[Bug dynamic-link/15465] New: LD_DEBUG=symbols crashes when program name is not available

["siddhesh at redhat dot com" <sourceware-bugzilla at sourceware dot org>]

http://sourceware.org/bugzilla/show_bug.cgi?id=15465

             Bug #: 15465
           Summary: LD_DEBUG=symbols crashes when program name is not
                    available
           Product: glibc
           Version: unspecified
            Status: NEW
          Severity: normal
          Priority: P2
         Component: dynamic-link
        AssignedTo: siddhesh@redhat.com
        ReportedBy: siddhesh@redhat.com
    Classification: Unclassified


Running a program with LD_DEBUG=symbols defined may crash if the program
tampers with argc and argv.

Steps to Reproduce:

foo.c:

#include <stdio.h>
#include <string.h>

int
main (int argc, char **argv)
{
  argv[0] = argv[1];
  argc--;

  foo ();
}

foo-lib.c:

void
foo (void)
{
  return; 
}

cc -o foo-lib.so -shared -fPIC foo-lib.c
cc -o foo foo.c ./foo-lib.so
LD_DEBUG=symbols ./foo

Actual Results:

Segfault

Expected Results:

No segfault.

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