netdev - Re: [Bug 7635] New: ioctl(fd,TCSBRK,1) on socket yields EFAULT, expected EINVAL/ENOTTY

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Date:	Fri, 08 Dec 2006 13:36:33 -0800 (PST)
From:	David Miller <davem@...emloft.net>
To:	shemminger@...l.org
Cc:	netdev@...r.kernel.org
Subject: Re: [Bug 7635] New: ioctl(fd,TCSBRK,1) on socket yields EFAULT,
 expected EINVAL/ENOTTY

From: Stephen Hemminger <shemminger@...l.org>
Date: Fri, 8 Dec 2006 09:50:55 -0800

> ioctl(TCSBRK,1)	errno
> pty		0
> pipe		22/EINVAL
> /dev/null	25/ENOTTY
> reg_file	25/ENOTTY
> socket		14/EFAULT

If you call a TTY ioctl on a socket, it might not work, don't
you think?

ioctl values are numbered in the namespace of the object they are
called upon, so an ioctl of value X can mean something different for a
TTY than it does for socket.

You're passing a garbage pointer to whatever socket ioctl happens
to be aliased to the same value as TCSBRK on your platform.
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