FreeBSD/alpha 4.11-RELEASE Release Notes

The FreeBSD Project

$FreeBSD: src/release/doc/en_US.ISO8859-1/relnotes/common/new.sgml,v 2005/01/21 11:16:10 hrs Exp $

The release notes for FreeBSD 4.11-RELEASE contain a summary of the changes made to the FreeBSD base system since 4.10-RELEASE. Both changes for kernel and userland are listed, as well as applicable security advisories for the base system that were issued since the last release. Some brief remarks on upgrading are also presented.

Table of Contents
1 Introduction
2 What's New
2.1 Security Advisories
2.2 Kernel Changes
2.2.1 Platform-Specific Hardware Support
2.2.2 Network Interface Support
2.2.3 Network Protocols
2.2.4 Disks and Storage
2.3 Userland Changes
2.4 Contributed Software
2.5 Release Engineering and Integration
3 Upgrading from previous releases of FreeBSD

1 Introduction

This document contains the release notes for FreeBSD 4.11-RELEASE on the Alpha/AXP hardware platform. It describes new features of FreeBSD that have been added (or changed) since 4.10-RELEASE. It also provides some notes on upgrading from previous versions of FreeBSD.

This distribution of FreeBSD 4.11-RELEASE is a release distribution. It can be found at or any of its mirrors. More information on obtaining this (or other) release distributions of FreeBSD can be found in the ``Obtaining FreeBSD'' appendix in the FreeBSD Handbook.

2 What's New

This section describes the most user-visible new or changed features in FreeBSD since 4.10-RELEASE. Typical release note items document new drivers or hardware support, new commands or options, major bugfixes, or contributed software upgrades. Security advisories for the base system that were issued after 4.10-RELEASE are also listed.

2.1 Security Advisories

A programming error in the FreeBSD Linux binary compatibility which allows a local attacker to read or write portions of the kernel memory has been fixed. For more details, see security advisory FreeBSD-SA-04:13.linux.

Various remotely-exploitable vulnerabilities of CVS's server mode including double-free, integer overflow, and buffer overflow which can result in information disclosure, denial-of-service, and/or possibly arbitrary code execution, have been fixed via an upgrade to CVS 1.11.17. For more details, see security advisory FreeBSD-SA-04:14.

A bug in the fetch(1) utility which allows a malicious HTTP server to cause arbitrary portions of the client's memory to be overwritten, has been fixed. For more information, see security advisory FreeBSD-SA-04:16.

A bug in procfs(5) and linprocfs(5) which could cause a malicious local user could perform a local denial of service attack by causing a system panic, or the user could read parts of kernel memory, has been fixed. For more information, see security advisory FreeBSD-SA-04:17.

2.2 Kernel Changes

The em(4) driver has been added to the kernel on the installation media.

A bug in mmap(2) that pages marked as PROT_NONE may become readable under certain circumstances, has been fixed.

Bugs in vm_object_madvise(), vm_object_sync(), and contigmalloc() functions in the FreeBSD virtual memory subsystem have been fixed. The bugs in vm_object_madvise() and vm_object_sync() could cause memory corruption in a variety of contexts, and one in contigmalloc() could cause a system panic.

2.2.1 Platform-Specific Hardware Support

Support for the floppy interface is broken on DS10-class systems. The kernel probes the hardware correctly but the floppy does not work properly. Booting and installing from floppies is not affected.

2.2.2 Network Interface Support

The axe(4) driver, which supports ASIX Electronics AX88172 USB 2.0 Ethernet chipset has been added.

The bge(4) driver now supports BCM5750 and BCM5751.

The em(4) driver now supports 82541ER and 82546GB dual port PCI Express adapter.

The ixgb(4) driver, which supports PCI Gigabit Ethernet adapters based on the Intel 82597EX Ethernet controller chips, has been added.

The ng_hub(4) Netgraph node type, which supports a simple packet distribution that acts like an Ethernet hub has been added.

A bug of jumbo frame handling in the sk(4) driver has been fixed.

The vr(4) driver now supports polling(4).

The per-interface polling(4) support has been implemented. All of the network drivers that support polling(4) ( dc(4), fxp(4), em(4), nge(4), re(4), rl(4), sis(4), ste(4), and vr(4)) now also support this capability and it can be controlled via ifconfig(8).

A system panic which occurs when net.inet.ip.rtexpire and/or net.inet6.ip6.rtexpire are set to 0 has been fixed.

