From c6bc9735cf1486d40d85bba90cfc3aaa6537a9c0 Mon Sep 17 00:00:00 2001 From: David Kalnischkies Date: Wed, 10 Dec 2014 22:26:59 +0100 Subject: do not make PTY slave the controlling terminal MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit If we have no controlling terminal opening a terminal will make this terminal our controller, which is a serious problem if this happens to be the pseudo terminal we created to run dpkg in as we will close this terminal at the end hanging ourself up in the process… The offending open is the one we do to have at least one slave fd open all the time, but for good measure, we apply the flag also to the slave fd opening in the child process as we set the controlling terminal explicitely here. This is a regression from 150bdc9ca5d656f9fba94d37c5f4f183b02bd746 with the slight twist that this usecase was silently broken before in that it wasn't logging the output in term.log (as a pseudo terminal wasn't created). Closes: 772641 --- apt-pkg/deb/dpkgpm.cc | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) (limited to 'apt-pkg/deb') diff --git a/apt-pkg/deb/dpkgpm.cc b/apt-pkg/deb/dpkgpm.cc index 79120f6f5..8a8214c19 100644 --- a/apt-pkg/deb/dpkgpm.cc +++ b/apt-pkg/deb/dpkgpm.cc @@ -1127,7 +1127,7 @@ void pkgDPkgPM::StartPtyMagic() on kfreebsd we get an incorrect ("step like") output then while it has no problem with closing all references… so to avoid platform specific code here we combine both and be happy once more */ - d->protect_slave_from_dying = open(d->slave, O_RDWR | O_CLOEXEC); + d->protect_slave_from_dying = open(d->slave, O_RDWR | O_CLOEXEC | O_NOCTTY); } } } @@ -1159,7 +1159,7 @@ void pkgDPkgPM::SetupSlavePtyMagic() if (setsid() == -1) _error->FatalE("setsid", "Starting a new session for child failed!"); - int const slaveFd = open(d->slave, O_RDWR); + int const slaveFd = open(d->slave, O_RDWR | O_NOCTTY); if (slaveFd == -1) _error->FatalE("open", _("Can not write log (%s)"), _("Is /dev/pts mounted?")); else if (ioctl(slaveFd, TIOCSCTTY, 0) < 0) -- cgit v1.2.3