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-rw-r--r--src/libsystemd-bus/bus-kernel.c66
-rw-r--r--src/libsystemd-bus/bus-message.c8
-rw-r--r--src/libsystemd-bus/kdbus.h21
3 files changed, 48 insertions, 47 deletions
diff --git a/src/libsystemd-bus/bus-kernel.c b/src/libsystemd-bus/bus-kernel.c
index 0ece1f014d..ad0d573149 100644
--- a/src/libsystemd-bus/bus-kernel.c
+++ b/src/libsystemd-bus/bus-kernel.c
@@ -313,12 +313,7 @@ fail:
}
int bus_kernel_take_fd(sd_bus *b) {
- 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;
-
+ struct kdbus_cmd_hello hello;
int r;
assert(b);
@@ -328,41 +323,38 @@ int bus_kernel_take_fd(sd_bus *b) {
b->use_memfd = 1;
+ zero(hello);
+ hello.size = sizeof(hello);
+ hello.conn_flags = b->hello_flags;
+ hello.pool_size = KDBUS_POOL_SIZE;
+
+ r = ioctl(b->input_fd, KDBUS_CMD_HELLO, &hello);
+ if (r < 0)
+ return -errno;
+
if (!b->kdbus_buffer) {
- b->kdbus_buffer = mmap(NULL, KDBUS_POOL_SIZE, PROT_READ|PROT_WRITE, MAP_ANONYMOUS|MAP_PRIVATE, -1, 0);
+ 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;
return -errno;
}
}
- hello->size = sizeof(h);
- hello->conn_flags = b->hello_flags;
-
- 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 = !!(hello->conn_flags & KDBUS_HELLO_ACCEPT_FD);
+ b->can_fds = !!(hello.conn_flags & KDBUS_HELLO_ACCEPT_FD);
r = bus_start_running(b);
if (r < 0)
@@ -408,12 +400,14 @@ int bus_kernel_write_message(sd_bus *bus, sd_bus_message *m) {
}
static void close_kdbus_msg(sd_bus *bus, struct kdbus_msg *k) {
+ uint64_t off;
struct kdbus_item *d;
assert(bus);
assert(k);
- ioctl(bus->input_fd, KDBUS_CMD_MSG_RELEASE, k);
+ off = (uint8_t *)k - (uint8_t *)bus->kdbus_buffer;
+ ioctl(bus->input_fd, KDBUS_CMD_MSG_RELEASE, &off);
KDBUS_ITEM_FOREACH(d, k) {
@@ -446,10 +440,10 @@ static int bus_kernel_make_message(sd_bus *bus, struct kdbus_msg *k, sd_bus_mess
l = d->size - offsetof(struct kdbus_item, data);
- if (d->type == KDBUS_MSG_PAYLOAD_VEC) {
+ if (d->type == KDBUS_MSG_PAYLOAD_OFF) {
if (!h) {
- h = UINT64_TO_PTR(d->vec.address);
+ h = (struct bus_header *)((uint8_t *)bus->kdbus_buffer + d->vec.offset);
if (!bus_header_is_complete(h, d->vec.size))
return -EBADMSG;
@@ -500,7 +494,7 @@ static int bus_kernel_make_message(sd_bus *bus, struct kdbus_msg *k, sd_bus_mess
l = d->size - offsetof(struct kdbus_item, data);
- if (d->type == KDBUS_MSG_PAYLOAD_VEC) {
+ if (d->type == KDBUS_MSG_PAYLOAD_OFF) {
size_t begin_body;
begin_body = BUS_MESSAGE_BODY_BEGIN(m);
@@ -516,15 +510,19 @@ static int bus_kernel_make_message(sd_bus *bus, struct kdbus_msg *k, sd_bus_mess
goto fail;
}
+ /* A -1 offset is NUL padding. */
+ part->is_zero = d->vec.offset == ~0ULL;
+
if (idx >= begin_body) {
- part->data = UINT64_TO_PTR(d->vec.address);
+ if (!part->is_zero)
+ part->data = (uint8_t *)bus->kdbus_buffer + d->vec.offset;
part->size = d->vec.size;
} else {
- part->data = d->vec.address != 0 ? (uint8_t*) UINT64_TO_PTR(d->vec.address) + (begin_body - idx) : NULL;
+ if (!part->is_zero)
+ part->data = (uint8_t *)bus->kdbus_buffer + d->vec.offset + (begin_body - idx);
part->size = d->vec.size - (begin_body - idx);
}
- part->is_zero = d->vec.address == 0;
part->sealed = true;
}
@@ -631,21 +629,21 @@ fail:
}
int bus_kernel_read_message(sd_bus *bus, sd_bus_message **m) {
- uint64_t addr;
+ uint64_t off;
struct kdbus_msg *k;
int r;
assert(bus);
assert(m);
- r = ioctl(bus->input_fd, KDBUS_CMD_MSG_RECV, &addr);
