1 /*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/
4 This file is part of systemd.
6 Copyright 2013 Lennart Poettering
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.
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.
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/>.
22 #ifdef HAVE_VALGRIND_MEMCHECK_H
23 #include <valgrind/memcheck.h>
30 #include <sys/prctl.h>
34 #include "memfd-util.h"
35 #include "cgroup-util.h"
38 #include "bus-internal.h"
39 #include "bus-message.h"
40 #include "bus-kernel.h"
41 #include "bus-bloom.h"
43 #include "bus-label.h"
45 #define UNIQUE_NAME_MAX (3+DECIMAL_STR_MAX(uint64_t))
47 int bus_kernel_parse_unique_name(const char *s, uint64_t *id) {
53 if (!startswith(s, ":1."))
56 r = safe_atou64(s + 3, id);
63 static void append_payload_vec(struct kdbus_item **d, const void *p, size_t sz) {
69 /* Note that p can be NULL, which encodes a region full of
70 * zeroes, which is useful to optimize certain padding
73 (*d)->size = offsetof(struct kdbus_item, vec) + sizeof(struct kdbus_vec);
74 (*d)->type = KDBUS_ITEM_PAYLOAD_VEC;
75 (*d)->vec.address = PTR_TO_UINT64(p);
78 *d = (struct kdbus_item *) ((uint8_t*) *d + (*d)->size);
81 static void append_payload_memfd(struct kdbus_item **d, int memfd, size_t start, size_t sz) {
87 (*d)->size = offsetof(struct kdbus_item, memfd) + sizeof(struct kdbus_memfd);
88 (*d)->type = KDBUS_ITEM_PAYLOAD_MEMFD;
89 (*d)->memfd.fd = memfd;
90 (*d)->memfd.start = start;
91 (*d)->memfd.size = sz;
93 *d = (struct kdbus_item *) ((uint8_t*) *d + (*d)->size);
96 static void append_destination(struct kdbus_item **d, const char *s, size_t length) {
102 (*d)->size = offsetof(struct kdbus_item, str) + length + 1;
103 (*d)->type = KDBUS_ITEM_DST_NAME;
104 memcpy((*d)->str, s, length + 1);
106 *d = (struct kdbus_item *) ((uint8_t*) *d + (*d)->size);
109 static struct kdbus_bloom_filter *append_bloom(struct kdbus_item **d, size_t length) {
110 struct kdbus_item *i;
116 i->size = offsetof(struct kdbus_item, bloom_filter) +
117 offsetof(struct kdbus_bloom_filter, data) +
119 i->type = KDBUS_ITEM_BLOOM_FILTER;
121 *d = (struct kdbus_item *) ((uint8_t*) i + i->size);
123 return &i->bloom_filter;
126 static void append_fds(struct kdbus_item **d, const int fds[], unsigned n_fds) {
132 (*d)->size = offsetof(struct kdbus_item, fds) + sizeof(int) * n_fds;
133 (*d)->type = KDBUS_ITEM_FDS;
134 memcpy((*d)->fds, fds, sizeof(int) * n_fds);
136 *d = (struct kdbus_item *) ((uint8_t*) *d + (*d)->size);
139 static void add_bloom_arg(void *data, size_t size, unsigned n_hash, unsigned i, const char *t) {
140 char buf[sizeof("arg")-1 + 2 + sizeof("-slash-prefix")];
148 e = stpcpy(buf, "arg");
150 *(e++) = '0' + (char) i;
152 *(e++) = '0' + (char) (i / 10);
153 *(e++) = '0' + (char) (i % 10);
157 bloom_add_pair(data, size, n_hash, buf, t);
159 strcpy(e, "-dot-prefix");
160 bloom_add_prefixes(data, size, n_hash, buf, t, '.');
161 strcpy(e, "-slash-prefix");
162 bloom_add_prefixes(data, size, n_hash, buf, t, '/');
165 static int bus_message_setup_bloom(sd_bus_message *m, struct kdbus_bloom_filter *bloom) {
174 memzero(data, m->bus->bloom_size);
175 bloom->generation = 0;
177 bloom_add_pair(data, m->bus->bloom_size, m->bus->bloom_n_hash, "message-type", bus_message_type_to_string(m->header->type));
180 bloom_add_pair(data, m->bus->bloom_size, m->bus->bloom_n_hash, "interface", m->interface);
182 bloom_add_pair(data, m->bus->bloom_size, m->bus->bloom_n_hash, "member", m->member);
184 bloom_add_pair(data, m->bus->bloom_size, m->bus->bloom_n_hash, "path", m->path);
185 bloom_add_pair(data, m->bus->bloom_size, m->bus->bloom_n_hash, "path-slash-prefix", m->path);
186 bloom_add_prefixes(data, m->bus->bloom_size, m->bus->bloom_n_hash, "path-slash-prefix", m->path, '/');
189 r = sd_bus_message_rewind(m, true);
193 for (i = 0; i < 64; i++) {
194 const char *t, *contents;
197 r = sd_bus_message_peek_type(m, &type, &contents);
201 if (IN_SET(type, SD_BUS_TYPE_STRING, SD_BUS_TYPE_OBJECT_PATH, SD_BUS_TYPE_SIGNATURE)) {
203 /* The bloom filter includes simple strings of any kind */
204 r = sd_bus_message_read_basic(m, type, &t);
208 add_bloom_arg(data, m->bus->bloom_size, m->bus->bloom_n_hash, i, t);
209 } if (type == SD_BUS_TYPE_ARRAY && STR_IN_SET(contents, "s", "o", "g")) {
211 /* As well as array of simple strings of any kinds */
212 r = sd_bus_message_enter_container(m, type, contents);
216 while ((r = sd_bus_message_read_basic(m, contents[0], &t)) > 0)
217 add_bloom_arg(data, m->bus->bloom_size, m->bus->bloom_n_hash, i, t);
221 r = sd_bus_message_exit_container(m);
226 /* Stop adding to bloom filter as soon as we
227 * run into the first argument we cannot add
235 static int bus_message_setup_kmsg(sd_bus *b, sd_bus_message *m) {
