#endif
#include <fcntl.h>
+#include <malloc.h>
+#include <sys/mman.h>
#include "util.h"
#include "bus-kernel.h"
#include "bus-bloom.h"
-#define KDBUS_FOREACH_ITEM(i, k) \
- for ((i) = (k)->items; \
- (uint8_t*) (i) < (uint8_t*) (k) + (k)->size; \
- (i) = (struct kdbus_msg_data*) ((uint8_t*) (i) + ALIGN8((i)->size)))
+#define KDBUS_ITEM_NEXT(item) \
+ (typeof(item))(((uint8_t *)item) + ALIGN8((item)->size))
+
+#define KDBUS_ITEM_FOREACH(item, head) \
+ for (item = (head)->items; \
+ (uint8_t *)(item) < (uint8_t *)(head) + (head)->size; \
+ item = KDBUS_ITEM_NEXT(item))
+
+#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;
return 1;
}
-static void append_payload_vec(struct kdbus_msg_data **d, const void *p, size_t sz) {
+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);
- (*d)->size = offsetof(struct kdbus_msg_data, vec) + sizeof(struct kdbus_vec);
+ (*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.size = sz;
- *d = (struct kdbus_msg_data*) ((uint8_t*) *d + (*d)->size);
+ *d = (struct kdbus_item *) ((uint8_t*) *d + (*d)->size);
}
-static void append_destination(struct kdbus_msg_data **d, const char *s, size_t length) {
+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_msg_data, str) + length + 1;
+ (*d)->size = offsetof(struct kdbus_item, str) + length + 1;
(*d)->type = KDBUS_MSG_DST_NAME;
memcpy((*d)->str, s, length + 1);
- *d = (struct kdbus_msg_data*) ((uint8_t*) *d + (*d)->size);
+ *d = (struct kdbus_item *) ((uint8_t*) *d + (*d)->size);
}
-static void* append_bloom(struct kdbus_msg_data **d, size_t length) {
+static void* append_bloom(struct kdbus_item **d, size_t length) {
void *r;
assert(d);
*d = ALIGN8_PTR(*d);
- (*d)->size = offsetof(struct kdbus_msg_data, data) + length;
+ (*d)->size = offsetof(struct kdbus_item, data) + length;
(*d)->type = KDBUS_MSG_BLOOM;
r = (*d)->data;
- *d = (struct kdbus_msg_data*) ((uint8_t*) *d + (*d)->size);
+ *d = (struct kdbus_item *) ((uint8_t*) *d + (*d)->size);
return r;
}
+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_MSG_FDS;
+ memcpy((*d)->fds, fds, sizeof(int) * n_fds);
+
+ *d = (struct kdbus_item *) ((uint8_t*) *d + (*d)->size);
+}
+
static int bus_message_setup_bloom(sd_bus_message *m, void *bloom) {
unsigned i;
int r;
}
static int bus_message_setup_kmsg(sd_bus *b, sd_bus_message *m) {
- struct kdbus_msg_data *d;
+ struct kdbus_item *d;
bool well_known;
uint64_t unique;
size_t sz, dl;
sz = offsetof(struct kdbus_msg, items);
/* Add in fixed header, fields header and payload */
- sz += 3 * ALIGN8(offsetof(struct kdbus_msg_data, vec) + sizeof(struct kdbus_vec));
+ sz += 3 * ALIGN8(offsetof(struct kdbus_item, vec) + sizeof(struct kdbus_vec));
/* Add space for bloom filter */
- sz += ALIGN8(offsetof(struct kdbus_msg_data, data) + BLOOM_SIZE);
