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When ASan is enabled, treat conversions to unsafe.Pointer as an escaping operation. In this way, all pointer operations on the stack objects will become operations on the escaped heap objects. As we've already supported ASan detection of error memory accesses to heap objects. With this trick, we can use -asan option to report errors on bad stack operations. Add test cases. Updates #44853. CustomizedGitHooks: yes Change-Id: I4e7fe46a3ce01f0d219e6a67dc50f4aff7d2ad87 Reviewed-on: https://go-review.googlesource.com/c/go/+/325629 Trust: Fannie Zhang <Fannie.Zhang@arm.com> Reviewed-by: Keith Randall <khr@golang.org>
29 lines
564 B
Go
29 lines
564 B
Go
// Copyright 2022 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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package main
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import (
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"fmt"
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"unsafe"
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)
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func main() {
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a := 1
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b := 2
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c := add(a, b)
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d := a + b
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fmt.Println(c, d)
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}
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//go:noinline
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func add(a1, b1 int) (ret int) {
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// The return value
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// When -asan is enabled, the unsafe.Pointer(&ret) conversion is escaping.
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var p *int = (*int)(unsafe.Pointer(uintptr(unsafe.Pointer(&ret)) + 1*unsafe.Sizeof(int(1))))
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*p = 123 // BOOM
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ret = a1 + b1
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return
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}
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