Undefined reference to SSL_CONF_CTX_new on android x86

David Demelier

@Pablo-J.-Rogina said in Undefined reference to SSL_CONF_CTX_new on android x86:

So you need to make sure that the OpenSSL shared objects (i.e. libssl.so and libcrypto.so) with the proper symbols you're showing are indeed used/available in the emulator environment

Yes, they are copied with QMake:

ANDROID_PACKAGE_SOURCE_DIR = $$PWD/android

contains(ANDROID_TARGET_ARCH,armeabi-v7a) {
    ANDROID_EXTRA_LIBS = \
        /home/markand/Dev/save-the-ball/../../android/env/android-21/armeabi-v7a/lib/libcrypto.so \
        $$PWD/../../android/env/android-21/armeabi-v7a/lib/libssl.so
}

contains(ANDROID_TARGET_ARCH,x86) {
    ANDROID_EXTRA_LIBS = \
        /home/markand/Dev/save-the-ball/../../android/env/android-21/x86/lib/libcrypto.so \
        $$PWD/../../android/env/android-21/x86/lib/libssl.so
}

And present in the android-build directory:

$ ls android-build/libs/x86/lib{crypto,ssl}*
android-build/libs/x86/libcrypto.so  android-build/libs/x86/libssl.so

SGaist

Hi,

Might be a silly question but are you sure you are using your own build of Qt for Android ?

The error message states that it dries to dlopen the .dll which is the default behaviour and not what I'd expect when using a build with the --openssl-linked option.

David Demelier

@SGaist said in Undefined reference to SSL_CONF_CTX_new on android x86:

Might be a silly question but are you sure you are using your own build of Qt for Android ?

The error message states that it dries to dlopen the .dll which is the default behaviour and not what I'd expect when using a build with the --openssl-linked option.

Yes, that's why I don't understand it tries to dlopen, I've configured using -openssl-linked and the configure script definitely says that it's configured as well:

[...]
Qt Network:
  getifaddrs() ........................... no
  IPv6 ifname ............................ no
  libproxy ............................... no
  Linux AF_NETLINK ....................... yes
  OpenSSL ................................ yes
    Qt directly linked to OpenSSL ........ yes
  OpenSSL 1.1 ............................ no
  SCTP ................................... no
  Use system proxies ..................... yes
[...]

The libQt5Network.so also reports requirements on libssl.so and libcrypto.so:

$ readelf -d ~/android/env/android-21/x86/lib/libQt5Network.so | grep NEEDED
 0x00000001 (NEEDED)                     Shared library: [libQt5Core.so]
 0x00000001 (NEEDED)                     Shared library: [libgnustl_shared.so]
 0x00000001 (NEEDED)                     Shared library: [liblog.so]
 0x00000001 (NEEDED)                     Shared library: [libdl.so]
 0x00000001 (NEEDED)                     Shared library: [libz.so]
 0x00000001 (NEEDED)                     Shared library: [libssl.so]
 0x00000001 (NEEDED)                     Shared library: [libcrypto.so]
 0x00000001 (NEEDED)                     Shared library: [libstdc++.so]
 0x00000001 (NEEDED)                     Shared library: [libm.so]
 0x00000001 (NEEDED)                     Shared library: [libc.so]

By the way, we looked at the dlopen wrong, it's the dlopen of libQt5Network.so that triggers the error, not Qt loading openssl.

See:

E/art     ( 2294): dlopen("/data/data/fr.fetacorp.SaveTheBall/lib/libQt5Network.so", RTLD_LAZY) failed: dlopen failed: cannot locate symbol "SSL_CONF_CTX_new" referenced by "libQt5Network.so"...

SGaist

Then another silly question, are you sure you are bundling the x86 version of OpenSSL with that build of your application ?

David Demelier

@SGaist said in Undefined reference to SSL_CONF_CTX_new on android x86:

Then another silly question, are you sure you are bundling the x86 version of OpenSSL with that build of your application ?

Yes:

