9 | 1292 | static int (* const translate[])(sd_bus *bus, const struct kdbus_msg *k, const struct kdbus_item *d, const struct kdbus_timestamp *ts) = { |
cb67f718 DM |
1293 | [KDBUS_ITEM_NAME_ADD - _KDBUS_ITEM_KERNEL_BASE] = translate_name_change, |
1294 | [KDBUS_ITEM_NAME_REMOVE - _KDBUS_ITEM_KERNEL_BASE] = translate_name_change, | |
1295 | [KDBUS_ITEM_NAME_CHANGE - _KDBUS_ITEM_KERNEL_BASE] = translate_name_change, | |
1307c3ff | 1296 | |
cb67f718 DM |
1297 | [KDBUS_ITEM_ID_ADD - _KDBUS_ITEM_KERNEL_BASE] = translate_id_change, |
1298 | [KDBUS_ITEM_ID_REMOVE - _KDBUS_ITEM_KERNEL_BASE] = translate_id_change, | |
1299 | ||
1300 | [KDBUS_ITEM_REPLY_TIMEOUT - _KDBUS_ITEM_KERNEL_BASE] = translate_reply, | |
1301 | [KDBUS_ITEM_REPLY_DEAD - _KDBUS_ITEM_KERNEL_BASE] = translate_reply, | |
1302 | }; | |
1303 | ||
76877fb9 LP |
1304 | struct kdbus_item *d, *found = NULL; |
1305 | struct kdbus_timestamp *ts = NULL; | |
1306 | ||
cb67f718 DM |
1307 | assert(bus); |
1308 | assert(k); | |
1309 | assert(k->payload_type == KDBUS_PAYLOAD_KERNEL); | |
1310 | ||
1311 | KDBUS_ITEM_FOREACH(d, k, items) { | |
856d6e09 | 1312 | if (d->type == KDBUS_ITEM_TIMESTAMP) |
76877fb9 | 1313 | ts = &d->timestamp; |
856d6e09 | 1314 | |
cb67f718 DM |
1315 | if (d->type >= _KDBUS_ITEM_KERNEL_BASE && d->type < _KDBUS_ITEM_KERNEL_BASE + ELEMENTSOF(translate)) { |
1316 | if (found) | |
1317 | return -EBADMSG; | |
1318 | found = d; | |
1319 | } else | |
1320 | log_debug("Got unknown field from kernel %llu", d->type); | |
1307c3ff LP |
1321 | } |
1322 | ||
cb67f718 DM |
1323 | if (!found) { |
1324 | log_debug("Didn't find a kernel message to translate."); | |
1325 | return 0; | |
1326 | } | |
1327 | ||
76877fb9 | 1328 | return translate[found->type - _KDBUS_ITEM_KERNEL_BASE](bus, k, found, ts); |
6629161f LP |
1329 | } |
1330 | ||
766c5809 | 1331 | int bus_kernel_read_message(sd_bus *bus, bool hint_priority, int64_t priority) { |
94e15fdc | 1332 | struct kdbus_cmd_recv recv = { .size = sizeof(recv) }; |
6629161f | 1333 | struct kdbus_msg *k; |
6629161f LP |
1334 | int r; |
1335 | ||
1336 | assert(bus); | |
7d22c717 | 1337 | |
7adc46fc | 1338 | r = bus_rqueue_make_room(bus); |
7d22c717 LP |
1339 | if (r < 0) |
1340 | return r; | |
6629161f | 1341 | |
766c5809 LP |
1342 | if (hint_priority) { |
1343 | recv.flags |= KDBUS_RECV_USE_PRIORITY; | |
1344 | recv.priority = priority; | |
1345 | } | |
1346 | ||
94e15fdc | 1347 | r = ioctl(bus->input_fd, KDBUS_CMD_RECV, &recv); |
fd8d62d9 | 1348 | if (r < 0) { |
6629161f LP |
