mail-mta/exim-4.94.2-r6: add patch to fix crash on resolve

Closes: https://bugs.gentoo.org/799368
Package-Manager: Portage-3.0.20, Repoman-3.0.2
Signed-off-by: Fabian Groffen <grobian@gentoo.org>

2 files changed, 689 insertions, 0 deletions

diff --git a/mail-mta/exim/exim-4.94.2-r6.ebuild b/mail-mta/exim/exim-4.94.2-r6.ebuild
new file mode 100644
index 000000000000..fd36c6e44c73
--- /dev/null
+++ b/mail-mta/exim/exim-4.94.2-r6.ebuild
@@ -0,0 +1,665 @@
+# Copyright 1999-2021 Gentoo Authors
+# Distributed under the terms of the GNU General Public License v2
+
+EAPI="7"
+
+inherit db-use toolchain-funcs multilib pam systemd
+
+IUSE="arc berkdb +dane dcc +dkim dlfunc dmarc +dnsdb doc dovecot-sasl
+dsn elibc_glibc exiscan-acl gdbm gnutls idn ipv6 ldap lmtp maildir mbx
+mysql nis pam perl pkcs11 postgres +prdr proxy radius redis sasl selinux
+socks5 spf sqlite srs +srs-alt srs-native +ssl syslog tdb tcpd +tpda X"
+REQUIRED_USE="
+	arc? ( dkim spf )
+	dane? ( ssl !gnutls )
+	dmarc? ( dkim spf )
+	dkim? ( ssl !gnutls )
+	gnutls? ( ssl )
+	pkcs11? ( ssl )
+	spf? ( exiscan-acl )
+	srs? (
+		exiscan-acl
+		^^ ( srs-alt srs-native )
+	)
+	|| ( berkdb gdbm tdb )
+"
+# NOTE on USE="gnutls dane", gnutls[dane] is masked in base, unmasked
+# for x86 and amd64 only, due to this, repoman won't allow depending on
+# gnutls[dane] for all else.  Because we cannot express USE=dane when
+# USE=gnutls is in effect only in package.use.mask, the only option we
+# have left is to a) ignore the dependency (but that results in bug
+# #661164) or b) mask the usage of USE=dane with USE=gnutls.  Both are
+# incorrect, but b) is the only "correct" view from repoman.
+# We cannot express a required use for berkdb/gdbm/tdb correctly because
+# berkdb and gdbm are both enabled in base profile
+
+SDIR=$([[ ${PV} == *_rc* ]]   && echo /test
+	 [[ ${PV} == *.*.*.* ]] && echo /fixes)
+COMM_URI="https://downloads.exim.org/exim4${SDIR}"
+
+DESCRIPTION="A highly configurable, drop-in replacement for sendmail"
+SRC_URI="${COMM_URI}/${P//_rc/-RC}.tar.xz
+	mirror://gentoo/system_filter.exim.gz
+	doc? ( ${COMM_URI}/${PN}-pdf-${PV//_rc/-RC}.tar.xz )"
+HOMEPAGE="https://www.exim.org/"
+
+SLOT="0"
+LICENSE="GPL-2"
+KEYWORDS="~alpha ~amd64 ~arm ~arm64 ~hppa ~ia64 ~ppc ~ppc64 ~sparc ~x86 ~x86-solaris"
+
+COMMON_DEPEND=">=sys-apps/sed-4.0.5
+	dev-libs/libpcre:=
+	tdb? ( sys-libs/tdb:= )
+	!tdb? ( berkdb? ( >=sys-libs/db-3.2:= <sys-libs/db-6:= ) )
+	!tdb? ( !berkdb? ( sys-libs/gdbm:= ) )
+	idn? ( net-dns/libidn:= net-dns/libidn2:= )
+	perl? ( dev-lang/perl:= )
+	pam? ( sys-libs/pam )
+	tcpd? ( sys-apps/tcp-wrappers )
+	ssl? (
+		gnutls? (
+			net-libs/gnutls:0=[pkcs11?]
