#include <fcntl.h>
#include <malloc.h>
+#include <sys/mman.h>
#include "util.h"
#define KDBUS_ITEM_HEADER_SIZE offsetof(struct kdbus_item, data)
#define KDBUS_ITEM_SIZE(s) ALIGN8((s) + KDBUS_ITEM_HEADER_SIZE)
+#define KDBUS_BUFFER_SIZE (4*1024*1024)
+
static int parse_unique_name(const char *s, uint64_t *id) {
int r;
*d = ALIGN8_PTR(*d);
(*d)->size = offsetof(struct kdbus_item, fds) + sizeof(int) * n_fds;
- (*d)->type = KDBUS_MSG_UNIX_FDS;
+ (*d)->type = KDBUS_MSG_FDS;
memcpy((*d)->fds, fds, sizeof(int) * n_fds);
*d = (struct kdbus_item *) ((uint8_t*) *d + (*d)->size);
}
int bus_kernel_take_fd(sd_bus *b) {
- struct kdbus_cmd_hello hello = {
- .conn_flags =
- KDBUS_HELLO_ACCEPT_FD|
- KDBUS_HELLO_ATTACH_COMM|
- KDBUS_HELLO_ATTACH_EXE|
- KDBUS_HELLO_ATTACH_CMDLINE|
- KDBUS_HELLO_ATTACH_CGROUP|
- KDBUS_HELLO_ATTACH_CAPS|
- KDBUS_HELLO_ATTACH_SECLABEL|
- KDBUS_HELLO_ATTACH_AUDIT
- };
+ 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;
+
int r;
assert(b);
if (b->is_server)
return -EINVAL;
- r = ioctl(b->input_fd, KDBUS_CMD_HELLO, &hello);
+ if (!b->kdbus_buffer) {
+ b->kdbus_buffer = mmap(NULL, KDBUS_BUFFER_SIZE, PROT_READ|PROT_WRITE, MAP_ANONYMOUS|MAP_PRIVATE, -1, 0);
+ if (b->kdbus_buffer == MAP_FAILED) {
+ b->kdbus_buffer = NULL;
+ return -errno;
+ }
+ }
+
+ hello->size = sizeof(h);
+ hello->conn_flags =
+ KDBUS_HELLO_ACCEPT_FD|
+ KDBUS_HELLO_ATTACH_COMM|
+ KDBUS_HELLO_ATTACH_EXE|
+ KDBUS_HELLO_ATTACH_CMDLINE|
+ KDBUS_HELLO_ATTACH_CGROUP|
+ KDBUS_HELLO_ATTACH_CAPS|
+ KDBUS_HELLO_ATTACH_SECLABEL|
+ KDBUS_HELLO_ATTACH_AUDIT;
+
+ hello->items[0].type = KDBUS_HELLO_BUFFER;
+ 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_BUFFER_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;
return 1;
}
-static void close_kdbus_msg(struct kdbus_msg *k) {
+static void close_kdbus_msg(sd_bus *bus, struct kdbus_msg *k) {
struct kdbus_item *d;
+ assert(bus);
+ assert(k);
+
+ ioctl(bus->input_fd, KDBUS_CMD_MSG_RELEASE, k);
+
KDBUS_ITEM_FOREACH(d, k) {
- if (d->type != KDBUS_MSG_UNIX_FDS)
+ if (d->type != KDBUS_MSG_FDS)
continue;
close_many(d->fds, (d->size - offsetof(struct kdbus_item, fds)) / sizeof(int));
}
}
+static bool range_contains(size_t astart, size_t asize, size_t bstart, size_t bsize, void *a, void **b) {
+
+ if (bstart < astart)
+ return false;
+
+ if (bstart + bsize > astart + asize)
+ return false;
+
+ *b = (uint8_t*) a + (bstart - astart);
+
+ return true;
+}
+
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;
l = d->size - offsetof(struct kdbus_item, data);
- if (d->type == KDBUS_MSG_PAYLOAD) {
+ if (d->type == KDBUS_MSG_PAYLOAD_VEC) {
if (!h) {
- if (l < sizeof(struct bus_header))
+ if (d->vec.size < sizeof(struct bus_header))
return -EBADMSG;
- h = (struct bus_header*) d->data;
