git: if_tun: Disallow change network device type

[Aaron LI]

commit 017d03c14dd62ab3eaf8e62b04a5d0abca2a559c
Author: Aaron LI <aly at aaronly.me>
Date:   Mon Jul 9 12:45:24 2018 +0800

    if_tun: Disallow change network device type
    
    Disallow ioctl(2) to change the network device type of tun(4).
    Otherwise, page faults and panics can happen when access uninitialized
    fields in the "struct ifnet" which are specific to the network device
    type.
    
    Obtained-from: FreeBSD (revision 326362)

Summary of changes:
 share/man/man4/tun.4 | 11 ++++++++---
 sys/net/tun/if_tun.c |  3 ++-
 sys/net/tun/if_tun.h |  2 +-
 3 files changed, 11 insertions(+), 5 deletions(-)

http://gitweb.dragonflybsd.org/dragonfly.git/commitdiff/017d03c14dd62ab3eaf8e62b04a5d0abca2a559c


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