| /*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/ |
| |
| /*** |
| This file is part of systemd. |
| |
| Copyright 2013 Lennart Poettering |
| |
| systemd is free software; you can redistribute it and/or modify it |
| under the terms of the GNU Lesser General Public License as published by |
| the Free Software Foundation; either version 2.1 of the License, or |
| (at your option) any later version. |
| |
| systemd is distributed in the hope that it will be useful, but |
| WITHOUT ANY WARRANTY; without even the implied warranty of |
| MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
| Lesser General Public License for more details. |
| |
| You should have received a copy of the GNU Lesser General Public License |
| along with systemd; If not, see <http://www.gnu.org/licenses/>. |
| ***/ |
| |
| #ifdef HAVE_VALGRIND_MEMCHECK_H |
| #include <valgrind/memcheck.h> |
| #endif |
| |
| #include <fcntl.h> |
| #include <malloc.h> |
| #include <sys/mman.h> |
| #include <sys/prctl.h> |
| |
| /* When we include libgen.h because we need dirname() we immediately |
| * undefine basename() since libgen.h defines it as a macro to the XDG |
| * version which is really broken. */ |
| #include <libgen.h> |
| #undef basename |
| |
| #include "util.h" |
| #include "strv.h" |
| #include "memfd-util.h" |
| #include "capability.h" |
| #include "fileio.h" |
| #include "formats-util.h" |
| |
| #include "bus-internal.h" |
| #include "bus-message.h" |
| #include "bus-kernel.h" |
| #include "bus-bloom.h" |
| #include "bus-util.h" |
| #include "bus-label.h" |
| |
| #define UNIQUE_NAME_MAX (3+DECIMAL_STR_MAX(uint64_t)) |
| |
| int bus_kernel_parse_unique_name(const char *s, uint64_t *id) { |
| int r; |
| |
| assert(s); |
| assert(id); |
| |
| if (!startswith(s, ":1.")) |
| return 0; |
| |
| r = safe_atou64(s + 3, id); |
| if (r < 0) |
| return r; |
| |
| return 1; |
| } |
| |
| static void append_payload_vec(struct kdbus_item **d, const void *p, size_t sz) { |
| assert(d); |
| assert(sz > 0); |
| |
| *d = ALIGN8_PTR(*d); |
| |
| /* Note that p can be NULL, which encodes a region full of |
| * zeroes, which is useful to optimize certain padding |
| * conditions */ |
| |
| (*d)->size = offsetof(struct kdbus_item, vec) + sizeof(struct kdbus_vec); |
| (*d)->type = KDBUS_ITEM_PAYLOAD_VEC; |
| (*d)->vec.address = PTR_TO_UINT64(p); |
| (*d)->vec.size = sz; |
| |
| *d = (struct kdbus_item *) ((uint8_t*) *d + (*d)->size); |
| } |
| |
| static void append_payload_memfd(struct kdbus_item **d, int memfd, size_t start, size_t sz) { |
| assert(d); |
| assert(memfd >= 0); |
| assert(sz > 0); |
| |
| *d = ALIGN8_PTR(*d); |
| (*d)->size = offsetof(struct kdbus_item, memfd) + sizeof(struct kdbus_memfd); |
| (*d)->type = KDBUS_ITEM_PAYLOAD_MEMFD; |
| (*d)->memfd.fd = memfd; |
| (*d)->memfd.start = start; |
| (*d)->memfd.size = sz; |
| |
| *d = (struct kdbus_item *) ((uint8_t*) *d + (*d)->size); |
| } |
| |
| static void append_destination(struct kdbus_item **d, const char *s, size_t length) { |
| assert(d); |
| assert(s); |
| |
| *d = ALIGN8_PTR(*d); |
| |
| (*d)->size = offsetof(struct kdbus_item, str) + length + 1; |
| (*d)->type = KDBUS_ITEM_DST_NAME; |
| memcpy((*d)->str, s, length + 1); |
| |
| *d = (struct kdbus_item *) ((uint8_t*) *d + (*d)->size); |
| } |
| |
| static struct kdbus_bloom_filter *append_bloom(struct kdbus_item **d, size_t length) { |
| struct kdbus_item *i; |
| |
| assert(d); |
| |
| i = ALIGN8_PTR(*d); |
| |
| i->size = offsetof(struct kdbus_item, bloom_filter) + |
| offsetof(struct kdbus_bloom_filter, data) + |
| length; |
| i->type = KDBUS_ITEM_BLOOM_FILTER; |
| |
| *d = (struct kdbus_item *) ((uint8_t*) i + i->size); |
| |
| return &i->bloom_filter; |
| } |
| |
| static void append_fds(struct kdbus_item **d, const int fds[], unsigned n_fds) { |
| assert(d); |
| assert(fds); |
| assert(n_fds > 0); |
| |
| *d = ALIGN8_PTR(*d); |
| (*d)->size = offsetof(struct kdbus_item, fds) + sizeof(int) * n_fds; |
| (*d)->type = KDBUS_ITEM_FDS; |
| memcpy((*d)->fds, fds, sizeof(int) * n_fds); |
| |
| *d = (struct kdbus_item *) ((uint8_t*) *d + (*d)->size); |
| } |
| |
| static void add_bloom_arg(void *data, size_t size, unsigned n_hash, unsigned i, const char *t) { |
| char buf[sizeof("arg")-1 + 2 + sizeof("-slash-prefix")]; |
| char *e; |
| |
| assert(data); |
| assert(size > 0); |
| assert(i < 64); |
| assert(t); |
| |
| e = stpcpy(buf, "arg"); |
| if (i < 10) |
| *(e++) = '0' + (char) i; |
| else { |
| *(e++) = '0' + (char) (i / 10); |
| *(e++) = '0' + (char) (i % 10); |
| } |
| |
| *e = 0; |
| bloom_add_pair(data, size, n_hash, buf, t); |
| |
| strcpy(e, "-dot-prefix"); |
| bloom_add_prefixes(data, size, n_hash, buf, t, '.'); |
| strcpy(e, "-slash-prefix"); |
| bloom_add_prefixes(data, size, n_hash, buf, t, '/'); |
| } |
| |
| static int bus_message_setup_bloom(sd_bus_message *m, struct kdbus_bloom_filter *bloom) { |
| void *data; |
| unsigned i; |
| int r; |
| |
| assert(m); |
| assert(bloom); |
| |
| data = bloom->data; |
| memzero(data, m->bus->bloom_size); |
| bloom->generation = 0; |
| |
| bloom_add_pair(data, m->bus->bloom_size, m->bus->bloom_n_hash, "message-type", bus_message_type_to_string(m->header->type)); |
| |
| if (m->interface) |
| bloom_add_pair(data, m->bus->bloom_size, m->bus->bloom_n_hash, "interface", m->interface); |
| if (m->member) |
| bloom_add_pair(data, m->bus->bloom_size, m->bus->bloom_n_hash, "member", m->member); |
| if (m->path) { |
| bloom_add_pair(data, m->bus->bloom_size, m->bus->bloom_n_hash, "path", m->path); |
| bloom_add_pair(data, m->bus->bloom_size, m->bus->bloom_n_hash, "path-slash-prefix", m->path); |
| bloom_add_prefixes(data, m->bus->bloom_size, m->bus->bloom_n_hash, "path-slash-prefix", m->path, '/'); |
| } |
| |
| r = sd_bus_message_rewind(m, true); |
| if (r < 0) |
| return r; |
| |
| for (i = 0; i < 64; i++) { |
| const char *t, *contents; |
| char type; |
| |
| r = sd_bus_message_peek_type(m, &type, &contents); |
| if (r < 0) |
| return r; |
| |
| if (IN_SET(type, SD_BUS_TYPE_STRING, SD_BUS_TYPE_OBJECT_PATH, SD_BUS_TYPE_SIGNATURE)) { |
| |
| /* The bloom filter includes simple strings of any kind */ |
| r = sd_bus_message_read_basic(m, type, &t); |
