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authorNeels Hofmeyr <nhofmeyr@sysmocom.de>2016-12-12 14:34:41 +0100
committerNeels Hofmeyr <nhofmeyr@sysmocom.de>2016-12-12 15:47:32 +0100
commit85b42c46184118db2aaa50e44e97966523dd0269 (patch)
tree17b3f6fb7afea3b319e9fd445cce7e15530bcd2d /tests/logging
parent9adf32fb60206065026e9c3ef7088ef6bcc013be (diff)
show bug in logging: erratic redirection to DLGLOBAL for invalid categories
Add a check to logging_test.c to show a bug: when a logging category value that is out-of-bounds is passed to the logging system, the internal map_subsys() function should remap that to DLGLOBAL. But in fact DLGLOBAL is -1 and the function fails to map this to a proper positive array index, directly returning -1 instead. This results in a negative array index and undefined behavior. A sanitize build should catch this. The bug is confirmed by the fact that logging_test.err stays the same (hopefully) although a logging output should appear from this patch. The test could as well segfault or anything else, it's a bit of a gamble. This bug will be fixed along with the expectation in a subsequent patch. Note: osmo_log_info->num_cat + 0 is also out-of-bounds, but there is a separate bug there, so leaving this for another patch. Change-Id: I161b6550fa204a872bad1abefee1a6155393fafd
Diffstat (limited to 'tests/logging')
-rw-r--r--tests/logging/logging_test.c8
1 files changed, 8 insertions, 0 deletions
diff --git a/tests/logging/logging_test.c b/tests/logging/logging_test.c
index 91b0aaf5..6c5a8f20 100644
--- a/tests/logging/logging_test.c
+++ b/tests/logging/logging_test.c
@@ -66,6 +66,8 @@ const struct log_info log_info = {
.filter_fn = test_filter,
};
+extern struct log_info *osmo_log_info;
+
int main(int argc, char **argv)
{
struct log_target *stderr_target;
@@ -108,5 +110,11 @@ int main(int argc, char **argv)
select_output = 1;
DEBUGP(DRLL, "You should see this\n");
OSMO_ASSERT(filter_called == 5); /* called twice on output */
+
+ /* Make sure out-of-bounds category maps to DLGLOBAL */
+ log_parse_category_mask(stderr_target, "DLGLOBAL,1");
+ DEBUGP(osmo_log_info->num_cat + 1, "You should see this on DLGLOBAL (a)\n");
+ DEBUGP(osmo_log_info->num_cat + 100, "You should see this on DLGLOBAL (b)\n");
+
return 0;
}