+			dev-libs/libtasn1
+		)
+		!gnutls? (
+			dev-libs/openssl:0=
+		)
+	)
+	ldap? ( >=net-nds/openldap-2.0.7 )
+	elibc_glibc? (
+		net-libs/libnsl
+		nis? (
+			net-libs/libtirpc
+			>=net-libs/libnsl-1:=
+		)
+	)
+	mysql? ( dev-db/mysql-connector-c:= )
+	postgres? ( dev-db/postgresql:= )
+	sasl? ( >=dev-libs/cyrus-sasl-2.1.26-r2 )
+	redis? ( dev-libs/hiredis )
+	spf? ( >=mail-filter/libspf2-1.2.5-r1 )
+	dmarc? ( mail-filter/opendmarc:= )
+	srs? ( srs-alt? ( mail-filter/libsrs_alt ) )
+	X? (
+		x11-libs/libX11
+		x11-libs/libXmu
+		x11-libs/libXt
+		x11-libs/libXaw
+	)
+	sqlite? ( dev-db/sqlite )
+	radius? ( net-dialup/freeradius-client )
+	virtual/libcrypt:=
+	virtual/libiconv
+	"
+	# added X check for #57206
+BDEPEND="virtual/pkgconfig"
+DEPEND="${COMMON_DEPEND}"
+RDEPEND="${COMMON_DEPEND}
+	!mail-mta/courier
+	!mail-mta/esmtp
+	!mail-mta/mini-qmail
+	!<mail-mta/msmtp-1.4.19-r1
+	!>=mail-mta/msmtp-1.4.19-r1[mta]
+	!mail-mta/netqmail
+	!mail-mta/nullmailer
+	!mail-mta/postfix
+	!mail-mta/qmail-ldap
+	!mail-mta/sendmail
+	!mail-mta/opensmtpd
+	!<mail-mta/ssmtp-2.64-r2
+	!>=mail-mta/ssmtp-2.64-r2[mta]
+	!net-mail/mailwrapper
+	>=net-mail/mailbase-0.00-r5
+	virtual/logger
+	dcc? ( mail-filter/dcc )
+	selinux? ( sec-policy/selinux-exim )
+	"
+
+S=${WORKDIR}/${P//_rc/-RC}
+
+src_prepare() {
+	# Legacy patches which need a respin for -p1
+	eapply -p0 "${FILESDIR}"/exim-4.14-tail.patch
+	eapply -p0 "${FILESDIR}"/exim-4.74-radius-db-ENV-clash.patch # 287426
+	eapply     "${FILESDIR}"/exim-4.93-as-needed-ldflags.patch # 352265, 391279
+	eapply -p0 "${FILESDIR}"/exim-4.76-crosscompile.patch # 266591
+	eapply     "${FILESDIR}"/exim-4.69-r1.27021.patch
+	eapply     "${FILESDIR}"/exim-4.94-localscan_dlopen.patch
+	eapply     "${FILESDIR}"/exim-4.94.2-fix-crash-resolve.patch # 799368 upstr
+
+	# for this reason we have a := dep on opendmarc, they changed their
+	# API in a minor release
+	if use dmarc && has_version ">=mail-filter/opendmarc-1.4" ; then
+		eapply "${FILESDIR}"/exim-4.94-opendmarc-1.4.patch
+	fi
+
+	if use maildir ; then
+		eapply "${FILESDIR}"/exim-4.94-maildir.patch
+	else
+		eapply -p0 "${FILESDIR}"/exim-4.80-spool-mail-group.patch # 438606
+	fi
+
+	eapply_user
+
+	# user Exim believes it should be
+	MAILUSER=mail
+	MAILGROUP=mail
+	if use prefix && [[ ${EUID} != 0 ]] ; then
+		MAILUSER=$(id -un)
+		MAILGROUP=$(id -gn)
+	fi
+}
+
+src_configure() {
+	# general config and paths
+
+	local aliases="${EPREFIX}/etc/mail/aliases"