236 struct bus_body_part *part;
237 struct kdbus_item *d;
238 const char *destination;
249 /* We put this together only once, if this message is reused
250 * we reuse the earlier-built version */
254 destination = m->destination ?: m->destination_ptr;
257 r = bus_kernel_parse_unique_name(destination, &unique);
265 sz = offsetof(struct kdbus_msg, items);
267 /* Add in fixed header, fields header and payload */
268 sz += (1 + m->n_body_parts) * ALIGN8(offsetof(struct kdbus_item, vec) +
269 MAX(sizeof(struct kdbus_vec),
270 sizeof(struct kdbus_memfd)));
272 /* Add space for bloom filter */
273 sz += ALIGN8(offsetof(struct kdbus_item, bloom_filter) +
274 offsetof(struct kdbus_bloom_filter, data) +
277 /* Add in well-known destination header */
279 dl = strlen(destination);
280 sz += ALIGN8(offsetof(struct kdbus_item, str) + dl + 1);
283 /* Add space for unix fds */
285 sz += ALIGN8(offsetof(struct kdbus_item, fds) + sizeof(int)*m->n_fds);
287 m->kdbus = memalign(8, sz);
293 m->free_kdbus = true;
294 memzero(m->kdbus, sz);
297 ((m->header->flags & BUS_MESSAGE_NO_REPLY_EXPECTED) ? 0 : KDBUS_MSG_EXPECT_REPLY) |
298 ((m->header->flags & BUS_MESSAGE_NO_AUTO_START) ? KDBUS_MSG_NO_AUTO_START : 0);
301 /* verify_destination_id will usually be 0, which makes the kernel driver only look
302 * at the provided well-known name. Otherwise, the kernel will make sure the provided
303 * destination id matches the owner of the provided weel-known-name, and fail if they
304 * differ. Currently, this is only needed for bus-proxyd. */
305 m->kdbus->dst_id = m->verify_destination_id;
307 m->kdbus->dst_id = destination ? unique : KDBUS_DST_ID_BROADCAST;
309 m->kdbus->payload_type = KDBUS_PAYLOAD_DBUS;
310 m->kdbus->cookie = (uint64_t) m->header->serial;
311 m->kdbus->priority = m->priority;
313 if (m->header->flags & BUS_MESSAGE_NO_REPLY_EXPECTED)
314 m->kdbus->cookie_reply = m->reply_cookie;
318 assert_se(clock_gettime(CLOCK_MONOTONIC_COARSE, &now) == 0);
319 m->kdbus->timeout_ns = now.tv_sec * NSEC_PER_SEC + now.tv_nsec +
320 m->timeout * NSEC_PER_USEC;
326 append_destination(&d, destination, dl);
328 append_payload_vec(&d, m->header, BUS_MESSAGE_BODY_BEGIN(m));
330 MESSAGE_FOREACH_PART(part, i, m) {
332 /* If this is padding then simply send a
333 * vector with a NULL data pointer which the
334 * kernel will just pass through. This is the
335 * most efficient way to encode zeroes */
337 append_payload_vec(&d, NULL, part->size);
341 if (part->memfd >= 0 && part->sealed && destination) {
342 /* Try to send a memfd, if the part is
343 * sealed and this is not a broadcast. Since we can only */
345 append_payload_memfd(&d, part->memfd, part->memfd_offset, part->size);
349 /* Otherwise, let's send a vector to the actual data.
350 * For that, we need to map it first. */
351 r = bus_body_part_map(part);
355 append_payload_vec(&d, part->data, part->size);
358 if (m->kdbus->dst_id == KDBUS_DST_ID_BROADCAST) {
359 struct kdbus_bloom_filter *bloom;
361 bloom = append_bloom(&d, m->bus->bloom_size);
362 r = bus_message_setup_bloom(m, bloom);
368 append_fds(&d, m->fds, m->n_fds);
370 m->kdbus->size = (uint8_t*) d - (uint8_t*) m->kdbus;
371 assert(m->kdbus->size <= sz);
380 static void bus_message_set_sender_driver(sd_bus *bus, sd_bus_message *m) {
384 m->sender = m->creds.unique_name = (char*) "org.freedesktop.DBus";
385 m->creds.well_known_names_driver = true;
386 m->creds.mask |= (SD_BUS_CREDS_UNIQUE_NAME|SD_BUS_CREDS_WELL_KNOWN_NAMES) & bus->creds_mask;
389 static void unset_memfds(struct sd_bus_message *m) {
390 struct bus_body_part *part;
395 /* Make sure the memfds are not freed twice */
396 MESSAGE_FOREACH_PART(part, i, m)
397 if (part->memfd >= 0)
401 static int bus_kernel_make_message(sd_bus *bus, struct kdbus_msg *k) {
402 sd_bus_message *m = NULL;
403 struct kdbus_item *d;
405 _cleanup_free_ int *fds = NULL;
406 struct bus_header *h = NULL;
407 size_t total, n_bytes = 0, idx = 0;
408 const char *destination = NULL, *seclabel = NULL;
413 assert(k->payload_type == KDBUS_PAYLOAD_DBUS);
415 KDBUS_ITEM_FOREACH(d, k, items) {
418 l = d->size - offsetof(struct kdbus_item, data);
422 case KDBUS_ITEM_PAYLOAD_OFF:
424 h = (struct bus_header *)((uint8_t *)bus->kdbus_buffer + d->vec.offset);
426 if (!bus_header_is_complete(h, d->vec.size))
430 n_bytes += d->vec.size;
433 case KDBUS_ITEM_PAYLOAD_MEMFD:
437 n_bytes += d->memfd.size;
440 case KDBUS_ITEM_FDS: {
445 f = realloc(fds, sizeof(int) * (n_fds + j));
450 memcpy(fds + n_fds, d->fds, sizeof(int) * j);
455 case KDBUS_ITEM_SECLABEL:
464 r = bus_header_message_size(h, &total);
468 if (n_bytes != total)
471 /* on kdbus we only speak native endian gvariant, never dbus1
472 * marshalling or reverse endian */
473 if (h->version != 2 ||
