David Rientjes wrote:
>
> +static ssize_t clear_refs_write(struct file *file, const char __user *buf,
> + size_t count, loff_t *ppos)
> +{
> ...
> + task = get_proc_task(file->f_path.dentry->d_inode);
> + if (!task)
> + return -ESRCH;
> + clear_refs_smap(task->mm->mmap);
task->mm may be NULL and not stable, this needs get_task_mm() (may fail).
Don't we also need ->mmap_sem to iterate vmas?
Oleg.
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