| if (r < 0) |
| return r; |
| |
| add_bloom_arg(data, m->bus->bloom_size, m->bus->bloom_n_hash, i, t); |
| } if (type == SD_BUS_TYPE_ARRAY && STR_IN_SET(contents, "s", "o", "g")) { |
| |
| /* As well as array of simple strings of any kinds */ |
| r = sd_bus_message_enter_container(m, type, contents); |
| if (r < 0) |
| return r; |
| |
| while ((r = sd_bus_message_read_basic(m, contents[0], &t)) > 0) |
| add_bloom_arg(data, m->bus->bloom_size, m->bus->bloom_n_hash, i, t); |
| if (r < 0) |
| return r; |
| |
| r = sd_bus_message_exit_container(m); |
| if (r < 0) |
| return r; |
| |
| } else |
| /* Stop adding to bloom filter as soon as we |
| * run into the first argument we cannot add |
| * to it. */ |
| break; |
| } |
| |
| return 0; |
| } |
| |
| static int bus_message_setup_kmsg(sd_bus *b, sd_bus_message *m) { |
| struct bus_body_part *part; |
| struct kdbus_item *d; |
| const char *destination; |
| bool well_known; |
| uint64_t unique; |
| size_t sz, dl; |
| unsigned i; |
| int r; |
| |
| assert(b); |
| assert(m); |
| assert(m->sealed); |
| |
| /* We put this together only once, if this message is reused |
| * we reuse the earlier-built version */ |
| if (m->kdbus) |
| return 0; |
| |
| destination = m->destination ?: m->destination_ptr; |
| |
| if (destination) { |
| r = bus_kernel_parse_unique_name(destination, &unique); |
| if (r < 0) |
| return r; |
| |
| well_known = r == 0; |
| } else |
| well_known = false; |
| |
| sz = offsetof(struct kdbus_msg, items); |
| |
| /* Add in fixed header, fields header and payload */ |
| sz += (1 + m->n_body_parts) * ALIGN8(offsetof(struct kdbus_item, vec) + |
| MAX(sizeof(struct kdbus_vec), |
| sizeof(struct kdbus_memfd))); |
| |
| /* Add space for bloom filter */ |
| sz += ALIGN8(offsetof(struct kdbus_item, bloom_filter) + |
| offsetof(struct kdbus_bloom_filter, data) + |
| m->bus->bloom_size); |
| |
| /* Add in well-known destination header */ |
| if (well_known) { |
| dl = strlen(destination); |
| sz += ALIGN8(offsetof(struct kdbus_item, str) + dl + 1); |
| } |
| |
| /* Add space for unix fds */ |
| if (m->n_fds > 0) |
| sz += ALIGN8(offsetof(struct kdbus_item, fds) + sizeof(int)*m->n_fds); |
| |
| m->kdbus = memalign(8, sz); |
| if (!m->kdbus) { |
| r = -ENOMEM; |
| goto fail; |
| } |
| |
| m->free_kdbus = true; |
| memzero(m->kdbus, sz); |
| |
| m->kdbus->flags = |
| ((m->header->flags & BUS_MESSAGE_NO_REPLY_EXPECTED) ? 0 : KDBUS_MSG_EXPECT_REPLY) | |
| ((m->header->flags & BUS_MESSAGE_NO_AUTO_START) ? KDBUS_MSG_NO_AUTO_START : 0) | |
| ((m->header->type == SD_BUS_MESSAGE_SIGNAL) ? KDBUS_MSG_SIGNAL : 0); |
| |
| if (well_known) |
| /* verify_destination_id will usually be 0, which makes the kernel driver only look |
| * at the provided well-known name. Otherwise, the kernel will make sure the provided |
| * destination id matches the owner of the provided weel-known-name, and fail if they |
| * differ. Currently, this is only needed for bus-proxyd. */ |
| m->kdbus->dst_id = m->verify_destination_id; |
| else |
| m->kdbus->dst_id = destination ? unique : KDBUS_DST_ID_BROADCAST; |
| |
| m->kdbus->payload_type = KDBUS_PAYLOAD_DBUS; |
| m->kdbus->cookie = m->header->dbus2.cookie; |
| m->kdbus->priority = m->priority; |
| |
| if (m->header->flags & BUS_MESSAGE_NO_REPLY_EXPECTED) |
| m->kdbus->cookie_reply = m->reply_cookie; |
| else { |
| struct timespec now; |
| |
| assert_se(clock_gettime(CLOCK_MONOTONIC_COARSE, &now) == 0); |
| m->kdbus->timeout_ns = now.tv_sec * NSEC_PER_SEC + now.tv_nsec + |
| m->timeout * NSEC_PER_USEC; |
| } |
| |
| d = m->kdbus->items; |
| |
| if (well_known) |
| append_destination(&d, destination, dl); |
| |
| append_payload_vec(&d, m->header, BUS_MESSAGE_BODY_BEGIN(m)); |
| |
| MESSAGE_FOREACH_PART(part, i, m) { |
| if (part->is_zero) { |
| /* If this is padding then simply send a |
| * vector with a NULL data pointer which the |
| * kernel will just pass through. This is the |
| * most efficient way to encode zeroes */ |
| |
| append_payload_vec(&d, NULL, part->size); |
| continue; |
| } |
| |
| if (part->memfd >= 0 && part->sealed && destination) { |
| /* Try to send a memfd, if the part is |
| * sealed and this is not a broadcast. Since we can only */ |
| |
| append_payload_memfd(&d, part->memfd, part->memfd_offset, part->size); |
| continue; |
| } |
| |
| /* Otherwise, let's send a vector to the actual data. |
| * For that, we need to map it first. */ |
| r = bus_body_part_map(part); |
| if (r < 0) |
| goto fail; |
| |
| append_payload_vec(&d, part->data, part->size); |
| } |
| |
| if (m->header->type == SD_BUS_MESSAGE_SIGNAL) { |
| struct kdbus_bloom_filter *bloom; |
| |
| bloom = append_bloom(&d, m->bus->bloom_size); |
| r = bus_message_setup_bloom(m, bloom); |
| if (r < 0) |
| goto fail; |
| } |
| |
| if (m->n_fds > 0) |
| append_fds(&d, m->fds, m->n_fds); |
| |
| m->kdbus->size = (uint8_t*) d - (uint8_t*) m->kdbus; |
| assert(m->kdbus->size <= sz); |
| |
| return 0; |
| |
| fail: |
| m->poisoned = true; |
| return r; |
| } |
| |
| static void unset_memfds(struct sd_bus_message *m) { |
| struct bus_body_part *part; |
| unsigned i; |
| |
| assert(m); |
| |
| /* Make sure the memfds are not freed twice */ |
| MESSAGE_FOREACH_PART(part, i, m) |
| if (part->memfd >= 0) |
| part->memfd = -1; |
| } |
| |
| static void message_set_timestamp(sd_bus *bus, sd_bus_message *m, const struct kdbus_timestamp *ts) { |
| assert(bus); |
| assert(m); |
| |
| if (!ts) |
| return; |
| |
| if (!(bus->attach_flags & KDBUS_ATTACH_TIMESTAMP)) |
| return; |
| |
| m->realtime = ts->realtime_ns / NSEC_PER_USEC; |
| m->monotonic = ts->monotonic_ns / NSEC_PER_USEC; |
| m->seqnum = ts->seqnum; |
| } |
| |
| static int bus_kernel_make_message(sd_bus *bus, struct kdbus_msg *k) { |
| sd_bus_message *m = NULL; |
| struct kdbus_item *d; |
| unsigned n_fds = 0; |
| _cleanup_free_ int *fds = NULL; |
| struct bus_header *header = NULL; |
| void *footer = NULL; |
| size_t header_size = 0, footer_size = 0; |
| size_t n_bytes = 0, idx = 0; |
| const char *destination = NULL, *seclabel = NULL; |
| bool last_was_memfd = false; |
| int r; |
| |
| assert(bus); |
| assert(k); |
| assert(k->payload_type == KDBUS_PAYLOAD_DBUS); |
| |
| KDBUS_ITEM_FOREACH(d, k, items) { |
