[<prev] [next>] [<thread-prev] [day] [month] [year] [list]
Message-Id: <202007210812.06L8Ci5i010126@room101.nl.oracle.com>
Date: Tue, 21 Jul 2020 10:12:44 +0200
From: Casper.Dik@...cle.COM
To: oss-security@...ts.openwall.com
Subject: Re: Perl 5.32.0 mishandling of rpath and runpath tokens
>Hi Everyone,
>
>Perl mishandles rpath tokens $ORIGIN, $LIB and $PLATFORM. Also see
>https://man7.org/linux/man-pages/man8/ld.so.8.html.
>
>Building on Linux or Solaris with LDFLAGS that includes a rpath or runpath:
>
> -Wl,-R,$ORIGIN/../lib -Wl,-R,$HOME/tmp/ok2delete/lib
>
>results in a rpath or runpath similar to below (Solaris is shown):
>
> # From $HOME/perl-5.32.0 directory
> $ elfdump libperl.so | grep PATH
> [10] RUNPATH 0xaf4d
>/../lib:/export/home/jwalton/tmp/ok2delete/lib
> [11] RPATH 0xaf4d
>/../lib:/export/home/jwalton/tmp/ok2delete/lib
>
>Now the interesting thing here is, $ORIGIN was expanded to nothing and
>/../lib is just /lib. And Solaris /lib directory contains old
>libraries, like zLib 1.2.8 and Bzip 1.0.6. zLib 1.2.8 and Bzip 1.0.6
>have CVEs against them. So rather than use the new zLib and Bzip in
>$HOME/tmp/ok2delete/lib, Perl uses the old ones with CVEs in /lib.
The current version shipped with Solaris are zlib 1.2.11 and bzip2 1.0.8.
>Perl stated they won't fix the problem. Also see
>https://github.com/Perl/perl5/issues/17534.
>
>The best workarounds I have found is to run patchelf (Linux) or
>editelf (Solaris) on all programs and libraries after 'make' and
>before 'make check', and after 'make check' and before 'make install'.
>The procedure has to happen twice because Perl rebuilds some things
>after 'make', including some shared objects built during 'make check'.
There is another possible solution on Solaris by setting the following
variables in the environment:
LD_UNSET="-R/../lib" (drops -R/../lib; multiple options can be
given)
LD_OPTIONS='-R$ORIGIN/../lib' (multiple options possible here too)
/tmp$ cc foo.c -o foo -R/fuz -R/bar -R/blah
/tmp$ dump -Lv foo | grep RPATH
[5] RPATH /fuz:/bar:/blah
/tmp$ LD_OPTIONS=-R/foo/bar LD_UNSET="-R/fuz -R/bar" cc foo.c -o foo -R/fuz -R/bar -R/blah
ld: warning: unsetting option '-R/fuz': LD_UNSET directed
ld: warning: unsetting option '-R/bar': LD_UNSET directed
/tmp$ dump -Lv foo | grep RPATH [5] RPATH /foo/bar:/blah
Casper
Powered by blists - more mailing lists
Please check out the
Open Source Software Security Wiki, which is counterpart to this
mailing list.
Confused about mailing lists and their use?
Read about mailing lists on Wikipedia
and check out these
guidelines on proper formatting of your messages.
