Author: hrs
Date: Sat Mar 20 16:39:28 2010
New Revision: 205387
URL: http://svn.freebsd.org/changeset/base/205387
Log:
Update release notes:
merge two SysV IPC entries into one,
rtld(1) entries revised:
- dynamic string token subst
- PIE support improvement
- ELF object mapping change
Suggested by: kib
Approved by: re (implicitly)
Modified:
releng/7.3/release/doc/en_US.ISO8859-1/relnotes/article.sgml
Modified: releng/7.3/release/doc/en_US.ISO8859-1/relnotes/article.sgml
==============================================================================
--- releng/7.3/release/doc/en_US.ISO8859-1/relnotes/article.sgml Sat Mar
20 16:34:51 2010 (r205386)
+++ releng/7.3/release/doc/en_US.ISO8859-1/relnotes/article.sgml Sat Mar
20 16:39:28 2010 (r205387)
@@ -275,17 +275,14 @@
fixed. For more details, see <ulink
url="http://security.freebsd.org/advisories/FreeBSD-EN-10:02.sched_ule.asc";>EN-10:02.sched_ule</ulink>.</para>
- <para>&os; now supports shared memory segments for System V IPC
- which is larger than 2GB on 64-bit platforms. For more
- details, see <filename>/usr/src/UPDATING</filename>
- file.</para>
-
<para>The &man.sglist.9; API to manage scatter/gather lists of
physical addresses has been added.</para>
<para>&os; ABI of some of the structures used by the System V
- IPC API has been changed internally. For new kernel modules,
- the <function>kern_msgctl()</function>,
+ IPC API has been changed internally, and it now supports
+ shared memory segments for System V IPC which is larger than
+ 2GB on 64-bit platforms. For new kernel modules, the
+ <function>kern_msgctl()</function>,
<function>kern_semctl()</function>, and
<function>kern_shmctl()</function> functions will be
transparently renamed to the new
@@ -850,13 +847,54 @@
database. The &man.su.1; utility fails for the long
names.</para>
- <para>The &os; runtime linker, &man.rtld.1; now supports a new
- environment variable <varname>LD_ELF_HINTS_PATH</varname> for
- overriding the rtld hints file. This feature gives a
- convenient way of using a custom set of shared library that is
- not located in the default location and switch back. This
- environment variable is automatically unset if the process is
- tainted with setuid/setgid.</para>
+ <para>The &os; runtime linker, &man.rtld.1; has been improved.
+ The changes include:</para>
+
+ <itemizedlist>
+ <listitem>
+ <para>The dynamic string token substitution in the
+ <literal>rpath</literal> and <literal>soname</literal> has
+ been implemented. This can be enabled by setting
+ <option>-z <replaceable>origin</replaceable></option>
+ option of &man.ld.1;. Currently, it recognizes
+ <varname>$OSNAME</varname>, <varname>$PLATFORM</varname>,
+ <varname>$OSREL</varname>, and
+ <varname>$ORIGIN</varname> tokens. This translation is
+ unconditionally disabled for setuid/setgid
+ processes.</para>
+ </listitem>
+
+ <listitem>
+ <para>PIE (Position Independent Executables) support has
+ been improved. The runtime linker now calculates
+ relocation base for the main object, and applies the
+ relocation adjustment for all virtual addresses encoded
+ into the ELF structures of it in order to make it possible
+ to load PIE binaries at a non-zero base address.</para>
+ </listitem>
+
+ <listitem>
+ <para>The way the mapping of the ELF objects has been
+ changed to make wiring of the address space possible. It
+ now maps <literal>PROT_NONE</literal> anonymous memory
+ over the whole range first, and then mapping the segments
+ of the object over it. It allocates
+ <literal>.bss</literal> by changing the protection of the
+ range instead of remapping, and unnecessary clearing of
+ the text segment when its end is not page-aligned has been
+ eliminated.</para>
+ </listitem>
+
+ <listitem>
+ <para>A new environment variable
+ <varname>LD_ELF_HINTS_PATH</varname> for overriding the
+ rtld hints file has been supported. This feature gives a
+ convenient way of using a custom set of shared library
+ that is not located in the default location and switch
+ back. This environment variable is automatically unset if
+ the process is tainted with setuid/setgid.</para>
+ </listitem>
+ </itemizedlist>
<para>The &man.strptime.3; function now supports
<literal>%z</literal> format specifier.</para>
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