| size_t l; |
| |
| l = d->size - offsetof(struct kdbus_item, data); |
| |
| switch (d->type) { |
| |
| case KDBUS_ITEM_PAYLOAD_OFF: |
| if (!header) { |
| header = (struct bus_header*)((uint8_t*) k + d->vec.offset); |
| header_size = d->vec.size; |
| } |
| |
| footer = (uint8_t*) k + d->vec.offset; |
| footer_size = d->vec.size; |
| |
| n_bytes += d->vec.size; |
| last_was_memfd = false; |
| break; |
| |
| case KDBUS_ITEM_PAYLOAD_MEMFD: |
| if (!header) /* memfd cannot be first part */ |
| return -EBADMSG; |
| |
| n_bytes += d->memfd.size; |
| last_was_memfd = true; |
| break; |
| |
| case KDBUS_ITEM_FDS: { |
| int *f; |
| unsigned j; |
| |
| j = l / sizeof(int); |
| f = realloc(fds, sizeof(int) * (n_fds + j)); |
| if (!f) |
| return -ENOMEM; |
| |
| fds = f; |
| memcpy(fds + n_fds, d->fds, sizeof(int) * j); |
| n_fds += j; |
| break; |
| } |
| |
| case KDBUS_ITEM_SECLABEL: |
| seclabel = d->str; |
| break; |
| } |
| } |
| |
| if (last_was_memfd) /* memfd cannot be last part */ |
| return -EBADMSG; |
| |
| if (!header) |
| return -EBADMSG; |
| |
| if (header_size < sizeof(struct bus_header)) |
| return -EBADMSG; |
| |
| /* on kdbus we only speak native endian gvariant, never dbus1 |
| * marshalling or reverse endian */ |
| if (header->version != 2 || |
| header->endian != BUS_NATIVE_ENDIAN) |
| return -EPROTOTYPE; |
| |
| r = bus_message_from_header( |
| bus, |
| header, header_size, |
| footer, footer_size, |
| n_bytes, |
| fds, n_fds, |
| NULL, |
| seclabel, 0, &m); |
| if (r < 0) |
| return r; |
| |
| /* The well-known names list is different from the other |
| credentials. If we asked for it, but nothing is there, this |
| means that the list of well-known names is simply empty, not |
| that we lack any data */ |
| |
| m->creds.mask |= (SD_BUS_CREDS_UNIQUE_NAME|SD_BUS_CREDS_WELL_KNOWN_NAMES) & bus->creds_mask; |
| |
| KDBUS_ITEM_FOREACH(d, k, items) { |
| size_t l; |
| |
| l = d->size - offsetof(struct kdbus_item, data); |
| |
| switch (d->type) { |
| |
| case KDBUS_ITEM_PAYLOAD_OFF: { |
| size_t begin_body; |
| |
| begin_body = BUS_MESSAGE_BODY_BEGIN(m); |
| |
| if (idx + d->vec.size > begin_body) { |
| struct bus_body_part *part; |
| |
| /* Contains body material */ |
| |
| part = message_append_part(m); |
| if (!part) { |
| r = -ENOMEM; |
| goto fail; |
| } |
| |
| /* A -1 offset is NUL padding. */ |
| part->is_zero = d->vec.offset == ~0ULL; |
| |
| if (idx >= begin_body) { |
| if (!part->is_zero) |
| part->data = (uint8_t* )k + d->vec.offset; |
| part->size = d->vec.size; |
| } else { |
| if (!part->is_zero) |
| part->data = (uint8_t*) k + d->vec.offset + (begin_body - idx); |
| part->size = d->vec.size - (begin_body - idx); |
| } |
| |
| part->sealed = true; |
| } |
| |
| idx += d->vec.size; |
| break; |
| } |
| |
| case KDBUS_ITEM_PAYLOAD_MEMFD: { |
| struct bus_body_part *part; |
| |
| if (idx < BUS_MESSAGE_BODY_BEGIN(m)) { |
| r = -EBADMSG; |
| goto fail; |
| } |
| |
| part = message_append_part(m); |
| if (!part) { |
| r = -ENOMEM; |
| goto fail; |
| } |
| |
| part->memfd = d->memfd.fd; |
| part->memfd_offset = d->memfd.start; |
| part->size = d->memfd.size; |
| part->sealed = true; |
| |
| idx += d->memfd.size; |
| break; |
| } |
| |
| case KDBUS_ITEM_PIDS: |
| |
| /* The PID/TID might be missing, when the data |
| * is faked by a bus proxy and it lacks that |
| * information about the real client (since |
| * SO_PEERCRED is used for that). Also kernel |
| * namespacing might make some of this data |
| * unavailable when untranslatable. */ |
| |
| if (d->pids.pid > 0) { |
| m->creds.pid = (pid_t) d->pids.pid; |
| m->creds.mask |= SD_BUS_CREDS_PID & bus->creds_mask; |
| } |
| |
| if (d->pids.tid > 0) { |
| m->creds.tid = (pid_t) d->pids.tid; |
| m->creds.mask |= SD_BUS_CREDS_TID & bus->creds_mask; |
| } |
| |
| if (d->pids.ppid > 0) { |
| m->creds.ppid = (pid_t) d->pids.ppid; |
| m->creds.mask |= SD_BUS_CREDS_PPID & bus->creds_mask; |
| } else if (d->pids.pid == 1) { |
| m->creds.ppid = 0; |
| m->creds.mask |= SD_BUS_CREDS_PPID & bus->creds_mask; |
| } |
| |
| break; |
| |
| case KDBUS_ITEM_CREDS: |
| |
| /* EUID/SUID/FSUID/EGID/SGID/FSGID might be |
| * missing too (see above). */ |
| |
| if ((uid_t) d->creds.uid != UID_INVALID) { |
| m->creds.uid = (uid_t) d->creds.uid; |
| m->creds.mask |= SD_BUS_CREDS_UID & bus->creds_mask; |
| } |
| |
| if ((uid_t) d->creds.euid != UID_INVALID) { |
| m->creds.euid = (uid_t) d->creds.euid; |
| m->creds.mask |= SD_BUS_CREDS_EUID & bus->creds_mask; |
| } |
| |
| if ((uid_t) d->creds.suid != UID_INVALID) { |
| m->creds.suid = (uid_t) d->creds.suid; |
| m->creds.mask |= SD_BUS_CREDS_SUID & bus->creds_mask; |
| } |
| |
| if ((uid_t) d->creds.fsuid != UID_INVALID) { |
| m->creds.fsuid = (uid_t) d->creds.fsuid; |
| m->creds.mask |= SD_BUS_CREDS_FSUID & bus->creds_mask; |
| } |
| |
| if ((gid_t) d->creds.gid != GID_INVALID) { |
| m->creds.gid = (gid_t) d->creds.gid; |
| m->creds.mask |= SD_BUS_CREDS_GID & bus->creds_mask; |
| } |
| |
| if ((gid_t) d->creds.egid != GID_INVALID) { |
| m->creds.egid = (gid_t) d->creds.egid; |
| m->creds.mask |= SD_BUS_CREDS_EGID & bus->creds_mask; |
| } |
| |
| if ((gid_t) d->creds.sgid != GID_INVALID) { |
| m->creds.sgid = (gid_t) d->creds.sgid; |
| m->creds.mask |= SD_BUS_CREDS_SGID & bus->creds_mask; |
| } |
| |
| if ((gid_t) d->creds.fsgid != GID_INVALID) { |
| m->creds.fsgid = (gid_t) d->creds.fsgid; |
| m->creds.mask |= SD_BUS_CREDS_FSGID & bus->creds_mask; |
| } |
| |
| break; |
| |
| case KDBUS_ITEM_TIMESTAMP: |
| message_set_timestamp(bus, m, &d->timestamp); |
| break; |
| |
| case KDBUS_ITEM_PID_COMM: |
| m->creds.comm = d->str; |
| m->creds.mask |= SD_BUS_CREDS_COMM & bus->creds_mask; |
| break; |
| |
| case KDBUS_ITEM_TID_COMM: |
| m->creds.tid_comm = d->str; |
| m->creds.mask |= SD_BUS_CREDS_TID_COMM & bus->creds_mask; |
| break; |
| |
| case KDBUS_ITEM_EXE: |
| m->creds.exe = d->str; |
| m->creds.mask |= SD_BUS_CREDS_EXE & bus->creds_mask; |
| break; |
| |
| case KDBUS_ITEM_CMDLINE: |
| m->creds.cmdline = d->str; |
| m->creds.cmdline_size = l; |
| m->creds.mask |= SD_BUS_CREDS_CMDLINE & bus->creds_mask; |
| break; |
| |
| case KDBUS_ITEM_CGROUP: |
| m->creds.cgroup = d->str; |
