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selftests/bpf: Assert link info uprobe_multi count & path_size if unset

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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>
Signed-off-by: Andrii Nakryiko <andrii@kernel.org>
Link: https://lore.kernel.org/bpf/20241011000803.681190-2-wudevelops@gmail.com
This commit is contained in:
Tyrone Wu 2024-10-11 00:08:03 +00:00 committed by Andrii Nakryiko
parent ad6b5b6ea9
commit b836cbdf3b
1 changed files with 9 additions and 0 deletions
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9
tools/testing/selftests/bpf/prog_tests/fill_link_info.c
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@ -420,6 +420,15 @@ 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);
if (!ASSERT_OK(err, "bpf_link_get_info_by_fd"))
return -1;
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);