Re: [PATCH 3/5] exec: unify compat_do_execve() code

[Oleg Nesterov <oleg@redhat.com>]

On 02/26, Oleg Nesterov wrote:
>
> Once again, to me "void __user*" looks better (just simpler). In this
> case get_arg_ptr() becomes (without const/__user for the clarity)
>
> 	void *get_arg_ptr(void **argv, int argc, bool compat)
> 	{
> 		char *ptr;
>
> 	#ifdef CONFIG_COMPAT
> 		if (unlikely(compat)) {
> 			compat_uptr_t *a = argv;
> 			compat_uptr_t p;
>
> 			if (get_user(p, a + argc))
> 				return ERR_PTR(-EFAULT);
>
> 			return compat_ptr(p);
> 		}
> 	#endif
>
> 		if (get_user(ptr, argv + argc))
> 			return ERR_PTR(-EFAULT);
>
> 		return ptr;
> 	}
>
> Otherwise, get_arg_ptr() should return conditional_user_ptr_t as well,

No, this is not true, I am stupid.

Still,

> this looks like the unnecessary complication to me, but of course this
> is subjective.
>
> So, what do you think?

Yes, please.

Oleg.