474 h->endian != BUS_NATIVE_ENDIAN)
477 r = bus_message_from_header(bus, h, sizeof(struct bus_header), fds, n_fds, NULL, seclabel, 0, &m);
481 /* The well-known names list is different from the other
482 credentials. If we asked for it, but nothing is there, this
483 means that the list of well-known names is simply empty, not
484 that we lack any data */
486 m->creds.mask |= (SD_BUS_CREDS_UNIQUE_NAME|SD_BUS_CREDS_WELL_KNOWN_NAMES) & bus->creds_mask;
488 KDBUS_ITEM_FOREACH(d, k, items) {
491 l = d->size - offsetof(struct kdbus_item, data);
495 case KDBUS_ITEM_PAYLOAD_OFF: {
498 begin_body = BUS_MESSAGE_BODY_BEGIN(m);
500 if (idx + d->vec.size > begin_body) {
501 struct bus_body_part *part;
503 /* Contains body material */
505 part = message_append_part(m);
511 /* A -1 offset is NUL padding. */
512 part->is_zero = d->vec.offset == ~0ULL;
514 if (idx >= begin_body) {
516 part->data = (uint8_t *)bus->kdbus_buffer + d->vec.offset;
517 part->size = d->vec.size;
520 part->data = (uint8_t *)bus->kdbus_buffer + d->vec.offset + (begin_body - idx);
521 part->size = d->vec.size - (begin_body - idx);
531 case KDBUS_ITEM_PAYLOAD_MEMFD: {
532 struct bus_body_part *part;
534 if (idx < BUS_MESSAGE_BODY_BEGIN(m)) {
539 part = message_append_part(m);
545 part->memfd = d->memfd.fd;
546 part->memfd_offset = d->memfd.start;
547 part->size = d->memfd.size;
550 idx += d->memfd.size;
554 case KDBUS_ITEM_PIDS:
556 /* The PID/TID might be missing, when the data
557 * is faked by some data bus proxy and it
558 * lacks that information about the real
559 * client since SO_PEERCRED is used for
562 if (d->pids.pid > 0) {
563 m->creds.pid = (pid_t) d->pids.pid;
564 m->creds.mask |= SD_BUS_CREDS_PID & bus->creds_mask;
567 if (d->pids.tid > 0) {
568 m->creds.tid = (pid_t) d->pids.tid;
569 m->creds.mask |= SD_BUS_CREDS_TID & bus->creds_mask;
574 case KDBUS_ITEM_CREDS:
576 /* EUID/SUID/FSUID/EGID/SGID/FSGID might be missing too (see above). */
578 if ((uid_t) d->creds.uid != UID_INVALID) {
579 m->creds.uid = (uid_t) d->creds.uid;
580 m->creds.mask |= SD_BUS_CREDS_UID & bus->creds_mask;
583 if ((uid_t) d->creds.euid != UID_INVALID) {
584 m->creds.euid = (uid_t) d->creds.euid;
585 m->creds.mask |= SD_BUS_CREDS_EUID & bus->creds_mask;
588 if ((uid_t) d->creds.suid != UID_INVALID) {
589 m->creds.suid = (uid_t) d->creds.suid;
590 m->creds.mask |= SD_BUS_CREDS_SUID & bus->creds_mask;
593 if ((uid_t) d->creds.fsuid != UID_INVALID) {
594 m->creds.fsuid = (uid_t) d->creds.fsuid;
595 m->creds.mask |= SD_BUS_CREDS_FSUID & bus->creds_mask;
598 if ((gid_t) d->creds.gid != GID_INVALID) {
599 m->creds.gid = (gid_t) d->creds.gid;
600 m->creds.mask |= SD_BUS_CREDS_GID & bus->creds_mask;
603 if ((gid_t) d->creds.egid != GID_INVALID) {
604 m->creds.egid = (gid_t) d->creds.egid;
605 m->creds.mask |= SD_BUS_CREDS_EGID & bus->creds_mask;
608 if ((gid_t) d->creds.sgid != GID_INVALID) {
609 m->creds.sgid = (gid_t) d->creds.sgid;
610 m->creds.mask |= SD_BUS_CREDS_SGID & bus->creds_mask;
613 if ((gid_t) d->creds.fsgid != GID_INVALID) {
614 m->creds.fsgid = (gid_t) d->creds.fsgid;
615 m->creds.mask |= SD_BUS_CREDS_FSGID & bus->creds_mask;
620 case KDBUS_ITEM_TIMESTAMP:
622 if (bus->attach_flags & KDBUS_ATTACH_TIMESTAMP) {
623 m->realtime = d->timestamp.realtime_ns / NSEC_PER_USEC;
624 m->monotonic = d->timestamp.monotonic_ns / NSEC_PER_USEC;
625 m->seqnum = d->timestamp.seqnum;
630 case KDBUS_ITEM_PID_COMM:
631 m->creds.comm = d->str;
632 m->creds.mask |= SD_BUS_CREDS_COMM & bus->creds_mask;
635 case KDBUS_ITEM_TID_COMM:
636 m->creds.tid_comm = d->str;
637 m->creds.mask |= SD_BUS_CREDS_TID_COMM & bus->creds_mask;
641 m->creds.exe = d->str;
642 m->creds.mask |= SD_BUS_CREDS_EXE & bus->creds_mask;
645 case KDBUS_ITEM_CMDLINE:
646 m->creds.cmdline = d->str;
647 m->creds.cmdline_size = l;
648 m->creds.mask |= SD_BUS_CREDS_CMDLINE & bus->creds_mask;
651 case KDBUS_ITEM_CGROUP:
652 m->creds.cgroup = d->str;
653 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;
655 r = bus_get_root_path(bus);
659 m->creds.cgroup_root = bus->cgroup_root;
663 case KDBUS_ITEM_AUDIT:
664 if ((uint32_t) d->audit.sessionid != (uint32_t) -1) {
665 m->creds.audit_session_id = (uint32_t) d->audit.sessionid;
666 m->creds.mask |= SD_BUS_CREDS_AUDIT_SESSION_ID & bus->creds_mask;
669 if ((uid_t) d->audit.loginuid != UID_INVALID) {
670 m->creds.audit_login_uid = (uid_t) d->audit.loginuid;
671 m->creds.mask |= SD_BUS_CREDS_AUDIT_LOGIN_UID & bus->creds_mask;
675 case KDBUS_ITEM_CAPS:
676 m->creds.capability = (uint8_t *) d->caps.caps;
677 m->creds.capability_size = d->size - offsetof(struct kdbus_item, caps.caps);
678 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;
681 case KDBUS_ITEM_DST_NAME:
682 if (!service_name_is_valid(d->str)) {
