Issue #15335 has been updated by ioquatix (Samuel Williams).


@vo.x I'm so sorry but I edit your last post rather than creating new one. Now it's changed, I can't revert it back. :(

I've fixed x86 implementation too, now that it was confirmed the previous effort to fix x64 worked as expected. This issue should be completely resolved now (dc6908ab44c3a3fc78319422410b57d3b7fb6c0c / r66341).

----------------------------------------
Bug #15335: Ruby 2.6.0 is not properly fortified
https://bugs.ruby-lang.org/issues/15335#change-75584

* Author: vo.x (Vit Ondruch)
* Status: Closed
* Priority: Normal
* Assignee: ioquatix (Samuel Williams)
* Target version: 
* ruby -v: ruby 2.6.0dev (2018-11-22 trunk 65928) [x86_64-linux]
* Backport: 2.3: UNKNOWN, 2.4: UNKNOWN, 2.5: UNKNOWN
----------------------------------------
For some while, we carry this test in Fedora package [1]:

~~~
checksec -f libruby.so.%{ruby_version} | \	
  grep "Full RELRO.*Canary found.*NX enabled.*DSO.*No RPATH.*No RUNPATH.*Yes.*\d*.*\d*.*libruby.so.%{ruby_version}"
~~~

This should ensure, that the library is properly fortified [2]. This test was passing with preview3, but it started to fail, testing with r65928:

~~~
$ checksec -f libruby.so.2.6.0
WARNING: 'openssl' not found! It's required for most checks.

WARNING: Not all necessary commands found. Some tests might not work!

RELRO           STACK CANARY      NX            PIE             RPATH      RUNPATH	FORTIFY	Fortified Fortifiable  FILE
Full RELRO      Canary found      NX disabled   DSO             No RPATH   No RUNPATH   Yes	16		42	libruby.so.2.6.0
~~~

The `NX disabled` is the difference. Looking at the log, it is definitely not about configuration options. So if I should point finger at something, it seems to me that this must be it:

~~~
... snip ...

assembling coroutine/amd64/Context.s
gcc -I. -I.ext/include/x86_64-linux -I./include -I. -I./enc/unicode/10.0.0 -o coroutine/amd64/Context.o -c coroutine/amd64/Context.s

... snip ...

gcc -shared -Wl,-z,relro -Wl,--as-needed  -Wl,-z,now -specs=/usr/lib/rpm/redhat/redhat-hardened-ld -Wl,-soname,libruby.so.2.6 -fstack-protector-strong  -m64 dln.o localeinit.o loadpath.o array.o ast.o bignum.o class.o compar.o compile.o complex.o cont.o debug.o debug_counter.o dir.o dln_find.o encoding.o enum.o enumerator.o error.o eval.o file.o gc.o hash.o inits.o io.o iseq.o load.o marshal.o math.o mjit.o mjit_compile.o node.o numeric.o object.o pack.o parse.o proc.o process.o random.o range.o rational.o re.o regcomp.o regenc.o regerror.o regexec.o regparse.o regsyntax.o ruby.o safe.o signal.o sprintf.o st.o strftime.o string.o struct.o symbol.o thread.o time.o transcode.o transient_heap.o util.o variable.o version.o vm.o vm_backtrace.o vm_dump.o vm_trace.o coroutine/amd64/Context.o probes.o enc/ascii.o enc/us_ascii.o enc/unicode.o enc/utf_8.o enc/trans/newline.o setproctitle.o strlcat.o strlcpy.o addr2line.o  prelude.o dmyext.o dmyenc.o -lpthread -lrt -lrt -lgmp -ldl -lcrypt -lm  
  -o libruby.so.2.6.0

... snip ...
~~~

I.e. the coroutines assembly. Not sure how to prove it nor fix it.



[1]: https://src.fedoraproject.org/rpms/ruby/blob/c80ecd9db905f328079a9c8afee70a34e1dcc18c/f/ruby.spec#_735
[2]: https://fedoraproject.org/wiki/Changes/Harden_All_Packages#How_To_Test



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