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-rw-r--r--tools/testing/selftests/bpf/progs/cb_refs.c116
1 files changed, 116 insertions, 0 deletions
diff --git a/tools/testing/selftests/bpf/progs/cb_refs.c b/tools/testing/selftests/bpf/progs/cb_refs.c
new file mode 100644
index 000000000..7653df1bc
--- /dev/null
+++ b/tools/testing/selftests/bpf/progs/cb_refs.c
@@ -0,0 +1,116 @@
+// SPDX-License-Identifier: GPL-2.0
+#include <vmlinux.h>
+#include <bpf/bpf_tracing.h>
+#include <bpf/bpf_helpers.h>
+
+struct map_value {
+ struct prog_test_ref_kfunc __kptr_ref *ptr;
+};
+
+struct {
+ __uint(type, BPF_MAP_TYPE_ARRAY);
+ __type(key, int);
+ __type(value, struct map_value);
+ __uint(max_entries, 16);
+} array_map SEC(".maps");
+
+extern struct prog_test_ref_kfunc *bpf_kfunc_call_test_acquire(unsigned long *sp) __ksym;
+extern void bpf_kfunc_call_test_release(struct prog_test_ref_kfunc *p) __ksym;
+
+static __noinline int cb1(void *map, void *key, void *value, void *ctx)
+{
+ void *p = *(void **)ctx;
+ bpf_kfunc_call_test_release(p);
+ /* Without the fix this would cause underflow */
+ return 0;
+}
+
+SEC("?tc")
+int underflow_prog(void *ctx)
+{
+ struct prog_test_ref_kfunc *p;
+ unsigned long sl = 0;
+
+ p = bpf_kfunc_call_test_acquire(&sl);
+ if (!p)
+ return 0;
+ bpf_for_each_map_elem(&array_map, cb1, &p, 0);
+ return 0;
+}
+
+static __always_inline int cb2(void *map, void *key, void *value, void *ctx)
+{
+ unsigned long sl = 0;
+
+ *(void **)ctx = bpf_kfunc_call_test_acquire(&sl);
+ /* Without the fix this would leak memory */
+ return 0;
+}
+
+SEC("?tc")
+int leak_prog(void *ctx)
+{
+ struct prog_test_ref_kfunc *p;
+ struct map_value *v;
+ unsigned long sl;
+
+ v = bpf_map_lookup_elem(&array_map, &(int){0});
+ if (!v)
+ return 0;
+
+ p = NULL;
+ bpf_for_each_map_elem(&array_map, cb2, &p, 0);
+ p = bpf_kptr_xchg(&v->ptr, p);
+ if (p)
+ bpf_kfunc_call_test_release(p);
+ return 0;
+}
+
+static __always_inline int cb(void *map, void *key, void *value, void *ctx)
+{
+ return 0;
+}
+
+static __always_inline int cb3(void *map, void *key, void *value, void *ctx)
+{
+ unsigned long sl = 0;
+ void *p;
+
+ bpf_kfunc_call_test_acquire(&sl);
+ bpf_for_each_map_elem(&array_map, cb, &p, 0);
+ /* It should only complain here, not in cb. This is why we need
+ * callback_ref to be set to frameno.
+ */
+ return 0;
+}
+
+SEC("?tc")
+int nested_cb(void *ctx)
+{
+ struct prog_test_ref_kfunc *p;
+ unsigned long sl = 0;
+ int sp = 0;
+
+ p = bpf_kfunc_call_test_acquire(&sl);
+ if (!p)
+ return 0;
+ bpf_for_each_map_elem(&array_map, cb3, &sp, 0);
+ bpf_kfunc_call_test_release(p);
+ return 0;
+}
+
+SEC("?tc")
+int non_cb_transfer_ref(void *ctx)
+{
+ struct prog_test_ref_kfunc *p;
+ unsigned long sl = 0;
+
+ p = bpf_kfunc_call_test_acquire(&sl);
+ if (!p)
+ return 0;
+ cb1(NULL, NULL, NULL, &p);
+ bpf_kfunc_call_test_acquire(&sl);
+ return 0;
+}
+
+char _license[] SEC("license") = "GPL";