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" <redacted>
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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@lst.de>