svn commit: r285895 - releng/10.2/release/doc/en_US.ISO8859-1/relnotes
Glen Barber
gjb at FreeBSD.org
Sun Jul 26 17:57:54 UTC 2015
Author: gjb
Date: Sun Jul 26 17:57:53 2015
New Revision: 285895
URL: https://svnweb.freebsd.org/changeset/base/285895
Log:
Further refine the PAE_TABLES entry, based on feedback from
alc.
Approved by: re (implicit)
Sponsored by: The FreeBSD Foundation
Modified:
releng/10.2/release/doc/en_US.ISO8859-1/relnotes/article.xml
Modified: releng/10.2/release/doc/en_US.ISO8859-1/relnotes/article.xml
==============================================================================
--- releng/10.2/release/doc/en_US.ISO8859-1/relnotes/article.xml Sun Jul 26 17:57:35 2015 (r285894)
+++ releng/10.2/release/doc/en_US.ISO8859-1/relnotes/article.xml Sun Jul 26 17:57:53 2015 (r285895)
@@ -353,13 +353,16 @@
<para revision="282065" contrib="sponsor" sponsor="&ff;">The
<literal>PAE_TABLES</literal> kernel configuration option has
been added for &os;/&arch.i386;, which instructs &man.pmap.9;
- to use <acronym>PAE</acronym> format for page tables with
- 32-bit physical addresses. Unlike the <literal>PAE</literal>
- option, <literal>PAE_TABLES</literal> preserves kernel binary
- interface (<acronym>KBI</acronym>) compatibility with
- non-<literal>PAE</literal> kernels, allowing
- non-<literal>PAE</literal> kernel modules and drivers to work
- with a <literal>PAE_TABLES</literal>-enabled kernel.
+ to use <acronym>PAE</acronym> format for page tables while
+ maintaining a 32-bit physical address size elsewhere in the
+ kernel. The use of this option can enhance application-level
+ security by enabling the creation of <quote>no execute</quote>
+ mappings on modern &arch.i386; processors. Unlike the
+ <literal>PAE</literal> option, <literal>PAE_TABLES</literal>
+ preserves kernel binary interface (<acronym>KBI</acronym>)
+ compatibility with non-<literal>PAE</literal> kernels,
+ allowing non-<literal>PAE</literal> kernel modules and drivers
+ to work with a <literal>PAE_TABLES</literal>-enabled kernel.
Additionally, system limits are tuned for 4GB maximum
<acronym>RAM</acronym>, avoiding kernel virtual address space
(<acronym>KVA</acronym>) exhaustion.</para>
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