+ sz += ALIGN8(offsetof(struct kdbus_item, data) + BLOOM_SIZE);
/* Add in well-known destination header */
if (well_known) {
dl = strlen(m->destination);
- sz += ALIGN8(offsetof(struct kdbus_msg_data, str) + dl + 1);
+ sz += ALIGN8(offsetof(struct kdbus_item, str) + dl + 1);
}
- m->kdbus = aligned_alloc(8, sz);
+ /* 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)
return -ENOMEM;
if (m->kdbus->dst_id == KDBUS_DST_ID_BROADCAST) {
void *p;
- /* For now, let's add a mask all bloom filter */
p = append_bloom(&d, BLOOM_SIZE);
r = bus_message_setup_bloom(m, p);
if (r < 0) {
}
}
+ 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);
}
int bus_kernel_take_fd(sd_bus *b) {
- struct kdbus_cmd_hello hello = {
- .conn_flags =
- KDBUS_CMD_HELLO_ACCEPT_FD|
- KDBUS_CMD_HELLO_ACCEPT_MMAP|
- KDBUS_CMD_HELLO_ATTACH_COMM|
- KDBUS_CMD_HELLO_ATTACH_EXE|
- KDBUS_CMD_HELLO_ATTACH_CMDLINE|
- KDBUS_CMD_HELLO_ATTACH_CGROUP|
- KDBUS_CMD_HELLO_ATTACH_CAPS|
- KDBUS_CMD_HELLO_ATTACH_SECLABEL|
- KDBUS_CMD_HELLO_ATTACH_AUDIT
- };
+ uint8_t h[ALIGN8(sizeof(struct kdbus_cmd_hello)) +
+ ALIGN8(KDBUS_ITEM_HEADER_SIZE) +
+ ALIGN8(sizeof(struct kdbus_vec))] = {};
+
+ struct kdbus_cmd_hello *hello = (struct kdbus_cmd_hello*) h;
+
int r;
assert(b);
if (b->is_server)
return -EINVAL;
- r = ioctl(b->input_fd, KDBUS_CMD_HELLO, &hello);
+ if (!b->kdbus_buffer) {
+ b->kdbus_buffer = mmap(NULL, KDBUS_POOL_SIZE, PROT_READ|PROT_WRITE, MAP_ANONYMOUS|MAP_PRIVATE, -1, 0);
+ if (b->kdbus_buffer == MAP_FAILED) {
+ b->kdbus_buffer = NULL;
+ return -errno;
+ }
+ }
+
+ hello->size = sizeof(h);
+ hello->conn_flags =
+ KDBUS_HELLO_ACCEPT_FD|
+ KDBUS_HELLO_ATTACH_COMM|
+ KDBUS_HELLO_ATTACH_EXE|
+ KDBUS_HELLO_ATTACH_CMDLINE|
+ KDBUS_HELLO_ATTACH_CGROUP|
+ KDBUS_HELLO_ATTACH_CAPS|
+ KDBUS_HELLO_ATTACH_SECLABEL|
+ KDBUS_HELLO_ATTACH_AUDIT;
+
+ hello->items[0].type = KDBUS_HELLO_POOL;
+ hello->items[0].size = KDBUS_ITEM_HEADER_SIZE + sizeof(struct kdbus_vec);
+ hello->items[0].vec.address = (uint64_t) b->kdbus_buffer;
+ hello->items[0].vec.size = KDBUS_POOL_SIZE;
+
+ r = ioctl(b->input_fd, KDBUS_CMD_HELLO, hello);
if (r < 0)
return -errno;
/* The higher 32bit of both flags fields are considered
* 'incompatible flags'. Refuse them all for now. */
- if (hello.bus_flags > 0xFFFFFFFFULL ||
- hello.conn_flags > 0xFFFFFFFFULL)
+ if (hello->bus_flags > 0xFFFFFFFFULL ||
+ hello->conn_flags > 0xFFFFFFFFULL)
return -ENOTSUP;
- if (hello.bloom_size != BLOOM_SIZE)
+ if (hello->bloom_size != BLOOM_SIZE)
return -ENOTSUP;
- if (asprintf(&b->unique_name, ":1.%llu", (unsigned long long) hello.id) < 0)
+ if (asprintf(&b->unique_name, ":1.%llu", (unsigned long long) hello->id) < 0)
return -ENOMEM;
b->is_kernel = true;
b->bus_client = true;
+ b->can_fds = true;
r = bus_start_running(b);
if (r < 0)
return 1;
}
-static void close_kdbus_msg(struct kdbus_msg *k) {
