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runtime: finalizer call has wrong frame size #51457

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cherrymui opened this issue Mar 3, 2022 · 5 comments
Closed

runtime: finalizer call has wrong frame size #51457

cherrymui opened this issue Mar 3, 2022 · 5 comments
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@cherrymui
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@cherrymui cherrymui commented Mar 3, 2022

What version of Go are you using (go version)?

tip (bcb89fc)

Does this issue reproduce with the latest release?

Yes. Reproduce with Go 1.17 and tip, not with Go 1.16.

What operating system and processor architecture are you using (go env)?

darwin/amd64

What did you do?

package main

import "runtime"

var ch = make(chan int, 2)

func main() {
	x, y := new([4]int64), new([4]int64) // not tinyalloc'd
	runtime.SetFinalizer(x, F)
	runtime.SetFinalizer(y, F)

	runtime.GC()
	runtime.GC()
	<- ch
	<- ch // make sure it tries to run the second finalizer, therefore the first reflectcall must finish
}

func F(p interface{}) [4]int64 { // 32-byte on-stack result, use up space for call32
	forceSpill()
	ch <- 1
	x := p.(*[4]int64)
	return *x
}

//go:noinline
func forceSpill() {}

This program runs fine with Go 1.16, but crash with Go 1.17 and tip. It is due to finalizer call has wrong frame size on register-ABI platforms, which leads to memory corruption.

Fixed by CL https://go-review.googlesource.com/c/go/+/389574 .

Open an issue for Go 1.18.

@cherrymui cherrymui added this to the Go1.18 milestone Mar 3, 2022
@cherrymui cherrymui added the NeedsFix label Mar 3, 2022
@cherrymui
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@cherrymui cherrymui commented Mar 3, 2022

@gopherbot please backport this to Go 1.17 release. Thanks.

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@gopherbot gopherbot commented Mar 3, 2022

Change https://go.dev/cl/388995 mentions this issue: [release-branch.go1.18] runtime: count spill slot for frame size at finalizer call

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@gopherbot gopherbot commented Mar 3, 2022

Backport issue(s) opened: #51458 (for 1.17).

Remember to create the cherry-pick CL(s) as soon as the patch is submitted to master, according to https://go.dev/wiki/MinorReleases.

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@gopherbot gopherbot commented Mar 3, 2022

Change https://go.dev/cl/389794 mentions this issue: [release-branch.go1.17] runtime: count spill slot for frame size at finalizer call

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@gopherbot gopherbot commented Mar 7, 2022

Closed by merging ce427cf to release-branch.go1.18.

gopherbot pushed a commit that referenced this issue Mar 7, 2022
…inalizer call

The finalizer is called using reflectcall. When register ABI is
used, the finalizer's argument is passed in register(s). But the
frame size calculation does not include the spill slot. When the
argument actually spills, it may clobber the caller's stack frame.
This CL fixes it.

Fixes #51457.

Change-Id: Ibcc7507c518ba65c1c5a7759e5cab0ae3fc7efce
Reviewed-on: https://go-review.googlesource.com/c/go/+/389574
Trust: Cherry Mui <cherryyz@google.com>
Run-TryBot: Cherry Mui <cherryyz@google.com>
TryBot-Result: Gopher Robot <gobot@golang.org>
Reviewed-by: Michael Knyszek <mknyszek@google.com>
(cherry picked from commit 58804ea)
Reviewed-on: https://go-review.googlesource.com/c/go/+/388995
Trust: Dmitri Shuralyov <dmitshur@golang.org>
Run-TryBot: Dmitri Shuralyov <dmitshur@golang.org>
gopherbot pushed a commit that referenced this issue Mar 14, 2022
…inalizer call

The finalizer is called using reflectcall. When register ABI is
used, the finalizer's argument is passed in register(s). But the
frame size calculation does not include the spill slot. When the
argument actually spills, it may clobber the caller's stack frame.
This CL fixes it.

Updates #51457.
Fixes #51458.

Change-Id: Ibcc7507c518ba65c1c5a7759e5cab0ae3fc7efce
Reviewed-on: https://go-review.googlesource.com/c/go/+/389574
Trust: Cherry Mui <cherryyz@google.com>
Run-TryBot: Cherry Mui <cherryyz@google.com>
TryBot-Result: Gopher Robot <gobot@golang.org>
Reviewed-by: Michael Knyszek <mknyszek@google.com>
(cherry picked from commit 58804ea)
Reviewed-on: https://go-review.googlesource.com/c/go/+/389794
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