+ r = ioctl(bus->input_fd, KDBUS_CMD_MSG_RECV, &off);
if (r < 0) {
if (errno == EAGAIN)
return 0;
return -errno;
}
- k = UINT64_TO_PTR(addr);
+ k = (struct kdbus_msg *)((uint8_t *)bus->kdbus_buffer + off);
r = bus_kernel_make_message(bus, k, m);
if (r <= 0)
diff --git a/src/libsystemd-bus/bus-message.c b/src/libsystemd-bus/bus-message.c
index 6f2f3e9039..e6bf9db99a 100644
--- a/src/libsystemd-bus/bus-message.c
+++ b/src/libsystemd-bus/bus-message.c
@@ -125,8 +125,12 @@ static void message_free(sd_bus_message *m) {
if (m->free_kdbus)
free(m->kdbus);
- if (m->release_kdbus)
- ioctl(m->bus->input_fd, KDBUS_CMD_MSG_RELEASE, m->kdbus);
+ if (m->release_kdbus) {
+ uint64_t off;
+
+ off = (uint8_t *)m->kdbus - (uint8_t *)m->bus->kdbus_buffer;
+ ioctl(m->bus->input_fd, KDBUS_CMD_MSG_RELEASE, &off);
+ }
if (m->bus)
sd_bus_unref(m->bus);
diff --git a/src/libsystemd-bus/kdbus.h b/src/libsystemd-bus/kdbus.h
index dfc64ffe24..3b7783e1b1 100644
--- a/src/libsystemd-bus/kdbus.h
+++ b/src/libsystemd-bus/kdbus.h
@@ -73,8 +73,11 @@ struct kdbus_timestamp {
};
struct kdbus_vec {
- __u64 address;
__u64 size;
+ union {
+ __u64 address;
+ __u64 offset;
+ };
};
struct kdbus_memfd {
@@ -88,6 +91,7 @@ enum {
/* Filled in by userspace */
KDBUS_MSG_PAYLOAD_VEC, /* .data_vec, reference to memory area */
+ KDBUS_MSG_PAYLOAD_OFF, /* .data_vec, reference to memory area */
KDBUS_MSG_PAYLOAD_MEMFD, /* file descriptor of a special data file */
KDBUS_MSG_FDS, /* .data_fds of file descriptors */
KDBUS_MSG_BLOOM, /* for broadcasts, carries bloom filter blob in .data */
@@ -212,6 +216,7 @@ struct kdbus_policy_access {
__u64 id; /* uid, gid, 0 */
};
+//FIXME: convert access to access[]
struct kdbus_policy {
KDBUS_PART_HEADER;
union {
@@ -242,13 +247,6 @@ enum {
KDBUS_HELLO_ATTACH_AUDIT = 1 << 16,
};
-/* Items to append to struct kdbus_cmd_hello */
-enum {
- _KDBUS_HELLO_NULL,
- KDBUS_HELLO_POOL, /* kdbus_vec, userspace supplied pool to
- * place received messages */
-};
-
struct kdbus_cmd_hello {
__u64 size;
@@ -269,6 +267,7 @@ struct kdbus_cmd_hello {
__u64 id; /* id assigned to this connection */
__u64 bloom_size; /* The bloom filter size chosen by the
* bus owner */
+ __u64 pool_size; /* maximum size of pool buffer */
struct kdbus_item items[0];
};
@@ -284,7 +283,8 @@ enum {
_KDBUS_MAKE_NULL,
KDBUS_MAKE_NAME,
KDBUS_MAKE_CGROUP, /* the cgroup hierarchy ID for which to attach
- * cgroup membership paths * to messages. */
+ * cgroup membership paths to messages.
+ * FIXME: remove, use *the* hierarchy */
KDBUS_MAKE_CRED, /* allow translator services which connect
* to the bus on behalf of somebody else,
* allow specifiying the credentials of the
@@ -304,7 +304,6 @@ struct kdbus_cmd_bus_make {
* KDBUS_CMD_HELLO, later */
__u64 bloom_size; /* size of the bloom filter for this bus */
struct kdbus_item items[0];
-
};
struct kdbus_cmd_ep_make {
@@ -414,7 +413,7 @@ enum {
/* kdbus ep node commands: require connected state */
KDBUS_CMD_MSG_SEND = _IOWR(KDBUS_IOC_MAGIC, 0x40, struct kdbus_msg),
KDBUS_CMD_MSG_RECV = _IOWR(KDBUS_IOC_MAGIC, 0x41, __u64 *),
- KDBUS_CMD_MSG_RELEASE = _IOWR(KDBUS_IOC_MAGIC, 0x42, struct kdbus_msg),
+ KDBUS_CMD_MSG_RELEASE = _IOWR(KDBUS_IOC_MAGIC, 0x42, __u64 *),
KDBUS_CMD_NAME_ACQUIRE = _IOWR(KDBUS_IOC_MAGIC, 0x50, struct kdbus_cmd_name),
KDBUS_CMD_NAME_RELEASE = _IOWR(KDBUS_IOC_MAGIC, 0x51, struct kdbus_cmd_name),
generated by cgit v1.2.3-54-g00ecf (git 2.45.2) at 2024-11-24 07:04:51 +0000