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[Workaround] Gcc 6.4.0 hardened and palemoon-27.6.2
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gengreen
Tux's lil' helper
Tux's lil' helper


Joined: 23 Dec 2017
Posts: 84

PostPosted: Tue Jan 02, 2018 5:09 am    Post subject: [Workaround] Gcc 6.4.0 hardened and palemoon-27.6.2 Reply with quote

Hi,

I found a workaround to build www-client/palemoon available on the overlay

About the config used

Code:
gcc -v


Code:
COLLECT_GCC=gcc
COLLECT_LTO_WRAPPER=/usr/libexec/gcc/x86_64-pc-linux-gnu/6.4.0/lto-wrapper
Target: x86_64-pc-linux-gnu
Configured with: /var/tmp/portage/sys-devel/gcc-6.4.0/work/gcc-6.4.0/configure --host=x86_64-pc-linux-gnu --build=x86_64-pc-linux-gnu --prefix=/usr --bindir=/usr/x86_64-pc-linux-gnu/gcc-bin/6.4.0 --includedir=/usr/lib/gcc/x86_64-pc-linux-gnu/6.4.0/include --datadir=/usr/share/gcc-data/x86_64-pc-linux-gnu/6.4.0 --mandir=/usr/share/gcc-data/x86_64-pc-linux-gnu/6.4.0/man --infodir=/usr/share/gcc-data/x86_64-pc-linux-gnu/6.4.0/info --with-gxx-include-dir=/usr/lib/gcc/x86_64-pc-linux-gnu/6.4.0/include/g++-v6 --with-python-dir=/share/gcc-data/x86_64-pc-linux-gnu/6.4.0/python --enable-languages=c,c++ --enable-obsolete --enable-secureplt --disable-werror --with-system-zlib --enable-nls --without-included-gettext --enable-checking=release --with-bugurl=https://bugs.gentoo.org/ --with-pkgversion='Gentoo Hardened 6.4.0 p1.1' --enable-esp --enable-libstdcxx-time --disable-libstdcxx-pch --enable-shared --enable-threads=posix --enable-__cxa_atexit --enable-clocale=gnu --enable-multilib --with-multilib-list=m32,m64 --disable-altivec --disable-fixed-point --enable-targets=all --disable-libgcj --enable-libgomp --disable-libmudflap --disable-libssp --disable-libcilkrts --enable-libmpx --enable-vtable-verify --enable-libvtv --disable-libquadmath --enable-lto --without-isl --disable-libsanitizer --enable-default-pie --enable-default-ssp
Thread model: posix
gcc version 6.4.0 (Gentoo Hardened 6.4.0 p1.1)


Code:
eix palemoon


Code:
www-client/palemoon
     Available versions:  27[1] {M}~27.5.0^m[2] {M}~27.5.1^m[2] {M}~27.5.1-r1^m[2] {M}~27.6.0^m[2] {M}~27.6.1^m[2] {M}(~)27.6.2^m[2] {alsa dbus debug +devtools ffmpeg +gtk2 -gtk3 jemalloc -necko-wifi +official-branding +optimize pulseaudio shared-js -system-bzip2 -system-libevent -system-libvpx -system-libwebp -system-sqlite -system-zlib threads -valgrind -webrtc CPU_FLAGS_X86="sse sse2" LINGUAS="cs de en_GB es_AR es_ES es_MX fr hu it ko nl pl pt_BR pt_PT ru sv_SE tr zh_CN"}
     Installed versions:  27.6.2^m[2](09:35:19 PM 01/01/2018)(gtk2 optimize system-bzip2 system-libevent system-libvpx system-libwebp system-sqlite system-zlib -alsa -dbus -debug -devtools -ffmpeg -gtk3 -jemalloc -necko-wifi -official-branding -pulseaudio -shared-js -threads -valgrind -webrtc CPU_FLAGS_X86="sse sse2")


Code:
/etc/portage/package.use/www-client


Code:
www-client/palemoon system-zlib system-sqlite system-libwebp system-libvpx system-libevent system-bzip2 -necko-wifi -devtools -official-branding