1349 | if (errno == EAGAIN) |
1350 | return 0; | |
1351 | ||
f9a458c6 LP |
1352 | if (errno == EOVERFLOW) { |
1353 | log_debug("%s: kdbus reports %" PRIu64 " dropped broadcast messages, ignoring.", strna(bus->description), (uint64_t) recv.dropped_msgs); | |
1354 | return 0; | |
1355 | } | |
1356 | ||
fd8d62d9 | 1357 | return -errno; |
6629161f LP |
1358 | } |
1359 | ||
a9c8343e | 1360 | k = (struct kdbus_msg *)((uint8_t *)bus->kdbus_buffer + recv.msg.offset); |
e1d337d4 | 1361 | if (k->payload_type == KDBUS_PAYLOAD_DBUS) { |
7d22c717 | 1362 | r = bus_kernel_make_message(bus, k); |
e1d337d4 LP |
1363 | |
1364 | /* Anybody can send us invalid messages, let's just drop them. */ | |
1365 | if (r == -EBADMSG || r == -EPROTOTYPE) { | |
da927ba9 | 1366 | log_debug_errno(r, "Ignoring invalid message: %m"); |
e1d337d4 LP |
1367 | r = 0; |
1368 | } | |
1369 | ||
1370 | } else if (k->payload_type == KDBUS_PAYLOAD_KERNEL) | |
7d22c717 | 1371 | r = bus_kernel_translate_message(bus, k); |
069f5e61 LP |
1372 | else { |
1373 | log_debug("Ignoring message with unknown payload type %llu.", (unsigned long long) k->payload_type); | |
777d7a61 | 1374 | r = 0; |
069f5e61 | 1375 | } |
777d7a61 | 1376 | |
fd8d62d9 LP |
1377 | if (r <= 0) |
1378 | close_kdbus_msg(bus, k); | |
6629161f | 1379 | |
51038c03 | 1380 | return r < 0 ? r : 1; |
6629161f LP |
1381 | } |
1382 | ||
8e959fbf | 1383 | int bus_kernel_pop_memfd(sd_bus *bus, void **address, size_t *mapped, size_t *allocated) { |
bc7fd8cd | 1384 | struct memfd_cache *c; |
45fbe937 | 1385 | int fd; |
bc7fd8cd LP |
1386 | |
1387 | assert(address); | |
8e959fbf LP |
1388 | assert(mapped); |
1389 | assert(allocated); | |
35460afc LP |
1390 | |
1391 | if (!bus || !bus->is_kernel) | |
1392 | return -ENOTSUP; | |
bc7fd8cd | 1393 | |
76b7742c | 1394 | assert_se(pthread_mutex_lock(&bus->memfd_cache_mutex) >= 0); |
45fbe937 | 1395 | |
bc7fd8cd | 1396 | if (bus->n_memfd_cache <= 0) { |
45fbe937 LP |
1397 | int r; |
1398 | ||
76b7742c | 1399 | assert_se(pthread_mutex_unlock(&bus->memfd_cache_mutex) >= 0); |
bc7fd8cd | 1400 | |
455971c1 | 1401 | r = memfd_new(bus->description); |
9b05bc48 | 1402 | if (r < 0) |
73843b52 | 1403 | return r; |
bc7fd8cd LP |
1404 | |
1405 | *address = NULL; | |
8e959fbf LP |
1406 | *mapped = 0; |
1407 | *allocated = 0; | |
a6082d77 | 1408 | return r; |
bc7fd8cd LP |
1409 | } |
1410 | ||
bf30e48f | 1411 | c = &bus->memfd_cache[--bus->n_memfd_cache]; |
bc7fd8cd LP |
1412 | |
1413 | assert(c->fd >= 0); | |
