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

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Date:   Fri, 23 Jul 2021 13:05:26 -0700
From:   Kees Cook <keescook@...omium.org>
To:     Jonathan Corbet <corbet@....net>
Cc:     Kees Cook <keescook@...omium.org>, linux-kernel@...r.kernel.org,
        linux-doc@...r.kernel.org, linux-hardening@...r.kernel.org
Subject: [PATCH] deprecated.rst: Include details on "no_hash_pointers"

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>`_".
 
 Variable Length Arrays (VLAs)
 -----------------------------
-- 
2.30.2