+	sed -i \
+		-e "/SYSTEM_ALIASES_FILE/s'SYSTEM_ALIASES_FILE'${aliases}'" \
+		src/configure.default || die
+
+	sed -i -e 's/^buildname=.*/buildname=exim-gentoo/' Makefile || die
+
+	if use elibc_musl; then
+		sed -i -e 's/^LIBS = -lnsl/LIBS =/g' OS/Makefile-Linux || die
+	fi
+
+	local conffile="${EPREFIX}/etc/exim/exim.conf"
+	sed -e "48i\CFLAGS=${CFLAGS}" \
+		-e "s:BIN_DIRECTORY=/usr/exim/bin:BIN_DIRECTORY=${EPREFIX}/usr/sbin:" \
+		-e "s;EXIM_USER=;EXIM_USER=ref:${MAILUSER};" \
+		-e "s:CONFIGURE_FILE=.*$:CONFIGURE_FILE=${conffile}:" \
+		-e "s:ZCAT_COMMAND=.*$:ZCAT_COMMAND=${EPREFIX}/bin/zcat:" \
+		-e "s:COMPRESS_COMMAND=.*$:COMPRESS_COMMAND=${EPREFIX}/bin/gzip:" \
+		src/EDITME > Local/Makefile || die
+
+	# work on Local/Makefile from now on
+	cd Local
+
+	cat >> Makefile <<- EOC
+		INFO_DIRECTORY=${EPREFIX}/usr/share/info
+		PID_FILE_PATH=${EPREFIX}/run/exim.pid
+		SPOOL_DIRECTORY=${EPREFIX}/var/spool/exim
+		HAVE_ICONV=yes
+	EOC
+
+	# configure db implementation, Exim always needs one for its hints
+	# database, we prefer tdb and gdbm, since bdb is kind of getting
+	# less and less support
+	if use tdb ; then
+		cat >> Makefile <<- EOC
+			USE_TDB=yes
+			DBMLIB = -ltdb
+		EOC
+		sed -i -e 's:^USE_DB=yes:# USE_DB=yes:' Makefile || die
+		sed -i -e 's:^USE_GDBM=yes:# USE_GDBM=yes:' Makefile || die
+	elif use berkdb ; then
+		# use the "native" interfaces to the DBM and CDB libraries, support
+		# passwd and directory lookups by default
+		local DB_VERS="5.3 5.1 4.8 4.7 4.6 4.5 4.4 4.3 4.2 3.2"
+		cat >> Makefile <<- EOC
+			USE_DB=yes
+			# keep include in CFLAGS because exim.h -> dbstuff.h -> db.h
+			CFLAGS += -I$(db_includedir ${DB_VERS})
+			DBMLIB = -l$(db_libname ${DB_VERS})
+		EOC
+		sed -i -e 's:^USE_GDBM=yes:# USE_GDBM=yes:' Makefile || die
+		sed -i -e 's:^USE_TDB=yes:# USE_TDB=yes:' Makefile || die
+	else # must be gdbm via required_use
+		cat >> Makefile <<- EOC
+			USE_GDBM=yes
+			DBMLIB = -lgdbm
+		EOC
+		sed -i -e 's:^USE_DB=yes:# USE_DB=yes:' Makefile || die
+		sed -i -e 's:^USE_TDB=yes:# USE_TDB=yes:' Makefile || die
+	fi
+
+	# if we use libiconv, now is the time to tell so
+	if use !elibc_glibc && use !elibc_musl ; then
+		cat >> Makefile <<- EOC
+			EXTRALIBS_EXIM=-liconv
+		EOC
+	fi
+
+	# support for IPv6
+	if use ipv6; then
+		cat >> Makefile <<- EOC
+			HAVE_IPV6=YES
+		EOC
+	fi
+
+	# support i18n/IDNA
+	if use idn; then
+		cat >> Makefile <<- EOC
+			SUPPORT_I18N=yes
+			SUPPORT_I18N_2008=yes