8e959fbf | 1414 | assert(c->mapped == 0 || c->address); |
bc7fd8cd LP |
1415 | |
1416 | *address = c->address; | |
8e959fbf LP |
1417 | *mapped = c->mapped; |
1418 | *allocated = c->allocated; | |
45fbe937 LP |
1419 | fd = c->fd; |
1420 | ||
76b7742c | 1421 | assert_se(pthread_mutex_unlock(&bus->memfd_cache_mutex) >= 0); |
bc7fd8cd | 1422 | |
45fbe937 LP |
1423 | return fd; |
1424 | } | |
1425 | ||
1426 | static void close_and_munmap(int fd, void *address, size_t size) { | |
1427 | if (size > 0) | |
76b7742c | 1428 | assert_se(munmap(address, PAGE_ALIGN(size)) >= 0); |
45fbe937 | 1429 | |
03e334a1 | 1430 | safe_close(fd); |
bc7fd8cd LP |
1431 | } |
1432 | ||
8e959fbf | 1433 | void bus_kernel_push_memfd(sd_bus *bus, int fd, void *address, size_t mapped, size_t allocated) { |
bc7fd8cd | 1434 | struct memfd_cache *c; |
8e959fbf | 1435 | uint64_t max_mapped = PAGE_ALIGN(MEMFD_CACHE_ITEM_SIZE_MAX); |
bc7fd8cd LP |
1436 | |
1437 | assert(fd >= 0); | |
8e959fbf | 1438 | assert(mapped == 0 || address); |
bc7fd8cd | 1439 | |
45fbe937 | 1440 | if (!bus || !bus->is_kernel) { |
8e959fbf | 1441 | close_and_munmap(fd, address, mapped); |
45fbe937 LP |
1442 | return; |
1443 | } | |
1444 | ||
76b7742c | 1445 | assert_se(pthread_mutex_lock(&bus->memfd_cache_mutex) >= 0); |
bc7fd8cd | 1446 | |
45fbe937 | 1447 | if (bus->n_memfd_cache >= ELEMENTSOF(bus->memfd_cache)) { |
76b7742c | 1448 | assert_se(pthread_mutex_unlock(&bus->memfd_cache_mutex) >= 0); |
bc7fd8cd | 1449 | |
8e959fbf | 1450 | close_and_munmap(fd, address, mapped); |
bc7fd8cd LP |
1451 | return; |
1452 | } | |
1453 | ||
1454 | c = &bus->memfd_cache[bus->n_memfd_cache++]; | |
1455 | c->fd = fd; | |
1456 | c->address = address; | |
1457 | ||
1458 | /* If overly long, let's return a bit to the OS */ | |
8e959fbf | 1459 | if (mapped > max_mapped) { |
73843b52 | 1460 | assert_se(memfd_set_size(fd, max_mapped) >= 0); |
8e959fbf LP |
1461 | assert_se(munmap((uint8_t*) address + max_mapped, PAGE_ALIGN(mapped - max_mapped)) >= 0); |
1462 | c->mapped = c->allocated = max_mapped; | |
1463 | } else { | |
1464 | c->mapped = mapped; | |
1465 | c->allocated = allocated; | |
1466 | } | |
45fbe937 | 1467 | |
76b7742c | 1468 | assert_se(pthread_mutex_unlock(&bus->memfd_cache_mutex) >= 0); |
bc7fd8cd LP |
1469 | } |
1470 | ||
1471 | void bus_kernel_flush_memfd(sd_bus *b) { | |
1472 | unsigned i; | |
1473 | ||
1474 | assert(b); | |
1475 | ||
76b7742c | 1476 | for (i = 0; i < b->n_memfd_cache; i++) |
8e959fbf | 1477 | close_and_munmap(b->memfd_cache[i].fd, b->memfd_cache[i].address, b->memfd_cache[i].mapped); |
