Re: [kernel-hardening] Re: [PATCH v6 0/2] security: tty: make TIOCSTI ioctl require CAP_SYS_ADMIN

[Serge E. Hallyn]

On Fri, May 19, 2017 at 12:48:17PM +1000, Peter Dolding wrote:
> Using cap_sys_admin as fix is like removing car windsheld because
> vision is being blocked by a rock hitting it.

Nonsense.  If the application has cap_sys_admin then it is less contained and
more trusted anyway.  If I went to the trouble to run an application in a
private user namespace (where it can have cap_sys_admin, but not targeted
at my tty) then it should be more contained.  That's the point of targeted
capabilities.