virtio: console: Disable lseek(2) for port file operations
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>
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@ -809,6 +809,8 @@ static int port_fops_open(struct inode *inode, struct file *filp)
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reclaim_consumed_buffers(port);
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spin_unlock_irq(&port->outvq_lock);
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nonseekable_open(inode, filp);
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/* Notify host of port being opened */
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send_control_msg(filp->private_data, VIRTIO_CONSOLE_PORT_OPEN, 1);
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@ -840,6 +842,7 @@ static const struct file_operations port_fops = {
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.poll = port_fops_poll,
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.release = port_fops_release,
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.fasync = port_fops_fasync,
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.llseek = no_llseek,
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};
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/*
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