bc7fd8cd | 1478 | } |
0253ddcc | 1479 | |
b5dae4c7 | 1480 | uint64_t request_name_flags_to_kdbus(uint64_t flags) { |
e3dd987c | 1481 | uint64_t f = 0; |
0253ddcc | 1482 | |
e3dd987c LP |
1483 | if (flags & SD_BUS_NAME_ALLOW_REPLACEMENT) |
1484 | f |= KDBUS_NAME_ALLOW_REPLACEMENT; | |
0253ddcc | 1485 | |
e3dd987c LP |
1486 | if (flags & SD_BUS_NAME_REPLACE_EXISTING) |
1487 | f |= KDBUS_NAME_REPLACE_EXISTING; | |
0253ddcc | 1488 | |
d90bb669 | 1489 | if (flags & SD_BUS_NAME_QUEUE) |
e3dd987c | 1490 | f |= KDBUS_NAME_QUEUE; |
0253ddcc | 1491 | |
b5dae4c7 | 1492 | return f; |
e3dd987c LP |
1493 | } |
1494 | ||
b5dae4c7 | 1495 | uint64_t attach_flags_to_kdbus(uint64_t mask) { |
e3dd987c LP |
1496 | uint64_t m = 0; |
1497 | ||
705a415f LP |
1498 | if (mask & (SD_BUS_CREDS_UID|SD_BUS_CREDS_EUID|SD_BUS_CREDS_SUID|SD_BUS_CREDS_FSUID| |
1499 | SD_BUS_CREDS_GID|SD_BUS_CREDS_EGID|SD_BUS_CREDS_SGID|SD_BUS_CREDS_FSGID)) | |
e3dd987c LP |
1500 | m |= KDBUS_ATTACH_CREDS; |
1501 | ||
32802361 | 1502 | if (mask & (SD_BUS_CREDS_PID|SD_BUS_CREDS_TID)) |
705a415f LP |
1503 | m |= KDBUS_ATTACH_PIDS; |
1504 | ||
a2243d54 DM |
1505 | if (mask & SD_BUS_CREDS_COMM) |
1506 | m |= KDBUS_ATTACH_PID_COMM; | |
1507 | ||
1508 | if (mask & SD_BUS_CREDS_TID_COMM) | |
1509 | m |= KDBUS_ATTACH_TID_COMM; | |
e3dd987c LP |
1510 | |
1511 | if (mask & SD_BUS_CREDS_EXE) | |
1512 | m |= KDBUS_ATTACH_EXE; | |
1513 | ||
1514 | if (mask & SD_BUS_CREDS_CMDLINE) | |
1515 | m |= KDBUS_ATTACH_CMDLINE; | |
1516 | ||
1517 | 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)) | |
1518 | m |= KDBUS_ATTACH_CGROUP; | |
1519 | ||
1520 | if (mask & (SD_BUS_CREDS_EFFECTIVE_CAPS|SD_BUS_CREDS_PERMITTED_CAPS|SD_BUS_CREDS_INHERITABLE_CAPS|SD_BUS_CREDS_BOUNDING_CAPS)) | |
1521 | m |= KDBUS_ATTACH_CAPS; | |
1522 | ||
1523 | if (mask & SD_BUS_CREDS_SELINUX_CONTEXT) | |
1524 | m |= KDBUS_ATTACH_SECLABEL; | |
0253ddcc | 1525 | |
e3dd987c LP |
1526 | if (mask & (SD_BUS_CREDS_AUDIT_SESSION_ID|SD_BUS_CREDS_AUDIT_LOGIN_UID)) |
1527 | m |= KDBUS_ATTACH_AUDIT; | |
1528 | ||
49b832c5 LP |
1529 | if (mask & SD_BUS_CREDS_WELL_KNOWN_NAMES) |
1530 | m |= KDBUS_ATTACH_NAMES; | |
1531 | ||
455971c1 | 1532 | if (mask & SD_BUS_CREDS_DESCRIPTION) |
635f9f0d | 1533 | m |= KDBUS_ATTACH_CONN_DESCRIPTION; |
cccb0b2c | 1534 | |
02581590 LP |
1535 | if (mask & SD_BUS_CREDS_SUPPLEMENTARY_GIDS) |
1536 | m |= KDBUS_ATTACH_AUXGROUPS; | |
1537 | ||
b5dae4c7 | 1538 | return m; |
0253ddcc | 1539 | } |
e3dd987c | 1540 | |
