X-Git-Url: https://git.exim.org/exim.git/blobdiff_plain/26da7e207f1978012085c096366d623dc15b9778..33191679e1a86ba6d9c38a74d07:/src/README.UPDATING?ds=sidebyside

diff --git a/src/README.UPDATING b/src/README.UPDATING
index 45822fdef..40210a800 100644
--- a/src/README.UPDATING
+++ b/src/README.UPDATING
@@ -1,4 +1,4 @@
-$Cambridge: exim/src/README.UPDATING,v 1.13 2006/09/25 11:25:37 ph10 Exp $
+$Cambridge: exim/src/README.UPDATING,v 1.17 2009/10/16 07:35:42 tom Exp $
 
 This document contains detailed information about incompatibilities that might
 be encountered when upgrading from one release of Exim to another. The
@@ -28,6 +28,71 @@ The rest of this document contains information about changes in 4.xx releases
 that might affect a running system.
 
 
+Exim version 4.74
+-----------------
+
+ * No incompatible changes within Exim itself, but the integrated support for
+   dynamically loadable lookup modules has an ABI change from the modules
+   supported by some OS vendors through an unofficial patch. Don't try to
+   mix & match.
+
+
+Exim version 4.73
+-----------------
+
+ * The Exim run-time user can no longer be root; this was always
+   strongly discouraged, but is now prohibited both at build and
+   run-time.  If you need Exim to run routinely as root, you'll need to
+   patch the source and accept the risk.  Here be dragons.
+
+ * Exim will no longer accept a configuration file owned by the Exim
+   run-time user, unless that account is explicitly the value in
+   CONFIGURE_OWNER, which we discourage.  Exim now checks to ensure that
+   files are not writable by other accounts.
+
+ * The ALT_CONFIG_ROOT_ONLY build option is no longer optional and is forced
+   on; the Exim user can, by default, no longer use -C/-D and retain privilege.
+   Two new build options mitigate this.
+
+    * TRUSTED_CONFIG_LIST defines a file containing a whitelist of config
+      files that are trusted to be selected by the Exim user; one per line.
+      This is the recommended approach going forward.
+
+    * WHITELIST_D_MACROS defines a colon-separated list of macro names which
+      the Exim run-time user may safely pass without dropping privileges.
+      Because changes to this involve a recompile, this is not the recommended
+      approach but may ease transition.  The values of the macros, when
+      overriden, are constrained to match this regex: ^[A-Za-z0-9_/.-]*$
+
+ * The system_filter_user option now defaults to the Exim run-time user,
+   rather than root.  You can still set it explicitly to root and this
+   can be done with prior versions too, letting you roll versions
+   without needing to change this configuration option.
+
+ * ClamAV must be at least version 0.95 unless WITH_OLD_CLAMAV_STREAM is
+   defined at build time.
+
+
+Exim version 4.70
+-----------------
+
+1. Experimental Yahoo! Domainkeys support has been dropped in this release.
+It has been superceded by a native implementation of its successor DKIM.
+
+2. Up to version 4.69, Exim came with an embedded version of the PCRE library.
+As of 4.70, this is no longer the case. To compile Exim, you will need PCRE
+installed. Most OS distributions have ready-made library and develoment
+packages.
+
+
+Exim version 4.68
+-----------------
+
+1. The internal implementation of the database keys that are used for ACL
+ratelimiting has been tidied up. This means that an update to 4.68 might cause
+Exim to "forget" previous rates that it had calculated, and reset them to zero.
+
+
 Exim version 4.64
 -----------------
 
@@ -41,6 +106,27 @@ there is no remote transport (possible with a router that sets up host
 addresses), $smtp_active_hostname is used. This change is mentioned here in
 case somebody is relying on the use of $smtp_active_hostname.
 
+2. A bug has been fixed that might just possibly be something that is relied on
+in some configurations. In expansion items such as ${if >{xxx}{yyy}...} an
+empty string (that is {}) was being interpreted as if it was {0} and therefore
+treated as the number zero. From release 4.64, such strings cause an error
+because a decimal number, possibly followed by K or M, is required (as has
+always been documented).
+
+3. There has been a change to the GnuTLS support (ChangeLog/PH/20) to improve
+Exim's performance. Unfortunately, this has the side effect of being slightly
+non-upwards compatible for versions 4.50 and earlier. If you are upgrading from
+one of these earlier versions and you use GnuTLS, you must remove the file
+called gnutls-params in Exim's spool directory. If you don't do this, you will
+see this error:
+
+  TLS error on connection from ... (DH params import): Base64 decoding error.
+
+Removing the file causes Exim to recompute the relevant encryption parameters
+and cache them in the new format that was introduced for release 4.51 (May
+2005). If you are upgrading from release 4.51 or later, there should be no
+problem.
+
 
 Exim version 4.63
 -----------------