| 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; |
| |
| r = bus_get_root_path(bus); |
| if (r < 0) |
| goto fail; |
| |
| m->creds.cgroup_root = bus->cgroup_root; |
| break; |
| |
| case KDBUS_ITEM_AUDIT: |
| m->creds.audit_session_id = (uint32_t) d->audit.sessionid; |
| m->creds.mask |= SD_BUS_CREDS_AUDIT_SESSION_ID & bus->creds_mask; |
| |
| m->creds.audit_login_uid = (uid_t) d->audit.loginuid; |
| m->creds.mask |= SD_BUS_CREDS_AUDIT_LOGIN_UID & bus->creds_mask; |
| break; |
| |
| case KDBUS_ITEM_CAPS: |
| if (d->caps.last_cap != cap_last_cap() || |
| d->size - offsetof(struct kdbus_item, caps.caps) < DIV_ROUND_UP(d->caps.last_cap, 32U) * 4 * 4) { |
| r = -EBADMSG; |
| goto fail; |
| } |
| |
| m->creds.capability = d->caps.caps; |
| 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; |
| break; |
| |
| case KDBUS_ITEM_DST_NAME: |
| if (!service_name_is_valid(d->str)) { |
| r = -EBADMSG; |
| goto fail; |
| } |
| |
| destination = d->str; |
| break; |
| |
| case KDBUS_ITEM_OWNED_NAME: |
| if (!service_name_is_valid(d->name.name)) { |
| r = -EBADMSG; |
| goto fail; |
| } |
| |
| if (bus->creds_mask & SD_BUS_CREDS_WELL_KNOWN_NAMES) { |
| char **wkn; |
| size_t n; |
| |
| /* We just extend the array here, but |
| * do not allocate the strings inside |
| * of it, instead we just point to our |
| * buffer directly. */ |
| n = strv_length(m->creds.well_known_names); |
| wkn = realloc(m->creds.well_known_names, (n + 2) * sizeof(char*)); |
| if (!wkn) { |
| r = -ENOMEM; |
| goto fail; |
| } |
| |
| wkn[n] = d->name.name; |
| wkn[n+1] = NULL; |
| m->creds.well_known_names = wkn; |
| |
| m->creds.mask |= SD_BUS_CREDS_WELL_KNOWN_NAMES; |
| } |
| break; |
| |
| case KDBUS_ITEM_CONN_DESCRIPTION: |
| m->creds.description = d->str; |
| m->creds.mask |= SD_BUS_CREDS_DESCRIPTION & bus->creds_mask; |
| break; |
| |
| case KDBUS_ITEM_AUXGROUPS: |
| |
| if (bus->creds_mask & SD_BUS_CREDS_SUPPLEMENTARY_GIDS) { |
| size_t i, n; |
| gid_t *g; |
| |
| n = (d->size - offsetof(struct kdbus_item, data64)) / sizeof(uint64_t); |
| g = new(gid_t, n); |
| if (!g) { |
| r = -ENOMEM; |
| goto fail; |
| } |
| |
| for (i = 0; i < n; i++) |
| g[i] = d->data64[i]; |
| |
| m->creds.supplementary_gids = g; |
| m->creds.n_supplementary_gids = n; |
| m->creds.mask |= SD_BUS_CREDS_SUPPLEMENTARY_GIDS; |
| } |
| |
| break; |
| |
| case KDBUS_ITEM_FDS: |
| case KDBUS_ITEM_SECLABEL: |
| break; |
| |
| default: |
| log_debug("Got unknown field from kernel %llu", d->type); |
| } |
| } |
| |
| /* If we requested the list of well-known names to be appended |
| * and the sender had none no item for it will be |
| * attached. However, this does *not* mean that the kernel |
| * didn't want to provide this information to us. Hence, let's |
| * explicitly mark this information as available if it was |
| * requested. */ |
| m->creds.mask |= bus->creds_mask & SD_BUS_CREDS_WELL_KNOWN_NAMES; |
| |
| r = bus_message_parse_fields(m); |
| if (r < 0) |
| goto fail; |
| |
| /* Refuse messages if kdbus and dbus1 cookie doesn't match up */ |
| if ((uint64_t) m->header->dbus2.cookie != k->cookie) { |
| r = -EBADMSG; |
| goto fail; |
| } |
| |
| /* Refuse messages where the reply flag doesn't match up */ |
| if (!(m->header->flags & BUS_MESSAGE_NO_REPLY_EXPECTED) != !!(k->flags & KDBUS_MSG_EXPECT_REPLY)) { |
| r = -EBADMSG; |
| goto fail; |
| } |
| |
| /* Refuse reply messages where the reply cookie doesn't match up */ |
| if ((m->header->flags & BUS_MESSAGE_NO_REPLY_EXPECTED) && m->reply_cookie != k->cookie_reply) { |
| r = -EBADMSG; |
| goto fail; |
| } |
| |
| /* Refuse messages where the autostart flag doesn't match up */ |
| if (!(m->header->flags & BUS_MESSAGE_NO_AUTO_START) != !(k->flags & KDBUS_MSG_NO_AUTO_START)) { |
| r = -EBADMSG; |
| goto fail; |
| } |
| |
| /* Override information from the user header with data from the kernel */ |
| if (k->src_id == KDBUS_SRC_ID_KERNEL) |
| bus_message_set_sender_driver(bus, m); |
| else { |
| snprintf(m->sender_buffer, sizeof(m->sender_buffer), ":1.%llu", (unsigned long long) k->src_id); |
| m->sender = m->creds.unique_name = m->sender_buffer; |
| } |
| |
| if (destination) |
| m->destination = destination; |
| else if (k->dst_id == KDBUS_DST_ID_BROADCAST) |
| m->destination = NULL; |
| else if (k->dst_id == KDBUS_DST_ID_NAME) |
| m->destination = bus->unique_name; /* fill in unique name if the well-known name is missing */ |
| else { |
| snprintf(m->destination_buffer, sizeof(m->destination_buffer), ":1.%llu", (unsigned long long) k->dst_id); |
| m->destination = m->destination_buffer; |
| } |
| |
| /* We take possession of the kmsg struct now */ |
| m->kdbus = k; |
| m->release_kdbus = true; |
| m->free_fds = true; |
| fds = NULL; |
| |
| bus->rqueue[bus->rqueue_size++] = m; |
| |
| return 1; |
| |
| fail: |
| unset_memfds(m); |
| sd_bus_message_unref(m); |
| |
| return r; |
| } |
| |
| int bus_kernel_take_fd(sd_bus *b) { |
| struct kdbus_bloom_parameter *bloom = NULL; |
| struct kdbus_item *items, *item; |
| struct kdbus_cmd_hello *hello; |
| _cleanup_free_ char *g = NULL; |
| const char *name; |
| size_t l = 0, m = 0, sz; |
| int r; |
| |
| assert(b); |
| |
| if (b->is_server) |
| return -EINVAL; |
| |
| b->use_memfd = 1; |
| |
| if (b->description) { |
| g = bus_label_escape(b->description); |
| if (!g) |
| return -ENOMEM; |
| |
| name = g; |
| } else { |
| char pr[17] = {}; |
| |
| /* If no name is explicitly set, we'll include a hint |
| * indicating the library implementation, a hint which |
| * kind of bus this is and the thread name */ |
| |
| assert_se(prctl(PR_GET_NAME, (unsigned long) pr) >= 0); |
| |
| if (isempty(pr)) { |
| name = b->is_system ? "sd-system" : |
| b->is_user ? "sd-user" : "sd"; |
| } else { |
| _cleanup_free_ char *e = NULL; |
| |
| e = bus_label_escape(pr); |
| if (!e) |
| return -ENOMEM; |
| |
| g = strappend(b->is_system ? "sd-system-" : |
| b->is_user ? "sd-user-" : "sd-", |
| e); |
| if (!g) |
| return -ENOMEM; |
| |
| name = g; |
| } |
| |
| b->description = bus_label_unescape(name); |
| if (!b->description) |
| return -ENOMEM; |
| } |
| |
| m = strlen(name); |
| |
| sz = ALIGN8(offsetof(struct kdbus_cmd_hello, items)) + |
| ALIGN8(offsetof(struct kdbus_item, str) + m + 1); |