About the error

Code:
../../build/unix/gold/ld: error: /var/tmp/portage/www-client/palemoon-27.6.2/work/palemoon-27.6.2/o/toolkit/library/../../media/libstagefright/Unified_cpp_media_libstagefright0.o: requires dynamic R_X86_64_PC32 reloc against '_Z13GetDemuxerLogv' which may overflow at runtime; recompile with -fPIC
../../build/unix/gold/ld: error: read-only segment has dynamic relocations
 /var/tmp/portage/www-client/palemoon-27.6.2/work/palemoon-27.6.2/media/libstagefright/binding/MoofParser.cpp:728: error: undefined reference to 'GetDemuxerLog()'
/var/tmp/portage/www-client/palemoon-27.6.2/work/palemoon-27.6.2/media/libstagefright/binding/MoofParser.cpp:735: error: undefined reference to 'GetDemuxerLog()'
/var/tmp/portage/www-client/palemoon-27.6.2/work/palemoon-27.6.2/media/libstagefright/binding/MoofParser.cpp:804: error: undefined reference to 'GetDemuxerLog()'
/var/tmp/portage/www-client/palemoon-27.6.2/work/palemoon-27.6.2/media/libstagefright/binding/MoofParser.cpp:812: error: undefined reference to 'GetDemuxerLog()'


Full build log available here

https://paste.pound-python.org/show/WJ0rtwSGTyUkN0x6O0nz/

The workaround

I would like to say first that is a very dirty hack, but the build will complete without changing any CFLAGS/CXXFLAGS. In my opinion the problem isn't PIE itself but related to
to the code MoofParser.cpp

https://github.com/MoonchildProductions/Pale-Moon/blob/master/media/libstagefright/binding/MoofParser.cpp

Code:
#include "prlog.h"

#ifdef PR_LOGGING
extern PRLogModuleInfo* GetDemuxerLog();

/* Polyfill __func__ on MSVC to pass to the log. */
#ifdef _MSC_VER
#define __func__ __FUNCTION__
#endif

#define STRINGIFY(x) #x
#define TOSTRING(x) STRINGIFY(x)
#define LOG(name, arg, ...) PR_LOG(GetDemuxerLog(), PR_LOG_DEBUG, (TOSTRING(name) "(%p)::%s: " arg, this, __func__, ##__VA_ARGS__))


LOG() is the function that mess the build, which use the lib nspr (prlog.h is part of nspr)

Code:
dev-libs/nspr


The workaround I made is simple, I removed the Log() function of Moonparser.cpp

https://paste.pound-python.org/show/iVRM9xr9d377A89GZMLg/

To make the build working, emerge palemoon and wait at least, until you see

Code:
> Source configured.
>>> Compiling source in
>>> /var/tmp/portage/www-client/palemoon-27.6.2/work/palemoon-27.6.2
>>> ...


Make sure the Moonparser.cpp is available in :

Code:
/var/tmp/portage/www-client/palemoon-27.6.2/work/palemoon-27.6.2/media/libstagefright/binding/MoofParser.cpp


And replace it by the dirty hack I provided

Full success build available here :

https://paste.pound-python.org/show/4rm2CxbWqFEURoqenDpt/

Hope it's helping.

[Moderator edit: changed some [quote] tags to [code] tags to preserve output layout. -Hu]
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fedeliallalinea
Bodhisattva
Bodhisattva


Joined: 08 Mar 2003
Posts: 21683
Location: here

PostPosted: Tue Jan 02, 2018 7:49 am    Post subject: Reply with quote

Here a patch to use with /etc/portage/patches
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gengreen
Tux's lil' helper
Tux's lil' helper


Joined: 23 Dec 2017
Posts: 84

PostPosted: Tue Jan 02, 2018 8:22 am    Post subject: Reply with quote

fedeliallalinea wrote:
Here a patch to use with /etc/portage/patches


Nice thanks for this patch, far more practical.
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