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[Bug ld/22048] New: Incorrect .eh_frame section in libc.so


From: hjl.tools at gmail dot com
Subject: [Bug ld/22048] New: Incorrect .eh_frame section in libc.so
Date: Wed, 30 Aug 2017 21:01:00 +0000

https://sourceware.org/bugzilla/show_bug.cgi?id=22048

            Bug ID: 22048
           Summary: Incorrect .eh_frame section in libc.so
           Product: binutils
           Version: 2.30 (HEAD)
            Status: NEW
          Severity: normal
          Priority: P2
         Component: ld
          Assignee: unassigned at sourceware dot org
          Reporter: hjl.tools at gmail dot com
                CC: amodra at gmail dot com
  Target Milestone: ---

On x86-64, ld with

commit 79a94a2ad1e6e2f227de07427481e4bb8be84504
Author: Alan Modra <address@hidden>
Date:   Mon Aug 14 09:25:17 2017 +0930

    PR21441, Unnecessary padding of .eh_frame section

    Until all .eh_frame sections have been edited we don't know their
    sizes.  So it isn't possible to properly decide whether a non-empty
    .eh_frame section follows a given section until editing is complete.

    bfd/
            PR 21441
            * elf-eh-frame.c (_bfd_elf_discard_section_eh_frame): Don't add
            alignment padding here.
            * elflink.c (bfd_elf_discard_info): Add .eh_frame padding here
            in a reverse pass over sections.
    ld/
            PR 21441
            * testsuite/ld-x86-64/pr21038a.d: Adjust.
            * testsuite/ld-x86-64/pr21038a-now.d: Adjust.

generates incorrect .eh_frame section:

# readelf -wf libc.so /dev/null
readelf: Warning: Invalid CIE pointer 0x00000014 in FDE at 0x020574
readelf: Warning: Invalid length 0x7c000000 in FDE at 0x020579
readelf: Warning: Invalid CIE pointer 0xd8000205 in FDE at 0x020579

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