[PATCH 6/7] exec: Factor bprm_stack_limits out of prepare_arg_pages

[Christoph Hellwig]

On Tue, Jul 14, 2020 at 08:31:03AM -0500, Eric W. Biederman wrote:
> 
> In preparation for implementiong kernel_execve (which will take kernel
> pointers not userspace pointers) factor out bprm_stack_limits out of
> prepare_arg_pages.  This separates the counting which depends upon the
> getting data from userspace from the calculations of the stack limits
> which is usable in kernel_execve.
> 
> The remove prepare_args_pages and compute bprm->argc and bprm->envc
> directly in do_execveat_common, before bprm_stack_limits is called.
> 
> Signed-off-by: "Eric W. Biederman" <ebiederm at xmission.com>
> ---

This looks basically identical to my "exec: split prepare_arg_pages".
I slightly prefer the version I had, but this looks ok as well:

Reviewed-by: Christoph Hellwig <hch at lst.de>