Re: [PATCH v4 3.0-rc2-tip 4/22] 4: Uprobes: register/unregister probes.

Oleg Nesterov
2011-06-13T19:59:04Z

On 06/07, Srikar Dronamraju wrote:
>
> +int register_uprobe(struct inode *inode, loff_t offset,
> + struct uprobe_consumer *consumer)
> +{
> + struct prio_tree_iter iter;
> + struct list_head try_list, success_list;
> + struct address_space *mapping;
> + struct mm_struct *mm, *tmpmm;
> + struct vm_area_struct *vma;
> + struct uprobe *uprobe;
> + int ret = -1;
> +
> + if (!inode || !consumer || consumer->next)
> + return -EINVAL;
> +
> + if (offset > inode->i_size)
> + return -EINVAL;
> +
> + uprobe = alloc_uprobe(inode, offset);
> + if (!uprobe)
> + return -ENOMEM;
> +
> + INIT_LIST_HEAD(&try_list);
> + INIT_LIST_HEAD(&success_list);
> + mapping = inode->i_mapping;
> +
> + mutex_lock(&uprobes_mutex);
> + if (uprobe->consumers) {
> + ret = 0;
> + goto consumers_add;
> + }
> +
> + mutex_lock(&mapping->i_mmap_mutex);
> + vma_prio_tree_foreach(vma, &iter, &mapping->i_mmap, 0, 0) {

I didn't actually read this patch yet, but this looks suspicious.
Why begin == end == 0? Doesn't this mean we are ignoring the mappings
with vm_pgoff != 0 ?

Perhaps this should be offset >> PAGE_SIZE?

Oleg.