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From: "rui314 at gmail dot com" <sourceware-bugzilla@sourceware.org>
To: glibc-bugs@sourceware.org
Subject: [Bug libc/29651] New: glibc can't handle IRELATIVE in .rel.plt only
 on ARM32 and PPC
Date: Tue, 04 Oct 2022 02:39:02 +0000
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https://sourceware.org/bugzilla/show_bug.cgi?id=3D29651

            Bug ID: 29651
           Summary: glibc can't handle IRELATIVE in .rel.plt only on ARM32
                    and PPC
           Product: glibc
           Version: unspecified
            Status: UNCONFIRMED
          Severity: normal
          Priority: P2
         Component: libc
          Assignee: unassigned at sourceware dot org
          Reporter: rui314 at gmail dot com
                CC: drepper.fsp at gmail dot com
  Target Milestone: ---

It looks like glibc is inconsistent in terms of whether it accepts IRELATIVE
relocations in .rel.plt or not. The majority of its ports support it, thoug=
h it
rejects it with the "unexpected PLT reloc type" error on ARM32 and PPC64.

Compare=20

https://sourceware.org/git/?p=3Dglibc.git;a=3Dblob;f=3Dsysdeps/x86_64/dl-ma=
chine.h;h=3D005d089501fa78654e16103de9ec901af7be4ff2;hb=3DHEAD#l530

with

https://sourceware.org/git/?p=3Dglibc.git;a=3Dblob;f=3Dsysdeps/arm/dl-machi=
ne.h;h=3Db0521c15496b9967a1c00a0ca7214bad2337be14;hb=3DHEAD#l498

as an example. ARM doesn't handle R_ARM_IRELATIVE in .rel.plt.

Among the targets that support GNU IFUNC, the following implementations acc=
ept
IRELATIVE relocations in .rel.plt:

  sysdeps/aarch64/dl-machine.h
  sysdeps/i386/dl-machine.h
  sysdeps/s390/s390-32/dl-machine.h
  sysdeps/s390/s390-64/dl-machine.h
  sysdeps/sparc/sparc32/dl-machine.h
  sysdeps/sparc/sparc64/dl-machine.h
  sysdeps/x86_64/dl-machine.h

The following don't:

  sysdeps/arm/dl-machine.h
  sysdeps/powerpc/powerpc64/dl-machine.h

So I guess this is a bug in ARM32 and PPC64 ports of glibc?

--=20
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