sys-apps/rng-tools: fix a linking problem with USE=pkcs11 #684228

In function init_pkcs11_entropy_source(), there is a call to
ERR_reason_error_string(), which is defined in libcrypto. This causes
linking problems for rng-tools under certain configurations:

$ ./configure --disable-jitterentropy --without-nistbeacon --with-pkcs11
...
$ make
...
gcc -pthread -g -O2 -pthread -o rngd rngd-rngd.o rngd-rngd_entsource.o
    rngd-rngd_linux.o rngd-util.o rngd-rngd_rdrand.o rdrand_asm.o
    rngd-rngd_pkcs11.o librngd.a -lsysfs -lgcrypt -lsysfs -lp11 -lgcrypt
    -lsysfs
/usr/lib/gcc/x86_64-pc-linux-gnu/8.3.0/../../../../x86_64-pc-linux-gnu/bin/ld:
    rngd-rngd_pkcs11.o: undefined reference to symbol
    'ERR_reason_error_string@@OPENSSL_1_1_0'
/usr/lib/gcc/x86_64-pc-linux-gnu/8.3.0/../../../../x86_64-pc-linux-gnu/bin/ld:
    /usr/lib64/libcrypto.so.1.1: error adding symbols: DSO missing from
    command line
collect2: error: ld returned 1 exit status
make[2]: *** [Makefile:609: rngd] Error 1
make[2]: Leaving directory '/tmp/rng-tools'
make[1]: *** [Makefile:888: all-recursive] Error 1
make[1]: Leaving directory '/tmp/rng-tools'
make: *** [Makefile:458: all] Error 2

This symbol is defined in libcrypto:

$ readelf --dyn-syms /usr/lib64/libcrypto.so | grep ERR_reason_error_string
314: 000000000012cf60 155 FUNC GLOBAL DEFAULT 12
    ERR_reason_error_string@@OPENSSL_1_1_0

Linking rngd against libcrypto when pkcs11 is enabled fixes the issue.

Bug: https://github.com/nhorman/rng-tools/pull/61
Closes: https://bugs.gentoo.org/684228
Package-Manager: Portage-2.3.66, Repoman-2.3.12
Signed-off-by: Göktürk Yüksek <gokturk@gentoo.org>

1 files changed, 8 insertions, 0 deletions

diff --git a/sys-apps/rng-tools/rng-tools-6.7.ebuild b/sys-apps/rng-tools/rng-tools-6.7.ebuild
index e674b8de1d30..ca5962d6923d 100644
--- a/sys-apps/rng-tools/rng-tools-6.7.ebuild
+++ b/sys-apps/rng-tools/rng-tools-6.7.ebuild
@@ -45,6 +45,14 @@ PATCHES=(
 
 src_prepare() {
 	echo 'bin_PROGRAMS = randstat' >> contrib/Makefile.am || die
+
+	# rngd_pkcs11.c needs to be linked against -lcrypto #684228
+	# See: https://github.com/nhorman/rng-tools/pull/61
+	if use pkcs11; then
+		sed -e '/rngd_pkcs11.c$/ a rngd_LDADD\t+= -lcrypto' \
+			-i Makefile.am || die
+	fi
+
 	default
 
 	mv README.md README || die