On Tuesday 06 March 2007 18:13, Jean Tourrilhes wrote:
> On Tue, Mar 06, 2007 at 02:27:26AM +0100, Johannes Berg wrote:
> > Hi,
> >
> > Wtf! After struggling with some strange problems with zd1211rw (see some
> > other mail) I decided to think again about what could possibly cause all
> > the other problems I'm having with it. The kernel seems fine, but iw*
> > userspace continually segfaults! And it also seems to be not
> > reproducible for most other people, I'd asked on IRC once a while.
> >
> > Well. Some thinking and stracing and thinking later it occurred to me...
> > Hell! wext is ioctls and includes this gem:
> >
> > struct iw_point
> > {
> > void __user *pointer; /* Pointer to the data (in user space) */
> > __u16 length; /* number of fields or size in bytes */
> > __u16 flags; /* Optional params */
> > };
> >
> > Of course nobody ever tells you this, but it's used in a shitload of
> > places.
>
> Yep, and it's even in fs/compat_ioctl.c. Hint, hint ;-)
Ok, it is wrapping the following ioctls:
HANDLE_IOCTL(SIOCGIWRANGE, do_wireless_ioctl)
HANDLE_IOCTL(SIOCSIWSPY, do_wireless_ioctl)
HANDLE_IOCTL(SIOCGIWSPY, do_wireless_ioctl)
HANDLE_IOCTL(SIOCSIWTHRSPY, do_wireless_ioctl)
HANDLE_IOCTL(SIOCGIWTHRSPY, do_wireless_ioctl)
HANDLE_IOCTL(SIOCGIWAPLIST, do_wireless_ioctl)
HANDLE_IOCTL(SIOCGIWSCAN, do_wireless_ioctl)
HANDLE_IOCTL(SIOCSIWESSID, do_wireless_ioctl)
HANDLE_IOCTL(SIOCGIWESSID, do_wireless_ioctl)
HANDLE_IOCTL(SIOCSIWNICKN, do_wireless_ioctl)
HANDLE_IOCTL(SIOCGIWNICKN, do_wireless_ioctl)
HANDLE_IOCTL(SIOCSIWENCODE, do_wireless_ioctl)
HANDLE_IOCTL(SIOCGIWENCODE, do_wireless_ioctl)
What about SIOCSIWSCAN, SIOCSIWENCODEEXT, SIOCGIWENCODEEXT
and some others that also use iw_point?
--
Greetings Michael.
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