- struct kdbus_msg_data *d;
+static void close_kdbus_msg(sd_bus *bus, struct kdbus_msg *k) {
+ struct kdbus_item *d;
+
+ assert(bus);
+ assert(k);
- KDBUS_FOREACH_ITEM(d, k) {
+ ioctl(bus->input_fd, KDBUS_CMD_MSG_RELEASE, k);
- if (d->type != KDBUS_MSG_UNIX_FDS)
+ KDBUS_ITEM_FOREACH(d, k) {
+
+ if (d->type != KDBUS_MSG_FDS)
continue;
- close_many(d->fds, (d->size - offsetof(struct kdbus_msg_data, fds)) / sizeof(int));
+ close_many(d->fds, (d->size - offsetof(struct kdbus_item, fds)) / sizeof(int));
}
}
+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_msg_data *d;
+ struct kdbus_item *d;
unsigned n_payload = 0, n_fds = 0;
_cleanup_free_ int *fds = NULL;
struct bus_header *h = NULL;
if (k->payload_type != KDBUS_PAYLOAD_DBUS1)
return 0;
- KDBUS_FOREACH_ITEM(d, k) {
+ KDBUS_ITEM_FOREACH(d, k) {
size_t l;
- l = d->size - offsetof(struct kdbus_msg_data, data);
+ l = d->size - offsetof(struct kdbus_item, data);
- if (d->type == KDBUS_MSG_PAYLOAD) {
+ if (d->type == KDBUS_MSG_PAYLOAD_VEC) {
if (!h) {
- if (l < sizeof(struct bus_header))
+ if (d->vec.size < sizeof(struct bus_header))
return -EBADMSG;
- h = (struct bus_header*) d->data;
+ h = (struct bus_header*)(uintptr_t) d->vec.address;
}
n_payload++;
- n_bytes += l;
+ n_bytes += d->vec.size;
- } else if (d->type == KDBUS_MSG_UNIX_FDS) {
+ } else if (d->type == KDBUS_MSG_FDS) {
int *f;
unsigned j;
return -ENOMEM;
fds = f;
- memcpy(fds + n_fds, d->fds, j);
+ memcpy(fds + n_fds, d->fds, sizeof(int) * j);
n_fds += j;
} else if (d->type == KDBUS_MSG_DST_NAME)
if (n_bytes != total)
return -EBADMSG;
+ //if (n_payload > 2)
+ // return -EBADMSG;
+
r = bus_message_from_header(h, sizeof(struct bus_header), fds, n_fds, NULL, seclabel, 0, &m);
if (r < 0)
return r;
- KDBUS_FOREACH_ITEM(d, k) {
+ KDBUS_ITEM_FOREACH(d, k) {
size_t l;
- l = d->size - offsetof(struct kdbus_msg_data, data);
+ l = d->size - offsetof(struct kdbus_item, data);
- if (d->type == KDBUS_MSG_PAYLOAD) {
+ if (d->type == KDBUS_MSG_PAYLOAD_VEC) {
- if (idx == sizeof(struct bus_header) &&
- l == ALIGN8(BUS_MESSAGE_FIELDS_SIZE(m)))
- m->fields = d->data;
- else if (idx == sizeof(struct bus_header) + ALIGN8(BUS_MESSAGE_FIELDS_SIZE(m)) &&
- l == BUS_MESSAGE_BODY_SIZE(m))
- m->body = d->data;
- else if (!(idx == 0 && l == sizeof(struct bus_header))) {
- sd_bus_message_unref(m);
- return -EBADMSG;
- }
+ range_contains(idx, d->vec.size, ALIGN8(sizeof(struct bus_header)), BUS_MESSAGE_FIELDS_SIZE(m),
+ (void *)(uintptr_t) d->vec.address, &m->fields);
+ range_contains(idx, d->vec.size, ALIGN8(sizeof(struct bus_header)) + ALIGN8(BUS_MESSAGE_FIELDS_SIZE(m)),
+ BUS_MESSAGE_BODY_SIZE(m), (void *)(uintptr_t) d->vec.address, &m->body);
+
+ idx += d->vec.size;
- idx += l;
} else if (d->type == KDBUS_MSG_SRC_CREDS) {
