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-rw-r--r--src/libsystemd-bus/bus-kernel.c80
-rw-r--r--src/libsystemd-bus/bus-message.c10
-rw-r--r--src/libsystemd-bus/test-bus-zero-copy.c6
3 files changed, 67 insertions, 29 deletions
diff --git a/src/libsystemd-bus/bus-kernel.c b/src/libsystemd-bus/bus-kernel.c
index a0e892a49f..f7759b6fb4 100644
--- a/src/libsystemd-bus/bus-kernel.c
+++ b/src/libsystemd-bus/bus-kernel.c
@@ -427,17 +427,17 @@ static void close_kdbus_msg(sd_bus *bus, struct kdbus_msg *k) {
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 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;
@@ -465,9 +465,15 @@ static int bus_kernel_make_message(sd_bus *bus, struct kdbus_msg *k, sd_bus_mess
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;
@@ -481,9 +487,7 @@ static int bus_kernel_make_message(sd_bus *bus, struct kdbus_msg *k, sd_bus_mess
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;
}
@@ -518,8 +522,8 @@ static int bus_kernel_make_message(sd_bus *bus, struct kdbus_msg *k, sd_bus_mess
part = message_append_part(m);
if (!part) {
- sd_bus_message_unref(m);
- return -ENOMEM;
+ r = -ENOMEM;
+ goto fail;
}
if (idx >= begin_body) {
@@ -535,6 +539,25 @@ static int bus_kernel_make_message(sd_bus *bus, struct kdbus_msg *k, sd_bus_mess
}
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;
@@ -562,17 +585,16 @@ static int bus_kernel_make_message(sd_bus *bus, struct kdbus_msg *k, sd_bus_mess
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);
}
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";
@@ -601,6 +623,21 @@ static int bus_kernel_make_message(sd_bus *bus, struct kdbus_msg *k, sd_bus_mess
*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) {
@@ -618,15 +655,6 @@ 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);
diff --git a/src/libsystemd-bus/bus-message.c b/src/libsystemd-bus/bus-message.c
index b5a311530b..209fd71c13 100644
--- a/src/libsystemd-bus/bus-message.c
+++ b/src/libsystemd-bus/bus-message.c
@@ -2196,6 +2196,13 @@ int bus_body_part_map(struct bus_body_part *part) {
if (part->size <= 0)
return 0;
+ /* For smaller zero parts (as used for padding) we don't need to map anything... */
+ if (part->memfd < 0 && part->is_zero && part->size < 8) {
+ static const uint8_t zeroes[7] = { };
+ part->data = (void*) zeroes;
+ return 0;
+ }
+
psz = PAGE_ALIGN(part->size);
if (part->memfd >= 0)
@@ -2222,9 +2229,6 @@ void bus_body_part_unmap(struct bus_body_part *part) {
if (part->memfd < 0)
return;
- if (!part->sealed)
- return;
-
if (!part->data)
return;
diff --git a/src/libsystemd-bus/test-bus-zero-copy.c b/src/libsystemd-bus/test-bus-zero-copy.c
index 0d8435ec1e..5a9f45489e 100644
--- a/src/libsystemd-bus/test-bus-zero-copy.c
+++ b/src/libsystemd-bus/test-bus-zero-copy.c
@@ -111,6 +111,12 @@ int main(int argc, char *argv[]) {
sd_bus_message_unref(m);
+ r = sd_bus_process(a, &m);
+ assert_se(r > 0);
+
+ bus_message_dump(m);
+ sd_bus_message_unref(m);
+
sd_bus_unref(a);
sd_bus_unref(b);
generated by cgit v1.2.3-54-g00ecf (git 2.45.2) at 2024-12-18 15:21:33 +0000