Make sure that BPF programs can declare global kptr arrays and kptr fields
in struct types that is the type of a global variable or the type of a
nested descendant field in a global variable.
An array with only one element is special case, that it treats the element
like a non-array kptr field. Nested arrays are also tested to ensure they
are handled properly.
Signed-off-by: Kui-Feng Lee <thinker.li@xxxxxxxxx>
---
.../selftests/bpf/prog_tests/cpumask.c | 5 +
.../selftests/bpf/progs/cpumask_success.c | 171 ++++++++++++++++++
2 files changed, 176 insertions(+)
diff --git a/tools/testing/selftests/bpf/prog_tests/cpumask.c b/tools/testing/selftests/bpf/prog_tests/cpumask.c
index ecf89df78109..2570bd4b0cb2 100644
--- a/tools/testing/selftests/bpf/prog_tests/cpumask.c
+++ b/tools/testing/selftests/bpf/prog_tests/cpumask.c
@@ -18,6 +18,11 @@ static const char * const cpumask_success_testcases[] = {
"test_insert_leave",
"test_insert_remove_release",
"test_global_mask_rcu",
+ "test_global_mask_array_one_rcu",
+ "test_global_mask_array_rcu",
+ "test_global_mask_array_l2_rcu",
+ "test_global_mask_nested_rcu",
+ "test_global_mask_nested_deep_rcu",
"test_cpumask_weight",
};
diff --git a/tools/testing/selftests/bpf/progs/cpumask_success.c b/tools/testing/selftests/bpf/progs/cpumask_success.c
index 7a1e64c6c065..fd8106831c32 100644
--- a/tools/testing/selftests/bpf/progs/cpumask_success.c
+++ b/tools/testing/selftests/bpf/progs/cpumask_success.c
@@ -12,6 +12,31 @@ char _license[] SEC("license") = "GPL";
int pid, nr_cpus;
+struct kptr_nested {
+ struct bpf_cpumask __kptr * mask;
+};
+
+struct kptr_nested_pair {
+ struct bpf_cpumask __kptr * mask_1;
+ struct bpf_cpumask __kptr * mask_2;
+};
+
+struct kptr_nested_mid {
+ int dummy;
+ struct kptr_nested m;
+};
+
+struct kptr_nested_deep {
+ struct kptr_nested_mid ptrs[2];
+ struct kptr_nested_pair ptr_pairs[3];
+};
+
+private(MASK) static struct bpf_cpumask __kptr * global_mask_array[2];
+private(MASK) static struct bpf_cpumask __kptr * global_mask_array_l2[2][1];
+private(MASK) static struct bpf_cpumask __kptr * global_mask_array_one[1];
+private(MASK) static struct kptr_nested global_mask_nested[2];
+private(MASK_DEEP) static struct kptr_nested_deep global_mask_nested_deep;
+
static bool is_test_task(void)
{
int cur_pid = bpf_get_current_pid_tgid() >> 32;
@@ -460,6 +485,152 @@ int BPF_PROG(test_global_mask_rcu, struct task_struct *task, u64 clone_flags)
return 0;
}
+SEC("tp_btf/task_newtask")
+int BPF_PROG(test_global_mask_array_one_rcu, struct task_struct *task, u64 clone_flags)
+{
+ struct bpf_cpumask *local, *prev;
+
+ if (!is_test_task())
+ return 0;
+
+ /* Kptr arrays with one element are special cased, being treated
+ * just like a single pointer.
