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-rw-r--r--src/libsystemd/bus-kernel.c604
1 files changed, 302 insertions, 302 deletions
diff --git a/src/libsystemd/bus-kernel.c b/src/libsystemd/bus-kernel.c
index d3eeb52425..f85b4d5676 100644
--- a/src/libsystemd/bus-kernel.c
+++ b/src/libsystemd/bus-kernel.c
@@ -320,6 +320,308 @@ fail:
return r;
}
+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 *h = NULL;
+ size_t total, n_bytes = 0, idx = 0;
+ const char *destination = NULL, *seclabel = NULL;
+ 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 (!h) {
+ h = (struct bus_header *)((uint8_t *)k + d->vec.offset);
+
+ if (!bus_header_is_complete(h, d->vec.size))
+ return -EBADMSG;
+ }
+
+ n_bytes += d->vec.size;
+ break;
+
+ case KDBUS_ITEM_PAYLOAD_MEMFD:
+ if (!h)
+ return -EBADMSG;
+
+ n_bytes += d->memfd.size;
+ 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 (!h)
+ return -EBADMSG;
+
+ r = bus_header_message_size(h, &total);
+ if (r < 0)
+ return r;
+
+ if (n_bytes != total)
+ return -EBADMSG;
+
+ /* on kdbus we only speak native endian gvariant, never dbus1
+ * marshalling or reverse endian */
+ if (h->version != 2 ||
+ h->endian != BUS_NATIVE_ENDIAN)
+ return -EPROTOTYPE;
+
+ r = bus_message_from_header(bus, h, sizeof(struct bus_header), 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->size = d->memfd.size;
+ part->sealed = true;
+
+ idx += d->memfd.size;
+ break;
+ }
+
+ case KDBUS_ITEM_CREDS:
+ /* UID/GID/PID are always valid */
+ m->creds.uid = (uid_t) d->creds.uid;
+ m->creds.gid = (gid_t) d->creds.gid;
+ m->creds.pid = (pid_t) d->creds.pid;
+ m->creds.mask |= (SD_BUS_CREDS_UID|SD_BUS_CREDS_GID|SD_BUS_CREDS_PID) & bus->creds_mask;
+
+ /* The PID starttime/TID might be missing
+ * however, when the data is faked by some
+ * data bus proxy and it lacks that
+ * information about the real client since
+ * SO_PEERCRED is used for that */
+
+ if (d->creds.starttime > 0) {
+ m->creds.pid_starttime = d->creds.starttime / NSEC_PER_USEC;
+ m->creds.mask |= SD_BUS_CREDS_PID_STARTTIME & bus->creds_mask;
+ }
+
+ if (d->creds.tid > 0) {
+ m->creds.tid = (pid_t) d->creds.tid;
+ m->creds.mask |= SD_BUS_CREDS_TID & bus->creds_mask;
+ }
+ break;
+
+ case KDBUS_ITEM_TIMESTAMP:
+ m->realtime = d->timestamp.realtime_ns / NSEC_PER_USEC;
+ m->monotonic = d->timestamp.monotonic_ns / NSEC_PER_USEC;
+ 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;
+
+ if (!bus->cgroup_root) {
+ r = cg_get_root_path(&bus->cgroup_root);
+ 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.audit_login_uid = (uid_t) d->audit.loginuid;
+ m->creds.mask |= (SD_BUS_CREDS_AUDIT_SESSION_ID|SD_BUS_CREDS_AUDIT_LOGIN_UID) & bus->creds_mask;
+ break;
+
+ case KDBUS_ITEM_CAPS:
+ m->creds.capability = d->data;
+ m->creds.capability_size = l;
+ 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))
+ return -EBADMSG;
+
+ destination = d->str;
+ break;
+
+ case KDBUS_ITEM_NAME:
+ if (!service_name_is_valid(d->name.name))
+ return -EBADMSG;
+
+ r = strv_extend(&m->creds.well_known_names, d->name.name);
+ if (r < 0)
+ goto fail;
+ break;
+
+ case KDBUS_ITEM_FDS:
+ case KDBUS_ITEM_SECLABEL:
+ break;
+
+ default:
+ log_debug("Got unknown field from kernel %llu", d->type);
+ }
+ }
+
+ r = bus_message_parse_fields(m);
+ if (r < 0)
+ goto fail;
+
+ /* Override information from the user header with data from the kernel */
+ if (k->src_id == KDBUS_SRC_ID_KERNEL)
+ m->sender = m->creds.unique_name = (char*) "org.freedesktop.DBus";
+ 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:
+ if (m) {
+ struct bus_body_part *part;
+ unsigned i;
+
+ /* Make sure the memfds are not freed twice */
+ MESSAGE_FOREACH_PART(part, i, m)
+ if (part->memfd >= 0)
+ part->memfd = -1;
+
+ sd_bus_message_unref(m);
+ }
+
+ return r;
+}
+
int bus_kernel_take_fd(sd_bus *b) {
