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master
test/fixedbugs/issue27695c.go
65 строк
1 KB
Keith Randall
runtime: when using explicit argmap, also use arglen
14 ноя 2018, 01:52
14 ноя 2018, 01:52
0098f8a
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// 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) }