X-Git-Url: https://git.lttng.org/?a=blobdiff_plain;f=src%2Fbin%2Flttng-sessiond%2Fsyscall.c;h=7ae6682bb419c06c6cdd8231c5c92d0dbef475c4;hb=234cd6367843a2106a4cb10f8fb99443208516df;hp=95d30d07459dc98d12dfb2ca680f1773cdac7c52;hpb=834978fd9e2392f20867351ca99bf7bdf31b4f56;p=lttng-tools.git

diff --git a/src/bin/lttng-sessiond/syscall.c b/src/bin/lttng-sessiond/syscall.c
index 95d30d074..7ae6682bb 100644
--- a/src/bin/lttng-sessiond/syscall.c
+++ b/src/bin/lttng-sessiond/syscall.c
@@ -15,7 +15,7 @@
  * Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
  */
 
-#define _GNU_SOURCE
+#define _LGPL_SOURCE
 #include <common/bitfield.h>
 #include <common/common.h>
 #include <common/kernel-ctl/kernel-ctl.h>
@@ -35,7 +35,7 @@ static size_t syscall_table_nb_entry;
  * Populate the system call table using the kernel tracer.
  *
  * Return 0 on success and the syscall table is allocated. On error, a negative
- * value is returned and the syscall table is set to NULL.
+ * value is returned.
  */
 int syscall_init_table(void)
 {
@@ -72,7 +72,7 @@ int syscall_init_table(void)
 	}
 
 	while (fscanf(fp,
-				"syscall { index = %lu; \
+				"syscall { index = %zu; \
 				name = %" XSTR(SYSCALL_NAME_LEN) "[^;]; \
 				bitness = %u; };\n",
 				&index, name, &bitness) == 3) {
@@ -81,7 +81,15 @@ int syscall_init_table(void)
 			size_t new_nbmem;
 
 			/* Double memory size. */
-			new_nbmem = index << 1;
+			new_nbmem = max(index, nbmem << 1);
+			if (new_nbmem < nbmem) {
+				/* Overflow, stop everything, something went really wrong. */
+				ERR("Syscall listing memory size overflow. Stopping");
+				free(syscall_table);
+				syscall_table = NULL;
+				ret = -EINVAL;
+				goto error;
+			}
 
 			DBG("Reallocating syscall table from %zu to %zu entries", nbmem,
 					new_nbmem);
@@ -325,102 +333,3 @@ error:
 	rcu_read_unlock();
 	return ret;
 }
-
-/*
- * Add enabled syscall to the events list using the given kernel channel.
- *
- * Return the number of entry of the events array that is different from size
- * if the array grows. On error, return negative value and events is untouched.
- */
-ssize_t syscall_list_channel(struct ltt_kernel_channel *kchan,
-		struct lttng_event **_events, size_t size)
-{
-	int err, i;
-	size_t new_size;
-	ssize_t ret, count;
-	char *mask = NULL;
-	uint32_t len;
-	struct lttng_event *events = NULL;
-	/* Hash table used to filter duplicate out. */
-	struct lttng_ht *syscalls_ht = NULL;
-
-	assert(kchan);
-
-	/* Get syscall mask from the kernel tracer. */
-	err = kernel_syscall_mask(kchan->fd, &mask, &len);
-	if (err < 0) {
-		ret = err;
-		goto error;
-	}
-
-	ret = init_syscall_ht(&syscalls_ht);
-	if (ret < 0) {
-		goto error;
-	}
-
-	count = new_size = size;
-	events = *_events;
-
-	for (i = 0; i < len; i++) {
-		unsigned char val;
-		struct syscall *ksyscall;
-
-		bitfield_read_be(mask, unsigned char, i, 1, &val);
-		if (!val) {
-			/* Syscall is disabled, continue the loop. */
-			continue;
-		}
-
-		/* Skip empty syscall. */
-		if (*syscall_table[i].name == '\0') {
-			continue;
-		}
-
-		/* Syscall is enabled thus add it to the events list. */
-
-		if (count >= new_size) {
-			struct lttng_event *new_events;
-
-			/* Get the maximum here since count can be 0. */
-			new_size = max(count << 1, 1);
-			DBG3("Listing syscall realloc events array from %zu to %zu", count,
-					new_size);
-			new_events = realloc(events, new_size * sizeof(*new_events));
-			if (!new_events) {
-				PERROR("realloc kernel events list");
-				ret = -ENOMEM;
-				goto error;
-			}
-			memset(new_events + count, 0,
-					(new_size - count) * sizeof(*new_events));
-			events = new_events;
-		}
-
-		ksyscall = lookup_syscall(syscalls_ht, syscall_table[i].name);
-		if (ksyscall) {
-			update_event_syscall_bitness(events, i, ksyscall->index);
-			continue;
-		}
-
-		ret = add_syscall_to_ht(syscalls_ht, i, count);
-		if (ret < 0) {
-			goto error;
-		}
-
-		update_event_syscall_bitness(events, i, count);
-		strncpy(events[count].name, syscall_table[i].name,
-				sizeof(events[count].name));
-		events[count].enabled = 1;
-		events[count].type = LTTNG_KERNEL_SYSCALL;
-		count++;
-	}
-
-	*_events = events;
-
-	return count;
-
-error:
-	destroy_syscall_ht(syscalls_ht);
-	free(events);
-	return ret;
-}