+			EXTRALIBS_EXIM += -lidn -lidn2
+		EOC
+	fi
+
+	#
+	# mail storage formats
+	#
+
+	# mailstore is Exim's traditional storage format
+	cat >> Makefile <<- EOC
+		SUPPORT_MAILSTORE=yes
+	EOC
+
+	# mbox
+	if use mbx; then
+		cat >> Makefile <<- EOC
+			SUPPORT_MBX=yes
+		EOC
+	fi
+
+	# maildir
+	if use maildir; then
+		cat >> Makefile <<- EOC
+			SUPPORT_MAILDIR=yes
+		EOC
+	fi
+
+	#
+	# lookup methods
+	#
+
+	# support passwd and directory lookups by default
+	cat >> Makefile <<- EOC
+		LOOKUP_CDB=yes
+		LOOKUP_PASSWD=yes
+		LOOKUP_DSEARCH=yes
+	EOC
+
+	if ! use dnsdb; then
+		# DNSDB lookup is enabled by default
+		sed -i -e 's:^LOOKUP_DNSDB=yes:# LOOKUP_DNSDB=yes:' Makefile || die
+	fi
+
+	if use ldap; then
+		cat >> Makefile <<- EOC
+			LOOKUP_LDAP=yes
+			LDAP_LIB_TYPE=OPENLDAP2
+			LOOKUP_INCLUDE += -I"${EPREFIX}"/usr/include/ldap
+			LOOKUP_LIBS += -lldap -llber
+		EOC
+	fi
+
+	if use mysql; then
+		cat >> Makefile <<- EOC
+			LOOKUP_MYSQL=yes
+			LOOKUP_INCLUDE += $(mysql_config --include)
+			LOOKUP_LIBS += $(mysql_config --libs)
+		EOC
+	fi
+
+	if use nis; then
+		cat >> Makefile <<- EOC
+			LOOKUP_NIS=yes
+			LOOKUP_NISPLUS=yes
+		EOC
+		if use elibc_glibc ; then
+			cat >> Makefile <<- EOC
+				LOOKUP_INCLUDE += -I"${EPREFIX}"/usr/include/tirpc
+				LOOKUP_LIBS += -lnsl
+			EOC
+		fi
+	fi
+
+	if use postgres; then
+		cat >> Makefile <<- EOC
+			LOOKUP_PGSQL=yes
+			LOOKUP_INCLUDE += -I$(pg_config --includedir)
+			LOOKUP_LIBS += -L$(pg_config --libdir) -lpq
+		EOC
+	fi
+
+	if use sqlite; then
+		cat >> Makefile <<- EOC
+			LOOKUP_SQLITE=yes
+			LOOKUP_SQLITE_PC=sqlite3
+		EOC
+	fi
+
+	if use redis; then
+		cat >> Makefile <<- EOC
+			LOOKUP_REDIS=yes
+			LOOKUP_LIBS += -lhiredis
+		EOC
+	fi
+
+	# Exim monitor, enabled by default, controlled via X USE-flag,
+	# disable if not requested, bug #46778
+	if use X; then
+		cp ../exim_monitor/EDITME eximon.conf || die
+		cat >> Makefile <<- EOC
+			EXIM_MONITOR=eximon.bin
+		EOC
+	fi
+
+	#
+	# features
+	#
+
+	# content scanning support
+	if use exiscan-acl; then
+		cat >> Makefile <<- EOC
+			WITH_CONTENT_SCAN=yes
+		EOC
+	fi
+
+	# DomainKeys Identified Mail, RFC4871
+	if ! use dkim; then
+		# DKIM is enabled by default
+		cat >> Makefile <<- EOC
+			DISABLE_DKIM=yes
+		EOC
+	fi
+
+	# Per-Recipient-Data-Response
+	if ! use prdr; then
+		# PRDR is enabled by default
+		cat >> Makefile <<- EOC
+			DISABLE_PRDR=yes
+		EOC
+	fi
+
+	# Transport post-delivery actions
