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-rw-r--r--src/libsystemd/bus-kernel.c7
-rw-r--r--src/libsystemd/kdbus.h55
-rw-r--r--src/libsystemd/sd-memfd.c12
3 files changed, 53 insertions, 21 deletions
diff --git a/src/libsystemd/bus-kernel.c b/src/libsystemd/bus-kernel.c
index e8f4c58110..d69d6f3bc4 100644
--- a/src/libsystemd/bus-kernel.c
+++ b/src/libsystemd/bus-kernel.c
@@ -1000,18 +1000,21 @@ int bus_kernel_pop_memfd(sd_bus *bus, void **address, size_t *mapped, size_t *al
assert_se(pthread_mutex_lock(&bus->memfd_cache_mutex) >= 0);
if (bus->n_memfd_cache <= 0) {
+ struct kdbus_cmd_memfd_make cmd = {
+ .size = sizeof(struct kdbus_cmd_memfd_make),
+ };
int r;
assert_se(pthread_mutex_unlock(&bus->memfd_cache_mutex) >= 0);
- r = ioctl(bus->input_fd, KDBUS_CMD_MEMFD_NEW, &fd);
+ r = ioctl(bus->input_fd, KDBUS_CMD_MEMFD_NEW, &cmd);
if (r < 0)
return -errno;
*address = NULL;
*mapped = 0;
*allocated = 0;
- return fd;
+ return cmd.fd;
}
c = &bus->memfd_cache[--bus->n_memfd_cache];
diff --git a/src/libsystemd/kdbus.h b/src/libsystemd/kdbus.h
index 601d0188d3..d2e4fd301b 100644
--- a/src/libsystemd/kdbus.h
+++ b/src/libsystemd/kdbus.h
@@ -137,7 +137,7 @@ struct kdbus_vec {
* struct kdbus_memfd - a kdbus memfd
* @size: The memfd's size
* @fd: The file descriptor number
- * @__pad: Padding to make the struct aligned
+ * @__pad: Padding to ensure proper alignement and size
*
* Attached to:
* KDBUS_ITEM_PAYLOAD_MEMFD
@@ -205,6 +205,7 @@ struct kdbus_policy {
* @KDBUS_ITEM_BLOOM_SIZE: Desired bloom size, used by KDBUS_CMD_BUS_MAKE
* @KDBUS_ITEM_DST_NAME: Destination's well-known name
* @KDBUS_ITEM_MAKE_NAME: Name of namespace, bus, endpoint
+ * @KDBUS_ITEM_MEMFD_NAME: The human readable name of a memfd (debugging)
* @_KDBUS_ITEM_POLICY_BASE: Start of policy items
* @KDBUS_ITEM_POLICY_NAME: Policy in struct kdbus_policy
* @KDBUS_ITEM_POLICY_ACCESS: Policy in struct kdbus_policy
@@ -221,6 +222,7 @@ struct kdbus_policy {
* @KDBUS_ITEM_CAPS: The process capabilities
* @KDBUS_ITEM_SECLABEL: The security label
* @KDBUS_ITEM_AUDIT: The audit IDs
+ * @KDBUS_ITEM_CONN_NAME: The connection's human-readable name (debugging)
* @_KDBUS_ITEM_KERNEL_BASE: Start of kernel-generated message items
* @KDBUS_ITEM_NAME_ADD: Notify in struct kdbus_notify_name_change
* @KDBUS_ITEM_NAME_REMOVE: Notify in struct kdbus_notify_name_change
@@ -241,12 +243,13 @@ enum kdbus_item_type {
KDBUS_ITEM_BLOOM_SIZE,
KDBUS_ITEM_DST_NAME,
KDBUS_ITEM_MAKE_NAME,
+ KDBUS_ITEM_MEMFD_NAME,
- _KDBUS_ITEM_POLICY_BASE = 0x400,
+ _KDBUS_ITEM_POLICY_BASE = 0x1000,
KDBUS_ITEM_POLICY_NAME = _KDBUS_ITEM_POLICY_BASE,
KDBUS_ITEM_POLICY_ACCESS,
- _KDBUS_ITEM_ATTACH_BASE = 0x600,
+ _KDBUS_ITEM_ATTACH_BASE = 0x2000,
KDBUS_ITEM_NAME = _KDBUS_ITEM_ATTACH_BASE,
KDBUS_ITEM_ID,
KDBUS_ITEM_TIMESTAMP,
@@ -259,8 +262,9 @@ enum kdbus_item_type {
KDBUS_ITEM_CAPS,
KDBUS_ITEM_SECLABEL,
KDBUS_ITEM_AUDIT,
+ KDBUS_ITEM_CONN_NAME,
- _KDBUS_ITEM_KERNEL_BASE = 0x800,
+ _KDBUS_ITEM_KERNEL_BASE = 0x3000,
KDBUS_ITEM_NAME_ADD = _KDBUS_ITEM_KERNEL_BASE,
KDBUS_ITEM_NAME_REMOVE,
KDBUS_ITEM_NAME_CHANGE,
@@ -350,13 +354,13 @@ enum kdbus_payload_type {
* @payload_type: Payload type (KDBUS_PAYLOAD_*)
* @cookie: Userspace-supplied cookie, for the connection
* to identify its messages
- * @cookie_reply: A reply to the requesting message with the same
- * cookie. The requesting connection can match its
- * request and the reply with this value
* @timeout_ns: The time to wait for a message reply from the peer.
* If there is no reply, a kernel-generated message
* with an attached KDBUS_ITEM_REPLY_TIMEOUT item
* is sent to @src_id.