687 destination = d->str;
690 case KDBUS_ITEM_OWNED_NAME:
691 if (!service_name_is_valid(d->name.name)) {
696 if (bus->creds_mask & SD_BUS_CREDS_WELL_KNOWN_NAMES) {
700 /* We just extend the array here, but
701 * do not allocate the strings inside
702 * of it, instead we just point to our
703 * buffer directly. */
704 n = strv_length(m->creds.well_known_names);
705 wkn = realloc(m->creds.well_known_names, (n + 2) * sizeof(char*));
711 wkn[n] = d->name.name;
713 m->creds.well_known_names = wkn;
715 m->creds.mask |= SD_BUS_CREDS_WELL_KNOWN_NAMES;
719 case KDBUS_ITEM_CONN_DESCRIPTION:
720 m->creds.description = d->str;
721 m->creds.mask |= SD_BUS_CREDS_DESCRIPTION & bus->creds_mask;
724 case KDBUS_ITEM_AUXGROUPS:
726 if (bus->creds_mask & SD_BUS_CREDS_SUPPLEMENTARY_GIDS) {
727 assert_cc(sizeof(gid_t) == sizeof(uint32_t));
729 m->creds.n_supplementary_gids = (d->size - offsetof(struct kdbus_item, data32)) / sizeof(uint32_t);
730 m->creds.supplementary_gids = (gid_t*) d->data32;
731 m->creds.mask |= SD_BUS_CREDS_SUPPLEMENTARY_GIDS;
737 case KDBUS_ITEM_SECLABEL:
741 log_debug("Got unknown field from kernel %llu", d->type);
745 /* If we requested the list of well-known names to be appended
746 * and the sender had none no item for it will be
747 * attached. However, this does *not* mean that we the kernel
748 * didn't want to provide this information to us. Hence, let's
749 * explicitly mark this information as available if it was
751 m->creds.mask |= bus->creds_mask & SD_BUS_CREDS_WELL_KNOWN_NAMES;
753 r = bus_message_parse_fields(m);
757 /* Refuse messages if kdbus and dbus1 cookie doesn't match up */
758 if ((uint64_t) m->header->serial != k->cookie) {
763 /* Refuse messages where the reply flag doesn't match up */
764 if (!(m->header->flags & BUS_MESSAGE_NO_REPLY_EXPECTED) != !!(k->flags & KDBUS_MSG_EXPECT_REPLY)) {
769 /* Refuse reply messages where the reply cookie doesn't match up */
770 if ((m->header->flags & BUS_MESSAGE_NO_REPLY_EXPECTED) && m->reply_cookie != k->cookie_reply) {
775 /* Refuse messages where the autostart flag doesn't match up */
776 if (!(m->header->flags & BUS_MESSAGE_NO_AUTO_START) != !(k->flags & KDBUS_MSG_NO_AUTO_START)) {
781 /* Override information from the user header with data from the kernel */
782 if (k->src_id == KDBUS_SRC_ID_KERNEL)
783 bus_message_set_sender_driver(bus, m);
785 snprintf(m->sender_buffer, sizeof(m->sender_buffer), ":1.%llu", (unsigned long long) k->src_id);
786 m->sender = m->creds.unique_name = m->sender_buffer;
790 m->destination = destination;
791 else if (k->dst_id == KDBUS_DST_ID_BROADCAST)
792 m->destination = NULL;
793 else if (k->dst_id == KDBUS_DST_ID_NAME)
794 m->destination = bus->unique_name; /* fill in unique name if the well-known name is missing */
796 snprintf(m->destination_buffer, sizeof(m->destination_buffer), ":1.%llu", (unsigned long long) k->dst_id);
797 m->destination = m->destination_buffer;
800 /* We take possession of the kmsg struct now */
802 m->release_kdbus = true;
806 bus->rqueue[bus->rqueue_size++] = m;
812 sd_bus_message_unref(m);
817 int bus_kernel_take_fd(sd_bus *b) {
818 struct kdbus_cmd_free cmd_free = {
819 .size = sizeof(cmd_free),
822 struct kdbus_bloom_parameter *bloom = NULL;
823 struct kdbus_cmd_hello *hello;
824 struct kdbus_item_list *items;
825 struct kdbus_item *item;
826 _cleanup_free_ char *g = NULL;
828 size_t l = 0, m = 0, sz;
838 if (b->description) {
839 g = bus_label_escape(b->description);
847 /* If no name is explicitly set, we'll include a hint
848 * indicating the library implementation, a hint which
849 * kind of bus this is and the thread name */
851 assert_se(prctl(PR_GET_NAME, (unsigned long) pr) >= 0);
854 name = b->is_system ? "sd-system" :
855 b->is_user ? "sd-user" : "sd";
857 _cleanup_free_ char *e = NULL;
859 e = bus_label_escape(pr);
863 g = strappend(b->is_system ? "sd-system-" :
864 b->is_user ? "sd-user-" : "sd-",
872 b->description = bus_label_unescape(name);
879 sz = ALIGN8(offsetof(struct kdbus_cmd_hello, items)) +
880 ALIGN8(offsetof(struct kdbus_item, str) + m + 1);
882 if (b->fake_creds_valid)
883 sz += ALIGN8(offsetof(struct kdbus_item, creds) + sizeof(struct kdbus_creds));
885 if (b->fake_pids_valid)
886 sz += ALIGN8(offsetof(struct kdbus_item, pids) + sizeof(struct kdbus_pids));
889 l = strlen(b->fake_label);
890 sz += ALIGN8(offsetof(struct kdbus_item, str) + l + 1);
893 hello = alloca0_align(sz, 8);
895 hello->flags = b->hello_flags;
896 hello->attach_flags_send = _KDBUS_ATTACH_ANY;
897 hello->attach_flags_recv = b->attach_flags;
898 hello->pool_size = KDBUS_POOL_SIZE;
902 item->size = offsetof(struct kdbus_item, str) + m + 1;
903 item->type = KDBUS_ITEM_CONN_DESCRIPTION;
904 memcpy(item->str, name, m + 1);
