From ccd992355df7192993c666236047820244914598 Mon Sep 17 00:00:00 2001 From: Daniel Baumann Date: Tue, 16 Apr 2024 21:19:13 +0200 Subject: Adding upstream version 1.21.8. Signed-off-by: Daniel Baumann --- test/fixedbugs/issue27695c.go | 65 +++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 65 insertions(+) create mode 100644 test/fixedbugs/issue27695c.go (limited to 'test/fixedbugs/issue27695c.go') diff --git a/test/fixedbugs/issue27695c.go b/test/fixedbugs/issue27695c.go new file mode 100644 index 0000000..948191c --- /dev/null +++ b/test/fixedbugs/issue27695c.go @@ -0,0 +1,65 @@ +// 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 ( + "io" + "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(error) error) error { + // Initialize callee args section with a bad pointer. + g(badPtr, badPtr, badPtr, badPtr) + + // Then call a function which returns a pointer. + // That return slot starts out holding a bad pointer. + return d(io.EOF) +} + +//go:noinline +func g(x, y, z, w uintptr) { +} + +type T struct { +} + +func (t *T) Foo(e error) error { + runtime.GC() + return e +} + +func main() { + // Functions + d := reflect.MakeFunc(reflect.TypeOf(func(e error) error { return e }), + func(args []reflect.Value) []reflect.Value { + runtime.GC() + return args + }).Interface().(func(error) error) + f(d) + + // Methods + x := reflect.ValueOf(&T{}).Method(0).Interface().(func(error) error) + f(x) +} -- cgit v1.2.3