Date: Fri, 8 Dec 2017 09:27:55 +1100 From: "Tobin C. Harding" <me@...in.cc> To: Jonathan Corbet <corbet@....net> Cc: "Tobin C. Harding" <me@...in.cc>, Randy Dunlap <rdunlap@...radead.org>, linux-doc@...r.kernel.org, linux-kernel@...r.kernel.org, Kees Cook <keescook@...omium.org>, Alexander Popov <alex.popov@...ux.com>, kernel-hardening@...ts.openwall.com Subject: [PATCH 2/3] doc: update kpt_restrict documentation Recently the behaviour of printk specifier %pK was changed. The documentation does not currently mirror this. Update documentation for sysctl kpt_restrict. Reported-by: Alexander Popov <alex.popov@...ux.com> Signed-off-by: Tobin C. Harding <me@...in.cc> --- Documentation/sysctl/kernel.txt | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) diff --git a/Documentation/sysctl/kernel.txt b/Documentation/sysctl/kernel.txt index 694968c7523c..1698cd2ef16b 100644 --- a/Documentation/sysctl/kernel.txt +++ b/Documentation/sysctl/kernel.txt @@ -377,7 +377,8 @@ kptr_restrict: This toggle indicates whether restrictions are placed on exposing kernel addresses via /proc and other interfaces. -When kptr_restrict is set to (0), the default, there are no restrictions. +When kptr_restrict is set to (0), the default, the address is hashed before +printing. (This is the equivalent to %p.) When kptr_restrict is set to (1), kernel pointers printed using the %pK format specifier will be replaced with 0's unless the user has CAP_SYSLOG -- 2.7.4
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