golang/go

x/sys/unix: AIX IOCTL SetWinsize integer overflows

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#74792 opened on Jul 29, 2025

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BugReportNeedsInvestigationcompiler/runtimehelp wanted

Description

Go version

go version go1.24.4 darwin/arm64

Output of go env in your module/workspace:

AR='ar'
CC='clang'
CGO_CFLAGS='-O2 -g'
CGO_CPPFLAGS=''
CGO_CXXFLAGS='-O2 -g'
CGO_ENABLED='1'
CGO_FFLAGS='-O2 -g'
CGO_LDFLAGS='-O2 -g'
CXX='clang++'
GCCGO='gccgo'
GO111MODULE=''
GOARCH='arm64'
GOARM64='v8.0'
GOAUTH='netrc'
GOBIN=''
GOCACHE='/Users/ayman/Library/Caches/go-build'
GOCACHEPROG=''
GODEBUG=''
GOENV='/Users/ayman/Library/Application Support/go/env'
GOEXE=''
GOEXPERIMENT=''
GOFIPS140='off'
GOFLAGS=''
GOGCCFLAGS='-fPIC -arch arm64 -pthread -fno-caret-diagnostics -Qunused-arguments -fmessage-length=0 -ffile-prefix-map=/var/folders/kl/jr58_v3n31g19ls79g3x4ch40000gn/T/go-build1222044133=/tmp/go-build -gno-record-gcc-switches -fno-common'
GOHOSTARCH='arm64'
GOHOSTOS='darwin'
GOINSECURE=''
GOMOD='/tmp/setwinsz/go.mod'
GOMODCACHE='/Users/ayman/.go/pkg/mod'
GONOPROXY='github.com/charmbracelet/ultraviolet,github.com/charmbracelet/bubbletea-internal,github.com/charmbracelet/lipgloss-internal'
GONOSUMDB='github.com/charmbracelet/ultraviolet,github.com/charmbracelet/bubbletea-internal,github.com/charmbracelet/lipgloss-internal'
GOOS='darwin'
GOPATH='/Users/ayman/.go'
GOPRIVATE='github.com/charmbracelet/ultraviolet,github.com/charmbracelet/bubbletea-internal,github.com/charmbracelet/lipgloss-internal'
GOPROXY='https://proxy.golang.org,direct'
GOROOT='/nix/store/rq7irijkj3nhapmjcv9d96xgkisj55x2-go-1.24.4/share/go'
GOSUMDB='sum.golang.org'
GOTELEMETRY='local'
GOTELEMETRYDIR='/Users/ayman/Library/Application Support/go/telemetry'
GOTMPDIR=''
GOTOOLCHAIN='auto'
GOTOOLDIR='/nix/store/rq7irijkj3nhapmjcv9d96xgkisj55x2-go-1.24.4/share/go/pkg/tool/darwin_arm64'
GOVCS=''
GOVERSION='go1.24.4'
GOWORK=''
PKG_CONFIG='pkg-config'

What did you do?

Run the following program for GOOS=aix GOARCH=ppc64

package main

import "golang.org/x/sys/unix"

func main() {
	_ = unix.IoctlSetWinsize(0, unix.TIOCSWINSZ, nil)
}

What did you see happen?

./main.go:6:30: cannot use unix.TIOCSWINSZ (untyped int constant 18446744071562622055) as int value in argument to unix.IoctlSetWinsize (overflows)

What did you expect to see?

The program to compile correctly.

Contributor guide

Tech stack
go
Domain
backend
Issue type
bug
DifficultyEstimated implementation difficulty for a new contributor, from 1 for very small changes to 5 for expert-level work.
3
Estimated timeA rough time range for an experienced contributor to investigate, implement, test, and prepare a pull request.
1-3 hours
Activity statusHow available the issue appears right now: fresh, active, stale, blocked, or waiting on maintainer input.
fresh
ClarityHow clearly the issue explains the expected change, acceptance criteria, and next step.
clear
Prerequisites
Go programmingunderstanding of integer typesknowledge of sys/unix package
Newbie friendlinessA 1-100 score estimating how approachable this issue is for first-time contributors.
60
Research direction
The issue is that TIOCSWINSZ constant on AIX overflows int. Check the definition in sys/unix/zerrors aix ppc64.go. The constant value is a large unsigned integer that overflows when assigned to int. Fix may involve using uint or converting to int with a mask. See similar platform specific constant fixes in the Go repository.