1 files changed, 48 insertions, 9 deletions

diff --git a/net/bpf/test_run.c b/net/bpf/test_run.c
index 1cd7a1c2f8b2..4c921f5154e0 100644
--- a/net/bpf/test_run.c
+++ b/net/bpf/test_run.c
@@ -10,6 +10,7 @@
 #include <net/bpf_sk_storage.h>
 #include <net/sock.h>
 #include <net/tcp.h>
+#include <linux/error-injection.h>
 
 #define CREATE_TRACE_POINTS
 #include <trace/events/bpf_test_run.h>
@@ -143,6 +144,14 @@ int noinline bpf_fentry_test6(u64 a, void *b, short c, int d, void *e, u64 f)
 	return a + (long)b + c + d + (long)e + f;
 }
 
+int noinline bpf_modify_return_test(int a, int *b)
+{
+	*b += 1;
+	return a + *b;
+}
+
+ALLOW_ERROR_INJECTION(bpf_modify_return_test, ERRNO);
+
 static void *bpf_test_init(const union bpf_attr *kattr, u32 size,
 			   u32 headroom, u32 tailroom)
 {
@@ -160,18 +169,48 @@ static void *bpf_test_init(const union bpf_attr *kattr, u32 size,
 		kfree(data);
 		return ERR_PTR(-EFAULT);
 	}
-	if (bpf_fentry_test1(1) != 2 ||
-	    bpf_fentry_test2(2, 3) != 5 ||
-	    bpf_fentry_test3(4, 5, 6) != 15 ||
-	    bpf_fentry_test4((void *)7, 8, 9, 10) != 34 ||
-	    bpf_fentry_test5(11, (void *)12, 13, 14, 15) != 65 ||
-	    bpf_fentry_test6(16, (void *)17, 18, 19, (void *)20, 21) != 111) {
-		kfree(data);
-		return ERR_PTR(-EFAULT);
-	}
+
 	return data;
 }
 
+int bpf_prog_test_run_tracing(struct bpf_prog *prog,
+			      const union bpf_attr *kattr,
+			      union bpf_attr __user *uattr)
+{
+	u16 side_effect = 0, ret = 0;
+	int b = 2, err = -EFAULT;
+	u32 retval = 0;
+
+	switch (prog->expected_attach_type) {
+	case BPF_TRACE_FENTRY:
+	case BPF_TRACE_FEXIT:
+		if (bpf_fentry_test1(1) != 2 ||
+		    bpf_fentry_test2(2, 3) != 5 ||
+		    bpf_fentry_test3(4, 5, 6) != 15 ||
+		    bpf_fentry_test4((void *)7, 8, 9, 10) != 34 ||
+		    bpf_fentry_test5(11, (void *)12, 13, 14, 15) != 65 ||
+		    bpf_fentry_test6(16, (void *)17, 18, 19, (void *)20, 21) != 111)
+			goto out;
+		break;
+	case BPF_MODIFY_RETURN:
+		ret = bpf_modify_return_test(1, &b);
+		if (b != 2)
+			side_effect = 1;
+		break;
+	default:
+		goto out;
+	}
+
+	retval = ((u32)side_effect << 16) | ret;
+	if (copy_to_user(&uattr->test.retval, &retval, sizeof(retval)))
+		goto out;
+
+	err = 0;
+out:
+	trace_bpf_test_finish(&err);
+	return err;
+}
+
 static void *bpf_ctx_init(const union bpf_attr *kattr, u32 max_size)
 {
 	void __user *data_in = u64_to_user_ptr(kattr->test.ctx_in);