| |
| if (b->fake_creds_valid) |
| sz += ALIGN8(offsetof(struct kdbus_item, creds) + sizeof(struct kdbus_creds)); |
| |
| if (b->fake_pids_valid) |
| sz += ALIGN8(offsetof(struct kdbus_item, pids) + sizeof(struct kdbus_pids)); |
| |
| if (b->fake_label) { |
| l = strlen(b->fake_label); |
| sz += ALIGN8(offsetof(struct kdbus_item, str) + l + 1); |
| } |
| |
| hello = alloca0_align(sz, 8); |
| hello->size = sz; |
| hello->flags = b->hello_flags; |
| hello->attach_flags_send = _KDBUS_ATTACH_ANY; |
| hello->attach_flags_recv = b->attach_flags; |
| hello->pool_size = KDBUS_POOL_SIZE; |
| |
| item = hello->items; |
| |
| item->size = offsetof(struct kdbus_item, str) + m + 1; |
| item->type = KDBUS_ITEM_CONN_DESCRIPTION; |
| memcpy(item->str, name, m + 1); |
| item = KDBUS_ITEM_NEXT(item); |
| |
| if (b->fake_creds_valid) { |
| item->size = offsetof(struct kdbus_item, creds) + sizeof(struct kdbus_creds); |
| item->type = KDBUS_ITEM_CREDS; |
| item->creds = b->fake_creds; |
| |
| item = KDBUS_ITEM_NEXT(item); |
| } |
| |
| if (b->fake_pids_valid) { |
| item->size = offsetof(struct kdbus_item, pids) + sizeof(struct kdbus_pids); |
| item->type = KDBUS_ITEM_PIDS; |
| item->pids = b->fake_pids; |
| |
| item = KDBUS_ITEM_NEXT(item); |
| } |
| |
| if (b->fake_label) { |
| item->size = offsetof(struct kdbus_item, str) + l + 1; |
| item->type = KDBUS_ITEM_SECLABEL; |
| memcpy(item->str, b->fake_label, l+1); |
| } |
| |
| r = ioctl(b->input_fd, KDBUS_CMD_HELLO, hello); |
| if (r < 0) { |
| if (errno == ENOTTY) |
| /* If the ioctl is not supported we assume that the |
| * API version changed in a major incompatible way, |
| * let's indicate an API incompatibility in this |
| * case. */ |
| return -ESOCKTNOSUPPORT; |
| |
| return -errno; |
| } |
| |
| if (!b->kdbus_buffer) { |
| b->kdbus_buffer = mmap(NULL, KDBUS_POOL_SIZE, PROT_READ, MAP_SHARED, b->input_fd, 0); |
| if (b->kdbus_buffer == MAP_FAILED) { |
| b->kdbus_buffer = NULL; |
| r = -errno; |
| goto fail; |
| } |
| } |
| |
| /* The higher 32bit of the bus_flags fields are considered |
| * 'incompatible flags'. Refuse them all for now. */ |
| if (hello->bus_flags > 0xFFFFFFFFULL) { |
| r = -ESOCKTNOSUPPORT; |
| goto fail; |
| } |
| |
| /* extract bloom parameters from items */ |
| items = (void*)((uint8_t*)b->kdbus_buffer + hello->offset); |
| KDBUS_FOREACH(item, items, hello->items_size) { |
| switch (item->type) { |
| case KDBUS_ITEM_BLOOM_PARAMETER: |
| bloom = &item->bloom_parameter; |
| break; |
| } |
| } |
| |
| if (!bloom || !bloom_validate_parameters((size_t) bloom->size, (unsigned) bloom->n_hash)) { |
| r = -EOPNOTSUPP; |
| goto fail; |
| } |
| |
| b->bloom_size = (size_t) bloom->size; |
| b->bloom_n_hash = (unsigned) bloom->n_hash; |
| |
| if (asprintf(&b->unique_name, ":1.%llu", (unsigned long long) hello->id) < 0) { |
| r = -ENOMEM; |
| goto fail; |
| } |
| |
| b->unique_id = hello->id; |
| |
| b->is_kernel = true; |
| b->bus_client = true; |
| b->can_fds = !!(hello->flags & KDBUS_HELLO_ACCEPT_FD); |
| b->message_version = 2; |
| b->message_endian = BUS_NATIVE_ENDIAN; |
| |
| /* the kernel told us the UUID of the underlying bus */ |
| memcpy(b->server_id.bytes, hello->id128, sizeof(b->server_id.bytes)); |
| |
| /* free returned items */ |
| (void) bus_kernel_cmd_free(b, hello->offset); |
| return bus_start_running(b); |
| |
| fail: |
| (void) bus_kernel_cmd_free(b, hello->offset); |
| return r; |
| } |
| |
| int bus_kernel_connect(sd_bus *b) { |
| assert(b); |
| assert(b->input_fd < 0); |
| assert(b->output_fd < 0); |
| assert(b->kernel); |
| |
| if (b->is_server) |
| return -EINVAL; |
| |
| b->input_fd = open(b->kernel, O_RDWR|O_NOCTTY|O_CLOEXEC); |
| if (b->input_fd < 0) |
| return -errno; |
| |
| b->output_fd = b->input_fd; |
| |
| return bus_kernel_take_fd(b); |
| } |
| |
| int bus_kernel_cmd_free(sd_bus *bus, uint64_t offset) { |
| struct kdbus_cmd_free cmd = { |
| .size = sizeof(cmd), |
| .offset = offset, |
| }; |
| int r; |
| |
| assert(bus); |
| assert(bus->is_kernel); |
| |
| r = ioctl(bus->input_fd, KDBUS_CMD_FREE, &cmd); |
| if (r < 0) |
| return -errno; |
| |
| return 0; |
| } |
| |
| static void close_kdbus_msg(sd_bus *bus, struct kdbus_msg *k) { |
| struct kdbus_item *d; |
| |
| assert(bus); |
| assert(k); |
| |
| KDBUS_ITEM_FOREACH(d, k, items) { |
| if (d->type == KDBUS_ITEM_FDS) |
| close_many(d->fds, (d->size - offsetof(struct kdbus_item, fds)) / sizeof(int)); |
| else if (d->type == KDBUS_ITEM_PAYLOAD_MEMFD) |
| safe_close(d->memfd.fd); |
| } |
| |
| bus_kernel_cmd_free(bus, (uint8_t*) k - (uint8_t*) bus->kdbus_buffer); |
| } |
| |
| int bus_kernel_write_message(sd_bus *bus, sd_bus_message *m, bool hint_sync_call) { |
| struct kdbus_cmd_send cmd = { }; |
| int r; |
| |
| assert(bus); |
| assert(m); |
| assert(bus->state == BUS_RUNNING); |
| |
| /* If we can't deliver, we want room for the error message */ |
| r = bus_rqueue_make_room(bus); |
| if (r < 0) |
| return r; |
| |
| r = bus_message_setup_kmsg(bus, m); |
| if (r < 0) |
| return r; |
| |
| cmd.size = sizeof(cmd); |
| cmd.msg_address = (uintptr_t)m->kdbus; |
| |
| /* If this is a synchronous method call, then let's tell the |
| * kernel, so that it can pass CPU time/scheduling to the |
| * destination for the time, if it wants to. If we |
| * synchronously wait for the result anyway, we won't need CPU |
| * anyway. */ |
| if (hint_sync_call) { |
| m->kdbus->flags |= KDBUS_MSG_EXPECT_REPLY; |
| cmd.flags |= KDBUS_SEND_SYNC_REPLY; |
| } |
| |
| r = ioctl(bus->output_fd, KDBUS_CMD_SEND, &cmd); |
| if (r < 0) { |
| _cleanup_bus_error_free_ sd_bus_error error = SD_BUS_ERROR_NULL; |
| sd_bus_message *reply; |
| |
| if (errno == EAGAIN || errno == EINTR) |
| return 0; |
| else if (errno == ENXIO || errno == ESRCH) { |
| |
| /* ENXIO: unique name not known |
| * ESRCH: well-known name not known */ |
| |
| if (m->header->type == SD_BUS_MESSAGE_METHOD_CALL) |
| sd_bus_error_setf(&error, SD_BUS_ERROR_SERVICE_UNKNOWN, "Destination %s not known", m->destination); |
| else { |
| log_debug("Could not deliver message to %s as destination is not known. Ignoring.", m->destination); |
| return 0; |
| } |
| |
| } else if (errno == EADDRNOTAVAIL) { |
| |
