Messages in this thread |  | | Subject | Re: [RFC, PATCH] sys_revoke(), just a try. (was: Re: dynamic /dev security hole?) | From | Alan Cox <> | Date | Thu, 12 Aug 2004 20:51:19 +0100 |
| |
On Iau, 2004-08-12 at 17:49, Michael Buesch wrote: > +static ssize_t revoke_read(struct file *filp, > + char *buf, > + size_t count, > + loff_t *ppos) > +{ > + return 0; > +}
-EIO I think but I'm not sure I remember the BSD behaviour in full
> +static int filp_revoke(struct file *filp, struct inode *inode) > +{
First problem here is that the handle might still be in use for mmap, so you'd need to undo mmaps on it. A second is that while you can ->flush() here you can't really close it until the file usage count hits zero.
You are btw tackling a really really hard problem and its more likely the way to do this is to add revoke() methods to drivers and do it at the driver level - as the tty layer does with vhangup.
- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
|  |