+ */
+
+ local = create_cpumask();
+ if (!local)
+ return 0;
+
+ prev = bpf_kptr_xchg(&global_mask_array_one[0], local);
+ if (prev) {
+ bpf_cpumask_release(prev);
+ err = 3;
+ return 0;
+ }
+
+ bpf_rcu_read_lock();
+ local = global_mask_array_one[0];
+ if (!local) {
+ err = 4;
+ bpf_rcu_read_unlock();
+ return 0;
+ }
+
+ bpf_rcu_read_unlock();
+
+ return 0;
+}
+
+static int _global_mask_array_rcu(struct bpf_cpumask **mask0,
+ struct bpf_cpumask **mask1)
+{
+ struct bpf_cpumask *local;
+
+ if (!is_test_task())
+ return 0;
+
+ /* Check if two kptrs in the array work and independently */
+
+ local = create_cpumask();
+ if (!local)
+ return 0;
+
+ bpf_rcu_read_lock();
+
+ local = bpf_kptr_xchg(mask0, local);
+ if (local) {
+ err = 1;
+ goto err_exit;
+ }
+
+ /* [<mask 0>, NULL] */
+ if (!*mask0 || *mask1) {
+ err = 2;
+ goto err_exit;
+ }
+
+ local = create_cpumask();
+ if (!local) {
+ err = 9;
+ goto err_exit;
+ }
+
+ local = bpf_kptr_xchg(mask1, local);
+ if (local) {
+ err = 10;
+ goto err_exit;
+ }
+
+ /* [<mask 0>, <mask 1>] */
+ if (!*mask0 || !*mask1 || *mask0 == *mask1) {
+ err = 11;
+ goto err_exit;
+ }
+
+err_exit:
+ if (local)
+ bpf_cpumask_release(local);
+ bpf_rcu_read_unlock();
+ return 0;
+}
+
+SEC("tp_btf/task_newtask")
+int BPF_PROG(test_global_mask_array_rcu, struct task_struct *task, u64 clone_flags)
+{
+ return _global_mask_array_rcu(&global_mask_array[0], &global_mask_array[1]);
+}
+
+SEC("tp_btf/task_newtask")
+int BPF_PROG(test_global_mask_array_l2_rcu, struct task_struct *task, u64 clone_flags)
+{
+ return _global_mask_array_rcu(&global_mask_array_l2[0][0], &global_mask_array_l2[1][0]);
+}
+
+SEC("tp_btf/task_newtask")
+int BPF_PROG(test_global_mask_nested_rcu, struct task_struct *task, u64 clone_flags)
+{
+ return _global_mask_array_rcu(&global_mask_nested[0].mask, &global_mask_nested[1].mask);
+}
+
+/* Ensure that the field->offset has been correctly advanced from one
+ * nested struct or array sub-tree to another. In the case of
+ * kptr_nested_deep, it comprises two sub-trees: ktpr_1 and kptr_2. By
+ * calling bpf_kptr_xchg() on every single kptr in both nested sub-trees,
+ * the verifier should reject the program if the field->offset of any kptr
+ * is incorrect.
+ *
+ * For instance, if we have 10 kptrs in a nested struct and a program that
+ * accesses each kptr individually with bpf_kptr_xchg(), the compiler
+ * should emit instructions to access 10 different offsets if it works
+ * correctly. If the field->offset values of any pair of them are
+ * incorrectly the same, the number of unique offsets in btf_record for
+ * this nested struct should be less than 10. The verifier should fail to
+ * discover some of the offsets emitted by the compiler.
+ *
+ * Even if the field->offset values of kptrs are not duplicated, the
+ * verifier should fail to find a btf_field for the instruction accessing a
+ * kptr if the corresponding field->offset is pointing to a random
+ * incorrect offset.
+ */
+SEC("tp_btf/task_newtask")
+int BPF_PROG(test_global_mask_nested_deep_rcu, struct task_struct *task, u64 clone_flags)
+{
+ int r, i;
+
+ r = _global_mask_array_rcu(&global_mask_nested_deep.ptrs[0].m.mask,
+ &global_mask_nested_deep.ptrs[1].m.mask);
+ if (r)
+ return r;
+
+ for (i = 0; i < 3; i++) {
+ r = _global_mask_array_rcu(&global_mask_nested_deep.ptr_pairs[i].mask_1,
+ &global_mask_nested_deep.ptr_pairs[i].mask_2);
+ if (r)
+ return r;
+ }
+ return 0;
+}
+
SEC("tp_btf/task_newtask")
int BPF_PROG(test_cpumask_weight, struct task_struct *task, u64 clone_flags)
{
--
2.34.1
