1 files changed, 158 insertions, 0 deletions
diff --git a/tools/testing/selftests/bpf/prog_tests/rcu_read_lock.c b/tools/testing/selftests/bpf/prog_tests/rcu_read_lock.c
new file mode 100644
index 000000000000..447d8560ecb6
--- /dev/null
+++ b/tools/testing/selftests/bpf/prog_tests/rcu_read_lock.c
@@ -0,0 +1,158 @@
+// SPDX-License-Identifier: GPL-2.0
+/* Copyright (c) 2022 Meta Platforms, Inc. and affiliates.*/
+
+#define _GNU_SOURCE
+#include <unistd.h>
+#include <sys/syscall.h>
+#include <sys/types.h>
+#include <test_progs.h>
+#include <bpf/btf.h>
+#include "rcu_read_lock.skel.h"
+#include "cgroup_helpers.h"
+
+static unsigned long long cgroup_id;
+
+static void test_success(void)
+{
+	struct rcu_read_lock *skel;
+	int err;
+
+	skel = rcu_read_lock__open();
+	if (!ASSERT_OK_PTR(skel, "skel_open"))
+		return;
+
+	skel->bss->target_pid = syscall(SYS_gettid);
+
+	bpf_program__set_autoload(skel->progs.get_cgroup_id, true);
+	bpf_program__set_autoload(skel->progs.task_succ, true);
+	bpf_program__set_autoload(skel->progs.no_lock, true);
+	bpf_program__set_autoload(skel->progs.two_regions, true);
+	bpf_program__set_autoload(skel->progs.non_sleepable_1, true);
+	bpf_program__set_autoload(skel->progs.non_sleepable_2, true);
+	err = rcu_read_lock__load(skel);
+	if (!ASSERT_OK(err, "skel_load"))
+		goto out;
+
+	err = rcu_read_lock__attach(skel);
+	if (!ASSERT_OK(err, "skel_attach"))
+		goto out;
+
+	syscall(SYS_getpgid);
+
+	ASSERT_EQ(skel->bss->task_storage_val, 2, "task_storage_val");
+	ASSERT_EQ(skel->bss->cgroup_id, cgroup_id, "cgroup_id");
+out:
+	rcu_read_lock__destroy(skel);
+}
+
+static void test_rcuptr_acquire(void)
+{
+	struct rcu_read_lock *skel;
+	int err;
+
+	skel = rcu_read_lock__open();
+	if (!ASSERT_OK_PTR(skel, "skel_open"))
+		return;
+
+	skel->bss->target_pid = syscall(SYS_gettid);
+
+	bpf_program__set_autoload(skel->progs.task_acquire, true);
+	err = rcu_read_lock__load(skel);
+	if (!ASSERT_OK(err, "skel_load"))
+		goto out;
+
+	err = rcu_read_lock__attach(skel);
+	ASSERT_OK(err, "skel_attach");
+out:
+	rcu_read_lock__destroy(skel);
+}
+
+static const char * const inproper_region_tests[] = {
+	"miss_lock",
+	"miss_unlock",
+	"non_sleepable_rcu_mismatch",
+	"inproper_sleepable_helper",
+	"inproper_sleepable_kfunc",
+	"nested_rcu_region",
+};
+
+static void test_inproper_region(void)
+{
+	struct rcu_read_lock *skel;
+	struct bpf_program *prog;
+	int i, err;
+
+	for (i = 0; i < ARRAY_SIZE(inproper_region_tests); i++) {
+		skel = rcu_read_lock__open();
+		if (!ASSERT_OK_PTR(skel, "skel_open"))
+			return;
+
+		prog = bpf_object__find_program_by_name(skel->obj, inproper_region_tests[i]);
+		if (!ASSERT_OK_PTR(prog, "bpf_object__find_program_by_name"))
+			goto out;
+		bpf_program__set_autoload(prog, true);
+		err = rcu_read_lock__load(skel);
+		ASSERT_ERR(err, "skel_load");
+out:
+		rcu_read_lock__destroy(skel);
+	}
+}
+
+static const char * const rcuptr_misuse_tests[] = {
+	"task_untrusted_non_rcuptr",
+	"task_untrusted_rcuptr",
+	"cross_rcu_region",
+};
+
+static void test_rcuptr_misuse(void)
+{
+	struct rcu_read_lock *skel;
+	struct bpf_program *prog;
+	int i, err;
+
+	for (i = 0; i < ARRAY_SIZE(rcuptr_misuse_tests); i++) {
+		skel = rcu_read_lock__open();
+		if (!ASSERT_OK_PTR(skel, "skel_open"))
+			return;
+
+		prog = bpf_object__find_program_by_name(skel->obj, rcuptr_misuse_tests[i]);
+		if (!ASSERT_OK_PTR(prog, "bpf_object__find_program_by_name"))
+			goto out;
+		bpf_program__set_autoload(prog, true);
+		err = rcu_read_lock__load(skel);
+		ASSERT_ERR(err, "skel_load");
+out:
+		rcu_read_lock__destroy(skel);
+	}
+}
+
+void test_rcu_read_lock(void)
+{
+	struct btf *vmlinux_btf;
+	int cgroup_fd;
+
+	vmlinux_btf = btf__load_vmlinux_btf();
+	if (!ASSERT_OK_PTR(vmlinux_btf, "could not load vmlinux BTF"))
+		return;
+	if (btf__find_by_name_kind(vmlinux_btf, "rcu", BTF_KIND_TYPE_TAG) < 0) {
+		test__skip();
+		goto out;
+	}
+
+	cgroup_fd = test__join_cgroup("/rcu_read_lock");
+	if (!ASSERT_GE(cgroup_fd, 0, "join_cgroup /rcu_read_lock"))
+		goto out;
+
+	cgroup_id = get_cgroup_id("/rcu_read_lock");
+	if (test__start_subtest("success"))
+		test_success();
+	if (test__start_subtest("rcuptr_acquire"))
+		test_rcuptr_acquire();
+	if (test__start_subtest("negative_tests_inproper_region"))
+		test_inproper_region();
+	if (test__start_subtest("negative_tests_rcuptr_misuse"))
+		test_rcuptr_misuse();
+	close(cgroup_fd);
+out:
+	btf__free(vmlinux_btf);
+}