userspace stack start and end

[anupam kapoor]

>>>>> [Sun, 27 Jul 2014 11:52:27 -0500]: "Xin Tong" (xin-tong):

,----[ xin-tong ]
| I am trying to find the start and end address of the userspace stack.
| I see in the task_struct there is start_stack. But I could not find
| end_start anywhere in the kernel code ?
| 
| Can someone please tell me how to find the end of the stack ?
`----
but that should be computable right e.g.
    user:stack-end = user:stack-start + user:stack-segment-size * number-of-pages

kind regards
anupam