musl - [PATCH 0/1] openpty: use TIOCGPTPEER to open slave side fd

Follow @Openwall on Twitter for new release announcements and other news

[<prev] [next>] [thread-next>] [day] [month] [year] [list]

Message-Id: <20170901153558.29715-1-christian.brauner@ubuntu.com>
Date: Fri,  1 Sep 2017 17:35:57 +0200
From: Christian Brauner <christian.brauner@...ntu.com>
To: musl@...ts.openwall.com
Cc: Christian Brauner <christian.brauner@...ntu.com>
Subject: [PATCH 0/1] openpty: use TIOCGPTPEER to open slave side fd

Hi,

Newer kernels expose the ioctl TIOCGPTPEER [1] call to userspace which allows to
safely allocate a file descriptor for a pty slave based solely on the master
file descriptor. This allows us to avoid path-based operations and makes this
function a lot safer in the face of devpts mounts in different mount namespaces.

[1]: https://patchwork.kernel.org/patch/9760743/

The way I wrote this patch it doesn't use the snprintf() and open() routine as a
fallback in case the ioctl() call fails. If this is a compatibility issue for
non-Linux systems I can rewrite. But the musl documentation gave me the
impression that this is not really a concern.

If possible, please Cc me on this since I'm not subscribed to the mailing list
(yet).

Thanks!
Christian

Christian Brauner (1):
  openpty: use TIOCGPTPEER to open slave side fd

 src/misc/openpty.c | 34 +++++++++++++++++++++++++++++++---
 1 file changed, 31 insertions(+), 3 deletions(-)

-- 
2.14.1

Confused about mailing lists and their use? Read about mailing lists on Wikipedia and check out these guidelines on proper formatting of your messages.