2.2.3 Network Protocols

The random ephemeral port allocation, which come from OpenBSD has been implemented. This is enabled by default and can be disabled using the net.inet.ip.portrange.randomized sysctl. Note that the randomization can lead to extremely fast port reuse at high connection rates, which is causing problems for some users. To retain the security advantage of random ports and ensure correct operation, it is disabled during periods of high connection rates. More specifically, when the connection rate exceeds the value of the net.inet.ip.portrange.randomcps sysctl (10 by default), the randomization will be disabled for seconds specified in the net.inet.ip.portrange.randomtime sysctl (45 by default).

ipfw(4) now supports lookup tables. This feature is useful for handling large sparse address sets.

ipnat(8) now allows redirect rules to work for non-TCP/UDP packets.

The RST handling of the FreeBSD TCP stack has been improved to make reset attacks as difficult as possible while maintaining compatibility with the widest range of TCP stacks. The algorithm is as follows. For connections in the ESTABLISHED state, only resets with sequence numbers exactly matching last_ack_sent will cause a reset, all other segments will be silently dropped. For connections in all other states, a reset anywhere in the window will cause the connection to be reset. All other segments will be silently dropped. Note that this breaks the RFC 793 specification and you can still disable this and use the conventional behavior by setting a new sysctl net.inet.tcp.insecure_rst to 1.

2.2.4 Disks and Storage

The ips(4) driver, which supports IBM/Adaptec ServeRAID controller has been added.

The mpt(4) driver now supports LSI Logic FC929X Dual 2Gb/s Fibre Channel card.

The trm(4) driver now supports the DC395U2W adapters and problems under heavy load have been fixed.

2.3 Userland Changes

The cron(8) daemon now accepts two new options, -j and -J, to enable time jitter for jobs to run as unprivileged users and the superuser, respectively. Time jitter means that cron(8) will sleep for a small random period of time in the specified range before executing a job. This feature is intended to smooth load peaks appearing when a lot of jobs are scheduled for a particular moment.

The fwcontrol(8) now supports a -m option to set the default fwmem target.

The -C 60 option is now used in the default $inetd_flags variable in /etc/rc.conf.

The libc now supports eui64(3) functions.

The ngctl(8) now supports dot command to produce a GraphViz (.dot) of the entire Netgraph.

The LQM, Link Quality Monitoring support in ppp(8) has been reimplemented. The LQM, which is described in RFC 1989, allows PPP to keep track of the quality of a running connection.

The userland ppp(8) implementation now supports a ``set rad_alive N'' command to enable periodic RADIUS accounting information being sent to the RADIUS server.

A bug in rarpd(8) that prevents it from working properly when a interface has more than one IP address has been fixed.

syslogd(8) now supports LOG_NTP facility.

Several off-by-one errors and potential buffer overruns in pax(1) have been fixed.

whois(1) now supports NORID (Norwegian top level registry) handles, the German whois nameserver, and a -k flag for querying (the National Internet Development Agency of Korea) which hold details of IP address allocations within Korea.

2.4 Contributed Software

CVS has been updated from version 1.11.5 to version 1.11.17.

sendmail has been updated from version 8.12.11 to version 8.13.1.

GNU patch source files in src/contrib/patch has been removed. FreeBSD have used the patch(1) sources in src/gnu/usr.bin/patch for nearly seven years.

The timezone database has been updated from the tzdata2004e release to the tzdata2004g release.

2.5 Release Engineering and Integration

The supported release of GNOME has been updated from 2.6 to 2.8.2. The list of changes for each component can be found at

The supported release of KDE has been updated from 3.2.2 to 3.3.2.

The supported userland package for Linux binary compatibility has been updated from linux_base-6 (based on Red Hat Linux 7.1) to linux_base-8 (based on Red Hat Linux 8.0).

The supported release of X Window System has been updated to XFree86 4.4.0. Note that Xorg X11R6.8.1 is also available in the FreeBSD Ports Collection (x11/xorg).

The NOSECURE variable in make.conf has been removed because it is broken and no longer supported. If you had been using the NOSECURE, please now use the NOCRYPT instead.

3 Upgrading from previous releases of FreeBSD

If you're upgrading from a previous release of FreeBSD, you generally will have three options:

Please read the INSTALL.TXT file for more information, preferably before beginning an upgrade. If you are upgrading from source, please be sure to read /usr/src/UPDATING as well.

Finally, if you want to use one of various means to track the -STABLE or -CURRENT branches of FreeBSD, please be sure to consult the ``-CURRENT vs. -STABLE'' section of the FreeBSD Handbook.

Important: Upgrading FreeBSD should, of course, only be attempted after backing up all data and configuration files.

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