905 item = KDBUS_ITEM_NEXT(item);
907 if (b->fake_creds_valid) {
908 item->size = offsetof(struct kdbus_item, creds) + sizeof(struct kdbus_creds);
909 item->type = KDBUS_ITEM_CREDS;
910 item->creds = b->fake_creds;
912 item = KDBUS_ITEM_NEXT(item);
915 if (b->fake_pids_valid) {
916 item->size = offsetof(struct kdbus_item, pids) + sizeof(struct kdbus_pids);
917 item->type = KDBUS_ITEM_PIDS;
918 item->pids = b->fake_pids;
920 item = KDBUS_ITEM_NEXT(item);
924 item->size = offsetof(struct kdbus_item, str) + l + 1;
925 item->type = KDBUS_ITEM_SECLABEL;
926 memcpy(item->str, b->fake_label, l+1);
929 r = ioctl(b->input_fd, KDBUS_CMD_HELLO, hello);
933 if (!b->kdbus_buffer) {
934 b->kdbus_buffer = mmap(NULL, KDBUS_POOL_SIZE, PROT_READ, MAP_SHARED, b->input_fd, 0);
935 if (b->kdbus_buffer == MAP_FAILED) {
936 b->kdbus_buffer = NULL;
942 /* The higher 32bit of the bus_flags fields are considered
943 * 'incompatible flags'. Refuse them all for now. */
944 if (hello->bus_flags > 0xFFFFFFFFULL) {
949 /* extract bloom parameters from items */
950 items = (void*)((uint8_t*)b->kdbus_buffer + hello->offset);
951 KDBUS_ITEM_FOREACH(item, items, items) {
952 switch (item->type) {
953 case KDBUS_ITEM_BLOOM_PARAMETER:
954 bloom = &item->bloom_parameter;
959 if (!bloom || !bloom_validate_parameters((size_t) bloom->size, (unsigned) bloom->n_hash)) {
964 b->bloom_size = (size_t) bloom->size;
965 b->bloom_n_hash = (unsigned) bloom->n_hash;
967 if (asprintf(&b->unique_name, ":1.%llu", (unsigned long long) hello->id) < 0) {
972 b->unique_id = hello->id;
975 b->bus_client = true;
976 b->can_fds = !!(hello->flags & KDBUS_HELLO_ACCEPT_FD);
977 b->message_version = 2;
978 b->message_endian = BUS_NATIVE_ENDIAN;
980 /* the kernel told us the UUID of the underlying bus */
981 memcpy(b->server_id.bytes, hello->id128, sizeof(b->server_id.bytes));
983 /* free returned items */
984 (void) bus_kernel_cmd_free(b, hello->offset);
986 return bus_start_running(b);
989 cmd_free.offset = hello->offset;
990 (void) ioctl(b->input_fd, KDBUS_CMD_FREE, &cmd_free);
994 int bus_kernel_connect(sd_bus *b) {
996 assert(b->input_fd < 0);
997 assert(b->output_fd < 0);
1003 b->input_fd = open(b->kernel, O_RDWR|O_NOCTTY|O_CLOEXEC);
1004 if (b->input_fd < 0)
1007 b->output_fd = b->input_fd;
1009 return bus_kernel_take_fd(b);
1012 int bus_kernel_cmd_free(sd_bus *bus, uint64_t offset) {
1013 struct kdbus_cmd_free cmd = {
1014 .size = sizeof(cmd),
1021 assert(bus->is_kernel);
1023 r = ioctl(bus->input_fd, KDBUS_CMD_FREE, &cmd);
1030 static void close_kdbus_msg(sd_bus *bus, struct kdbus_msg *k) {
1031 struct kdbus_item *d;
1036 KDBUS_ITEM_FOREACH(d, k, items) {
1037 if (d->type == KDBUS_ITEM_FDS)
1038 close_many(d->fds, (d->size - offsetof(struct kdbus_item, fds)) / sizeof(int));
1039 else if (d->type == KDBUS_ITEM_PAYLOAD_MEMFD)
1040 safe_close(d->memfd.fd);
1043 bus_kernel_cmd_free(bus, (uint8_t*) k - (uint8_t*) bus->kdbus_buffer);
1046 int bus_kernel_write_message(sd_bus *bus, sd_bus_message *m, bool hint_sync_call) {
1047 struct kdbus_cmd_send cmd = { };
1052 assert(bus->state == BUS_RUNNING);
1054 /* If we can't deliver, we want room for the error message */
1055 r = bus_rqueue_make_room(bus);
1059 r = bus_message_setup_kmsg(bus, m);
1063 cmd.size = sizeof(cmd);
1064 cmd.msg_address = (uintptr_t)m->kdbus;
1066 /* If this is a synchronous method call, then let's tell the
1067 * kernel, so that it can pass CPU time/scheduling to the
1068 * destination for the time, if it wants to. If we
1069 * synchronously wait for the result anyway, we won't need CPU
1071 if (hint_sync_call) {
1072 m->kdbus->flags |= KDBUS_MSG_EXPECT_REPLY;
1073 cmd.flags |= KDBUS_SEND_SYNC_REPLY;
1076 r = ioctl(bus->output_fd, KDBUS_CMD_SEND, &cmd);
1078 _cleanup_bus_error_free_ sd_bus_error error = SD_BUS_ERROR_NULL;
1079 sd_bus_message *reply;
1081 if (errno == EAGAIN || errno == EINTR)
1083 else if (errno == ENXIO || errno == ESRCH) {
1085 /* ENXIO: unique name not known
1086 * ESRCH: well-known name not known */
1088 if (m->header->type == SD_BUS_MESSAGE_METHOD_CALL)
1089 sd_bus_error_setf(&error, SD_BUS_ERROR_SERVICE_UNKNOWN, "Destination %s not known", m->destination);
1091 log_debug("Could not deliver message to %s as destination is not known. Ignoring.", m->destination);
1095 } else if (errno == EADDRNOTAVAIL) {
1097 /* EADDRNOTAVAIL: activation is possible, but turned off in request flags */
1099 if (m->header->type == SD_BUS_MESSAGE_METHOD_CALL)
1100 sd_bus_error_setf(&error, SD_BUS_ERROR_SERVICE_UNKNOWN, "Activation of %s not requested", m->destination);
1102 log_debug("Could not deliver message to %s as destination is not activated. Ignoring.", m->destination);
1108 r = bus_message_new_synthetic_error(
1110 BUS_MESSAGE_COOKIE(m),
