linux-kernel - [PATCH AUTOSEL 6.11 20/30] selftests/bpf: Assert link info uprobe_multi count & path

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Message-ID: <20241023143012.2980728-20-sashal@kernel.org>
Date: Wed, 23 Oct 2024 10:29:45 -0400
From: Sasha Levin <sashal@...nel.org>
To: linux-kernel@...r.kernel.org,
	stable@...r.kernel.org
Cc: Tyrone Wu <wudevelops@...il.com>,
	Andrii Nakryiko <andrii@...nel.org>,
	Sasha Levin <sashal@...nel.org>,
	ast@...nel.org,
	daniel@...earbox.net,
	eddyz87@...il.com,
	shuah@...nel.org,
	jolsa@...nel.org,
	song@...nel.org,
	laoar.shao@...il.com,
	bpf@...r.kernel.org,
	linux-kselftest@...r.kernel.org
Subject: [PATCH AUTOSEL 6.11 20/30] selftests/bpf: Assert link info uprobe_multi count & path_size if unset

From: Tyrone Wu <wudevelops@...il.com>

[ Upstream commit b836cbdf3b81a4a22b3452186efa2e5105a77e10 ]

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@...il.com>
Signed-off-by: Andrii Nakryiko <andrii@...nel.org>
Link: https://lore.kernel.org/bpf/20241011000803.681190-2-wudevelops@gmail.com
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 tools/testing/selftests/bpf/prog_tests/fill_link_info.c | 9 +++++++++
 1 file changed, 9 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 f3932941bbaaf..59ef57145b63c 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 +417,15 @@ 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);
-- 
2.43.0