linux-kernel - Re: [PATCH] Replace HTTP links with HTTPS ones: YAMA SECURITY MODULE

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Date:   Wed, 8 Jul 2020 01:05:39 -0700
From:   Kees Cook <keescook@...omium.org>
To:     "Alexander A. Klimov" <grandmaster@...klimov.de>
Cc:     corbet@....net, linux-doc@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] Replace HTTP links with HTTPS ones: YAMA SECURITY MODULE

On Wed, Jul 08, 2020 at 09:33:46AM +0200, Alexander A. Klimov wrote:
> Rationale:
> Reduces attack surface on kernel devs opening the links for MITM
> as HTTPS traffic is much harder to manipulate.
> 
> Deterministic algorithm:
> For each file:
>   If not .svg:
>     For each line:
>       If doesn't contain `\bxmlns\b`:
>         For each link, `\bhttp://[^# \t\r\n]*(?:\w|/)`:
> 	  If neither `\bgnu\.org/license`, nor `\bmozilla\.org/MPL\b`:
>             If both the HTTP and HTTPS versions
>             return 200 OK and serve the same content:
>               Replace HTTP with HTTPS.
> 
> Signed-off-by: Alexander A. Klimov <grandmaster@...klimov.de>
> ---
>  Continuing my work started at 93431e0607e5.
>  See also: git log --oneline '--author=Alexander A. Klimov <grandmaster@...klimov.de>' v5.7..master
>  (Actually letting a shell for loop submit all this stuff for me.)
> 
>  If there are any URLs to be removed completely or at least not HTTPSified:
>  Just clearly say so and I'll *undo my change*.
>  See also: https://lkml.org/lkml/2020/6/27/64
> 
>  If there are any valid, but yet not changed URLs:
>  See: https://lkml.org/lkml/2020/6/26/837
> 
>  If you apply the patch, please let me know.
> 
> 
>  Documentation/admin-guide/LSM/Yama.rst | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/Documentation/admin-guide/LSM/Yama.rst b/Documentation/admin-guide/LSM/Yama.rst
> index d0a060de3973..64fd62507ae5 100644
> --- a/Documentation/admin-guide/LSM/Yama.rst
> +++ b/Documentation/admin-guide/LSM/Yama.rst
> @@ -21,7 +21,7 @@ of their attack without resorting to user-assisted phishing.
>  
>  This is not a theoretical problem. SSH session hijacking
>  (http://www.storm.net.nz/projects/7) and arbitrary code injection

This link is dead. It is likely best replaced by:
https://www.blackhat.com/presentations/bh-usa-05/bh-us-05-boileau.pdf
(this is the same person, but it seems storm.net.nz is gone)

> -(http://c-skills.blogspot.com/2007/05/injectso.html) attacks already
> +(https://c-skills.blogspot.com/2007/05/injectso.html) attacks already
>  exist and remain possible if ptrace is allowed to operate as before.
>  Since ptrace is not commonly used by non-developers and non-admins, system
>  builders should be allowed the option to disable this debugging system.

With that change:

Acked-by: Kees Cook <keescook@...omium.org>

for the docs tree.

-- 
Kees Cook