linux-hardening - Re: [PATCH] deprecated.rst: Include details on "no_hash

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Message-ID: <87o8aquoc2.fsf@meer.lwn.net>
Date:   Sun, 25 Jul 2021 14:32:13 -0600
From:   Jonathan Corbet <corbet@....net>
To:     Kees Cook <keescook@...omium.org>
Cc:     Kees Cook <keescook@...omium.org>, linux-kernel@...r.kernel.org,
        linux-doc@...r.kernel.org, linux-hardening@...r.kernel.org
Subject: Re: [PATCH] deprecated.rst: Include details on "no_hash_pointers"

Kees Cook <keescook@...omium.org> writes:

> Linus decided a debug toggle for %p was tolerable, so update the
> %p deprecation documentation.
>
> Signed-off-by: Kees Cook <keescook@...omium.org>
> ---
>  Documentation/process/deprecated.rst | 4 +++-
>  1 file changed, 3 insertions(+), 1 deletion(-)
>
> diff --git a/Documentation/process/deprecated.rst b/Documentation/process/deprecated.rst
> index 9d83b8db8874..8ced754a5a0f 100644
> --- a/Documentation/process/deprecated.rst
> +++ b/Documentation/process/deprecated.rst
> @@ -164,7 +164,9 @@ Paraphrasing Linus's current `guidance <https://lore.kernel.org/lkml/CA+55aFwQEd
>    up to Linus's scrutiny, maybe you can use "%px", along with making sure
>    you have sensible permissions.
>  
> -And finally, know that a toggle for "%p" hashing will `not be accepted <https://lore.kernel.org/lkml/CA+55aFwieC1-nAs+NFq9RTwaR8ef9hWa4MjNBWL41F-8wM49eA@mail.gmail.com/>`_.
> +If you are debugging something where "%p" hashing is causing problems,
> +you can temporarily boot with the debug flag "`no_hash_pointers
> +<https://git.kernel.org/linus/5ead723a20e0447bc7db33dc3070b420e5f80aa6>`_".

Applied, thanks.

jon