1117 r = bus_seal_synthetic_message(bus, reply);
1121 bus->rqueue[bus->rqueue_size++] = reply;
1123 } else if (hint_sync_call) {
1124 struct kdbus_msg *k;
1126 k = (struct kdbus_msg *)((uint8_t *)bus->kdbus_buffer + cmd.reply.offset);
1129 if (k->payload_type == KDBUS_PAYLOAD_DBUS) {
1131 r = bus_kernel_make_message(bus, k);
1133 close_kdbus_msg(bus, k);
1135 /* Anybody can send us invalid messages, let's just drop them. */
1136 if (r == -EBADMSG || r == -EPROTOTYPE)
1137 log_debug_errno(r, "Ignoring invalid message: %m");
1142 log_debug("Ignoring message with unknown payload type %llu.", (unsigned long long) k->payload_type);
1143 close_kdbus_msg(bus, k);
1150 static int push_name_owner_changed(sd_bus *bus, const char *name, const char *old_owner, const char *new_owner) {
1151 _cleanup_bus_message_unref_ sd_bus_message *m = NULL;
1156 r = sd_bus_message_new_signal(
1159 "/org/freedesktop/DBus",
1160 "org.freedesktop.DBus",
1161 "NameOwnerChanged");
1165 r = sd_bus_message_append(m, "sss", name, old_owner, new_owner);
1169 bus_message_set_sender_driver(bus, m);
1171 r = bus_seal_synthetic_message(bus, m);
1175 bus->rqueue[bus->rqueue_size++] = m;
1181 static int translate_name_change(sd_bus *bus, struct kdbus_msg *k, struct kdbus_item *d) {
1182 char new_owner[UNIQUE_NAME_MAX], old_owner[UNIQUE_NAME_MAX];
1188 if (d->type == KDBUS_ITEM_NAME_ADD || (d->name_change.old_id.flags & (KDBUS_NAME_IN_QUEUE|KDBUS_NAME_ACTIVATOR)))
1191 sprintf(old_owner, ":1.%llu", (unsigned long long) d->name_change.old_id.id);
1193 if (d->type == KDBUS_ITEM_NAME_REMOVE || (d->name_change.new_id.flags & (KDBUS_NAME_IN_QUEUE|KDBUS_NAME_ACTIVATOR))) {
1195 if (isempty(old_owner))
1200 sprintf(new_owner, ":1.%llu", (unsigned long long) d->name_change.new_id.id);
1202 return push_name_owner_changed(bus, d->name_change.name, old_owner, new_owner);
1205 static int translate_id_change(sd_bus *bus, struct kdbus_msg *k, struct kdbus_item *d) {
1206 char owner[UNIQUE_NAME_MAX];
1212 sprintf(owner, ":1.%llu", d->id_change.id);
1214 return push_name_owner_changed(
1216 d->type == KDBUS_ITEM_ID_ADD ? NULL : owner,
1217 d->type == KDBUS_ITEM_ID_ADD ? owner : NULL);
1220 static int translate_reply(sd_bus *bus, struct kdbus_msg *k, struct kdbus_item *d) {
1221 _cleanup_bus_message_unref_ sd_bus_message *m = NULL;
1228 r = bus_message_new_synthetic_error(
1231 d->type == KDBUS_ITEM_REPLY_TIMEOUT ?
1232 &SD_BUS_ERROR_MAKE_CONST(SD_BUS_ERROR_NO_REPLY, "Method call timed out") :
1233 &SD_BUS_ERROR_MAKE_CONST(SD_BUS_ERROR_NO_REPLY, "Method call peer died"),
1238 bus_message_set_sender_driver(bus, m);
1240 r = bus_seal_synthetic_message(bus, m);
1244 bus->rqueue[bus->rqueue_size++] = m;
1250 static int bus_kernel_translate_message(sd_bus *bus, struct kdbus_msg *k) {
1251 struct kdbus_item *d, *found = NULL;
1253 static int (* const translate[])(sd_bus *bus, struct kdbus_msg *k, struct kdbus_item *d) = {
1254 [KDBUS_ITEM_NAME_ADD - _KDBUS_ITEM_KERNEL_BASE] = translate_name_change,
1255 [KDBUS_ITEM_NAME_REMOVE - _KDBUS_ITEM_KERNEL_BASE] = translate_name_change,
1256 [KDBUS_ITEM_NAME_CHANGE - _KDBUS_ITEM_KERNEL_BASE] = translate_name_change,
1258 [KDBUS_ITEM_ID_ADD - _KDBUS_ITEM_KERNEL_BASE] = translate_id_change,
1259 [KDBUS_ITEM_ID_REMOVE - _KDBUS_ITEM_KERNEL_BASE] = translate_id_change,
1261 [KDBUS_ITEM_REPLY_TIMEOUT - _KDBUS_ITEM_KERNEL_BASE] = translate_reply,
1262 [KDBUS_ITEM_REPLY_DEAD - _KDBUS_ITEM_KERNEL_BASE] = translate_reply,
1267 assert(k->payload_type == KDBUS_PAYLOAD_KERNEL);
1269 KDBUS_ITEM_FOREACH(d, k, items) {
1270 if (d->type == KDBUS_ITEM_TIMESTAMP)
1273 if (d->type >= _KDBUS_ITEM_KERNEL_BASE && d->type < _KDBUS_ITEM_KERNEL_BASE + ELEMENTSOF(translate)) {
1278 log_debug("Got unknown field from kernel %llu", d->type);
1282 log_debug("Didn't find a kernel message to translate.");
1286 return translate[found->type - _KDBUS_ITEM_KERNEL_BASE](bus, k, found);
1289 int bus_kernel_read_message(sd_bus *bus, bool hint_priority, int64_t priority) {
1290 struct kdbus_cmd_recv recv = { .size = sizeof(recv) };
1291 struct kdbus_msg *k;
1296 r = bus_rqueue_make_room(bus);
1300 if (hint_priority) {
1301 recv.flags |= KDBUS_RECV_USE_PRIORITY;
1302 recv.priority = priority;
1305 r = ioctl(bus->input_fd, KDBUS_CMD_RECV, &recv);
1307 if (errno == EAGAIN)
1310 if (errno == EOVERFLOW) {
1311 log_debug("%s: kdbus reports %" PRIu64 " dropped broadcast messages, ignoring.", strna(bus->description), (uint64_t) recv.dropped_msgs);
1318 k = (struct kdbus_msg *)((uint8_t *)bus->kdbus_buffer + recv.reply.offset);
1319 if (k->payload_type == KDBUS_PAYLOAD_DBUS) {
1320 r = bus_kernel_make_message(bus, k);
1322 /* Anybody can send us invalid messages, let's just drop them. */
