 |
 |
Hey Derek, It seems like I'll have no choice - I tried to re-export the symbols using dlopen and got the dynamic loader to crash :). Still debugging though... RTLD_GLOBAL by default definitely looks dangerous, but we might have to make it an option. Brian On Sep 17, 2010, at 3:08 AM, Derek Feichtinger wrote: > Hi, Brian and all > > Here is a good link suggesting why one should be cautious in using RTLD_GLOBAL on Linux: > http:[log in to unmask] > > Cheers, > Derek > > > On 09/16/10 20:52, Brian Bockelman wrote: >> Hi, >> >> In XrdSysPlugin.cc, dlopen() is only called with the RTLD_NOW option. This is causing problems for something I'm working on. >> >> I'm currently implementing LCMAPS authorization for GSI which needs to: >> >> 1) Load the libXrdLcmaps library (which is linked against liblcmaps) [DONE] >> 2) Call the lcmaps_init function [DONE] >> 3) lcmaps then loads its plugins. For some security reason (which I don't know), the plugins are not linked against liblcmaps itself but use its symbols. >> >> Normally, step (3) is fine because the liblcmaps symbols are in the global namespace. *However*, since xrootd loads liblcmaps without the RTLD_GLOBAL option, the liblcmaps symbols are not available and the dlopen fails at (3). >> >> What's the reasoning behind not passing RTLD_GLOBAL? Or has it just never come up? >> >> Brian >> >> > > > -- > Dr. Derek Feichtinger Tel: +41 56 310 47 33 > AIT / Scientific Computing email: [log in to unmask] > PSI > CH-5232 Villigen PSI >