+	if use !tpda && use !dane; then
+		# EVENT is enabled by default
+		cat >> Makefile <<- EOC
+			DISABLE_EVENT=yes
+		EOC
+	fi
+
+	# log to syslog
+	if use syslog; then
+		local eximlog="${EPREFIX}/var/log/exim/exim_%s.log"
+		sed -i \
+			-e "s:LOG_FILE_PATH=${eximlog}:LOG_FILE_PATH=syslog:" \
+			Makefile || die
+		cat >> Makefile <<- EOC
+			LOG_FILE_PATH=syslog
+		EOC
+	else
+		cat >> Makefile <<- EOC
+			LOG_FILE_PATH=${EPREFIX}/var/log/exim/exim_%s.log
+		EOC
+	fi
+
+	# starttls support (ssl)
+	if use ssl; then
+		if use gnutls; then
+			echo "USE_GNUTLS=yes" >> Makefile
+			echo "USE_GNUTLS_PC=gnutls $(use dane && echo gnutls-dane)" \
+				>> Makefile
+			use pkcs11 || echo "AVOID_GNUTLS_PKCS11=yes" >> Makefile
+		else
+			echo "USE_OPENSSL=yes" >> Makefile
+			echo "USE_OPENSSL_PC=openssl" >> Makefile
+		fi
+	else
+		echo "DISABLE_TLS=yes" >> Makefile
+	fi
+
+	# TCP wrappers
+	if use tcpd; then
+		cat >> Makefile <<- EOC
+			USE_TCP_WRAPPERS=yes
+			EXTRALIBS_EXIM += -lwrap
+		EOC
+	fi
+
+	# Light Mail Transport Protocol
+	if use lmtp; then
+		cat >> Makefile <<- EOC
+			TRANSPORT_LMTP=yes
+		EOC
+	fi
+
+	# embedded Perl
+	if use perl; then
+		cat >> Makefile <<- EOC
+			EXIM_PERL=perl.o
+		EOC
+	fi
+
+	# dlfunc
+	if use dlfunc; then
+		cat >> Makefile <<- EOC
+			EXPAND_DLFUNC=yes
+			HAVE_LOCAL_SCAN=yes
+			DLOPEN_LOCAL_SCAN=yes
+		EOC
+	fi
+
+	# Proxy Protocol
+	if use proxy; then
+		cat >> Makefile <<- EOC
+			SUPPORT_PROXY=yes
+		EOC
+	fi
+
+	# SOCKS5 (outbound) proxy support
+	if use socks5; then
+		cat >> Makefile <<- EOC
+			SUPPORT_SOCKS=yes
+		EOC
+	fi
+
+	# DANE
+	if use !dane; then
+		# DANE is enabled by default
+		sed -i -e 's:^SUPPORT_DANE=yes:# SUPPORT_DANE=yes:' Makefile || die
+	fi
+
+	# DMARC
+	if use dmarc; then
+		cat >> Makefile <<- EOC
+			SUPPORT_DMARC=yes
+			EXTRALIBS_EXIM += -lopendmarc
+		EOC
+	fi
+
+	# Sender Policy Framework
+	if use spf; then
+		cat >> Makefile <<- EOC
+			SUPPORT_SPF=yes
+			EXTRALIBS_EXIM += -lspf2
+		EOC
+	fi
+
+	#
+	# experimental features
+	#
+
+	# Authenticated Receive Chain
+	if use arc; then
+		echo "EXPERIMENTAL_ARC=yes">> Makefile
+	fi
+
+	# Distributed Checksum Clearinghouse
+	if use dcc; then
+		echo "EXPERIMENTAL_DCC=yes">> Makefile
+	fi
+
+	# Sender Rewriting Scheme
+	if use srs; then
+		# NOTE: we currently USE-default to srs-alt, because this is
+		# what USE=srs used to be.  Eventually we want to rid ourselves
+		# of this external implementation.