struct kdbus_cmd_hello *hello;
struct kdbus_item *item;
@@ -644,308 +946,6 @@ static int bus_kernel_translate_message(sd_bus *bus, struct kdbus_msg *k) {
return translate[found->type - _KDBUS_ITEM_KERNEL_BASE](bus, k, found);
}
-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 *h = NULL;
- size_t total, n_bytes = 0, idx = 0;
- const char *destination = NULL, *seclabel = NULL;
- 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 (!h) {
- h = (struct bus_header *)((uint8_t *)k + d->vec.offset);
-
- if (!bus_header_is_complete(h, d->vec.size))
- return -EBADMSG;
- }
-
- n_bytes += d->vec.size;
- break;
-
- case KDBUS_ITEM_PAYLOAD_MEMFD:
- if (!h)
- return -EBADMSG;
-
- n_bytes += d->memfd.size;
- 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 (!h)
- return -EBADMSG;
-
- r = bus_header_message_size(h, &total);
- if (r < 0)
- return r;
-
- if (n_bytes != total)
- return -EBADMSG;
-
- /* on kdbus we only speak native endian gvariant, never dbus1
- * marshalling or reverse endian */
- if (h->version != 2 ||
- h->endian != BUS_NATIVE_ENDIAN)
- return -EPROTOTYPE;
-
- r = bus_message_from_header(bus, h, sizeof(struct bus_header), 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->size = d->memfd.size;
- part->sealed = true;
-
- idx += d->memfd.size;
- break;
- }
-
- case KDBUS_ITEM_CREDS:
- /* UID/GID/PID are always valid */
- m->creds.uid = (uid_t) d->creds.uid;
- m->creds.gid = (gid_t) d->creds.gid;
- m->creds.pid = (pid_t) d->creds.pid;
- m->creds.mask |= (SD_BUS_CREDS_UID|SD_BUS_CREDS_GID|SD_BUS_CREDS_PID) & bus->creds_mask;
-
- /* The PID starttime/TID might be missing
- * however, when the data is faked by some
- * data bus proxy and it lacks that
- * information about the real client since
- * SO_PEERCRED is used for that */
-
- if (d->creds.starttime > 0) {
- m->creds.pid_starttime = d->creds.starttime / NSEC_PER_USEC;
- m->creds.mask |= SD_BUS_CREDS_PID_STARTTIME & bus->creds_mask;
- }
-
- if (d->creds.tid > 0) {
- m->creds.tid = (pid_t) d->creds.tid;
- m->creds.mask |= SD_BUS_CREDS_TID & bus->creds_mask;
- }
- break;
-
- case KDBUS_ITEM_TIMESTAMP:
- m->realtime = d->timestamp.realtime_ns / NSEC_PER_USEC;
- m->monotonic = d->timestamp.monotonic_ns / NSEC_PER_USEC;
- 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;
-
- if (!bus->cgroup_root) {
- r = cg_get_root_path(&bus->cgroup_root);
- 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.audit_login_uid = (uid_t) d->audit.loginuid;
- m->creds.mask |= (SD_BUS_CREDS_AUDIT_SESSION_ID|SD_BUS_CREDS_AUDIT_LOGIN_UID) & bus->creds_mask;
- break;
-
- case KDBUS_ITEM_CAPS:
- m->creds.capability = d->data;
- m->creds.capability_size = l;
- 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))
- return -EBADMSG;
-
- destination = d->str;
- break;
-
- case KDBUS_ITEM_NAME:
- if (!service_name_is_valid(d->name.name))
- return -EBADMSG;
-
- r = strv_extend(&m->creds.well_known_names, d->name.name);
- if (r < 0)
- goto fail;
- break;
-
- case KDBUS_ITEM_FDS:
- case KDBUS_ITEM_SECLABEL:
- break;
-
- default:
- log_debug("Got unknown field from kernel %llu", d->type);
- }
- }
-
- r = bus_message_parse_fields(m);
- if (r < 0)
- goto fail;
-
- /* Override information from the user header with data from the kernel */
- if (k->src_id == KDBUS_SRC_ID_KERNEL)
- m->sender = m->creds.unique_name = (char*) "org.freedesktop.DBus";
- 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:
- if (m) {
- struct bus_body_part *part;
- unsigned i;
-
- /* Make sure the memfds are not freed twice */
- MESSAGE_FOREACH_PART(part, i, m)
- if (part->memfd >= 0)
- part->memfd = -1;
-
- sd_bus_message_unref(m);
- }
-
- return r;
-}
-
int bus_kernel_read_message(sd_bus *bus) {
struct kdbus_cmd_recv recv = {};
struct kdbus_msg *k;
generated by cgit v1.2.3-54-g00ecf (git 2.45.2) at 2024-12-11 08:59:16 +0000