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Message-ID: <20250807134510.1818025-1-wakel@google.com>
Date: Thu, 7 Aug 2025 21:45:10 +0800
From: Wake Liu <wakel@...gle.com>
To: shuah@...nel.org
Cc: linux-kselftest@...r.kernel.org, linux-kernel@...r.kernel.org,
wakel@...gle.com
Subject: [PATCH] selftests/filesystems/binderfs: Skip tests if user namespaces
are unavailable
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@...gle.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;
--
2.50.1.703.g449372360f-goog
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