+ h = (struct bus_header*) d->vec.address;
}
n_payload++;
- n_bytes += l;
+ n_bytes += d->vec.size;
- } else if (d->type == KDBUS_MSG_UNIX_FDS) {
+ } else if (d->type == KDBUS_MSG_FDS) {
int *f;
unsigned j;
if (n_bytes != total)
return -EBADMSG;
+ if (n_payload > 2)
+ return -EBADMSG;
+
r = bus_message_from_header(h, sizeof(struct bus_header), fds, n_fds, NULL, seclabel, 0, &m);
if (r < 0)
return r;
l = d->size - offsetof(struct kdbus_item, data);
- if (d->type == KDBUS_MSG_PAYLOAD) {
-
- if (idx == sizeof(struct bus_header) &&
- l == ALIGN8(BUS_MESSAGE_FIELDS_SIZE(m)))
- m->fields = d->data;
- else if (idx == sizeof(struct bus_header) + ALIGN8(BUS_MESSAGE_FIELDS_SIZE(m)) &&
- l == BUS_MESSAGE_BODY_SIZE(m))
- m->body = d->data;
- else if (!(idx == 0 && l == sizeof(struct bus_header))) {
- sd_bus_message_unref(m);
- return -EBADMSG;
- }
+ if (d->type == KDBUS_MSG_PAYLOAD_VEC) {
+
+ range_contains(idx, d->vec.size, ALIGN8(sizeof(struct bus_header)), BUS_MESSAGE_FIELDS_SIZE(m), (void*) d->vec.address, &m->fields);
+ range_contains(idx, d->vec.size, ALIGN8(sizeof(struct bus_header)) + ALIGN8(BUS_MESSAGE_FIELDS_SIZE(m)), BUS_MESSAGE_BODY_SIZE(m), (void*) d->vec.address, &m->body);
+
+ idx += d->vec.size;
- idx += l;
} else if (d->type == KDBUS_MSG_SRC_CREDS) {
m->pid_starttime = d->creds.starttime / NSEC_PER_USEC;
m->uid = d->creds.uid;
else if (d->type == KDBUS_MSG_SRC_CAPS) {
m->capability = d->data;
m->capability_size = l;
- } else
+ } else if (d->type != KDBUS_MSG_FDS &&
+ d->type != KDBUS_MSG_DST_NAME &&
+ d->type != KDBUS_MSG_SRC_SECLABEL)
log_debug("Got unknown field from kernel %llu", d->type);
}
+ if ((BUS_MESSAGE_FIELDS_SIZE(m) > 0 && !m->fields) ||
+ (BUS_MESSAGE_BODY_SIZE(m) > 0 && !m->body)) {
+ sd_bus_message_unref(m);
+ return -EBADMSG;
+ }
+
r = bus_message_parse_fields(m);
if (r < 0) {
sd_bus_message_unref(m);
/* We take possession of the kmsg struct now */
m->kdbus = k;
- m->free_kdbus = true;
+ m->bus = sd_bus_ref(bus);
+ m->release_kdbus = true;
m->free_fds = true;
fds = NULL;
int bus_kernel_read_message(sd_bus *bus, sd_bus_message **m) {
struct kdbus_msg *k;
- size_t sz = 1024;
int r;
assert(bus);
assert(m);
- for (;;) {
- void *q;
-
- q = memalign(8, sz);
- if (!q)
- return -errno;
-
- free(bus->rbuffer);
- k = bus->rbuffer = q;
- k->size = sz;
-
- /* 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 = ioctl(bus->input_fd, KDBUS_CMD_MSG_RECV, bus->rbuffer);
- if (r >= 0)
- break;
-
+ r = ioctl(bus->input_fd, KDBUS_CMD_MSG_RECV, &k);
+ if (r < 0) {
if (errno == EAGAIN)
return 0;
- if (errno != ENOBUFS)
- return -errno;
-
- sz *= 2;
+ 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)
- bus->rbuffer = NULL;
- else
- close_kdbus_msg(k);
+ if (r <= 0)
+ close_kdbus_msg(bus, k);
