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Message-ID: <f1da002e-f982-7a3e-f539-17f3dac3a914@infradead.org>
Date: Sun, 17 Dec 2017 18:48:45 -0800
From: Randy Dunlap <rdunlap@...radead.org>
To: "Tobin C. Harding" <me@...in.cc>, Jonathan Corbet <corbet@....net>
Cc: 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: Re: [PATCH v2 2/3] doc: update kpt_restrict documentation
On 12/17/2017 02:30 PM, Tobin C. Harding wrote:
> Recently the behaviour of printk specifier %pK was changed. The
> documentation does not currently mirror this.
>
> Update documentation for sysctl kpt_restrict.
>
> 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 63663039acb7..6b039aa1427a 100644
> --- a/Documentation/sysctl/kernel.txt
> +++ b/Documentation/sysctl/kernel.txt
> @@ -391,7 +391,8 @@ 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
how about:
is set to 0 (the default),
or
is set to (0) [the default],
> +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
>
--
~Randy
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