+		if use srs-alt; then
+			# historical default, from 4.95 this becomes
+			# EXPERIMENTAL_SRS_ALT
+			cat >> Makefile <<- EOC
+				EXPERIMENTAL_SRS=yes
+				EXTRALIBS_EXIM += -lsrs_alt
+			EOC
+		fi
+		if use srs-native; then
+			# this one becomes SUPPORT_SRS in 4.95
+			cat >> Makefile <<- EOC
+				EXPERIMENTAL_SRS_NATIVE=yes
+			EOC
+		fi
+	fi
+
+	# Delivery Sender Notifications extra information in fail message
+	if use dsn; then
+		cat >> Makefile <<- EOC
+			EXPERIMENTAL_DSN_INFO=yes
+		EOC
+	fi
+
+	#
+	# authentication (SMTP AUTH)
+	#
+
+	# standard bits
+	cat >> Makefile <<- EOC
+		AUTH_SPA=yes
+		AUTH_CRAM_MD5=yes
+		AUTH_PLAINTEXT=yes
+	EOC
+
+	# Cyrus SASL
+	if use sasl; then
+		cat >> Makefile <<- EOC
+			CYRUS_SASLAUTHD_SOCKET=${EPREFIX}/run/saslauthd/mux
+			AUTH_CYRUS_SASL=yes
+			AUTH_LIBS += -lsasl2
+		EOC
+	fi
+
+	# Dovecot
+	if use dovecot-sasl; then
+		cat >> Makefile <<- EOC
+			AUTH_DOVECOT=yes
+		EOC
+	fi
+
+	# Pluggable Authentication Modules
+	if use pam; then
+		cat >> Makefile <<- EOC
+			SUPPORT_PAM=yes
+			AUTH_LIBS += -lpam
+		EOC
+	fi
+
+	# Radius
+	if use radius; then
+		cat >> Makefile <<- EOC
+			RADIUS_CONFIG_FILE=${EPREFIX}/etc/radiusclient/radiusclient.conf
+			RADIUS_LIB_TYPE=RADIUSCLIENTNEW
+			AUTH_LIBS += -lfreeradius-client
+		EOC
+	fi
+}
+
+src_compile() {
+	emake CC="$(tc-getCC)" HOSTCC="$(tc-getBUILD_CC)" \
+		AR="$(tc-getAR) cq" RANLIB="$(tc-getRANLIB)" FULLECHO=''
+}
+
+src_install() {
+	cd "${S}"/build-exim-gentoo || die
+	dosbin exim
+	if use X; then
+		dosbin eximon.bin
+		dosbin eximon
+	fi
+	fperms 4755 /usr/sbin/exim
+
+	dosym exim /usr/sbin/sendmail
+	dosym exim /usr/sbin/rsmtp
+	dosym exim /usr/sbin/rmail
+	dosym ../sbin/exim /usr/bin/mailq
+	dosym ../sbin/exim /usr/bin/newaliases
+	dosym ../sbin/sendmail /usr/lib/sendmail
+
+	for i in exicyclog exim_dbmbuild exim_dumpdb exim_fixdb exim_lock \
+		exim_tidydb exinext exiwhat exigrep eximstats exiqsumm exiqgrep \
+		convert4r3 convert4r4 exipick
+	do
+		dosbin $i
+	done
+
+	dodoc -r "${S}"/doc/.
+	doman "${S}"/doc/exim.8
+	use dsn && dodoc "${S}"/README.DSN
+	use doc && dodoc "${WORKDIR}"/${PN}-pdf-${PV//rc/RC}/doc/*.pdf
+
+	# conf files
+	insinto /etc/exim
+	newins "${S}"/src/configure.default exim.conf.dist
+	if use exiscan-acl; then
+		newins "${S}"/src/configure.default exim.conf.exiscan-acl
+	fi
+	doins "${WORKDIR}"/system_filter.exim
+	doins "${FILESDIR}"/auth_conf.sub
+
+	if use pam; then
+		pamd_mimic system-auth exim auth account
+	fi
+
+	# headers, #436406
+	if use dlfunc ; then
+		# fixup includes so they actually can be found when including
+		sed -i \
+			-e '/#include "\(config\|store\|mytypes\).h"/s:"\(.\+\)":<exim/\1>:' \
+			local_scan.h || die
+		insinto /usr/include/exim
+		doins {config,local_scan}.h ../src/{mytypes,store}.h
+	fi
+
+	insinto /etc/logrotate.d
+	newins "${FILESDIR}/exim.logrotate" exim
+
+	newinitd "${FILESDIR}"/exim.rc10 exim
+	newconfd "${FILESDIR}"/exim.confd exim
+
+	systemd_dounit \
+		"${FILESDIR}"/{exim.service,exim.socket,exim-submission.socket}
+	systemd_newunit \
+		"${FILESDIR}"/exim_at.service 'exim@.service'
+	systemd_newunit \
+		"${FILESDIR}"/exim-submission_at.service 'exim-submission@.service'
+
+	diropts -m 0750 -o ${MAILUSER} -g ${MAILGROUP}
+	keepdir /var/log/${PN}
+}
+
+pkg_postinst() {
+	if [[ ! -f ${EROOT}/etc/exim/exim.conf ]] ; then
+		einfo "${EROOT}/etc/exim/system_filter.exim is a sample system_filter."
