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From: "rui314 at gmail dot com" <sourceware-bugzilla@sourceware.org>
To: glibc-bugs@sourceware.org
Subject: [Bug libc/29662] New: s390 glibc wrongly assumes GOT[0] is _DYNAMIC
Date: Sat, 08 Oct 2022 01:28:19 +0000
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https://sourceware.org/bugzilla/show_bug.cgi?id=3D29662

            Bug ID: 29662
           Summary: s390 glibc wrongly assumes GOT[0] is _DYNAMIC
           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: ---

The following piece of code in glibc/s390-64 assumes that the first entry of
.got is the address of .dynamic. There's no such guarantee in the psABI, so=
 it
is arguably wrong. It just happens that GNU ld does that.

https://sourceware.org/git/?p=3Dglibc.git;a=3Dblob;f=3Dsysdeps/s390/s390-64=
/dl-machine.h;h=3D74be0552dc42246df8ee24f871a2391798e3441b;hb=3DHEAD#l50

We had very similar code for ARM64, but that has been replaced in
https://sourceware.org/git/?p=3Dglibc.git;a=3Dcommitdiff;h=3D43d06ed218fc8b=
e58987bdfd00e21e5720f0b862.
I think we want to do the same thing for s390.

I noticed this issue when porting my mold linker to s390x.

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