Fix: kernel tracing: flush after stop

[lttng-tools.git] / src / bin / lttng-sessiond / cmd.c

diff --git a/src/bin/lttng-sessiond/cmd.c b/src/bin/lttng-sessiond/cmd.c
index d443d7926b7d9c25fc1b3dcdcbb8b1ced0bc97a4..cc26e6dae004baeab4177f3589a0e837e7deba34 100644 (file)
--- a/src/bin/lttng-sessiond/cmd.c
+++ b/src/bin/lttng-sessiond/cmd.c
@@ -277,7 +277,10 @@ static void list_lttng_channels(enum lttng_domain_type domain,
                                &iter.iter, uchan, node.node) {
                        uint64_t discarded_events = 0, lost_packets = 0;
 
-                       strncpy(channels[i].name, uchan->name, LTTNG_SYMBOL_NAME_LEN);
+                       if (lttng_strncpy(channels[i].name, uchan->name,
+                                       LTTNG_SYMBOL_NAME_LEN)) {
+                               break;
+                       }
                        channels[i].attr.overwrite = uchan->attr.overwrite;
                        channels[i].attr.subbuf_size = uchan->attr.subbuf_size;
                        channels[i].attr.num_subbuf = uchan->attr.num_subbuf;
@@ -758,12 +761,15 @@ static int add_uri_to_consumer(struct consumer_output *consumer,
                DBG2("Setting trace directory path from URI to %s", uri->dst.path);
                memset(consumer->dst.trace_path, 0,
                                sizeof(consumer->dst.trace_path));
-               strncpy(consumer->dst.trace_path, uri->dst.path,
-                               sizeof(consumer->dst.trace_path));
+               /* Explicit length checks for strcpy and strcat. */
+               if (strlen(uri->dst.path) + strlen(default_trace_dir)
+                               >= sizeof(consumer->dst.trace_path)) {
+                       ret = LTTNG_ERR_FATAL;
+                       goto error;
+               }
+               strcpy(consumer->dst.trace_path, uri->dst.path);
                /* Append default trace dir */
-               strncat(consumer->dst.trace_path, default_trace_dir,
-                               sizeof(consumer->dst.trace_path) -
-                               strlen(consumer->dst.trace_path) - 1);
+               strcat(consumer->dst.trace_path, default_trace_dir);
                /* Flag consumer as local. */
                consumer->type = CONSUMER_DST_LOCAL;
                break;
@@ -2441,7 +2447,15 @@ int cmd_stop_trace(struct ltt_session *session)
        if (ksession && ksession->active) {
                DBG("Stop kernel tracing");
 
-               /* Flush metadata if exist */
+               ret = kernel_stop_session(ksession);
+               if (ret < 0) {
+                       ret = LTTNG_ERR_KERN_STOP_FAIL;
+                       goto error;
+               }
+
+               kernel_wait_quiescent(kernel_tracer_fd);
+
+               /* Flush metadata after stopping (if exists) */
                if (ksession->metadata_stream_fd >= 0) {
                        ret = kernel_metadata_flush_buffer(ksession->metadata_stream_fd);
                        if (ret < 0) {
@@ -2449,7 +2463,7 @@ int cmd_stop_trace(struct ltt_session *session)
                        }
                }
 
-               /* Flush all buffers before stopping */
+               /* Flush all buffers after stopping */
                cds_list_for_each_entry(kchan, &ksession->channel_list.head, list) {
                        ret = kernel_flush_buffer(kchan);
                        if (ret < 0) {
@@ -2457,14 +2471,6 @@ int cmd_stop_trace(struct ltt_session *session)
                        }
                }
 
-               ret = kernel_stop_session(ksession);
-               if (ret < 0) {
-                       ret = LTTNG_ERR_KERN_STOP_FAIL;
-                       goto error;
-               }
-
-               kernel_wait_quiescent(kernel_tracer_fd);
-
                ksession->active = 0;
        }
 
@@ -3353,10 +3359,18 @@ ssize_t cmd_snapshot_list_outputs(struct ltt_session *session,
                assert(output->consumer);
                list[idx].id = output->id;
                list[idx].max_size = output->max_size;
-               strncpy(list[idx].name, output->name, sizeof(list[idx].name));
+               if (lttng_strncpy(list[idx].name, output->name,
+                               sizeof(list[idx].name))) {
+                       ret = -LTTNG_ERR_INVALID;
+                       goto error;
+               }
                if (output->consumer->type == CONSUMER_DST_LOCAL) {
-                       strncpy(list[idx].ctrl_url, output->consumer->dst.trace_path,
-                                       sizeof(list[idx].ctrl_url));
+                       if (lttng_strncpy(list[idx].ctrl_url,
+                                       output->consumer->dst.trace_path,
+                                       sizeof(list[idx].ctrl_url))) {
+                               ret = -LTTNG_ERR_INVALID;
+                               goto error;
+                       }
                } else {
                        /* Control URI. */
                        ret = uri_to_str_url(&output->consumer->dst.net.control,
@@ -3892,8 +3906,12 @@ int cmd_snapshot_record(struct ltt_session *session,
 
                        /* Use temporary name. */
                        if (*output->name != '\0') {
-                               strncpy(tmp_output.name, output->name,
-                                               sizeof(tmp_output.name));
+                               if (lttng_strncpy(tmp_output.name, output->name,
+                                               sizeof(tmp_output.name))) {
+                                       ret = LTTNG_ERR_INVALID;
+                                       rcu_read_unlock();
+                                       goto error;
+                               }
                        }
 
                        tmp_output.nb_snapshot = session->snapshot.nb_snapshot;