From 73df946d56c74384511a194dd01dbe099584fd1a Mon Sep 17 00:00:00 2001 From: Daniel Baumann Date: Sun, 28 Apr 2024 15:14:23 +0200 Subject: Adding upstream version 1.16.10. Signed-off-by: Daniel Baumann --- test/fixedbugs/issue27695b.go | 64 +++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 64 insertions(+) create mode 100644 test/fixedbugs/issue27695b.go (limited to 'test/fixedbugs/issue27695b.go') 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) +} -- cgit v1.2.3