f2769777 | 1541 | int bus_kernel_create_bus(const char *name, bool world, char **s) { |
b2086f60 | 1542 | struct kdbus_cmd *make; |
e3dd987c | 1543 | struct kdbus_item *n; |
fa7796e9 | 1544 | size_t l; |
e3dd987c LP |
1545 | int fd; |
1546 | ||
1547 | assert(name); | |
1548 | assert(s); | |
1549 | ||
63cc4c31 | 1550 | fd = open("/sys/fs/kdbus/control", O_RDWR|O_NOCTTY|O_CLOEXEC); |
e3dd987c LP |
1551 | if (fd < 0) |
1552 | return -errno; | |
1553 | ||
fa7796e9 | 1554 | l = strlen(name); |
b2086f60 | 1555 | make = alloca0_align(offsetof(struct kdbus_cmd, items) + |
fa7796e9 LP |
1556 | ALIGN8(offsetof(struct kdbus_item, bloom_parameter) + sizeof(struct kdbus_bloom_parameter)) + |
1557 | ALIGN8(offsetof(struct kdbus_item, data64) + sizeof(uint64_t)) + | |
19ee32dc | 1558 | ALIGN8(offsetof(struct kdbus_item, data64) + sizeof(uint64_t)) + |
fa7796e9 | 1559 | ALIGN8(offsetof(struct kdbus_item, str) + DECIMAL_STR_MAX(uid_t) + 1 + l + 1), |
7f3d3ba1 | 1560 | 8); |
e3dd987c | 1561 | |
b2086f60 | 1562 | make->size = offsetof(struct kdbus_cmd, items); |
816a3f9e | 1563 | |
fa7796e9 | 1564 | /* Set the bloom parameters */ |
e3dd987c | 1565 | n = make->items; |
18a28147 KS |
1566 | n->size = offsetof(struct kdbus_item, bloom_parameter) + |
1567 | sizeof(struct kdbus_bloom_parameter); | |
1568 | n->type = KDBUS_ITEM_BLOOM_PARAMETER; | |
b28ff39f LP |
1569 | n->bloom_parameter.size = DEFAULT_BLOOM_SIZE; |
1570 | n->bloom_parameter.n_hash = DEFAULT_BLOOM_N_HASH; | |
1571 | ||
1572 | assert_cc(DEFAULT_BLOOM_SIZE > 0); | |
1573 | assert_cc(DEFAULT_BLOOM_N_HASH > 0); | |
1574 | ||
816a3f9e DM |
1575 | make->size += ALIGN8(n->size); |
1576 | ||
fa7796e9 LP |
1577 | /* The busses we create make no restrictions on what metadata |
1578 | * peers can read from incoming messages. */ | |
1579 | n = KDBUS_ITEM_NEXT(n); | |
1580 | n->type = KDBUS_ITEM_ATTACH_FLAGS_RECV; | |
1581 | n->size = offsetof(struct kdbus_item, data64) + sizeof(uint64_t); | |
19ee32dc DH |
1582 | n->data64[0] = _KDBUS_ATTACH_ANY; |
1583 | make->size += ALIGN8(n->size); | |
1584 | ||
1585 | /* Provide all metadata via bus-owner queries */ | |
1586 | n = KDBUS_ITEM_NEXT(n); | |
1587 | n->type = KDBUS_ITEM_ATTACH_FLAGS_SEND; | |
1588 | n->size = offsetof(struct kdbus_item, data64) + sizeof(uint64_t); | |
fa7796e9 LP |
1589 | n->data64[0] = _KDBUS_ATTACH_ANY; |
1590 | make->size += ALIGN8(n->size); | |
1591 | ||
1592 | /* Set the a good name */ | |
816a3f9e | 1593 | n = KDBUS_ITEM_NEXT(n); |
