mirror of
https://github.com/golang/go
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59 lines
964 B
Go
59 lines
964 B
Go
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// run
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// Copyright 2018 The Go Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style
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// license that can be found in the LICENSE file.
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// Issue 26407: ensure that stack variables which have
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// had their address taken and then used in a comparison,
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// but are otherwise unused, are cleared.
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package main
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func main() {
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poison()
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test()
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}
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//go:noinline
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func poison() {
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// initialise the stack with invalid pointers
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var large [256]uintptr
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for i := range large {
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large[i] = 1
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}
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use(large[:])
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}
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//go:noinline
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func test() {
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a := 2
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x := &a
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if x != compare(&x) {
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panic("not possible")
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}
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}
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//go:noinline
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func compare(x **int) *int {
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var y *int
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if x == &y {
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panic("not possible")
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}
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// grow the stack to trigger a check for invalid pointers
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grow()
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if x == &y {
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panic("not possible")
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}
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return *x
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}
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//go:noinline
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func grow() {
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var large [1 << 16]uintptr
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use(large[:])
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}
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//go:noinline
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func use(_ []uintptr) { }
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