linux-kernel - [PATCH] doc: update 'unique identifiers'

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Message-Id: <1512422560-31290-1-git-send-email-me@tobin.cc>
Date:   Tue,  5 Dec 2017 08:22:40 +1100
From:   "Tobin C. Harding" <me@...in.cc>
To:     Jonathan Corbet <corbet@....net>
Cc:     "Tobin C. Harding" <me@...in.cc>,
        Kees Cook <keescook@...omium.org>,
        Laura Abbott <labbott@...hat.com>,
        Jessica Yu <jeyu@...hat.com>, linux-doc@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: [PATCH] doc: update 'unique identifiers'

Advice about what to use as a unique identifier is no longer valid since
patch series was merged to hash pointers printed with %p. We can use
this as a unique identifier now.

Signed-off-by: Tobin C. Harding <me@...in.cc>
---
 Documentation/security/self-protection.rst | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/Documentation/security/self-protection.rst b/Documentation/security/self-protection.rst
index 60c8bd8b77bf..f10f47cad825 100644
--- a/Documentation/security/self-protection.rst
+++ b/Documentation/security/self-protection.rst
@@ -274,8 +274,8 @@ Unique identifiers
 ------------------
 
 Kernel memory addresses must never be used as identifiers exposed to
-userspace. Instead, use an atomic counter, an idr, or similar unique
-identifier.
+userspace. Printk specifier %p hashes addresses by default now and can be
+used as a unique identifier.
 
 Memory initialization
 ---------------------
-- 
2.7.4