Re: kern/39424 (SIOCGIFFLAGS ioctl(2) from 4.0 does not work under compat netbsd32)

[Nicolas Joly <njoly%pasteur.fr@localhost>]

On Sat, Dec 05, 2009 at 08:41:42AM +1100, matthew green wrote:
> 
> my guess is that this commit is the problem:
> 
>       http://mail-index.netbsd.org/source-changes/2007/05/29/msg186117.html
> 
> it changed the size of struct ifreq, pushing the ifru_flags flags further
> into memory by sizeof(struct sockaddr_storage).
> 
> christos?  the comment says it should be backwrds compatible.

I do see the problem with compat linux32 which rely on compat netbsd32
for such ioctls (OSIOCGIFFLAGS).

njoly@nicodeme [linux/ioctls]> ifconfig -au |& grep flags
wm0: flags=8843<UP,BROADCAST,RUNNING,SIMPLEX,MULTICAST> mtu 1500
lo0: flags=8049<UP,LOOPBACK,RUNNING,MULTICAST> mtu 33648

njoly@nicodeme [linux/ioctls]> file siocgifflags
siocgifflags: ELF 64-bit LSB executable, x86-64, version 1 (SYSV), dynamically 
linked (uses shared libs), for GNU/Linux 2.4.1, not stripped
njoly@nicodeme [linux/ioctls]> ./siocgifflags 
wm0 0x8843
lo0 0x8049

njoly@nicodeme [linux/ioctls]> file siocgifflags
siocgifflags: ELF 32-bit LSB executable, Intel 80386, version 1 (SYSV), 
dynamically linked (uses shared libs), for GNU/Linux 2.4.1, not stripped
njoly@nicodeme [linux/ioctls]> ./siocgifflags 
wm0 0x3000
lo0 0x3000

-- 
Nicolas Joly

Biological Software and Databanks.
Institut Pasteur, Paris.