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master
test/fixedbugs/issue16515.go
53 строки
1 KB
Cherry Zhang
cmd/compile: fix possible spill of invalid pointer with DUFFZERO on AMD64
29 июл 2016, 04:09
29 июл 2016, 04:09
111d590
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// run // Copyright 2016 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. // issue 16515: spilled Duff-adjusted address may be invalid package main import "runtime" type T [62]int // DUFFZERO with non-zero adjustment on AMD64 var sink interface{} //go:noinline func zero(x *T) { // Two DUFFZEROs on the same address with a function call in between. // Duff-adjusted address will be spilled and loaded *x = T{} // DUFFZERO runtime.GC() (*x)[0] = 1 g() // call a function with large frame, trigger a stack move *x = T{} // DUFFZERO again } //go:noinline // a function with large frame func g() { var x [1000]int _ = x } func main() { var s struct { a T; b [8192-62]int } // allocate 64K, hopefully it's in a new span and a few bytes before it is garbage sink = &s // force heap allocation s.a[0] = 2 zero(&s.a) if s.a[0] != 0 { println("s.a[0] =", s.a[0]) panic("zeroing failed") } var a T // on stack a[0] = 2 zero(&a) if a[0] != 0 { println("a[0] =", a[0]) panic("zeroing failed") } }