git: if_tap: Disallow change network device type

Aaron LI aly at
Mon Jul 16 23:58:45 PDT 2018

commit fbae8fc9ab5d7b5dd6de56568897941ff6311568
Author: Aaron LI <aly at>
Date:   Tue Jul 17 14:29:44 2018 +0800

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

Summary of changes:
 share/man/man4/tap.4 | 11 +++++++++--
 sys/net/tap/if_tap.c |  3 ++-
 sys/net/tap/if_tap.h |  6 +++---
 3 files changed, 14 insertions(+), 6 deletions(-)

DragonFly BSD source repository

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