$ file android-build/libs/x86/*
android-build/libs/x86/gdbserver:                                                    ELF 32-bit LSB executable, Intel 80386, version 1 (SYSV), statically linked, stripped
android-build/libs/x86/libcrypto.so:                                                 ELF 32-bit LSB shared object, Intel 80386, version 1 (SYSV), dynamically linked, stripped
android-build/libs/x86/libgdbserver.so:                                              ELF 32-bit LSB executable, Intel 80386, version 1 (SYSV), statically linked, stripped
android-build/libs/x86/libgnustl_shared.so:                                          ELF 32-bit LSB shared object, Intel 80386, version 1 (SYSV), dynamically linked, stripped
android-build/libs/x86/libplugins_bearer_libqandroidbearer.so:                       ELF 32-bit LSB shared object, Intel 80386, version 1 (SYSV), dynamically linked, stripped
android-build/libs/x86/libplugins_imageformats_libqgif.so:                           ELF 32-bit LSB shared object, Intel 80386, version 1 (SYSV), dynamically linked, stripped
android-build/libs/x86/libplugins_imageformats_libqicns.so:                          ELF 32-bit LSB shared object, Intel 80386, version 1 (SYSV), dynamically linked, stripped
android-build/libs/x86/libplugins_imageformats_libqico.so:                           ELF 32-bit LSB shared object, Intel 80386, version 1 (SYSV), dynamically linked, stripped
android-build/libs/x86/libplugins_imageformats_libqjpeg.so:                          ELF 32-bit LSB shared object, Intel 80386, version 1 (SYSV), dynamically linked, stripped
android-build/libs/x86/libplugins_imageformats_libqtga.so:                           ELF 32-bit LSB shared object, Intel 80386, version 1 (SYSV), dynamically linked, stripped
android-build/libs/x86/libplugins_imageformats_libqtiff.so:                          ELF 32-bit LSB shared object, Intel 80386, version 1 (SYSV), dynamically linked, stripped
android-build/libs/x86/libplugins_imageformats_libqwbmp.so:                          ELF 32-bit LSB shared object, Intel 80386, version 1 (SYSV), dynamically linked, stripped
android-build/libs/x86/libplugins_imageformats_libqwebp.so:                          ELF 32-bit LSB shared object, Intel 80386, version 1 (SYSV), dynamically linked, stripped
android-build/libs/x86/libplugins_platforms_android_libqtforandroid.so:              ELF 32-bit LSB shared object, Intel 80386, version 1 (SYSV), dynamically linked, stripped
android-build/libs/x86/libplugins_sensorgestures_libqtsensorgestures_plugin.so:      ELF 32-bit LSB shared object, Intel 80386, version 1 (SYSV), dynamically linked, stripped
android-build/libs/x86/libplugins_sensorgestures_libqtsensorgestures_shakeplugin.so: ELF 32-bit LSB shared object, Intel 80386, version 1 (SYSV), dynamically linked, stripped
android-build/libs/x86/libplugins_sensors_libqtsensors_android.so:                   ELF 32-bit LSB shared object, Intel 80386, version 1 (SYSV), dynamically linked, stripped
android-build/libs/x86/libplugins_sensors_libqtsensors_generic.so:                   ELF 32-bit LSB shared object, Intel 80386, version 1 (SYSV), dynamically linked, stripped
android-build/libs/x86/libplugins_styles_libqandroidstyle.so:                        ELF 32-bit LSB shared object, Intel 80386, version 1 (SYSV), dynamically linked, stripped
android-build/libs/x86/libQt5Core.so:                                                ELF 32-bit LSB shared object, Intel 80386, version 1 (SYSV), dynamically linked, for GNU/Linux 2.6.28, stripped
android-build/libs/x86/libQt5Gui.so:                                                 ELF 32-bit LSB shared object, Intel 80386, version 1 (SYSV), dynamically linked, stripped
android-build/libs/x86/libQt5Network.so:                                             ELF 32-bit LSB shared object, Intel 80386, version 1 (SYSV), dynamically linked, stripped
android-build/libs/x86/libQt5Sensors.so:                                             ELF 32-bit LSB shared object, Intel 80386, version 1 (SYSV), dynamically linked, stripped
android-build/libs/x86/libQt5Widgets.so:                                             ELF 32-bit LSB shared object, Intel 80386, version 1 (SYSV), dynamically linked, stripped
android-build/libs/x86/libsave-the-ball.so:                                          ELF 32-bit LSB shared object, Intel 80386, version 1 (SYSV), dynamically linked, stripped
android-build/libs/x86/libssl.so:                                                    ELF 32-bit LSB shared object, Intel 80386, version 1 (SYSV), dynamically linked, stripped

Note: no questions are silly, anyone is free to make a mistake :-)

sierdzio

It is possible that Android loads system OpenSSL first and that one is too old to handle your calls. Try linking OpenSSL statically (or use wrapper like OpenSSL documentation recommends).

David Demelier

@sierdzio said in Undefined reference to SSL_CONF_CTX_new on android x86:

It is possible that Android loads system OpenSSL first and that one is too old to handle your calls. Try linking OpenSSL statically (or use wrapper like OpenSSL documentation recommends).

Do you mean building Qt with static linking to OpenSSL?

sierdzio

@David-Demelier said in Undefined reference to SSL_CONF_CTX_new on android x86:

Do you mean building Qt with static linking to OpenSSL?

yes

David Demelier

Okay it works, I have a warning at runtime but I think it can be safely ignored:

I/ActivityManager( 1486): Start proc fr.test.SaveTheBall for activity fr.fetacorp.SaveTheBall/org.qtproject.qt5.android.bindings.QtActivity: pid=2435 uid=10053 gids={50053, 9997, 3003, 1028, 1015} abi=x86
I/QtCore  ( 2435): Start
W/linker  ( 2435): libQt5Network.so has text relocations. This is wasting memory and prevents security hardening. Please fix.

Thanks for all suggestions!

David Demelier

Oh, bad news, starting with android-23 platform it's forbidden to have text relocations so I'll need to find a solution:

https://android-developers.googleblog.com/2016/06/android-changes-for-ndk-developers.html