http://d.puremagic.com/issues/show_bug.cgi?id=11171

           Summary: Text relocations in Phobos shared library
           Product: D
           Version: D2
          Platform: All
        OS/Version: Linux
            Status: NEW
          Severity: normal
          Priority: P2
         Component: Phobos
        AssignedTo: nobody@puremagic.com
        ReportedBy: public@dicebot.lv


--- Comment #0 from Dicebot <public@dicebot.lv> 2013-10-04 04:12:14 PDT ---
Have noticed that issue during package maintenance for Arch Linux and reporting by Martin Nowak request. Arch Linux automatically verifies all packages targeting official repos with own `namcap` tool. At some point I have noticed it warning me that `libphobos2.so` has text relocations.

This is how package is built: https://github.com/Dicebot/Arch-PKGBUILDs/blob/master/dmd/PKGBUILD

Essentially it is just `make -f posix.mak MODEL=$_archbits DMD=$srcdir/dmd/src/dmd RELEASE=1`

$ uname -a
Linux vbox-arch-64 3.11.2-1-ARCH #1 SMP PREEMPT Fri Sep 27 07:35:36 CEST
2013 x86_64 GNU/Linux

$ readelf -d /usr/lib/libphobos2.so | grep TEXTREL
 0x0000000000000016 (TEXTREL)            0x0

$ eu-readelf -r /usr/lib/libphobos2.so | wc -l
18615

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--- Comment #1 from Dicebot <public@dicebot.lv> 2013-10-04 04:14:41 PDT ---
P.S. version of shared library in question is https://www.archlinux.org/packages/community/x86_64/libphobos/ , it can be installed at any point by standard package manager (pacman)

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Martin Krejcirik <mk@krej.cz> changed:

           What    |Removed                     |Added
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                 CC|                            |mk@krej.cz


--- Comment #2 from Martin Krejcirik <mk@krej.cz> 2013-10-31 22:43:50 CET ---
Just noticed this too. It makes shared libraries unusable on hardened system
(like grsecurity).

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safety0ff.bugz <safety0ff.bugz@gmail.com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |safety0ff.bugz@gmail.com


--- Comment #3 from safety0ff.bugz <safety0ff.bugz@gmail.com> 2013-10-31 14:55:11 PDT ---
Duplicate of #5278?

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--- Comment #4 from Martin Krejcirik <mk@krej.cz> 2013-10-31 23:07:52 CET ---
(In reply to comment #3)
> Duplicate of #5278?

Likely, but it's not just Gentoo. I use Grsecurity kernel on Debian and get this error:

./prog: error while loading shared libraries: /usr/local/lib/libphobos2.so.0.64: cannot make segment writable for relocation: Permission denied

The only solution is to disable MPROTECT for given exacutable. http://pax.grsecurity.net/docs/mprotect.txt

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--- Comment #5 from safety0ff.bugz <safety0ff.bugz@gmail.com> 2013-10-31 15:10:09 PDT ---
(In reply to comment #4)
> (In reply to comment #3)
> > Duplicate of #5278?
> 
> Likely, but it's not just Gentoo.
I'm aware, it should probably be renamed.

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