a4152e3f | 1594 | sprintf(n->str, UID_FMT "-%s", getuid(), name); |
e3dd987c | 1595 | n->size = offsetof(struct kdbus_item, str) + strlen(n->str) + 1; |
5e16c257 | 1596 | n->type = KDBUS_ITEM_MAKE_NAME; |
816a3f9e | 1597 | make->size += ALIGN8(n->size); |
e3dd987c | 1598 | |
f7c7cd03 | 1599 | make->flags = world ? KDBUS_MAKE_ACCESS_WORLD : 0; |
e3dd987c LP |
1600 | |
1601 | if (ioctl(fd, KDBUS_CMD_BUS_MAKE, make) < 0) { | |
03e334a1 | 1602 | safe_close(fd); |
e3dd987c LP |
1603 | return -errno; |
1604 | } | |
1605 | ||
1606 | if (s) { | |
1607 | char *p; | |
1608 | ||
63cc4c31 | 1609 | p = strjoin("/sys/fs/kdbus/", n->str, "/bus", NULL); |
e3dd987c | 1610 | if (!p) { |
03e334a1 | 1611 | safe_close(fd); |
e3dd987c LP |
1612 | return -ENOMEM; |
1613 | } | |
1614 | ||
1615 | *s = p; | |
1616 | } | |
1617 | ||
1618 | return fd; | |
1619 | } | |
9bd37b40 | 1620 | |
8f077bf9 | 1621 | int bus_kernel_open_bus_fd(const char *bus, char **path) { |
a4152e3f LP |
1622 | char *p; |
1623 | int fd; | |
8f077bf9 | 1624 | size_t len; |
1683342a | 1625 | |
8aee3fc7 LP |
1626 | assert(bus); |
1627 | ||
63cc4c31 | 1628 | len = strlen("/sys/fs/kdbus/") + DECIMAL_STR_MAX(uid_t) + 1 + strlen(bus) + strlen("/bus") + 1; |
8f077bf9 ZJS |
1629 | |
1630 | if (path) { | |
8aee3fc7 | 1631 | p = new(char, len); |
8f077bf9 ZJS |
1632 | if (!p) |
1633 | return -ENOMEM; | |
8f077bf9 | 1634 | } else |
8aee3fc7 LP |
1635 | p = newa(char, len); |
1636 | ||
63cc4c31 | 1637 | sprintf(p, "/sys/fs/kdbus/" UID_FMT "-%s/bus", getuid(), bus); |
1683342a | 1638 | |
a4152e3f | 1639 | fd = open(p, O_RDWR|O_NOCTTY|O_CLOEXEC); |
8aee3fc7 LP |
1640 | if (fd < 0) { |
1641 | if (path) | |
1642 | free(p); | |
1643 | ||
a4152e3f | 1644 | return -errno; |
8aee3fc7 LP |
1645 | } |
1646 | ||
1647 | if (path) | |
1648 | *path = p; | |
a4152e3f LP |
1649 | |
1650 | return fd; | |
1683342a DM |
1651 | } |
1652 | ||
e7d718af | 1653 | int bus_kernel_create_endpoint(const char *bus_name, const char *ep_name, char **ep_path) { |
8e00bfc2 | 1654 | _cleanup_free_ char *path = NULL; |
b2086f60 | 1655 | struct kdbus_cmd *make; |
e7d718af | 1656 | struct kdbus_item *n; |
342f3005 | 1657 | const char *name; |
e7d718af DM |
1658 | int fd; |
1659 | ||
1660 | fd = bus_kernel_open_bus_fd(bus_name, &path); | |
1661 | if (fd < 0) | |
1662 | return fd; | |
1663 | ||
b2086f60 | 1664 | make = alloca0_align(ALIGN8(offsetof(struct kdbus_cmd, items)) + |
342f3005 DH |
1665 | ALIGN8(offsetof(struct kdbus_item, str) + DECIMAL_STR_MAX(uid_t) + 1 + strlen(ep_name) + 1), |
1666 | 8); | |
