linux-kernel - Re: Userspace regression in LTS and stable kernels

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Message-ID: <CAGXu5jJoqnX54JnHZDVxO4NRCsT6sLH4+-TPk8GqCSVp0mFNLw@mail.gmail.com>
Date:   Wed, 13 Feb 2019 16:54:07 -0800
From:   Kees Cook <keescook@...omium.org>
To:     Samuel Dionne-Riel <samuel@...nne-riel.com>
Cc:     Richard Weinberger <richard.weinberger@...il.com>,
        LKML <linux-kernel@...r.kernel.org>,
        Linus Torvalds <torvalds@...ux-foundation.org>,
        Graham Christensen <graham@...hamc.com>,
        Oleg Nesterov <oleg@...hat.com>,
        Michal Hocko <mhocko@...e.com>,
        Andrew Morton <akpm@...ux-foundation.org>
Subject: Re: Userspace regression in LTS and stable kernels

On Wed, Feb 13, 2019 at 4:41 PM Samuel Dionne-Riel
<samuel@...nne-riel.com> wrote:
> Before, the interpreter was still used (assuming it wasn't cut by the
> length), and the interpreter was free to re-read the shebang if
> desired.

Oh awesome. Yeah, so, nevermind about the WARN_ONCE().

So, to address the "wrong binary" problem, how about we ENOEXEC only
if no newline or spaces are found in the string?

-- 
Kees Cook