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Diffstat (limited to 'src/libsystemd-bus/bus-kernel.c')
-rw-r--r--src/libsystemd-bus/bus-kernel.c168
1 files changed, 98 insertions, 70 deletions
diff --git a/src/libsystemd-bus/bus-kernel.c b/src/libsystemd-bus/bus-kernel.c
index 0762b7836f..aecf408645 100644
--- a/src/libsystemd-bus/bus-kernel.c
+++ b/src/libsystemd-bus/bus-kernel.c
@@ -25,6 +25,7 @@
#include <fcntl.h>
#include <malloc.h>
+#include <sys/mman.h>
#include "util.h"
@@ -44,6 +45,8 @@
#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;
@@ -111,7 +114,7 @@ static void append_fds(struct kdbus_item **d, const int fds[], unsigned n_fds) {
*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);
@@ -275,17 +278,12 @@ static int bus_message_setup_kmsg(sd_bus *b, sd_bus_message *m) {
}
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);
@@ -293,20 +291,44 @@ int bus_kernel_take_fd(sd_bus *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;
@@ -356,18 +378,36 @@ int bus_kernel_write_message(sd_bus *bus, sd_bus_message *m) {
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;
@@ -390,19 +430,19 @@ 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) {
+ 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;
@@ -431,6 +471,9 @@ static int bus_kernel_make_message(sd_bus *bus, struct kdbus_msg *k, sd_bus_mess
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;
@@ -440,20 +483,13 @@ 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) {
-
- 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;
@@ -480,10 +516,18 @@ 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
+ } 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);
@@ -509,7 +553,8 @@ static int bus_kernel_make_message(sd_bus *bus, struct kdbus_msg *k, sd_bus_mess
/* 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;
@@ -520,48 +565,31 @@ static int bus_kernel_make_message(sd_bus *bus, struct kdbus_msg *k, sd_bus_mess
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;
}
generated by cgit v1.2.3-54-g00ecf (git 2.45.2) at 2024-07-23 22:47:38 +0000