| /* EADDRNOTAVAIL: activation is possible, but turned off in request flags */ |
| |
| if (m->header->type == SD_BUS_MESSAGE_METHOD_CALL) |
| sd_bus_error_setf(&error, SD_BUS_ERROR_SERVICE_UNKNOWN, "Activation of %s not requested", m->destination); |
| else { |
| log_debug("Could not deliver message to %s as destination is not activated. Ignoring.", m->destination); |
| return 0; |
| } |
| } else |
| return -errno; |
| |
| r = bus_message_new_synthetic_error( |
| bus, |
| BUS_MESSAGE_COOKIE(m), |
| &error, |
| &reply); |
| |
| if (r < 0) |
| return r; |
| |
| r = bus_seal_synthetic_message(bus, reply); |
| if (r < 0) |
| return r; |
| |
| bus->rqueue[bus->rqueue_size++] = reply; |
| |
| } else if (hint_sync_call) { |
| struct kdbus_msg *k; |
| |
| k = (struct kdbus_msg *)((uint8_t *)bus->kdbus_buffer + cmd.reply.offset); |
| assert(k); |
| |
| if (k->payload_type == KDBUS_PAYLOAD_DBUS) { |
| |
| r = bus_kernel_make_message(bus, k); |
| if (r < 0) { |
| close_kdbus_msg(bus, k); |
| |
| /* Anybody can send us invalid messages, let's just drop them. */ |
| if (r == -EBADMSG || r == -EPROTOTYPE) |
| log_debug_errno(r, "Ignoring invalid synchronous reply: %m"); |
| else |
| return r; |
| } |
| } else { |
| log_debug("Ignoring message with unknown payload type %llu.", (unsigned long long) k->payload_type); |
| close_kdbus_msg(bus, k); |
| } |
| } |
| |
| return 1; |
| } |
| |
| static int push_name_owner_changed( |
| sd_bus *bus, |
| const char *name, |
| const char *old_owner, |
| const char *new_owner, |
| const struct kdbus_timestamp *ts) { |
| |
| _cleanup_bus_message_unref_ sd_bus_message *m = NULL; |
| int r; |
| |
| assert(bus); |
| |
| r = sd_bus_message_new_signal( |
| bus, |
| &m, |
| "/org/freedesktop/DBus", |
| "org.freedesktop.DBus", |
| "NameOwnerChanged"); |
| if (r < 0) |
| return r; |
| |
| r = sd_bus_message_append(m, "sss", name, old_owner, new_owner); |
| if (r < 0) |
| return r; |
| |
| bus_message_set_sender_driver(bus, m); |
| message_set_timestamp(bus, m, ts); |
| |
| r = bus_seal_synthetic_message(bus, m); |
| if (r < 0) |
| return r; |
| |
| bus->rqueue[bus->rqueue_size++] = m; |
| m = NULL; |
| |
| return 1; |
| } |
| |
| static int translate_name_change( |
| sd_bus *bus, |
| const struct kdbus_msg *k, |
| const struct kdbus_item *d, |
| const struct kdbus_timestamp *ts) { |
| |
| char new_owner[UNIQUE_NAME_MAX], old_owner[UNIQUE_NAME_MAX]; |
| |
| assert(bus); |
| assert(k); |
| assert(d); |
| |
| if (d->type == KDBUS_ITEM_NAME_ADD || (d->name_change.old_id.flags & (KDBUS_NAME_IN_QUEUE|KDBUS_NAME_ACTIVATOR))) |
| old_owner[0] = 0; |
| else |
| sprintf(old_owner, ":1.%llu", (unsigned long long) d->name_change.old_id.id); |
| |
| if (d->type == KDBUS_ITEM_NAME_REMOVE || (d->name_change.new_id.flags & (KDBUS_NAME_IN_QUEUE|KDBUS_NAME_ACTIVATOR))) { |
| |
| if (isempty(old_owner)) |
| return 0; |
| |
| new_owner[0] = 0; |
| } else |
| sprintf(new_owner, ":1.%llu", (unsigned long long) d->name_change.new_id.id); |
| |
| return push_name_owner_changed(bus, d->name_change.name, old_owner, new_owner, ts); |
| } |
| |
| static int translate_id_change( |
| sd_bus *bus, |
| const struct kdbus_msg *k, |
| const struct kdbus_item *d, |
| const struct kdbus_timestamp *ts) { |
| |
| char owner[UNIQUE_NAME_MAX]; |
| |
| assert(bus); |
| assert(k); |
| assert(d); |
| |
| sprintf(owner, ":1.%llu", d->id_change.id); |
| |
| return push_name_owner_changed( |
| bus, owner, |
| d->type == KDBUS_ITEM_ID_ADD ? NULL : owner, |
| d->type == KDBUS_ITEM_ID_ADD ? owner : NULL, |
| ts); |
| } |
| |
| static int translate_reply( |
| sd_bus *bus, |
| const struct kdbus_msg *k, |
| const struct kdbus_item *d, |
| const struct kdbus_timestamp *ts) { |
| |
| _cleanup_bus_message_unref_ sd_bus_message *m = NULL; |
| int r; |
| |
| assert(bus); |
| assert(k); |
| assert(d); |
| |
| r = bus_message_new_synthetic_error( |
| bus, |
| k->cookie_reply, |
| d->type == KDBUS_ITEM_REPLY_TIMEOUT ? |
| &SD_BUS_ERROR_MAKE_CONST(SD_BUS_ERROR_NO_REPLY, "Method call timed out") : |
| &SD_BUS_ERROR_MAKE_CONST(SD_BUS_ERROR_NO_REPLY, "Method call peer died"), |
| &m); |
| if (r < 0) |
| return r; |
| |
| message_set_timestamp(bus, m, ts); |
| |
| r = bus_seal_synthetic_message(bus, m); |
| if (r < 0) |
| return r; |
| |
| bus->rqueue[bus->rqueue_size++] = m; |
| m = NULL; |
| |
| return 1; |
| } |
| |
| static int bus_kernel_translate_message(sd_bus *bus, struct kdbus_msg *k) { |
| static int (* const translate[])(sd_bus *bus, const struct kdbus_msg *k, const struct kdbus_item *d, const struct kdbus_timestamp *ts) = { |
| [KDBUS_ITEM_NAME_ADD - _KDBUS_ITEM_KERNEL_BASE] = translate_name_change, |
| [KDBUS_ITEM_NAME_REMOVE - _KDBUS_ITEM_KERNEL_BASE] = translate_name_change, |
| [KDBUS_ITEM_NAME_CHANGE - _KDBUS_ITEM_KERNEL_BASE] = translate_name_change, |
| |
| [KDBUS_ITEM_ID_ADD - _KDBUS_ITEM_KERNEL_BASE] = translate_id_change, |
| [KDBUS_ITEM_ID_REMOVE - _KDBUS_ITEM_KERNEL_BASE] = translate_id_change, |
| |
| [KDBUS_ITEM_REPLY_TIMEOUT - _KDBUS_ITEM_KERNEL_BASE] = translate_reply, |
| [KDBUS_ITEM_REPLY_DEAD - _KDBUS_ITEM_KERNEL_BASE] = translate_reply, |
| }; |
| |
| struct kdbus_item *d, *found = NULL; |
| struct kdbus_timestamp *ts = NULL; |
| |
| assert(bus); |
| assert(k); |
| assert(k->payload_type == KDBUS_PAYLOAD_KERNEL); |
| |
| KDBUS_ITEM_FOREACH(d, k, items) { |
| if (d->type == KDBUS_ITEM_TIMESTAMP) |
| ts = &d->timestamp; |
| |
| if (d->type >= _KDBUS_ITEM_KERNEL_BASE && d->type < _KDBUS_ITEM_KERNEL_BASE + ELEMENTSOF(translate)) { |
| if (found) |
| return -EBADMSG; |
| found = d; |
| } else |
| log_debug("Got unknown field from kernel %llu", d->type); |
| } |
| |
| if (!found) { |
| log_debug("Didn't find a kernel message to translate."); |
| return 0; |
| } |
| |
| return translate[found->type - _KDBUS_ITEM_KERNEL_BASE](bus, k, found, ts); |
| } |
| |
| int bus_kernel_read_message(sd_bus *bus, bool hint_priority, int64_t priority) { |
| struct kdbus_cmd_recv recv = { .size = sizeof(recv) }; |
| struct kdbus_msg *k; |
| int r; |
| |
| assert(bus); |
| |
| r = bus_rqueue_make_room(bus); |
| if (r < 0) |
| return r; |
| |
| if (hint_priority) { |
| recv.flags |= KDBUS_RECV_USE_PRIORITY; |
| recv.priority = priority; |
