diff options
Diffstat (limited to 'src/libsystemd-bus/bus-kernel.c')
| -rw-r--r-- | src/libsystemd-bus/bus-kernel.c | 66 |
1 files changed, 32 insertions, 34 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) |