From: Philippe Proulx <eeppeliteloop@gmail.com>
Date: Wed, 26 Aug 2015 05:24:02 +0000 (-0400)
Subject: Disallow duplicate event exclusion names
X-Git-Tag: v2.8.0-rc1~232
X-Git-Url: https://git.lttng.org/?p=lttng-tools.git;a=commitdiff_plain;h=ad11a1d34b25fced1b5bcb0494016d3041d9bb8b

Disallow duplicate event exclusion names

This patch makes the session daemon disallow event
exclusion names sharing the same name when creating an
UST event, e.g.:

    lttng enable-event -u -a a,b,c,d  ->  allowed
    lttng enable-event -u -a a,b,a,d  ->  disallowed

Signed-off-by: Philippe Proulx <eeppeliteloop@gmail.com>
Signed-off-by: Jérémie Galarneau <jeremie.galarneau@efficios.com>
---

diff --git a/src/bin/lttng-sessiond/trace-ust.c b/src/bin/lttng-sessiond/trace-ust.c
index 178c7d04e..4b7363f9f 100644
--- a/src/bin/lttng-sessiond/trace-ust.c
+++ b/src/bin/lttng-sessiond/trace-ust.c
@@ -359,6 +359,39 @@ error:
 	return luc;
 }
 
+/*
+ * Validates an exclusion list.
+ *
+ * Returns 0 if valid, negative value if invalid.
+ */
+static int validate_exclusion(struct lttng_event_exclusion *exclusion)
+{
+	size_t i;
+	int ret = 0;
+
+	assert(exclusion);
+
+	for (i = 0; i < exclusion->count; ++i) {
+		size_t j;
+		const char *name_a =
+			LTTNG_EVENT_EXCLUSION_NAME_AT(exclusion, i);
+
+		for (j = 0; j < i; ++j) {
+			const char *name_b =
+				LTTNG_EVENT_EXCLUSION_NAME_AT(exclusion, j);
+
+			if (!strncmp(name_a, name_b, LTTNG_SYMBOL_NAME_LEN)) {
+				/* Match! */
+				ret = -1;
+				goto end;
+			}
+		}
+	}
+
+end:
+	return ret;
+}
+
 /*
  * Allocate and initialize a ust event. Set name and event type.
  * We own filter_expression, filter, and exclusion.
@@ -375,6 +408,10 @@ struct ltt_ust_event *trace_ust_create_event(struct lttng_event *ev,
 
 	assert(ev);
 
+	if (exclusion && validate_exclusion(exclusion)) {
+		goto error;
+	}
+
 	lue = zmalloc(sizeof(struct ltt_ust_event));
 	if (lue == NULL) {
 		PERROR("ust event zmalloc");