| } |
| |
| r = ioctl(bus->input_fd, KDBUS_CMD_RECV, &recv); |
| if (recv.return_flags & KDBUS_RECV_RETURN_DROPPED_MSGS) |
| log_debug("%s: kdbus reports %" PRIu64 " dropped broadcast messages, ignoring.", strna(bus->description), (uint64_t) recv.dropped_msgs); |
| if (r < 0) { |
| if (errno == EAGAIN) |
| return 0; |
| |
| return -errno; |
| } |
| |
| k = (struct kdbus_msg *)((uint8_t *)bus->kdbus_buffer + recv.msg.offset); |
| if (k->payload_type == KDBUS_PAYLOAD_DBUS) { |
| r = bus_kernel_make_message(bus, k); |
| |
| /* Anybody can send us invalid messages, let's just drop them. */ |
| if (r == -EBADMSG || r == -EPROTOTYPE) { |
| log_debug_errno(r, "Ignoring invalid message: %m"); |
| r = 0; |
| } |
| |
| } else if (k->payload_type == KDBUS_PAYLOAD_KERNEL) |
| r = bus_kernel_translate_message(bus, k); |
| else { |
| log_debug("Ignoring message with unknown payload type %llu.", (unsigned long long) k->payload_type); |
| r = 0; |
| } |
| |
| if (r <= 0) |
| close_kdbus_msg(bus, k); |
| |
| return r < 0 ? r : 1; |
| } |
| |
| int bus_kernel_pop_memfd(sd_bus *bus, void **address, size_t *mapped, size_t *allocated) { |
| struct memfd_cache *c; |
| int fd; |
| |
| assert(address); |
| assert(mapped); |
| assert(allocated); |
| |
| if (!bus || !bus->is_kernel) |
| return -EOPNOTSUPP; |
| |
| assert_se(pthread_mutex_lock(&bus->memfd_cache_mutex) >= 0); |
| |
| if (bus->n_memfd_cache <= 0) { |
| int r; |
| |
| assert_se(pthread_mutex_unlock(&bus->memfd_cache_mutex) >= 0); |
| |
| r = memfd_new(bus->description); |
| if (r < 0) |
| return r; |
| |
| *address = NULL; |
| *mapped = 0; |
| *allocated = 0; |
| return r; |
| } |
| |
| c = &bus->memfd_cache[--bus->n_memfd_cache]; |
| |
| assert(c->fd >= 0); |
| assert(c->mapped == 0 || c->address); |
| |
| *address = c->address; |
| *mapped = c->mapped; |
| *allocated = c->allocated; |
| fd = c->fd; |
| |
| assert_se(pthread_mutex_unlock(&bus->memfd_cache_mutex) >= 0); |
| |
| return fd; |
| } |
| |
| static void close_and_munmap(int fd, void *address, size_t size) { |
| if (size > 0) |
| assert_se(munmap(address, PAGE_ALIGN(size)) >= 0); |
| |
| safe_close(fd); |
| } |
| |
| void bus_kernel_push_memfd(sd_bus *bus, int fd, void *address, size_t mapped, size_t allocated) { |
| struct memfd_cache *c; |
| uint64_t max_mapped = PAGE_ALIGN(MEMFD_CACHE_ITEM_SIZE_MAX); |
| |
| assert(fd >= 0); |
| assert(mapped == 0 || address); |
| |
| if (!bus || !bus->is_kernel) { |
| close_and_munmap(fd, address, mapped); |
| return; |
| } |
| |
| assert_se(pthread_mutex_lock(&bus->memfd_cache_mutex) >= 0); |
| |
| if (bus->n_memfd_cache >= ELEMENTSOF(bus->memfd_cache)) { |
| assert_se(pthread_mutex_unlock(&bus->memfd_cache_mutex) >= 0); |
| |
| close_and_munmap(fd, address, mapped); |
| return; |
| } |
| |
| c = &bus->memfd_cache[bus->n_memfd_cache++]; |
| c->fd = fd; |
| c->address = address; |
| |
| /* If overly long, let's return a bit to the OS */ |
| if (mapped > max_mapped) { |
| assert_se(memfd_set_size(fd, max_mapped) >= 0); |
| assert_se(munmap((uint8_t*) address + max_mapped, PAGE_ALIGN(mapped - max_mapped)) >= 0); |
| c->mapped = c->allocated = max_mapped; |
| } else { |
| c->mapped = mapped; |
| c->allocated = allocated; |
| } |
| |
| assert_se(pthread_mutex_unlock(&bus->memfd_cache_mutex) >= 0); |
| } |
| |
| void bus_kernel_flush_memfd(sd_bus *b) { |
| unsigned i; |
| |
| assert(b); |
| |
| for (i = 0; i < b->n_memfd_cache; i++) |
| close_and_munmap(b->memfd_cache[i].fd, b->memfd_cache[i].address, b->memfd_cache[i].mapped); |
| } |
| |
| uint64_t request_name_flags_to_kdbus(uint64_t flags) { |
| uint64_t f = 0; |
| |
| if (flags & SD_BUS_NAME_ALLOW_REPLACEMENT) |
| f |= KDBUS_NAME_ALLOW_REPLACEMENT; |
| |
| if (flags & SD_BUS_NAME_REPLACE_EXISTING) |
| f |= KDBUS_NAME_REPLACE_EXISTING; |
| |
| if (flags & SD_BUS_NAME_QUEUE) |
| f |= KDBUS_NAME_QUEUE; |
| |
| return f; |
| } |
| |
| uint64_t attach_flags_to_kdbus(uint64_t mask) { |
| uint64_t m = 0; |
| |
| if (mask & (SD_BUS_CREDS_UID|SD_BUS_CREDS_EUID|SD_BUS_CREDS_SUID|SD_BUS_CREDS_FSUID| |
| SD_BUS_CREDS_GID|SD_BUS_CREDS_EGID|SD_BUS_CREDS_SGID|SD_BUS_CREDS_FSGID)) |
| m |= KDBUS_ATTACH_CREDS; |
| |
| if (mask & (SD_BUS_CREDS_PID|SD_BUS_CREDS_TID|SD_BUS_CREDS_PPID)) |
| m |= KDBUS_ATTACH_PIDS; |
| |
| if (mask & SD_BUS_CREDS_COMM) |
| m |= KDBUS_ATTACH_PID_COMM; |
| |
| if (mask & SD_BUS_CREDS_TID_COMM) |
| m |= KDBUS_ATTACH_TID_COMM; |
| |
| if (mask & SD_BUS_CREDS_EXE) |
| m |= KDBUS_ATTACH_EXE; |
| |
| if (mask & SD_BUS_CREDS_CMDLINE) |
| m |= KDBUS_ATTACH_CMDLINE; |
| |
| 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)) |
| m |= KDBUS_ATTACH_CGROUP; |
| |
| if (mask & (SD_BUS_CREDS_EFFECTIVE_CAPS|SD_BUS_CREDS_PERMITTED_CAPS|SD_BUS_CREDS_INHERITABLE_CAPS|SD_BUS_CREDS_BOUNDING_CAPS)) |
| m |= KDBUS_ATTACH_CAPS; |
| |
| if (mask & SD_BUS_CREDS_SELINUX_CONTEXT) |
| m |= KDBUS_ATTACH_SECLABEL; |
| |
| if (mask & (SD_BUS_CREDS_AUDIT_SESSION_ID|SD_BUS_CREDS_AUDIT_LOGIN_UID)) |
| m |= KDBUS_ATTACH_AUDIT; |
| |
| if (mask & SD_BUS_CREDS_WELL_KNOWN_NAMES) |
| m |= KDBUS_ATTACH_NAMES; |
| |
| if (mask & SD_BUS_CREDS_DESCRIPTION) |
| m |= KDBUS_ATTACH_CONN_DESCRIPTION; |
| |
| if (mask & SD_BUS_CREDS_SUPPLEMENTARY_GIDS) |
| m |= KDBUS_ATTACH_AUXGROUPS; |
| |
| return m; |
| } |
| |
| int bus_kernel_create_bus(const char *name, bool world, char **s) { |
| struct kdbus_cmd *make; |
| struct kdbus_item *n; |
| size_t l; |
| int fd; |
| |
| assert(name); |
| assert(s); |
| |
| fd = open("/sys/fs/kdbus/control", O_RDWR|O_NOCTTY|O_CLOEXEC); |
| if (fd < 0) |
| return -errno; |
| |
| l = strlen(name); |
| make = alloca0_align(offsetof(struct kdbus_cmd, items) + |
| ALIGN8(offsetof(struct kdbus_item, bloom_parameter) + sizeof(struct kdbus_bloom_parameter)) + |
| ALIGN8(offsetof(struct kdbus_item, data64) + sizeof(uint64_t)) + |
| ALIGN8(offsetof(struct kdbus_item, data64) + sizeof(uint64_t)) + |
| ALIGN8(offsetof(struct kdbus_item, str) + DECIMAL_STR_MAX(uid_t) + 1 + l + 1), |
| 8); |
| |
| make->size = offsetof(struct kdbus_cmd, items); |
| |
| /* Set the bloom parameters */ |
| n = make->items; |
| n->size = offsetof(struct kdbus_item, bloom_parameter) + |
| sizeof(struct kdbus_bloom_parameter); |
