[Bug gas/5900] New: ELF files with more than 65536 sections not handled correctly.

[ian at airs dot com]

Use this script to create an C/C++ file which will have more than 65536 
sections:

for i in `seq 1 70000`; do
  echo "int var_$i __attribute__((section(\"section_$i\"))) = $i;"
done

Compile it.  Run readelf -S on the resulting object file.  Note section 0:

  [ 0]                   NULL             0000000000000000  00000000
       000000000001117a  0000000000000000          70262     0     0

When there are more than 65536 sections, the ELF spec says that sh_size should
hold the number of sections.  When the section string table index is more than
0xff00, it should be in the sh_link field.  Here we see that sh_size is 0x1117a
== 70010.  sh_link is 70262.  This does not make sense as 70262 > 70010.

What is happening is that whenever BFD needs to store a section index larger
than 0xff00, it stores the section number plus 256.  Thus in this case the
section string table index is really 70262 - 256 == 70006.

BFD is self-consistent, and readelf is consistent with what BFD generates.  But
the output does not follow the ELF spec.

-- 
           Summary: ELF files with more than 65536 sections not handled
                    correctly.
           Product: binutils
           Version: 2.16
            Status: NEW
          Severity: normal
          Priority: P2
         Component: gas
        AssignedTo: unassigned at sources dot redhat dot com
        ReportedBy: ian at airs dot com
                CC: bug-binutils at gnu dot org


http://sourceware.org/bugzilla/show_bug.cgi?id=5900

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