The binderfs selftests, specifically `binderfs_stress` and `binderfs_test_unprivileged`, depend on user namespaces to run.

On kernels built without user namespace support (CONFIG_USER_NS=n), these tests will fail.

To prevent these failures, add a check for the availability of user namespaces by testing for the existence of "/proc/self/ns/user". If the check fails, skip the tests and print an informative message.

Signed-off-by: Wake Liu wakel@google.com --- .../selftests/filesystems/binderfs/binderfs_test.c | 10 ++++++++++ 1 file changed, 10 insertions(+)

diff --git a/tools/testing/selftests/filesystems/binderfs/binderfs_test.c b/tools/testing/selftests/filesystems/binderfs/binderfs_test.c index 81db85a5cc16..e77ed34ebd06 100644 --- a/tools/testing/selftests/filesystems/binderfs/binderfs_test.c +++ b/tools/testing/selftests/filesystems/binderfs/binderfs_test.c @@ -291,6 +291,11 @@ static int write_id_mapping(enum idmap_type type, pid_t pid, const char *buf, return 0; }

+static bool has_userns(void) +{ + return (access("/proc/self/ns/user", F_OK) == 0); +} + static void change_userns(struct __test_metadata *_metadata, int syncfds[2]) { int ret; @@ -378,6 +383,9 @@ static void *binder_version_thread(void *data) */ TEST(binderfs_stress) { + if (!has_userns()) + SKIP(return, "%s: user namespace not supported\n", __func__); + int fds[1000]; int syncfds[2]; pid_t pid; @@ -502,6 +510,8 @@ TEST(binderfs_test_privileged)

TEST(binderfs_test_unprivileged) { + if (!has_userns()) + SKIP(return, "%s: user namespace not supported\n", __func__); int ret; int syncfds[2]; pid_t pid;