1323 if (r == -EBADMSG || r == -EPROTOTYPE) {
1324 log_debug_errno(r, "Ignoring invalid message: %m");
1328 } else if (k->payload_type == KDBUS_PAYLOAD_KERNEL)
1329 r = bus_kernel_translate_message(bus, k);
1331 log_debug("Ignoring message with unknown payload type %llu.", (unsigned long long) k->payload_type);
1336 close_kdbus_msg(bus, k);
1338 return r < 0 ? r : 1;
1341 int bus_kernel_pop_memfd(sd_bus *bus, void **address, size_t *mapped, size_t *allocated) {
1342 struct memfd_cache *c;
1349 if (!bus || !bus->is_kernel)
1352 assert_se(pthread_mutex_lock(&bus->memfd_cache_mutex) >= 0);
1354 if (bus->n_memfd_cache <= 0) {
1357 assert_se(pthread_mutex_unlock(&bus->memfd_cache_mutex) >= 0);
1359 r = memfd_new(bus->description);
1369 c = &bus->memfd_cache[--bus->n_memfd_cache];
1372 assert(c->mapped == 0 || c->address);
1374 *address = c->address;
1375 *mapped = c->mapped;
1376 *allocated = c->allocated;
1379 assert_se(pthread_mutex_unlock(&bus->memfd_cache_mutex) >= 0);
1384 static void close_and_munmap(int fd, void *address, size_t size) {
1386 assert_se(munmap(address, PAGE_ALIGN(size)) >= 0);
1391 void bus_kernel_push_memfd(sd_bus *bus, int fd, void *address, size_t mapped, size_t allocated) {
1392 struct memfd_cache *c;
1393 uint64_t max_mapped = PAGE_ALIGN(MEMFD_CACHE_ITEM_SIZE_MAX);
1396 assert(mapped == 0 || address);
1398 if (!bus || !bus->is_kernel) {
1399 close_and_munmap(fd, address, mapped);
1403 assert_se(pthread_mutex_lock(&bus->memfd_cache_mutex) >= 0);
1405 if (bus->n_memfd_cache >= ELEMENTSOF(bus->memfd_cache)) {
1406 assert_se(pthread_mutex_unlock(&bus->memfd_cache_mutex) >= 0);
1408 close_and_munmap(fd, address, mapped);
1412 c = &bus->memfd_cache[bus->n_memfd_cache++];
1414 c->address = address;
1416 /* If overly long, let's return a bit to the OS */
1417 if (mapped > max_mapped) {
1418 assert_se(memfd_set_size(fd, max_mapped) >= 0);
1419 assert_se(munmap((uint8_t*) address + max_mapped, PAGE_ALIGN(mapped - max_mapped)) >= 0);
1420 c->mapped = c->allocated = max_mapped;
1423 c->allocated = allocated;
1426 assert_se(pthread_mutex_unlock(&bus->memfd_cache_mutex) >= 0);
1429 void bus_kernel_flush_memfd(sd_bus *b) {
1434 for (i = 0; i < b->n_memfd_cache; i++)
1435 close_and_munmap(b->memfd_cache[i].fd, b->memfd_cache[i].address, b->memfd_cache[i].mapped);
1438 uint64_t request_name_flags_to_kdbus(uint64_t flags) {
1441 if (flags & SD_BUS_NAME_ALLOW_REPLACEMENT)
1442 f |= KDBUS_NAME_ALLOW_REPLACEMENT;
1444 if (flags & SD_BUS_NAME_REPLACE_EXISTING)
1445 f |= KDBUS_NAME_REPLACE_EXISTING;
1447 if (flags & SD_BUS_NAME_QUEUE)
1448 f |= KDBUS_NAME_QUEUE;
1453 uint64_t attach_flags_to_kdbus(uint64_t mask) {
1456 if (mask & (SD_BUS_CREDS_UID|SD_BUS_CREDS_EUID|SD_BUS_CREDS_SUID|SD_BUS_CREDS_FSUID|
1457 SD_BUS_CREDS_GID|SD_BUS_CREDS_EGID|SD_BUS_CREDS_SGID|SD_BUS_CREDS_FSGID))
1458 m |= KDBUS_ATTACH_CREDS;
1460 if (mask & (SD_BUS_CREDS_PID|SD_BUS_CREDS_TID))
1461 m |= KDBUS_ATTACH_PIDS;
1463 if (mask & SD_BUS_CREDS_COMM)
1464 m |= KDBUS_ATTACH_PID_COMM;
1466 if (mask & SD_BUS_CREDS_TID_COMM)
1467 m |= KDBUS_ATTACH_TID_COMM;
1469 if (mask & SD_BUS_CREDS_EXE)
1470 m |= KDBUS_ATTACH_EXE;
1472 if (mask & SD_BUS_CREDS_CMDLINE)
1473 m |= KDBUS_ATTACH_CMDLINE;
1475 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))
1476 m |= KDBUS_ATTACH_CGROUP;
1478 if (mask & (SD_BUS_CREDS_EFFECTIVE_CAPS|SD_BUS_CREDS_PERMITTED_CAPS|SD_BUS_CREDS_INHERITABLE_CAPS|SD_BUS_CREDS_BOUNDING_CAPS))
1479 m |= KDBUS_ATTACH_CAPS;
1481 if (mask & SD_BUS_CREDS_SELINUX_CONTEXT)
1482 m |= KDBUS_ATTACH_SECLABEL;
1484 if (mask & (SD_BUS_CREDS_AUDIT_SESSION_ID|SD_BUS_CREDS_AUDIT_LOGIN_UID))
1485 m |= KDBUS_ATTACH_AUDIT;
1487 if (mask & SD_BUS_CREDS_WELL_KNOWN_NAMES)
1488 m |= KDBUS_ATTACH_NAMES;
1490 if (mask & SD_BUS_CREDS_DESCRIPTION)
1491 m |= KDBUS_ATTACH_CONN_DESCRIPTION;
1493 if (mask & SD_BUS_CREDS_SUPPLEMENTARY_GIDS)
1494 m |= KDBUS_ATTACH_AUXGROUPS;
1499 int bus_kernel_create_bus(const char *name, bool world, char **s) {
1500 struct kdbus_cmd_make *make;
1501 struct kdbus_item *n;
1508 fd = open("/sys/fs/kdbus/control", O_RDWR|O_NOCTTY|O_CLOEXEC);
1513 make = alloca0_align(offsetof(struct kdbus_cmd_make, items) +
1514 ALIGN8(offsetof(struct kdbus_item, bloom_parameter) + sizeof(struct kdbus_bloom_parameter)) +
1515 ALIGN8(offsetof(struct kdbus_item, data64) + sizeof(uint64_t)) +
1516 ALIGN8(offsetof(struct kdbus_item, data64) + sizeof(uint64_t)) +
1517 ALIGN8(offsetof(struct kdbus_item, str) + DECIMAL_STR_MAX(uid_t) + 1 + l + 1),
1520 make->size = offsetof(struct kdbus_cmd_make, items);
1522 /* Set the bloom parameters */
1524 n->size = offsetof(struct kdbus_item, bloom_parameter) +
1525 sizeof(struct kdbus_bloom_parameter);
1526 n->type = KDBUS_ITEM_BLOOM_PARAMETER;
