linux-kernel - [bpf-next v2 2/2] selftests/bpf: Add tests for bpf

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Message-ID: <tencent_952D95A0D7B8D15C4434831621A2ACCACB07@qq.com>
Date: Thu, 28 Aug 2025 10:53:41 +0800
From: Rong Tao <rtoax@...mail.com>
To: andrii.nakryiko@...il.com,
	ast@...nel.org,
	daniel@...earbox.net
Cc: rtoax@...mail.com,
	Rong Tao <rongtao@...tc.cn>,
	Andrii Nakryiko <andrii@...nel.org>,
	Martin KaFai Lau <martin.lau@...ux.dev>,
	Eduard Zingerman <eddyz87@...il.com>,
	Song Liu <song@...nel.org>,
	Yonghong Song <yonghong.song@...ux.dev>,
	John Fastabend <john.fastabend@...il.com>,
	KP Singh <kpsingh@...nel.org>,
	Stanislav Fomichev <sdf@...ichev.me>,
	Hao Luo <haoluo@...gle.com>,
	Jiri Olsa <jolsa@...nel.org>,
	Mykola Lysenko <mykolal@...com>,
	Shuah Khan <shuah@...nel.org>,
	Viktor Malik <vmalik@...hat.com>,
	bpf@...r.kernel.org (open list:BPF [GENERAL] (Safe Dynamic Programs and Tools)),
	linux-kernel@...r.kernel.org (open list),
	linux-kselftest@...r.kernel.org (open list:KERNEL SELFTEST FRAMEWORK)
Subject: [bpf-next v2 2/2] selftests/bpf: Add tests for bpf_strnstr

From: Rong Tao <rongtao@...tc.cn>

Add two tests for bpf_strnstr():

    bpf_strnstr("", "", 0) = 0
    bpf_strnstr("hello world", "hello", 5) = 0

Signed-off-by: Rong Tao <rongtao@...tc.cn>
---
 tools/testing/selftests/bpf/progs/string_kfuncs_success.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/tools/testing/selftests/bpf/progs/string_kfuncs_success.c b/tools/testing/selftests/bpf/progs/string_kfuncs_success.c
index 46697f381878..f8fe14787b2e 100644
--- a/tools/testing/selftests/bpf/progs/string_kfuncs_success.c
+++ b/tools/testing/selftests/bpf/progs/string_kfuncs_success.c
@@ -30,6 +30,8 @@ __test(2) int test_strcspn(void *ctx) { return bpf_strcspn(str, "lo"); }
 __test(6) int test_strstr_found(void *ctx) { return bpf_strstr(str, "world"); }
 __test(-ENOENT) int test_strstr_notfound(void *ctx) { return bpf_strstr(str, "hi"); }
 __test(0) int test_strstr_empty(void *ctx) { return bpf_strstr(str, ""); }
+__test(0) int test_strnstr_found(void *ctx) { return bpf_strnstr("", "", 0); }
+__test(0) int test_strnstr_found(void *ctx) { return bpf_strnstr(str, "hello", 5); }
 __test(0) int test_strnstr_found(void *ctx) { return bpf_strnstr(str, "hello", 6); }
 __test(-ENOENT) int test_strnstr_notfound(void *ctx) { return bpf_strnstr(str, "hi", 10); }
 __test(0) int test_strnstr_empty(void *ctx) { return bpf_strnstr(str, "", 1); }
-- 
2.51.0