From: daw@mozart.cs.berkeley.edu (David Wagner)
To: linux-kernel@vger.kernel.org
Subject: Re: [RFC][2.5] generic_usercopy() function (resend, forgot the patches)
Date: 30 May 2003 00:25:54 GMT [thread overview]
Message-ID: <bb68ei$gk7$1@abraham.cs.berkeley.edu> (raw)
In-Reply-To: 3ECDEBC5.5030608@convergence.de
Michael Hunold wrote:
> /*
>- * helper function -- handles userspace copying for ioctl arguments
>- */
>-int
>-video_usercopy(struct inode *inode, struct file *file,
>- unsigned int cmd, unsigned long arg,
>- int (*func)(struct inode *inode, struct file *file,
>- unsigned int cmd, void *arg))
>-{
...
>- if (copy_from_user(parg, (void *)arg, _IOC_SIZE(cmd)))
...
>- err = func(inode, file, cmd, parg);
...
What about doubly-indirected pointers? i.e., arg is a pointer
to a structure that itself contains a pointer? Can this happen?
prev parent reply other threads:[~2003-05-30 0:38 UTC|newest]
Thread overview: 8+ messages / expand[flat|nested] mbox.gz Atom feed top
2003-05-23 9:37 [RFC][2.5] generic_usercopy() function (resend, forgot the patches) Michael Hunold
2003-05-23 9:47 ` Christoph Hellwig
2003-05-23 10:10 ` Michael Hunold
2003-05-23 10:19 ` Christoph Hellwig
2003-05-23 11:49 ` Gerd Knorr
2003-05-25 11:23 ` David Woodhouse
2003-05-23 11:17 ` Ingo Oeser
2003-05-30 0:25 ` David Wagner [this message]
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