Andreas Henriksson <andr...@fatal.se> writes:
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.
IIRC, it would also need `,newinstance` option by then (otherwise
it will clobber "host system" devpts options).
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.