+		einfo "${EROOT}/etc/exim/auth_conf.sub contains the configuration sub"
+		einfo "for using smtp auth."
+		einfo "Please create ${EROOT}/etc/exim/exim.conf from"
+		einfo "  ${EROOT}/etc/exim/exim.conf.dist."
+	fi
+	if use dmarc ; then
+		einfo "DMARC support requires ${EROOT}/etc/exim/opendmarc.tlds"
+		einfo "you can populate this file with the contents downloaded from"
+		einfo "  https://publicsuffix.org/list/public_suffix_list.dat"
+	fi
+	if use dcc ; then
+		einfo "DCC support is experimental, you can find some limited"
+		einfo "documentation at the bottom of this prerelease message:"
+		einfo "  http://article.gmane.org/gmane.mail.exim.devel/3579"
+	fi
+	if use srs ; then
+		einfo "SRS support is experimental in this release of Exim"
+		if use srs-alt; then
+			elog "You are using libsrs_alt to implement SRS support."
+			elog "In future release of Exim, the native SRS implementation"
+			elog "(USE=srs-native) will become the default.  Please prepare"
+			elog "your package.use or switch to USE=srs-native now."
+		fi
+	fi
+	use dsn && einfo "extra information in fail DSN message is experimental"
+	einfo
+	elog "Note that this release contains a tainted variable check that"
+	elog "is likely to break your configuration used with Exim 4.93 and before."
+	elog "Please check your transports for occurences of \$local_part, and"
+	elog "use a replacement like \$local_part_data where possible."
+}
diff --git a/mail-mta/exim/files/exim-4.94.2-fix-crash-resolve.patch b/mail-mta/exim/files/exim-4.94.2-fix-crash-resolve.patch
new file mode 100644
index 000000000000..27e68bfdd74f
--- /dev/null
+++ b/mail-mta/exim/files/exim-4.94.2-fix-crash-resolve.patch
@@ -0,0 +1,24 @@
+From d4bc023436e4cce7c23c5f8bb5199e178b4cc743 Mon Sep 17 00:00:00 2001
+From: "Heiko Schlittermann (HS12-RIPE)" <hs@schlittermann.de>
+Date: Sun, 16 May 2021 19:11:19 +0200
+Subject: [PATCH] Fix host_name_lookup (Close 2747)
+
+https://bugs.exim.org/show_bug.cgi?id=2747
+
+(cherry picked from commit 20812729e3e47a193a21d326ecd036d67a8b2724)
+---
+ src/src/host.c | 4 ++--
+ 1 file changed, 2 insertions(+), 2 deletions(-)
+
+diff --git a/src/src/host.c b/src/src/host.c
+--- a/src/host.c
++++ b/src/host.c
+@@ -1691,7 +1691,7 @@ while ((ordername = string_nextinlist(&list, &sep, NULL, 0)))
+       {
+       uschar **aptr = NULL;
+       int ssize = 264;
+-      int count = 0;
++      int count = 1;  /* need 1 more for terminating NULL */
+       int old_pool = store_pool;
+ 
+       sender_host_dnssec = dns_is_secure(dnsa);