1527 n->bloom_parameter.size = DEFAULT_BLOOM_SIZE;
1528 n->bloom_parameter.n_hash = DEFAULT_BLOOM_N_HASH;
1530 assert_cc(DEFAULT_BLOOM_SIZE > 0);
1531 assert_cc(DEFAULT_BLOOM_N_HASH > 0);
1533 make->size += ALIGN8(n->size);
1535 /* The busses we create make no restrictions on what metadata
1536 * peers can read from incoming messages. */
1537 n = KDBUS_ITEM_NEXT(n);
1538 n->type = KDBUS_ITEM_ATTACH_FLAGS_RECV;
1539 n->size = offsetof(struct kdbus_item, data64) + sizeof(uint64_t);
1540 n->data64[0] = _KDBUS_ATTACH_ANY;
1541 make->size += ALIGN8(n->size);
1543 /* Provide all metadata via bus-owner queries */
1544 n = KDBUS_ITEM_NEXT(n);
1545 n->type = KDBUS_ITEM_ATTACH_FLAGS_SEND;
1546 n->size = offsetof(struct kdbus_item, data64) + sizeof(uint64_t);
1547 n->data64[0] = _KDBUS_ATTACH_ANY;
1548 make->size += ALIGN8(n->size);
1550 /* Set the a good name */
1551 n = KDBUS_ITEM_NEXT(n);
1552 sprintf(n->str, UID_FMT "-%s", getuid(), name);
1553 n->size = offsetof(struct kdbus_item, str) + strlen(n->str) + 1;
1554 n->type = KDBUS_ITEM_MAKE_NAME;
1555 make->size += ALIGN8(n->size);
1557 make->flags = world ? KDBUS_MAKE_ACCESS_WORLD : 0;
1559 if (ioctl(fd, KDBUS_CMD_BUS_MAKE, make) < 0) {
1567 p = strjoin("/sys/fs/kdbus/", n->str, "/bus", NULL);
1579 int bus_kernel_open_bus_fd(const char *bus, char **path) {
1586 len = strlen("/sys/fs/kdbus/") + DECIMAL_STR_MAX(uid_t) + 1 + strlen(bus) + strlen("/bus") + 1;
1593 p = newa(char, len);
1595 sprintf(p, "/sys/fs/kdbus/" UID_FMT "-%s/bus", getuid(), bus);
1597 fd = open(p, O_RDWR|O_NOCTTY|O_CLOEXEC);
1611 int bus_kernel_create_endpoint(const char *bus_name, const char *ep_name, char **ep_path) {
1612 _cleanup_free_ char *path = NULL;
1613 struct kdbus_cmd_make *make;
1614 struct kdbus_item *n;
1618 fd = bus_kernel_open_bus_fd(bus_name, &path);
1622 make = alloca0_align(ALIGN8(offsetof(struct kdbus_cmd_make, items)) +
1623 ALIGN8(offsetof(struct kdbus_item, str) + DECIMAL_STR_MAX(uid_t) + 1 + strlen(ep_name) + 1),
1625 make->size = ALIGN8(offsetof(struct kdbus_cmd_make, items));
1626 make->flags = KDBUS_MAKE_ACCESS_WORLD;
1629 sprintf(n->str, UID_FMT "-%s", getuid(), ep_name);
1630 n->size = offsetof(struct kdbus_item, str) + strlen(n->str) + 1;
1631 n->type = KDBUS_ITEM_MAKE_NAME;
1632 make->size += ALIGN8(n->size);
1635 if (ioctl(fd, KDBUS_CMD_ENDPOINT_MAKE, make) < 0) {
1643 p = strjoin(dirname(path), "/", name, NULL);
1655 int bus_kernel_try_close(sd_bus *bus) {
1657 assert(bus->is_kernel);
1659 if (ioctl(bus->input_fd, KDBUS_CMD_BYEBYE) < 0)
1665 int bus_kernel_drop_one(int fd) {
1666 struct kdbus_cmd_recv recv = {
1667 .size = sizeof(recv),
1668 .flags = KDBUS_RECV_DROP,
1673 if (ioctl(fd, KDBUS_CMD_RECV, &recv) < 0)
1679 int bus_kernel_realize_attach_flags(sd_bus *bus) {
1680 struct kdbus_cmd_update *update;
1681 struct kdbus_item *n;
1684 assert(bus->is_kernel);
1686 update = alloca0_align(offsetof(struct kdbus_cmd_update, items) +
1687 ALIGN8(offsetof(struct kdbus_item, data64) + sizeof(uint64_t)),
1691 n->type = KDBUS_ITEM_ATTACH_FLAGS_RECV;
1692 n->size = offsetof(struct kdbus_item, data64) + sizeof(uint64_t);
1693 n->data64[0] = bus->attach_flags;
1696 offsetof(struct kdbus_cmd_update, items) +
1699 if (ioctl(bus->input_fd, KDBUS_CMD_CONN_UPDATE, update) < 0)
1705 int bus_kernel_fix_attach_mask(void) {
1706 _cleanup_free_ char *mask = NULL;
1707 uint64_t m = (uint64_t) -1;
1711 /* By default we don't want any kdbus metadata fields to be
1712 * suppressed, hence we reset the kernel mask for it to
1713 * (uint64_t) -1. This is overridable via a kernel command
1714 * line option, however. */
1716 r = get_proc_cmdline_key("systemd.kdbus_attach_flags_mask=", &mask);
1718 return log_warning_errno(r, "Failed to read kernel command line: %m");
1721 const char *p = mask;
1723 if (startswith(p, "0x"))
1726 if (sscanf(p, "%" PRIx64, &m) != 1)
1727 log_warning("Couldn't parse systemd.kdbus_attach_flags_mask= kernel command line parameter.");
1730 sprintf(buf, "0x%" PRIx64 "\n", m);
1731 r = write_string_file("/sys/module/kdbus/parameters/attach_flags_mask", buf);
1733 return log_full_errno(
1734 IN_SET(r, -ENOENT, -EROFS) ? LOG_DEBUG : LOG_WARNING, r,
1735 "Failed to write kdbus attach mask: %m");
1740 int bus_kernel_get_bus_name(sd_bus *bus, char **name) {
1741 struct kdbus_cmd_info cmd = {
1742 .size = sizeof(struct kdbus_cmd_info),
1744 struct kdbus_info *info;
1745 struct kdbus_item *item;
1751 assert(bus->is_kernel);
1753 r = ioctl(bus->input_fd, KDBUS_CMD_BUS_CREATOR_INFO, &cmd);
1757 info = (struct kdbus_info*) ((uint8_t*) bus->kdbus_buffer + cmd.offset);
1759 KDBUS_ITEM_FOREACH(item, info, items)
1760 if (item->type == KDBUS_ITEM_MAKE_NAME) {
1761 r = free_and_strdup(&n, item->str);
1765 bus_kernel_cmd_free(bus, cmd.offset);