os: Root.Mkdir creates directories with zero permissions on OpenBSD #73559
Description
Go version
go version go1.24.2 openbsd/amd64
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=''
GOAMD64='v1'
GOARCH='amd64'
GOAUTH='netrc'
GOBIN=''
GOCACHE='/home/jrick/.cache/go-build'
GOCACHEPROG=''
GODEBUG=''
GOENV='/home/jrick/.config/go/env'
GOEXE=''
GOEXPERIMENT=''
GOFIPS140='off'
GOFLAGS=''
GOGCCFLAGS='-fPIC -m64 -pthread -fno-caret-diagnostics -Qunused-arguments -Wl,--no-gc-sections -fmessage-length=0 -ffile-prefix-map=/tmp/go-build3747953386=/tmp/go-build -gno-record-gcc-switches'
GOHOSTARCH='amd64'
GOHOSTOS='openbsd'
GOINSECURE=''
GOMOD='/dev/null'
GOMODCACHE='/home/jrick/go/pkg/mod'
GONOPROXY=''
GONOSUMDB=''
GOOS='openbsd'
GOPATH='/home/jrick/go'
GOPRIVATE=''
GOPROXY='https://proxy.golang.org,direct'
GOROOT='/home/jrick/src/go'
GOSUMDB='sum.golang.org'
GOTELEMETRY='local'
GOTELEMETRYDIR='/home/jrick/.config/go/telemetry'
GOTMPDIR=''
GOTOOLCHAIN='local'
GOTOOLDIR='/home/jrick/src/go/pkg/tool/openbsd_amd64'
GOVCS=''
GOVERSION='go1.24.2'
GOWORK=''
PKG_CONFIG='pkg-config'What did you do?
Test program:
package main
import (
"fmt"
"os"
"path/filepath"
)
func main() {
rootPath, err := os.MkdirTemp("", "root")
if err != nil {
panic(err)
}
fmt.Println("tmp path", rootPath)
r, err := os.OpenRoot(rootPath)
if err != nil {
panic(err)
}
err = r.Mkdir("d", 0o777)
if err != nil {
panic(err)
}
if st, err := os.Stat(filepath.Join(r.Name(), "d")); err == nil {
fmt.Printf("%q mode %#o\n", st.Name(), st.Mode())
}
_, err = r.OpenRoot("d")
if err != nil {
panic(err)
}
}
What did you see happen?
On OpenBSD, os.Root.Mkdir creates a directory with perm mode 0o000:
$ go run .
tmp path /tmp/root2057846600
"d" mode 020000000000
panic: openat d: permission denied
goroutine 1 [running]:
main.main()
/home/jrick/hack/root-mkdir/a.go:32 +0x249
exit status 2
$ ls -l /tmp/root2057846600
total 4
d--------- 2 jrick wheel 512 Apr 30 17:01 d/
It works as expected on Linux:
$ go run .
tmp path /tmp/root3220349710
"d" mode 020000000755
$ echo $?
0
$ ls -l /tmp/root3220349710
total 1
drwxr-xr-x 2 jrick users 2 Apr 30 17:04 d/
What did you expect to see?
os.Root.Mkdir creating a directory with the proper permissions.