[PATCH bpf v1 2/2] selftests/bpf: assert link info uprobe_multi count & path_size if unset

Tyrone Wu
2024-10-09T22:07:03Z

Add assertions in `bpf_link_info.uprobe_multi` test to verify that
`count` and `path_size` fields are correctly populated when the fields
are unset.

This tests a previous bug where the `path_size` field was not populated
when `path` and `path_size` were unset.

Signed-off-by: Tyrone Wu <wudevelops@gmail.com>
---
tools/testing/selftests/bpf/prog_tests/fill_link_info.c | 7 +++++++
1 file changed, 7 insertions(+)

diff --git a/tools/testing/selftests/bpf/prog_tests/fill_link_info.c b/tools/testing/selftests/bpf/prog_tests/fill_link_info.c
index f3932941bbaa..a38cf2a999fe 100644
--- a/tools/testing/selftests/bpf/prog_tests/fill_link_info.c
+++ b/tools/testing/selftests/bpf/prog_tests/fill_link_info.c
@@ -417,6 +417,13 @@ verify_umulti_link_info(int fd, bool retprobe, __u64 *offsets,
if (!ASSERT_NEQ(err, -1, "readlink"))
return -1;

+ memset(&info, 0, sizeof(info));
+ err = bpf_link_get_info_by_fd(fd, &info, &len);
+
+ ASSERT_EQ(info.uprobe_multi.count, 3, "info.uprobe_multi.count");
+ ASSERT_EQ(info.uprobe_multi.path_size, strlen(path) + 1,
+ "info.uprobe_multi.path_size");
+
for (bit = 0; bit < 8; bit++) {
memset(&info, 0, sizeof(info));
info.uprobe_multi.path = ptr_to_u64(path_buf);
--
2.43.0