Package: pbuilder Version: 0.226.1 Severity: normal Tags: patch Dear Maintainer,
It seems /dev/ptmx has incorrect permissions in a pbuilder chroot: # ls -l /dev/ptmx lrwxrwxrwx 1 root root 8 Oct 4 06:43 /dev/ptmx -> pts/ptmx # ls -l /dev/pts/ptmx c--------- 1 root root 5, 2 Oct 24 14:46 /dev/pts/ptmx Please compare to what's stated in https://www.kernel.org/doc/Documentation/filesystems/devpts.txt For comparison this is from my regular system: $ ls -l /dev/ptmx /dev/pts/ptmx crw-rw-rw- 1 root tty 5, 2 okt 24 17:03 /dev/ptmx c--------- 1 root root 5, 2 okt 11 12:35 /dev/pts/ptmx I've hacked up my pbuilder installation and confirmed that appending ",ptmxmode=0666" to the /dev/pts mount flags fixes the issue. This issue was detected while building the util-linux package where the testsuite now has started to fail (specifically the tests/ts/script/buffering-race test, since 'script' uses openpty). See attached patch. Regards, Andreas Henriksson -- System Information: Debian Release: stretch/sid APT prefers testing-debug APT policy: (500, 'testing-debug'), (500, 'testing'), (1, 'experimental') Architecture: amd64 (x86_64) Foreign Architectures: i386 Kernel: Linux 4.8.0-rc8-amd64 (SMP w/4 CPU cores) Locale: LANG=en_DK.UTF-8, LC_CTYPE=en_DK.UTF-8 (charmap=UTF-8) Shell: /bin/sh linked to /bin/dash Init: systemd (via /run/systemd/system) Versions of packages pbuilder depends on: ii debconf [debconf-2.0] 1.5.59 ii debootstrap 1.0.84 ii dpkg-dev 1.18.10 ii wget 1.18-4 Versions of packages pbuilder recommends: ii devscripts 2.16.8 ii eatmydata 105-5 ii fakeroot 1.21-2 ii iproute2 4.6.0-4 ii sudo 1.8.17p1-2 Versions of packages pbuilder suggests: ii cowdancer 0.81 ii gdebi-core 0.9.5.7 -- debconf information excluded
>From 709484ea7166cf232070bfeff8a3c42840036f44 Mon Sep 17 00:00:00 2001 From: Andreas Henriksson <andr...@fatal.se> Date: Mon, 24 Oct 2016 17:13:22 +0200 Subject: [PATCH] pbuilder-modules: Fix permissions of /dev/ptmx /dev/ptmx is a symlink to /dev/pts/ptmx and according to https://www.kernel.org/doc/Documentation/filesystems/devpts.txt we then need to use the mount flag (or chmod) to have proper permissions. Without this a call to openpty() will fail. For example as used by the 'script' utility executed in util-linux testsuite. --- pbuilder-modules | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/pbuilder-modules b/pbuilder-modules index e6a9e08..ec96dcc 100644 --- a/pbuilder-modules +++ b/pbuilder-modules @@ -372,7 +372,7 @@ function mountproc () { TTYGRP=5 TTYMODE=620 [ -f /etc/default/devpts ] && . /etc/default/devpts - mount -t devpts none "$BUILDPLACE/dev/pts" -onoexec,nosuid,gid=$TTYGRP,mode=$TTYMODE + mount -t devpts none "$BUILDPLACE/dev/pts" -onoexec,nosuid,gid=$TTYGRP,mode=$TTYMODE,ptmxmode=0666 mounted[${#mounted[@]}]="$BUILDPLACE/dev/pts" fi if [ -n "$SELINUX" ]; then -- 2.9.3
