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-rw-r--r--src/test/test-bpf-restrict-fs.c102
1 files changed, 102 insertions, 0 deletions
diff --git a/src/test/test-bpf-restrict-fs.c b/src/test/test-bpf-restrict-fs.c
new file mode 100644
index 0000000..7ece337
--- /dev/null
+++ b/src/test/test-bpf-restrict-fs.c
@@ -0,0 +1,102 @@
+/* SPDX-License-Identifier: LGPL-2.1-or-later */
+
+#include "bpf-restrict-fs.h"
+#include "load-fragment.h"
+#include "manager.h"
+#include "process-util.h"
+#include "rlimit-util.h"
+#include "rm-rf.h"
+#include "service.h"
+#include "strv.h"
+#include "tests.h"
+#include "unit.h"
+#include "virt.h"
+
+static int test_restrict_filesystems(Manager *m, const char *unit_name, const char *file_path, char **allowed_filesystems) {
+ _cleanup_free_ char *exec_start = NULL;
+ _cleanup_(unit_freep) Unit *u = NULL;
+ ExecContext *ec = NULL;
+ int cld_code, r;
+
+ assert_se(u = unit_new(m, sizeof(Service)));
+ assert_se(unit_add_name(u, unit_name) == 0);
+ assert_se(ec = unit_get_exec_context(u));
+
+ STRV_FOREACH(allow_filesystem, allowed_filesystems) {
+ r = config_parse_restrict_filesystems(
+ u->id, "filename", 1, "Service", 1, "RestrictFileSystems", 0,
+ *allow_filesystem, ec, u);
+ if (r < 0)
+ return log_unit_error_errno(u, r, "Failed to parse RestrictFileSystems: %m");
+ }
+
+ assert_se(exec_start = strjoin("cat ", file_path));
+ r = config_parse_exec(u->id, "filename", 1, "Service", 1, "ExecStart",
+ SERVICE_EXEC_START, exec_start, SERVICE(u)->exec_command, u);
+ if (r < 0)
+ return log_error_errno(r, "Failed to parse ExecStart");
+
+ SERVICE(u)->type = SERVICE_ONESHOT;
+ u->load_state = UNIT_LOADED;
+
+ r = unit_start(u, NULL);
+ if (r < 0)
+ return log_error_errno(r, "Unit start failed %m");
+
+ while (!IN_SET(SERVICE(u)->state, SERVICE_DEAD, SERVICE_FAILED)) {
+ r = sd_event_run(m->event, UINT64_MAX);
+ if (r < 0)
+ return log_error_errno(r, "Event run failed %m");
+ }
+
+ cld_code = SERVICE(u)->exec_command[SERVICE_EXEC_START]->exec_status.code;
+ if (cld_code != CLD_EXITED)
+ return log_error_errno(-SYNTHETIC_ERRNO(EBUSY), "ExecStart didn't exited, code='%s'", sigchld_code_to_string(cld_code));
+
+ if (SERVICE(u)->state != SERVICE_DEAD)
+ return log_error_errno(-SYNTHETIC_ERRNO(EBUSY), "Service is not dead");
+
+ return 0;
+}
+
+int main(int argc, char *argv[]) {
+ _cleanup_(rm_rf_physical_and_freep) char *runtime_dir = NULL;
+ _cleanup_(manager_freep) Manager *m = NULL;
+ _cleanup_free_ char *unit_dir = NULL;
+ struct rlimit rl;
+ int r;
+
+ test_setup_logging(LOG_DEBUG);
+
+ ASSERT_OK(getrlimit(RLIMIT_MEMLOCK, &rl));
+ rl.rlim_cur = rl.rlim_max = MAX(rl.rlim_max, CAN_MEMLOCK_SIZE);
+ (void) setrlimit_closest(RLIMIT_MEMLOCK, &rl);
+
+ if (!can_memlock())
+ return log_tests_skipped("Can't use mlock()");
+
+ if (!bpf_restrict_fs_supported(/* initialize = */ true))
+ return log_tests_skipped("LSM BPF hooks are not supported");
+
+ r = enter_cgroup_subroot(NULL);
+ if (r == -ENOMEDIUM)
+ return log_tests_skipped("cgroupfs not available");
+
+ ASSERT_OK(get_testdata_dir("units", &unit_dir));
+ ASSERT_OK(set_unit_path(unit_dir));
+ assert_se(runtime_dir = setup_fake_runtime_dir());
+
+ ASSERT_OK(manager_new(RUNTIME_SCOPE_SYSTEM, MANAGER_TEST_RUN_BASIC, &m));
+ ASSERT_OK(manager_startup(m, NULL, NULL, NULL));
+
+ /* We need to enable access to the filesystem where the binary is so we
+ * add @common-block and @application */
+ ASSERT_LT(test_restrict_filesystems(m, "restrict_filesystems_test.service", "/sys/kernel/tracing/printk_formats", STRV_MAKE("@common-block", "@application")), 0);
+ ASSERT_OK(test_restrict_filesystems(m, "restrict_filesystems_test.service", "/sys/kernel/tracing/printk_formats", STRV_MAKE("tracefs", "@common-block", "@application")));
+ ASSERT_LT(test_restrict_filesystems(m, "restrict_filesystems_test.service", "/sys/kernel/tracing/printk_formats", STRV_MAKE("tracefs", "@common-block", "@application", "~tracefs")), 0);
+ ASSERT_LT(test_restrict_filesystems(m, "restrict_filesystems_test.service", "/sys/kernel/debug/sleep_time", STRV_MAKE("@common-block", "@application")), 0);
+ ASSERT_OK(test_restrict_filesystems(m, "restrict_filesystems_test.service", "/sys/kernel/debug/sleep_time", STRV_MAKE("debugfs", "@common-block", "@application")));
+ ASSERT_LT(test_restrict_filesystems(m, "restrict_filesystems_test.service", "/sys/kernel/debug/sleep_time", STRV_MAKE("~debugfs")), 0);
+
+ return 0;
+}