#define KDBUS_ITEM_HEADER_SIZE offsetof(struct kdbus_item, data)
#define KDBUS_ITEM_SIZE(s) ALIGN8((s) + KDBUS_ITEM_HEADER_SIZE)
-#define KDBUS_POOL_SIZE (4*1024*1024)
-
static int parse_unique_name(const char *s, uint64_t *id) {
int r;
static void append_payload_vec(struct kdbus_item **d, const void *p, size_t sz) {
assert(d);
- assert(p);
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_MSG_PAYLOAD_VEC;
- (*d)->vec.address = (uint64_t) p;
+ (*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 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_MSG_PAYLOAD_MEMFD;
+ (*d)->memfd.fd = memfd;
+ (*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);
sz = offsetof(struct kdbus_msg, items);
+ assert_cc(ALIGN8(offsetof(struct kdbus_item, vec) + sizeof(struct kdbus_vec)) ==
+ ALIGN8(offsetof(struct kdbus_item, memfd) + sizeof(struct kdbus_memfd)));
+
/* Add in fixed header, fields header and payload */
- sz += (1 + !!m->fields + m->n_body_parts) *
+ sz += (1 + m->n_body_parts) *
ALIGN8(offsetof(struct kdbus_item, vec) + sizeof(struct kdbus_vec));
/* Add space for bloom filter */
sz += ALIGN8(offsetof(struct kdbus_item, fds) + sizeof(int)*m->n_fds);
m->kdbus = memalign(8, sz);
- if (!m->kdbus)
- return -ENOMEM;
+ if (!m->kdbus) {
+ r = -ENOMEM;
+ goto fail;
+ }
+ m->free_kdbus = true;
memset(m->kdbus, 0, sz);
m->kdbus->flags =
if (well_known)
append_destination(&d, m->destination, dl);
- append_payload_vec(&d, m->header, sizeof(*m->header));
+ 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 && m->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->size);
+ continue;
+ }
- if (m->fields)
- append_payload_vec(&d, m->fields, ALIGN8(m->header->fields_size));
+ /* 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;
- MESSAGE_FOREACH_PART(part, i, m)
append_payload_vec(&d, part->data, part->size);
+ }
if (m->kdbus->dst_id == KDBUS_DST_ID_BROADCAST) {
void *p;
p = append_bloom(&d, BLOOM_SIZE);
r = bus_message_setup_bloom(m, p);
- if (r < 0) {
- free(m->kdbus);
- m->kdbus = NULL;
- return -r;
- }
+ if (r < 0)
+ goto fail;
}
if (m->n_fds > 0)
m->kdbus->size = (uint8_t*) d - (uint8_t*) m->kdbus;
assert(m->kdbus->size <= sz);
- m->free_kdbus = true;
-
return 0;
+
+fail:
+ m->poisoned = true;
+ return r;
}
int bus_kernel_take_fd(sd_bus *b) {
KDBUS_ITEM_FOREACH(d, k) {
- if (d->type != KDBUS_MSG_FDS)
- continue;
-
- close_many(d->fds, (d->size - offsetof(struct kdbus_item, fds)) / sizeof(int));
+ if (d->type == KDBUS_MSG_FDS)
+ close_many(d->fds, (d->size - offsetof(struct kdbus_item, fds)) / sizeof(int));
+ else if (d->type == KDBUS_MSG_PAYLOAD_MEMFD)
+ close_nointr_nofail(d->memfd.fd);
}
}
-static bool range_contains(
- size_t astart, size_t asize,
- size_t bstart, size_t bsize,
- void *a, void **b) {
-
- if (bstart < astart)
- return false;
-
- if (bstart + bsize > astart + asize)
- return false;
-
- *b = (uint8_t*) a + (bstart - astart);
-
- return true;
-}
-
static int bus_kernel_make_message(sd_bus *bus, struct kdbus_msg *k, sd_bus_message **ret) {
sd_bus_message *m = NULL;
struct kdbus_item *d;
- unsigned n_payload = 0, n_fds = 0;
+ unsigned n_fds = 0;
_cleanup_free_ int *fds = NULL;
struct bus_header *h = NULL;
size_t total, n_bytes = 0, idx = 0;
if (d->type == KDBUS_MSG_PAYLOAD_VEC) {
if (!h) {
- if (d->vec.size < sizeof(struct bus_header))
- return -EBADMSG;
-
h = UINT64_TO_PTR(d->vec.address);
+
+ if (!bus_header_is_complete(h, d->vec.size))
+ return -EBADMSG;
}
- n_payload++;
n_bytes += d->vec.size;
+ } else if (d->type == KDBUS_MSG_PAYLOAD_MEMFD) {
+
+ if (!h)
+ return -EBADMSG;
+
+ n_bytes += d->memfd.size;
+
} else if (d->type == KDBUS_MSG_FDS) {
int *f;
unsigned j;
memcpy(fds + n_fds, d->fds, sizeof(int) * j);
n_fds += j;
- } else if (d->type == KDBUS_MSG_DST_NAME)
- destination = d->str;
- else if (d->type == KDBUS_MSG_SRC_SECLABEL)
+ } else if (d->type == KDBUS_MSG_SRC_SECLABEL)
