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virtio: console: Disable lseek(2) for port file operations

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The ports are char devices; do not have seeking capabilities.  Calling
nonseekable_open() from the fops_open() call and setting the llseek fops
pointer to no_llseek ensures an lseek() call from userspace returns
-ESPIPE.

Signed-off-by: Amit Shah <amit.shah@redhat.com>
CC: Arnd Bergmann <arnd@arndb.de>
Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
This commit is contained in:
Amit Shah 2010-09-16 14:43:09 +05:30 committed by Rusty Russell
parent a461e11e7b
commit 299fb61c08
1 changed files with 3 additions and 0 deletions
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3
drivers/char/virtio_console.c
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@ -809,6 +809,8 @@ static int port_fops_open(struct inode *inode, struct file *filp)
reclaim_consumed_buffers(port);
spin_unlock_irq(&port->outvq_lock);
nonseekable_open(inode, filp);
/* Notify host of port being opened */
send_control_msg(filp->private_data, VIRTIO_CONSOLE_PORT_OPEN, 1);
@ -840,6 +842,7 @@ static const struct file_operations port_fops = {
.poll = port_fops_poll,
.release = port_fops_release,
.fasync = port_fops_fasync,
.llseek = no_llseek,
};
/*