return r < 0 ? r : 1;
}
KDBUS_MSG_NULL,
/* Filled in by userspace */
- KDBUS_MSG_PAYLOAD, /* .data, inline memory */
KDBUS_MSG_PAYLOAD_VEC, /* .data_vec, reference to memory area */
- KDBUS_MSG_UNIX_FDS, /* .data_fds of file descriptors */
+ 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 */
KDBUS_MSG_DST_NAME, /* destination's well-known name, in .str */
+ KDBUS_MSG_PRIORITY, /* queue priority for message */
/* Filled in by kernelspace */
- KDBUS_MSG_SRC_NAMES = 0x200,/* NUL separated string list with well-known names of source */
+ KDBUS_MSG_SRC_NAMES = 0x400,/* NUL separated string list with well-known names of source */
KDBUS_MSG_TIMESTAMP, /* .timestamp */
KDBUS_MSG_SRC_CREDS, /* .creds */
KDBUS_MSG_SRC_PID_COMM, /* optional, in .str */
KDBUS_MSG_SRC_AUDIT, /* .audit */
/* Special messages from kernel, consisting of one and only one of these data blocks */
- KDBUS_MSG_NAME_ADD = 0x400,/* .name_change */
+ KDBUS_MSG_NAME_ADD = 0x800,/* .name_change */
KDBUS_MSG_NAME_REMOVE, /* .name_change */
KDBUS_MSG_NAME_CHANGE, /* .name_change */
KDBUS_MSG_ID_ADD, /* .id_change */
KDBUS_MSG_REPLY_DEAD, /* dito */
};
-enum {
- KDBUS_VEC_ALIGNED = 1 << 0,
-};
-
struct kdbus_vec {
__u64 address;
__u64 size;
- __u64 flags;
+};
+
+struct kdbus_memfd {
+ __u64 size;
+ int fd;
};
/**
struct kdbus_timestamp timestamp;
/* specific fields */
+ int fd;
int fds[0];
struct kdbus_manager_msg_name_change name_change;
struct kdbus_manager_msg_id_change id_change;
/* Items to append to struct kdbus_cmd_hello */
enum {
KDBUS_HELLO_NULL,
+ KDBUS_HELLO_BUFFER, /* kdbus_vec, userspace supplied buffer to
+ * place received messages */
};
struct kdbus_cmd_hello {
* cgroup membership paths * to messages. */
KDBUS_MAKE_CRED, /* allow translator services which connect
* to the bus on behalf of somebody else,
- * allow specifying the credentials of the
+ * allow specifiying the credentials of the
* client to connect on behalf on. Needs
* privileges */
};
/* 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, struct kdbus_msg),
+ KDBUS_CMD_MSG_RECV = _IOWR(KDBUS_IOC_MAGIC, 0x41, struct kdbus_msg *),
+ KDBUS_CMD_MSG_RELEASE = _IOWR(KDBUS_IOC_MAGIC, 0x42, struct kdbus_msg),
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),
/* kdbus ep node commands: require ep owner state */
KDBUS_CMD_EP_POLICY_SET = _IOWR(KDBUS_IOC_MAGIC, 0x70, struct kdbus_cmd_policy),
+
+ /* kdbus ep node commands: */
+ KDBUS_CMD_MEMFD_NEW = _IOWR(KDBUS_IOC_MAGIC, 0x80, int *),
+
+ /* kdbus memfd commands: */
+ KDBUS_CMD_MEMFD_SIZE_GET = _IOWR(KDBUS_IOC_MAGIC, 0x81, __u64 *),
+ KDBUS_CMD_MEMFD_SEAL_GET = _IOWR(KDBUS_IOC_MAGIC, 0x82, int *),
+ KDBUS_CMD_MEMFD_SEAL_SET = _IOWR(KDBUS_IOC_MAGIC, 0x83, int),
};
#endif
~ianmdlvl / elogind.git / commitdiff