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[Bug dynamic-link/14293] New: dlopen with non-existing RUNPATH causes double free


http://sourceware.org/bugzilla/show_bug.cgi?id=14293

             Bug #: 14293
           Summary: dlopen with non-existing RUNPATH causes double free
           Product: glibc
           Version: unspecified
            Status: NEW
          Severity: normal
          Priority: P2
         Component: dynamic-link
        AssignedTo: unassigned@sourceware.org
        ReportedBy: joamaki@gmail.com
    Classification: Unclassified


Created attachment 6479
  --> http://sourceware.org/bugzilla/attachment.cgi?id=6479
Backtrace for test program

When calling dlopen with an executable with RUNPATH section
pointing to a non-existing path and LD_LIBRARY_PATH pointing to /lib
the application crashes due to a double free in open_path (elf/dl-load.c).

This was actually causing a production application to crash due to
some silly sod setting the LD_LIBRARY_PATH to /lib in startup scripts :-).

Attached is a backtrace for the following test program:
--
#include <dlfcn.h>

/**
 * gcc dlopen_bug.c -o dlopen_bug -ldl -Wl,-rpath,/nonexisting_path
-Wl,--enable-new-dtags -g
 *
 * Run with:
 * LD_LIBRARY_PATH=/lib ./dlopen_bug
 * 
 * Replace /lib with path to directory containing ld.so,
 * e.g. /lib/x86_64-linux-gnu on Debian/Ubuntu.
 */

int main()
{
    dlopen("nonexisting.so", RTLD_LAZY);
}
--

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