net/tun: handle compat_ioctl directly

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The tun driver is the only code in the kernel that operates
on a character device with struct ifreq. Change the driver
to handle the conversion itself so we can contain the
remaining ifreq handling in the socket layer.

This also fixes a bug in the handling of invalid ioctl
numbers on an unbound tun device. The driver treats this
as a TUNSETIFF in native mode, but there is no way for
the generic compat_ioctl() function to emulate this
behaviour. Possibly the driver was only doing this
accidentally anyway, but if any code relies on this
misfeature, it now also works in compat mode.

Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Signed-off-by: David S. Miller <davem@davemloft.net>

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Arnd Bergmann 2009-11-06 22:52:32 -08:00 • committed by David S. Miller

parent 2dceba14ef

commit 50857e2a59

2 changed files with 46 additions and 27 deletions

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fs/compat_ioctl.c

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