Adding upstream version 1.21.8.upstream/1.21.8

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 64 insertions, 0 deletions

diff --git a/test/fixedbugs/issue27695b.go b/test/fixedbugs/issue27695b.go
new file mode 100644
index 0000000..d80acfb
--- /dev/null
+++ b/test/fixedbugs/issue27695b.go
@@ -0,0 +1,64 @@
+// run
+
+// Copyright 2018 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+// Make sure return values aren't scanned until they
+// are initialized, when calling functions and methods
+// via reflect.
+
+package main
+
+import (
+	"reflect"
+	"runtime"
+	"unsafe"
+)
+
+var badPtr uintptr
+
+var sink []byte
+
+func init() {
+	// Allocate large enough to use largeAlloc.
+	b := make([]byte, 1<<16-1)
+	sink = b // force heap allocation
+	//  Any space between the object and the end of page is invalid to point to.
+	badPtr = uintptr(unsafe.Pointer(&b[len(b)-1])) + 1
+}
+
+func f(d func() *byte) *byte {
+	// Initialize callee args section with a bad pointer.
+	g(badPtr)
+
+	// Then call a function which returns a pointer.
+	// That return slot starts out holding a bad pointer.
+	return d()
+}
+
+//go:noinline
+func g(x uintptr) {
+}
+
+type T struct {
+}
+
+func (t *T) Foo() *byte {
+	runtime.GC()
+	return nil
+}
+
+func main() {
+	// Functions
+	d := reflect.MakeFunc(reflect.TypeOf(func() *byte { return nil }),
+		func(args []reflect.Value) []reflect.Value {
+			runtime.GC()
+			return []reflect.Value{reflect.ValueOf((*byte)(nil))}
+		}).Interface().(func() *byte)
+	f(d)
+
+	// Methods
+	e := reflect.ValueOf(&T{}).Method(0).Interface().(func() *byte)
+	f(e)
+}