m->pid_starttime = d->creds.starttime / NSEC_PER_USEC;
m->uid = d->creds.uid;
m->cmdline_length = l;
} else if (d->type == KDBUS_MSG_SRC_CGROUP)
m->cgroup = d->str;
- else
+ else if (d->type == KDBUS_MSG_SRC_AUDIT)
+ m->audit = &d->audit;
+ 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 &&
+ 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) ||
+ (BUS_MESSAGE_BODY_SIZE(m) > 0 && !m->body)) {
+ sd_bus_message_unref(m);
+ return -EBADMSG;
+ }
+
r = bus_message_parse_fields(m);
if (r < 0) {
sd_bus_message_unref(m);
/* We take possession of the kmsg struct now */
m->kdbus = k;
- m->free_kdbus = true;
+ m->bus = sd_bus_ref(bus);
+ m->release_kdbus = true;
m->free_fds = true;
fds = NULL;
int bus_kernel_read_message(sd_bus *bus, sd_bus_message **m) {
struct kdbus_msg *k;
- size_t sz = 1024;
int r;
assert(bus);
assert(m);
- for (;;) {
- void *q;
-
- q = aligned_alloc(8, sz);
- if (!q)
- return -errno;
-
- free(bus->rbuffer);
- k = bus->rbuffer = q;
- k->size = sz;
-
- /* 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 = ioctl(bus->input_fd, KDBUS_CMD_MSG_RECV, bus->rbuffer);
- if (r >= 0)
- break;
-
+ r = ioctl(bus->input_fd, KDBUS_CMD_MSG_RECV, &k);
+ if (r < 0) {
if (errno == EAGAIN)
return 0;
- if (errno != ENOBUFS)
- return -errno;
-
- sz *= 2;
+ 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)
- bus->rbuffer = NULL;
- else
- close_kdbus_msg(k);
+ if (r <= 0)
+ close_kdbus_msg(bus, k);
return r < 0 ? r : 1;
}
int bus_kernel_create(const char *name, char **s) {
struct kdbus_cmd_bus_make *make;
+ struct kdbus_item *n, *cg;
size_t l;
int fd;
char *p;
return -errno;
l = strlen(name);
- make = alloca0(offsetof(struct kdbus_cmd_bus_make, name) + DECIMAL_STR_MAX(uid_t) + 1 + l + 1);
- sprintf(make->name, "%lu-%s", (unsigned long) getuid(), name);
- make->size = offsetof(struct kdbus_cmd_bus_make, name) + strlen(make->name) + 1;
- make->flags = KDBUS_ACCESS_WORLD | KDBUS_POLICY_OPEN;
+ make = alloca0(offsetof(struct kdbus_cmd_bus_make, items) +
+ KDBUS_ITEM_HEADER_SIZE + sizeof(uint64_t) +
+ KDBUS_ITEM_HEADER_SIZE + DECIMAL_STR_MAX(uid_t) + 1 + l + 1);
+
+ cg = make->items;
+ cg->type = KDBUS_MAKE_CGROUP;
+ cg->data64[0] = 1;
+ cg->size = KDBUS_ITEM_HEADER_SIZE + sizeof(uint64_t);
+
+ n = KDBUS_ITEM_NEXT(cg);
+ n->type = KDBUS_MAKE_NAME;
+ sprintf(n->str, "%lu-%s", (unsigned long) getuid(), name);
+ n->size = KDBUS_ITEM_HEADER_SIZE + strlen(n->str) + 1;
+
+ make->size = offsetof(struct kdbus_cmd_bus_make, items) + cg->size + n->size;
+ make->flags = KDBUS_MAKE_POLICY_OPEN;
make->bus_flags = 0;
make->bloom_size = BLOOM_SIZE;
- make->cgroup_id = 1;
assert_cc(BLOOM_SIZE % 8 == 0);
- p = strjoin("/dev/kdbus/", make->name, "/bus", NULL);
+ p = strjoin("/dev/kdbus/", n->str, "/bus", NULL);
if (!p)
return -ENOMEM;
~ianmdlvl / elogind.git / blobdiff