diff options
| author | Nicolas Lacasse <nlacasse@google.com> | 2019-06-26 11:26:18 -0700 |
|---|---|---|
| committer | gVisor bot <gvisor-bot@google.com> | 2019-06-26 11:27:31 -0700 |
| commit | 67e2f227aac49129936efc640a6c47a0978b187d (patch) | |
| tree | c41ee03a485e76d74c6cd26598316e9f53899589 /runsc/cmd/exec.go | |
| parent | e98ce4a2c681855b6b4f2c1298484f60014e4b88 (diff) | |
Always set SysProcAttr.Ctty to an FD in the child's FD table.
Go was going to change the behavior of SysProcAttr.Ctty such that it must be an
FD in the *parent* FD table:
https://go-review.googlesource.com/c/go/+/178919/
However, after some debate, it was decided that this change was too
backwards-incompatible, and so it was reverted.
https://github.com/golang/go/issues/29458
The behavior going forward is unchanged: the Ctty FD must be an FD in the
*child* FD table.
PiperOrigin-RevId: 255228476
Diffstat (limited to 'runsc/cmd/exec.go')
| -rw-r--r-- | runsc/cmd/exec.go | 16 |
1 files changed, 5 insertions, 11 deletions
diff --git a/runsc/cmd/exec.go b/runsc/cmd/exec.go index 5a823e89a..e817eff77 100644 --- a/runsc/cmd/exec.go +++ b/runsc/cmd/exec.go @@ -235,18 +235,12 @@ func (ex *Exec) execChildAndWait(waitStatus *syscall.WaitStatus) subcommands.Exi cmd.SysProcAttr = &syscall.SysProcAttr{ Setsid: true, Setctty: true, - Ctty: int(tty.Fd()), + // The Ctty FD must be the FD in the child process's FD + // table. Since we set cmd.Stdin/Stdout/Stderr to the + // tty FD, we can use any of 0, 1, or 2 here. + // See https://github.com/golang/go/issues/29458. + Ctty: 0, } - // TODO(b/133868570): Delete this check once Go 1.12 is no - // longer supported. - if console.CttyFdIsPostShuffle { - // In go1.12 and before, the Ctty FD must be the FD in - // the child process's FD table. Since we set - // cmd.Stdin/Stdout/Stderr to the tty FD, we can use - // any of 0, 1, or 2 here. - cmd.SysProcAttr.Ctty = 0 - } - } if err := cmd.Start(); err != nil { |