On Thu, Aug 28, 2025 at 4:08 AM Rong Tao rtoax@foxmail.com wrote:

From: Rong Tao rongtao@cestc.cn

Add two tests for bpf_strnstr():

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

Signed-off-by: Rong Tao rongtao@cestc.cn

tools/testing/selftests/bpf/progs/string_kfuncs_success.c | 4 +++- 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/tools/testing/selftests/bpf/progs/string_kfuncs_success.c b/tools/testing/selftests/bpf/progs/string_kfuncs_success.c index 46697f381878..1b56bd5860e9 100644 --- a/tools/testing/selftests/bpf/progs/string_kfuncs_success.c +++ b/tools/testing/selftests/bpf/progs/string_kfuncs_success.c @@ -30,7 +30,9 @@ __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(str, "hello", 6); } +__test(0) int test_strnstr_found1(void *ctx) { return bpf_strnstr("", "", 0); } +__test(0) int test_strnstr_found2(void *ctx) { return bpf_strnstr(str, "hello", 5); }

add (str, "hello", 4) == -ENOENT case?

Also let's add negative ("", "a", 0) == -ENOENT case?

pw-bot: cr

+__test(0) int test_strnstr_found3(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