Date: Sun, 26 Jul 2015 17:57:53 +0000 (UTC) From: Glen Barber <gjb@FreeBSD.org> To: src-committers@freebsd.org, svn-src-all@freebsd.org, svn-src-releng@freebsd.org Subject: svn commit: r285895 - releng/10.2/release/doc/en_US.ISO8859-1/relnotes Message-ID: <201507261757.t6QHvrBW070302@repo.freebsd.org>
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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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