Re: [PATCH v3] exec: load_script: Do not exec truncated interpreter path

[Linus Torvalds]

On Fri, Feb 15, 2019 at 9:01 AM Kees Cook <keescook@xxxxxxxxxxxx> wrote:
>
> The !*first will never hit here (since it's been checked to be either
> ' ' or '\t', and if first == last it's whitespace all the way, so we
> could just return true here to bail out early (there's no interpreter
> at all, so we want to -ENOEXEC still).

Correct.

You do need the !*first test, but it needs to be after the loop
(because the next loop skips over the first non-space thing we found).

               Linus