Messages in this thread | | | Date | Tue, 25 Apr 2017 15:55:21 +0100 | From | Alan Cox <> | Subject | Re: [PATCH v4 1/2] tiocsti-restrict : Add owner user namespace to tty_struct |
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On Mon, 24 Apr 2017 01:15:11 -0400 Matt Brown <matt@nmatt.com> wrote:
> This patch adds struct user_namespace *owner_user_ns to the tty_struct. > Then it is set to current_user_ns() in the alloc_tty_struct function. > > This is done to facilitate capability checks against the original user > namespace that allocated the tty. > > E.g. ns_capable(tty->owner_user_ns,CAP_SYS_ADMIN) > > This combined with the use of user namespace's will allow hardening > protections to be built to mitigate container escapes that utilize TTY > ioctls such as TIOCSTI.
Regardles of the TIOCSTI usefulness this makes complete sense.
Alan
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