b2086f60 | 1667 | make->size = ALIGN8(offsetof(struct kdbus_cmd, items)); |
e7d718af DM |
1668 | make->flags = KDBUS_MAKE_ACCESS_WORLD; |
1669 | ||
1670 | n = make->items; | |
342f3005 DH |
1671 | sprintf(n->str, UID_FMT "-%s", getuid(), ep_name); |
1672 | n->size = offsetof(struct kdbus_item, str) + strlen(n->str) + 1; | |
e7d718af | 1673 | n->type = KDBUS_ITEM_MAKE_NAME; |
342f3005 DH |
1674 | make->size += ALIGN8(n->size); |
1675 | name = n->str; | |
e7d718af | 1676 | |
40885bb2 | 1677 | if (ioctl(fd, KDBUS_CMD_ENDPOINT_MAKE, make) < 0) { |
e7d718af DM |
1678 | safe_close(fd); |
1679 | return -errno; | |
1680 | } | |
1681 | ||
e7d718af | 1682 | if (ep_path) { |
2c652b6b LP |
1683 | char *p; |
1684 | ||
342f3005 | 1685 | p = strjoin(dirname(path), "/", name, NULL); |
2c652b6b | 1686 | if (!p) { |
4edf33d1 | 1687 | safe_close(fd); |
e7d718af | 1688 | return -ENOMEM; |
4edf33d1 | 1689 | } |
2c652b6b LP |
1690 | |
1691 | *ep_path = p; | |
e7d718af DM |
1692 | } |
1693 | ||
1694 | return fd; | |
1695 | } | |
1696 | ||
ae095f86 | 1697 | int bus_kernel_try_close(sd_bus *bus) { |
b2086f60 DH |
1698 | struct kdbus_cmd byebye = { .size = sizeof(byebye) }; |
1699 | ||
ae095f86 LP |
1700 | assert(bus); |
1701 | assert(bus->is_kernel); | |
1702 | ||
b2086f60 | 1703 | if (ioctl(bus->input_fd, KDBUS_CMD_BYEBYE, &byebye) < 0) |
ae095f86 LP |
1704 | return -errno; |
1705 | ||
1706 | return 0; | |
1707 | } | |
ff975efb LP |
1708 | |
1709 | int bus_kernel_drop_one(int fd) { | |
1710 | struct kdbus_cmd_recv recv = { | |
94e15fdc DH |
1711 | .size = sizeof(recv), |
1712 | .flags = KDBUS_RECV_DROP, | |
ff975efb LP |
1713 | }; |
1714 | ||
1715 | assert(fd >= 0); | |
1716 | ||
94e15fdc | 1717 | if (ioctl(fd, KDBUS_CMD_RECV, &recv) < 0) |
ff975efb LP |
1718 | return -errno; |
1719 | ||
1720 | return 0; | |
1721 | } | |
b5dae4c7 LP |
1722 | |
1723 | int bus_kernel_realize_attach_flags(sd_bus *bus) { | |
b2086f60 | 1724 | struct kdbus_cmd *update; |
b5dae4c7 LP |
1725 | struct kdbus_item *n; |
1726 | ||
1727 | assert(bus); | |
1728 | assert(bus->is_kernel); | |
1729 | ||
b2086f60 | 1730 | update = alloca0_align(offsetof(struct kdbus_cmd, items) + |
fa7796e9 LP |
1731 | ALIGN8(offsetof(struct kdbus_item, data64) + sizeof(uint64_t)), |
1732 | 8); | |
b5dae4c7 LP |
1733 | |
1734 | n = update->items; | |
1735 | n->type = KDBUS_ITEM_ATTACH_FLAGS_RECV; | |
1736 | n->size = offsetof(struct kdbus_item, data64) + sizeof(uint64_t); | |
1737 | n->data64[0] = bus->attach_flags; | |
1738 | ||