+ * @cookie_reply: A reply to the requesting message with the same
+ * cookie. The requesting connection can match its
+ * request and the reply with this value
* @items: A list of kdbus_items containing the message payload
*/
struct kdbus_msg {
@@ -367,8 +371,8 @@ struct kdbus_msg {
__u64 payload_type;
__u64 cookie;
union {
- __u64 cookie_reply;
__u64 timeout_ns;
+ __u64 cookie_reply;
};
struct kdbus_item items[0];
} __attribute__((aligned(8)));
@@ -441,6 +445,7 @@ enum kdbus_hello_flags {
* @KDBUS_ATTACH_CAPS: The process capabilities
* @KDBUS_ATTACH_SECLABEL: The security label
* @KDBUS_ATTACH_AUDIT: The audit IDs
+ * @KDBUS_ATTACH_CONN_NAME: The human-readable connection name
*/
enum kdbus_attach_flags {
KDBUS_ATTACH_TIMESTAMP = 1 << 0,
@@ -453,6 +458,7 @@ enum kdbus_attach_flags {
KDBUS_ATTACH_CAPS = 1 << 7,
KDBUS_ATTACH_SECLABEL = 1 << 8,
KDBUS_ATTACH_AUDIT = 1 << 9,
+ KDBUS_ATTACH_CONN_NAME = 1 << 10,
};
/**
@@ -650,6 +656,24 @@ struct kdbus_cmd_match {
} __attribute__((aligned(8)));
/**
+ * struct kdbus_cmd_memfd_make - create a kdbus memfd
+ * @size: The total size of the struct
+ * @file_size: The initial file size
+ * @fd: The returned file descriptor number
+ * @__pad: Padding to ensure proper alignement
+ * @items: A list of items for additional information
+ *
+ * This structure is used with the KDBUS_CMD_MEMFD_NEW ioctl.
+ */
+struct kdbus_cmd_memfd_make {
+ __u64 size;
+ __u64 file_size;
+ int fd;
+ __u32 __pad;
+ struct kdbus_item items[0];
+} __attribute__((aligned(8)));
+
+/**
* enum kdbus_ioctl_type - Ioctl API
* @KDBUS_CMD_BUS_MAKE: After opening the "control" device node, this
* command creates a new bus with the specified
@@ -678,8 +702,9 @@ struct kdbus_cmd_match {
* pool.
* @KDBUS_CMD_DROP: Drop and free the next queued message and all
* its ressources without actually receiveing it.
- * @KDBUS_CMD_SRC: Return the sender's connection ID of the next
- * queued message.
+ * @KDBUS_CMD_SRC: Query the sender's connection ID of the next
+ * queued message, used to determine the activating
+ * connection of a bus name.
* @KDBUS_CMD_NAME_ACQUIRE: Request a well-known bus name to associate with
* the connection. Well-known names are used to
* address a peer on the bus.
@@ -750,11 +775,11 @@ enum kdbus_ioctl_type {
KDBUS_CMD_EP_POLICY_SET = _IOW (KDBUS_IOC_MAGIC, 0x80, struct kdbus_cmd_policy),
- KDBUS_CMD_MEMFD_NEW = _IOR (KDBUS_IOC_MAGIC, 0x90, int *),
- KDBUS_CMD_MEMFD_SIZE_GET = _IOR (KDBUS_IOC_MAGIC, 0x91, __u64 *),
- KDBUS_CMD_MEMFD_SIZE_SET = _IOW (KDBUS_IOC_MAGIC, 0x92, __u64 *),
- KDBUS_CMD_MEMFD_SEAL_GET = _IOR (KDBUS_IOC_MAGIC, 0x93, int *),
- KDBUS_CMD_MEMFD_SEAL_SET = _IO (KDBUS_IOC_MAGIC, 0x94),
+ KDBUS_CMD_MEMFD_NEW = _IOWR(KDBUS_IOC_MAGIC, 0xc0, struct kdbus_cmd_memfd_make),
+ KDBUS_CMD_MEMFD_SIZE_GET = _IOR (KDBUS_IOC_MAGIC, 0xc1, __u64 *),
+ KDBUS_CMD_MEMFD_SIZE_SET = _IOW (KDBUS_IOC_MAGIC, 0xc2, __u64 *),
+ KDBUS_CMD_MEMFD_SEAL_GET = _IOR (KDBUS_IOC_MAGIC, 0xc3, int *),
+ KDBUS_CMD_MEMFD_SEAL_SET = _IO (KDBUS_IOC_MAGIC, 0xc4),
};
/*
diff --git a/src/libsystemd/sd-memfd.c b/src/libsystemd/sd-memfd.c
index cd95978ac2..112c95fb43 100644
--- a/src/libsystemd/sd-memfd.c
+++ b/src/libsystemd/sd-memfd.c
@@ -35,9 +35,11 @@ struct sd_memfd {
};
_public_ int sd_memfd_new(sd_memfd **m) {
+ struct kdbus_cmd_memfd_make cmd = {
+ .size = sizeof(struct kdbus_cmd_memfd_make),
+ };
_cleanup_close_ int kdbus = -1;
sd_memfd *n;
- int fd;
assert_return(m, -EINVAL);
@@ -45,14 +47,16 @@ _public_ int sd_memfd_new(sd_memfd **m) {
if (kdbus < 0)
return -errno;
- if (ioctl(kdbus, KDBUS_CMD_MEMFD_NEW, &fd) < 0)
+ if (ioctl(kdbus, KDBUS_CMD_MEMFD_NEW, &cmd) < 0)
return -errno;
n = new0(struct sd_memfd, 1);
- if (!n)
+ if (!n) {
+ close_nointr_nofail(cmd.fd);
return -ENOMEM;
+ }
- n->fd = fd;
+ n->fd = cmd.fd;
*m = n;
return 0;
}
generated by cgit v1.2.3-54-g00ecf (git 2.45.2) at 2024-12-23 20:16:27 +0000