Date: Mon, 5 Oct 2009 08:29:37 +0100 From: Doug Rabson <dfr@rabson.org> To: Alexander Nedotsukov <bland@FreeBSD.org> Cc: Doug Rabson <dfr@FreeBSD.org>, Rick Macklem <rmacklem@uoguelph.ca>, John Baldwin <john@baldwin.cx>, freebsd-current@FreeBSD.org, John Marshall <john.marshall@riverwillow.com.au>, George Mamalakis <mamalos@eng.auth.gr> Subject: Re: 8.0 Dynamic Linker Broken? (Was: [PATCH] SASL problems with spnego on 8.0-BETA4) Message-ID: <0EA2E119-29DF-4DDE-84C3-432E35D61C76@rabson.org> In-Reply-To: <54ee35ff63fa25ea4c082134892835fb@mail> References: <54ee35ff63fa25ea4c082134892835fb@mail>
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This is the core of the problem, I think. There are two possible solutions: 1. Link libgssapi_foo.so against libgssapi.so. I'm not a fan of this because it will encourage people to link with libgssapi_krb5.so when they really ought to be linking with libgssapi.so to give them mechanism independance. 2. Split the various mechanism libs in to two parts, mech_foo.so which will contain the actual mechanism implementation (this can link with libgssapi.so to handle the RTLD_LOCAL issue) and optionally libgssapi_foo.so to contain any mechanism-specific extensions. Clearly (2) is unsuitable for 8.0 but could happen in current. I guess we could use (1) as a band-aid fix for 8.0. On 5 Oct 2009, at 05:50, Alexander Nedotsukov wrote: > > Actually this may mean quite otherwise. > What I saying is if some code (eg. libsasl) dlopen() libgssapi as > RTLD_LOCAL then later attempt to load libgssapi_xxx inside libgssapi > may > fail because of this: > > $ldd /usr/lib/libgssapi_spnego.so > /usr/lib/libgssapi_spnego.so: > libasn1.so.10 => /usr/lib/libasn1.so.10 (0x28300000) > libc.so.7 => /lib/libc.so.7 (0x2808f000) > > I would expect to see libgssapi.so.10 dependency here. > > On Mon, 5 Oct 2009 10:07:20 +1100, John Marshall > <john.marshall@riverwillow.com.au> wrote: >> On Fri, 02 Oct 2009, 08:24 -0400, John Baldwin wrote: >>> On Friday 02 October 2009 4:13:19 am John Marshall wrote: >>>> On Tue, 22 Sep 2009, 08:22 +1000, John Marshall wrote: >>>>> On Mon, 21 Sep 2009, 11:26 -0400, Rick Macklem wrote: >>>>> >> [snip] >>>>>> >>>>>> Now, hopefully someone who understands enough about dynamic >>>>>> linking will >>>>>> know if this is the correct fix for 8.0? (I'm going on a couple > of >>>>>> weeks >>>>>> vacation at the end of this week, so I won't be around to commit >>>>>> anything >>>>>> and don't understand it well enough to know if this is the > correct >>>>>> way >>>>>> to fix it.) >>>>>> >>>>>> So, hopefully someone else can pick this one up? >>>>>> >> [snip] >>>>> >>>>> I have submitted a patch to the FreeBSD Makefile which patches the >>>>> vendor-supplied template for krb5-config. I should be grateful if >>>>> dfr@ >>>>> or another src committer would please review this with a view to >>>>> obtaining re@ approval to commit it before 8.0-RC2. >>>>> >>>>> <http://www.freebsd.org/cgi/query-pr.cgi?pr=139037>; >>>> >>>> Any src committers able to help with this? >>> >>> Hmmm, I thought that libgssapi was supposed to use dlopen to load >>> the >>> proper >>> back-end libraries using /etc/gss/mech rather than having >>> applications >>> directly link against them. >> >> OK, so if my proposed solution is, in fact, only masking a symptom >> of a >> broken dynamic linker, would somebody who understands this stuff >> please >> weigh in on this with some debugging suggestions or with a patch to >> address this problem? >> >> I'm able to help with testing but I'm not a programmer and know >> nothing >> about the FreeBSD dynamic linker. >> >> Thanks.
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