--- /dev/null
+From c693c0d6c41e777def51984035710779697d1989 Mon Sep 17 00:00:00 2001
+From: Lars Wendler <polynomial-c@gentoo.org>
+Date: Tue, 6 Feb 2018 14:41:22 +0100
+Subject: [PATCH] Change libseccomp logic to not be automagic only.
+
+Introduce --with-libseccomp configure option so that users can disable
+seccomp even if libseccomp is available on the system.
+The default is unchanged to before this patch. If no --with(out)-libseccomp
+has been given on command line, the macro looks for presence of libseccomp
+and uses that if found.
+---
+ m4/man-libseccomp.m4 | 19 ++++++++++++++-----
+ 1 file changed, 14 insertions(+), 5 deletions(-)
+
+diff --git a/m4/man-libseccomp.m4 b/m4/man-libseccomp.m4
+index a9377317..17a52f72 100644
+--- a/m4/man-libseccomp.m4
++++ b/m4/man-libseccomp.m4
+@@ -1,9 +1,18 @@
+ # man-libseccomp.m4 serial 1
+ dnl MAN_LIBSECCOMP
+-dnl Check for the libseccomp library.
++dnl Add a --with-libseccomp option.
+ AC_DEFUN([MAN_LIBSECCOMP],
+-[PKG_CHECK_MODULES([libseccomp], [libseccomp],
+- [AC_DEFINE([HAVE_LIBSECCOMP], [1],
+- [Define to 1 if you have the `libseccomp' library.])],
+- [:])
++ [AC_ARG_WITH([libseccomp],
++ [AS_HELP_STRING([--with-libseccomp],
++ [use libseccomp to do most subprocessing])],
++ [],
++ [with_libseccomp=check])
++ if test "x$with_libseccomp" != "xno"; then
++ PKG_CHECK_MODULES([libseccomp], [libseccomp],
++ [AC_DEFINE([HAVE_LIBSECCOMP], [1],
++ [Define to 1 if you have the `libseccomp' library.])],
++ [if test "xyes" = "x$with_libseccomp"; then
++ AC_MSG_ERROR(--with-libseccomp given but cannot find libseccomp)
++ fi])
++ fi
+ ]) # MAN_LIBSECCOMP
+--
+2.16.1
+
--- /dev/null
+# Copyright 1999-2018 Gentoo Foundation
+# Distributed under the terms of the GNU General Public License v2
+
+EAPI=6
+
+inherit autotools ltprune user versionator
+
+DESCRIPTION="a man replacement that utilizes berkdb instead of flat files"
+HOMEPAGE="http://www.nongnu.org/man-db/"
+SRC_URI="mirror://nongnu/${PN}/${P}.tar.xz"
+
+LICENSE="GPL-3"
+SLOT="0"
+KEYWORDS="~alpha ~amd64 ~arm ~arm64 ~hppa ~ia64 ~m68k ~mips ~ppc ~ppc64 ~s390 ~sh ~sparc ~x86 ~amd64-linux ~arm-linux ~x86-linux"
+IUSE="berkdb +gdbm +manpager nls selinux static-libs zlib"
+
+CDEPEND="
+ !sys-apps/man
+ >=dev-libs/libpipeline-1.5.0
+ sys-apps/groff
+ berkdb? ( sys-libs/db:= )
+ gdbm? ( sys-libs/gdbm:= )
+ !berkdb? ( !gdbm? ( sys-libs/gdbm:= ) )
+ zlib? ( sys-libs/zlib )
+"
+DEPEND="
+ ${CDEPEND}
+ app-arch/xz-utils
+ virtual/pkgconfig
+ nls? (
+ >=app-text/po4a-0.45
+ sys-devel/gettext
+ )
+"
+RDEPEND="
+ ${CDEPEND}
+ selinux? ( sec-policy/selinux-mandb )
+"
+PDEPEND="manpager? ( app-text/manpager )"
+
+PATCHES=(
+ "${FILESDIR}/${PN}-2.8.0-libseccomp_automagic.patch"
+)
+
+pkg_setup() {
+ # Create user now as Makefile in src_install does setuid/chown
+ enewgroup man 15
+ enewuser man 13 -1 /usr/share/man man
+
+ if (use gdbm && use berkdb) || (use !gdbm && use !berkdb) ; then #496150
+ ewarn "Defaulting to USE=gdbm due to ambiguous berkdb/gdbm USE flag settings"
+ fi
+}
+
+src_prepare() {
+ default
+ eautoreconf
+}
+
+src_configure() {
+ export ac_cv_lib_z_gzopen=$(usex zlib)
+ local myeconfargs=(
+ --docdir='$(datarootdir)'/doc/${PF}
+ --with-systemdtmpfilesdir="${EPREFIX}"/usr/lib/tmpfiles.d
+ --enable-setuid
+ --enable-cache-owner=man
+ --with-sections="1 1p 8 2 3 3p 4 5 6 7 9 0p tcl n l p o 1x 2x 3x 4x 5x 6x 7x 8x"
+ $(use_enable nls)
+ $(use_enable static-libs static)
+ # fails to show any man page with this error message:
+ # man: /usr/libexec/man-db/manconv -f UTF-8:ISO-8859-1 -t UTF-8//IGNORE: Bad system call
+ # This will be made optional or hard enabled once the issue has been resolved.
+ --without-libseccomp
+ --with-db=$(usex gdbm gdbm $(usex berkdb db gdbm))
+ )
+ econf "${myeconfargs[@]}"
+
+ # Disable color output from groff so that the manpager can add it. #184604
+ sed -i \
+ -e '/^#DEFINE.*\<[nt]roff\>/{s:^#::;s:$: -c:}' \
+ src/man_db.conf || die
+}
+
+src_install() {
+ default
+ dodoc docs/{HACKING,TODO}
+ prune_libtool_files
+
+ exeinto /etc/cron.daily
+ newexe "${FILESDIR}"/man-db.cron man-db #289884
+}
+
+pkg_preinst() {
+ local cachedir="${EROOT}var/cache/man"
+ # If the system was already exploited, and the attacker is hiding in the
+ # cachedir of the old man-db, let's wipe them out.
+ # see bug #602588 comment 18
+ local _replacing_version=
+ local _setgid_vuln=0
+ for _replacing_version in ${REPLACING_VERSIONS}; do
+ if version_is_at_least '2.7.6.1-r2' "${_replacing_version}"; then
+ debug-print "Skipping security bug #602588 ... existing installation (${_replacing_version}) should not be affected!"
+ else
+ _setgid_vuln=1
+ debug-print "Applying cleanup for security bug #602588"
+ fi
+ done
+ [[ ${_setgid_vuln} -eq 1 ]] && rm -rf "${cachedir}"
+
+ # Fall back to recreating the cachedir
+ if [[ ! -d ${cachedir} ]] ; then
+ mkdir -p "${cachedir}" || die
+ chown man:man "${cachedir}" || die
+ fi
+
+ # Update the whatis cache
+ if [[ -f ${cachedir}/whatis ]] ; then
+ einfo "Cleaning ${cachedir} from sys-apps/man"
+ find "${cachedir}" -type f '!' '(' -name index.bt -o -name index.db ')' -delete
+ fi
+}
+
+pkg_postinst() {
+ if [[ $(get_version_component_range 2 ${REPLACING_VERSIONS}) -lt 7 ]] ; then
+ einfo "Rebuilding man-db from scratch with new database format!"
+ mandb --quiet --create
+ fi
+}