seclabel = d->str;
}
if (!h)
return -EBADMSG;
- r = bus_header_size(h, &total);
+ r = bus_header_message_size(h, &total);
if (r < 0)
return r;
if (d->type == KDBUS_MSG_PAYLOAD_VEC) {
size_t begin_body;
- /* Fill in fields material */
- range_contains(idx, d->vec.size, ALIGN8(sizeof(struct bus_header)), BUS_MESSAGE_FIELDS_SIZE(m),
- UINT64_TO_PTR(d->vec.address), &m->fields);
-
- begin_body = ALIGN8(sizeof(struct bus_header)) + ALIGN8(BUS_MESSAGE_FIELDS_SIZE(m));
+ begin_body = BUS_MESSAGE_BODY_BEGIN(m);
if (idx + d->vec.size > begin_body) {
struct bus_body_part *part;
part = message_append_part(m);
if (!part) {
- sd_bus_message_unref(m);
- return -ENOMEM;
+ r = -ENOMEM;
+ goto fail;
}
if (idx >= begin_body) {
- part->data = (void*) d->vec.address;
+ part->data = UINT64_TO_PTR(d->vec.address);
part->size = d->vec.size;
} else {
- part->data = (uint8_t*) (uintptr_t) d->vec.address + (begin_body - idx);
+ part->data = d->vec.address != 0 ? (uint8_t*) UINT64_TO_PTR(d->vec.address) + (begin_body - idx) : NULL;
part->size = d->vec.size - (begin_body - idx);
}
+ part->is_zero = d->vec.address == 0;
part->sealed = true;
}
idx += d->vec.size;
+ } else if (d->type == KDBUS_MSG_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;
} else if (d->type == KDBUS_MSG_SRC_CREDS) {
m->pid_starttime = d->creds.starttime / NSEC_PER_USEC;
else if (d->type == KDBUS_MSG_SRC_CAPS) {
m->capability = d->data;
m->capability_size = l;
- } else if (d->type != KDBUS_MSG_FDS &&
- d->type != KDBUS_MSG_DST_NAME &&
+ } else if (d->type == KDBUS_MSG_DST_NAME)
+ destination = d->str;
+ else if (d->type != KDBUS_MSG_FDS &&
d->type != KDBUS_MSG_SRC_SECLABEL)
log_debug("Got unknown field from kernel %llu", d->type);
}
- if ((BUS_MESSAGE_FIELDS_SIZE(m) > 0 && !m->fields)) {
- sd_bus_message_unref(m);
- return -EBADMSG;
- }
-
r = bus_message_parse_fields(m);
- if (r < 0) {
- sd_bus_message_unref(m);
- return r;
- }
+ if (r < 0)
+ goto fail;
if (k->src_id == KDBUS_SRC_ID_KERNEL)
m->sender = "org.freedesktop.DBus";
*ret = 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, sd_bus_message **m) {
return -errno;
}
-
-/* /\* Let's tell valgrind that there's really no need to */
-/* * initialize this fully. This should be removed again */
-/* * when valgrind learned the kdbus ioctls natively. *\/ */
-/* #ifdef HAVE_VALGRIND_MEMCHECK_H */
-/* VALGRIND_MAKE_MEM_DEFINED(k, sz); */
-/* #endif */
-
-
r = bus_kernel_make_message(bus, k, m);
if (r <= 0)
close_kdbus_msg(bus, k);
int bus_kernel_pop_memfd(sd_bus *bus, void **address, size_t *size) {
struct memfd_cache *c;
+ int fd;
assert(address);
assert(size);
if (!bus || !bus->is_kernel)
return -ENOTSUP;
+ assert_se(pthread_mutex_lock(&bus->memfd_cache_mutex) == 0);
+
if (bus->n_memfd_cache <= 0) {
- int fd, r;
+ int r;
+
+ assert_se(pthread_mutex_unlock(&bus->memfd_cache_mutex) == 0);
r = ioctl(bus->input_fd, KDBUS_CMD_MEMFD_NEW, &fd);
if (r < 0)
*address = c->address;
*size = c->size;
+ 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);
- return c->fd;
+ close_nointr_nofail(fd);
}
void bus_kernel_push_memfd(sd_bus *bus, int fd, void *address, size_t size) {
assert(fd >= 0);
assert(size == 0 || address);
- if (!bus || !bus->is_kernel ||
- bus->n_memfd_cache >= ELEMENTSOF(bus->memfd_cache)) {
+ if (!bus || !bus->is_kernel) {
+ close_and_munmap(fd, address, size);
+ return;
+ }
- if (size > 0)
- assert_se(munmap(address, PAGE_ALIGN(size)) == 0);
+ assert_se(pthread_mutex_lock(&bus->memfd_cache_mutex) == 0);
- close_nointr_nofail(fd);
+ if (bus->n_memfd_cache >= ELEMENTSOF(bus->memfd_cache)) {
+ assert_se(pthread_mutex_unlock(&bus->memfd_cache_mutex) == 0);
+
+ close_and_munmap(fd, address, size);
return;
}
c->size = MEMFD_CACHE_ITEM_SIZE_MAX;
} else
c->size = size;
+
+ assert_se(pthread_mutex_unlock(&bus->memfd_cache_mutex) == 0);
}
void bus_kernel_flush_memfd(sd_bus *b) {
~ianmdlvl / elogind.git / blobdiff