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bus: it's OK to send messages with an empty payload but non-empty signature
[elogind.git]
/
src
/
libsystemd-bus
/
bus-kernel.c
diff --git
a/src/libsystemd-bus/bus-kernel.c
b/src/libsystemd-bus/bus-kernel.c
index a3afb2eba68fb0bb21a40e96e273207b32c1a23f..d0a9fbc3fb9af7476e65275ac910c17188900ed6 100644
(file)
--- a/
src/libsystemd-bus/bus-kernel.c
+++ b/
src/libsystemd-bus/bus-kernel.c
@@
-362,6
+362,7
@@
int bus_kernel_take_fd(sd_bus *b) {
b->is_kernel = true;
b->bus_client = true;
b->can_fds = !!(hello.conn_flags & KDBUS_HELLO_ACCEPT_FD);
b->is_kernel = true;
b->bus_client = true;
b->can_fds = !!(hello.conn_flags & KDBUS_HELLO_ACCEPT_FD);
+ b->message_version = 2;
/* the kernel told us the UUID of the underlying bus */
memcpy(b->server_id.bytes, hello.id128, sizeof(b->server_id.bytes));
/* the kernel told us the UUID of the underlying bus */
memcpy(b->server_id.bytes, hello.id128, sizeof(b->server_id.bytes));
@@
-676,6
+677,12
@@
static int bus_kernel_make_message(sd_bus *bus, struct kdbus_msg *k) {
if (n_bytes != total)
return -EBADMSG;
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;
r = bus_message_from_header(bus, h, sizeof(struct bus_header), fds, n_fds, NULL, seclabel, 0, &m);
if (r < 0)
return r;
@@
-885,9
+892,16
@@
int bus_kernel_read_message(sd_bus *bus) {
}
k = (struct kdbus_msg *)((uint8_t *)bus->kdbus_buffer + off);
}
k = (struct kdbus_msg *)((uint8_t *)bus->kdbus_buffer + off);
- if (k->payload_type == KDBUS_PAYLOAD_DBUS)
+ if (k->payload_type == KDBUS_PAYLOAD_DBUS)
{
r = bus_kernel_make_message(bus, k);
r = bus_kernel_make_message(bus, k);
- else if (k->payload_type == KDBUS_PAYLOAD_KERNEL)
+
+ /* Anybody can send us invalid messages, let's just drop them. */
+ if (r == -EBADMSG || r == -EPROTOTYPE) {
+ log_error("Ignoring invalid message: %s", strerror(-r));
+ r = 0;
+ }
+
+ } else if (k->payload_type == KDBUS_PAYLOAD_KERNEL)
r = bus_kernel_translate_message(bus, k);
else
r = 0;
r = bus_kernel_translate_message(bus, k);
else
r = 0;