| n->type = KDBUS_ITEM_BLOOM_PARAMETER; |
| n->bloom_parameter.size = DEFAULT_BLOOM_SIZE; |
| n->bloom_parameter.n_hash = DEFAULT_BLOOM_N_HASH; |
| |
| assert_cc(DEFAULT_BLOOM_SIZE > 0); |
| assert_cc(DEFAULT_BLOOM_N_HASH > 0); |
| |
| make->size += ALIGN8(n->size); |
| |
| /* The buses we create make no restrictions on what metadata |
| * peers can read from incoming messages. */ |
| n = KDBUS_ITEM_NEXT(n); |
| n->type = KDBUS_ITEM_ATTACH_FLAGS_RECV; |
| n->size = offsetof(struct kdbus_item, data64) + sizeof(uint64_t); |
| n->data64[0] = _KDBUS_ATTACH_ANY; |
| make->size += ALIGN8(n->size); |
| |
| /* Provide all metadata via bus-owner queries */ |
| n = KDBUS_ITEM_NEXT(n); |
| n->type = KDBUS_ITEM_ATTACH_FLAGS_SEND; |
| n->size = offsetof(struct kdbus_item, data64) + sizeof(uint64_t); |
| n->data64[0] = _KDBUS_ATTACH_ANY; |
| make->size += ALIGN8(n->size); |
| |
| /* Set the a good name */ |
| n = KDBUS_ITEM_NEXT(n); |
| sprintf(n->str, UID_FMT "-%s", getuid(), name); |
| n->size = offsetof(struct kdbus_item, str) + strlen(n->str) + 1; |
| n->type = KDBUS_ITEM_MAKE_NAME; |
| make->size += ALIGN8(n->size); |
| |
| make->flags = world ? KDBUS_MAKE_ACCESS_WORLD : 0; |
| |
| if (ioctl(fd, KDBUS_CMD_BUS_MAKE, make) < 0) { |
| safe_close(fd); |
| |
| /* Major API change? then the ioctls got shuffled around. */ |
| if (errno == ENOTTY) |
| return -ESOCKTNOSUPPORT; |
| |
| return -errno; |
| } |
| |
| if (s) { |
| char *p; |
| |
| p = strjoin("/sys/fs/kdbus/", n->str, "/bus", NULL); |
| if (!p) { |
| safe_close(fd); |
| return -ENOMEM; |
| } |
| |
| *s = p; |
| } |
| |
| return fd; |
| } |
| |
| int bus_kernel_open_bus_fd(const char *bus, char **path) { |
| char *p; |
| int fd; |
| size_t len; |
| |
| assert(bus); |
| |
| len = strlen("/sys/fs/kdbus/") + DECIMAL_STR_MAX(uid_t) + 1 + strlen(bus) + strlen("/bus") + 1; |
| |
| if (path) { |
| p = new(char, len); |
| if (!p) |
| return -ENOMEM; |
| } else |
| p = newa(char, len); |
| |
| sprintf(p, "/sys/fs/kdbus/" UID_FMT "-%s/bus", getuid(), bus); |
| |
| fd = open(p, O_RDWR|O_NOCTTY|O_CLOEXEC); |
| if (fd < 0) { |
| if (path) |
| free(p); |
| |
| return -errno; |
| } |
| |
| if (path) |
| *path = p; |
| |
| return fd; |
| } |
| |
| int bus_kernel_create_endpoint(const char *bus_name, const char *ep_name, char **ep_path) { |
| _cleanup_free_ char *path = NULL; |
| struct kdbus_cmd *make; |
| struct kdbus_item *n; |
| const char *name; |
| int fd; |
| |
| fd = bus_kernel_open_bus_fd(bus_name, &path); |
| if (fd < 0) |
| return fd; |
| |
| make = alloca0_align(ALIGN8(offsetof(struct kdbus_cmd, items)) + |
| ALIGN8(offsetof(struct kdbus_item, str) + DECIMAL_STR_MAX(uid_t) + 1 + strlen(ep_name) + 1), |
| 8); |
| make->size = ALIGN8(offsetof(struct kdbus_cmd, items)); |
| make->flags = KDBUS_MAKE_ACCESS_WORLD; |
| |
| n = make->items; |
| sprintf(n->str, UID_FMT "-%s", getuid(), ep_name); |
| n->size = offsetof(struct kdbus_item, str) + strlen(n->str) + 1; |
| n->type = KDBUS_ITEM_MAKE_NAME; |
| make->size += ALIGN8(n->size); |
| name = n->str; |
| |
| if (ioctl(fd, KDBUS_CMD_ENDPOINT_MAKE, make) < 0) { |
| safe_close(fd); |
| return -errno; |
| } |
| |
| if (ep_path) { |
| char *p; |
| |
| p = strjoin(dirname(path), "/", name, NULL); |
| if (!p) { |
| safe_close(fd); |
| return -ENOMEM; |
| } |
| |
| *ep_path = p; |
| } |
| |
| return fd; |
| } |
| |
| int bus_kernel_try_close(sd_bus *bus) { |
| struct kdbus_cmd byebye = { .size = sizeof(byebye) }; |
| |
| assert(bus); |
| assert(bus->is_kernel); |
| |
| if (ioctl(bus->input_fd, KDBUS_CMD_BYEBYE, &byebye) < 0) |
| return -errno; |
| |
| return 0; |
| } |
| |
| int bus_kernel_drop_one(int fd) { |
| struct kdbus_cmd_recv recv = { |
| .size = sizeof(recv), |
| .flags = KDBUS_RECV_DROP, |
| }; |
| |
| assert(fd >= 0); |
| |
| if (ioctl(fd, KDBUS_CMD_RECV, &recv) < 0) |
| return -errno; |
| |
| return 0; |
| } |
| |
| int bus_kernel_realize_attach_flags(sd_bus *bus) { |
| struct kdbus_cmd *update; |
| struct kdbus_item *n; |
| |
| assert(bus); |
| assert(bus->is_kernel); |
| |
| update = alloca0_align(offsetof(struct kdbus_cmd, items) + |
| ALIGN8(offsetof(struct kdbus_item, data64) + sizeof(uint64_t)), |
| 8); |
| |
| n = update->items; |
| n->type = KDBUS_ITEM_ATTACH_FLAGS_RECV; |
| n->size = offsetof(struct kdbus_item, data64) + sizeof(uint64_t); |
| n->data64[0] = bus->attach_flags; |
| |
| update->size = |
| offsetof(struct kdbus_cmd, items) + |
| ALIGN8(n->size); |
| |
| if (ioctl(bus->input_fd, KDBUS_CMD_UPDATE, update) < 0) |
| return -errno; |
| |
| return 0; |
| } |
| |
| int bus_kernel_fix_attach_mask(void) { |
| _cleanup_free_ char *mask = NULL; |
| uint64_t m = (uint64_t) -1; |
| char buf[2+16+2]; |
| int r; |
| |
| /* By default we don't want any kdbus metadata fields to be |
| * suppressed, hence we reset the kernel mask for it to |
| * (uint64_t) -1. If the module argument was overwritten by |
| * the kernel cmdline, we leave it as is. */ |
| |
| r = get_proc_cmdline_key("kdbus.attach_flags_mask=", &mask); |
| if (r < 0) |
| return log_warning_errno(r, "Failed to read kernel command line: %m"); |
| |
| if (r == 0) { |
| sprintf(buf, "0x%" PRIx64 "\n", m); |
| r = write_string_file("/sys/module/kdbus/parameters/attach_flags_mask", buf); |
| if (r < 0) |
| return log_full_errno(IN_SET(r, -ENOENT, -EROFS) ? LOG_DEBUG : LOG_WARNING, r, |
| "Failed to write kdbus attach mask: %m"); |
| } |
| |
| return 0; |
| } |
| |
| int bus_kernel_get_bus_name(sd_bus *bus, char **name) { |
| struct kdbus_cmd_info cmd = { |
| .size = sizeof(struct kdbus_cmd_info), |
| }; |
| struct kdbus_info *info; |
| struct kdbus_item *item; |
| char *n = NULL; |
| int r; |
| |
| assert(bus); |
| assert(name); |
| assert(bus->is_kernel); |
| |
| r = ioctl(bus->input_fd, KDBUS_CMD_BUS_CREATOR_INFO, &cmd); |
| if (r < 0) |
| return -errno; |
| |
| info = (struct kdbus_info*) ((uint8_t*) bus->kdbus_buffer + cmd.offset); |
| |
| KDBUS_ITEM_FOREACH(item, info, items) |
| if (item->type == KDBUS_ITEM_MAKE_NAME) { |
| r = free_and_strdup(&n, item->str); |
| break; |
| } |
| |
| bus_kernel_cmd_free(bus, cmd.offset); |
| |
| if (r < 0) |
| return r; |
| if (!n) |
| return -EIO; |
| |
| *name = n; |
| return 0; |
| } |