fa7796e9 | 1739 | update->size = |
b2086f60 | 1740 | offsetof(struct kdbus_cmd, items) + |
fa7796e9 | 1741 | ALIGN8(n->size); |
b5dae4c7 | 1742 | |
b2086f60 | 1743 | if (ioctl(bus->input_fd, KDBUS_CMD_UPDATE, update) < 0) |
b5dae4c7 LP |
1744 | return -errno; |
1745 | ||
1746 | return 0; | |
1747 | } | |
1a299299 LP |
1748 | |
1749 | int bus_kernel_fix_attach_mask(void) { | |
1750 | _cleanup_free_ char *mask = NULL; | |
412c18f1 | 1751 | uint64_t m = (uint64_t) -1; |
1a299299 LP |
1752 | char buf[2+16+2]; |
1753 | int r; | |
1754 | ||
412c18f1 LP |
1755 | /* By default we don't want any kdbus metadata fields to be |
1756 | * suppressed, hence we reset the kernel mask for it to | |
314808ce DH |
1757 | * (uint64_t) -1. If the module argument was overwritten by |
1758 | * the kernel cmdline, we leave it as is. */ | |
412c18f1 | 1759 | |
314808ce | 1760 | r = get_proc_cmdline_key("kdbus.attach_flags_mask=", &mask); |
1214b53c LP |
1761 | if (r < 0) |
1762 | return log_warning_errno(r, "Failed to read kernel command line: %m"); | |
1a299299 | 1763 | |
314808ce DH |
1764 | if (r == 0) { |
1765 | sprintf(buf, "0x%" PRIx64 "\n", m); | |
1766 | r = write_string_file("/sys/module/kdbus/parameters/attach_flags_mask", buf); | |
1767 | if (r < 0) | |
1768 | return log_full_errno(IN_SET(r, -ENOENT, -EROFS) ? LOG_DEBUG : LOG_WARNING, r, | |
1769 | "Failed to write kdbus attach mask: %m"); | |
1a299299 LP |
1770 | } |
1771 | ||
1a299299 LP |
1772 | return 0; |
1773 | } | |
3acc1daf LP |
1774 | |
1775 | int bus_kernel_get_bus_name(sd_bus *bus, char **name) { | |
1776 | struct kdbus_cmd_info cmd = { | |
1777 | .size = sizeof(struct kdbus_cmd_info), | |
1778 | }; | |
1779 | struct kdbus_info *info; | |
1780 | struct kdbus_item *item; | |
1781 | char *n = NULL; | |
1782 | int r; | |
1783 | ||
1784 | assert(bus); | |
1785 | assert(name); | |
1786 | assert(bus->is_kernel); | |
1787 | ||
1788 | r = ioctl(bus->input_fd, KDBUS_CMD_BUS_CREATOR_INFO, &cmd); | |
1789 | if (r < 0) | |
1790 | return -errno; | |
1791 | ||
1792 | info = (struct kdbus_info*) ((uint8_t*) bus->kdbus_buffer + cmd.offset); | |
1793 | ||
1794 | KDBUS_ITEM_FOREACH(item, info, items) | |
1795 | if (item->type == KDBUS_ITEM_MAKE_NAME) { | |
1796 | r = free_and_strdup(&n, item->str); | |
1797 | break; | |
1798 | } | |
1799 | ||
1800 | bus_kernel_cmd_free(bus, cmd.offset); | |
1801 | ||
1802 | if (r < 0) | |
1803 | return r; | |
1804 | if (!n) | |
1805 | return -EIO; | |
1806 | ||
1807 | *name = n; | |
1808 | return 0; | |
1809 | } |