On Thu, Aug 25, 2011 at 12:29 +0400, Cyrill Gorcunov wrote:
> +static struct dentry *proc_map_files_lookup(struct inode *dir,
> + struct dentry *dentry, struct nameidata *nd)
> +{
> + struct task_struct *task;
> + unsigned long vm_start;
> + struct vm_area_struct *vma;
> + struct map_files_info info;
> + struct mm_struct *mm;
> + struct dentry *result;
> + char *endp;
> +
> + result = ERR_PTR(-ENOENT);
> + task = get_proc_task(dir);
> + if (!task)
> + goto out_no_task;
> +
> + result = ERR_PTR(-EPERM);
> + if (!ptrace_may_access(task, PTRACE_MODE_READ));
> + goto out_no_mm;
Probably
result = ERR_PTR(-ENOENT);
belongs here?
> + vm_start = simple_strtoul(dentry->d_name.name, &endp, 16);
> + if (*endp != '\0')
> + goto out_no_mm;
> +
> + mm = get_task_mm(task);
> + if (!mm)
> + goto out_no_mm;
> +
> + down_read(&mm->mmap_sem);
> + vma = find_exact_vma(mm, vm_start);
> + if (!vma)
> + goto out_no_vma;
> +
> + memset(&info, 0, sizeof(info));
> + info.file = vma->vm_file;
> + info.vm_start = vm_start;
> +
> + result = proc_map_files_instantiate(dir, dentry, task, &info);
> +
> +out_no_vma:
> + up_read(&mm->mmap_sem);
> + mmput(mm);
> +out_no_mm:
> + put_task_struct(task);
> +out_no_task:
> + return result;
> +}
--
Vasiliy Kulikov
http://www.openwall.com - bringing security into open computing environments
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