xen (multiboot) binary gets corrupted ELF notes

[Marek Marczykowski-Górecki <marmarek@xxxxxxxxxxxxxxxxxxxxxx>]

Hi,

I'm getting some ELF note issues on multiboot binary
specifically:
xen/xen: ELF 32-bit LSB executable, Intel 80386, version 1 (SYSV), statically 
linked, BuildID[sha1]=f7d2c37a4ad599b268f2f2d94bff3776d12649b3, bad note 
description size 0xc0010001, stripped

readelf additionally says:

    Displaying notes found in: .note
      Owner                Data size    Description
      GNU                  0x00000014   NT_GNU_BUILD_ID (unique build ID 
bitstring)
        Build ID: c5825a0d08edc4d11b1138fedca6b14ce8ba7302
      (NONE)               0x00000004   Unknown note type: (0x00000020)
       description data: 05 00 00 00 
    readelf: xen/xen: Warning: note with invalid namesz and/or descsz found at 
offset 0x34
    readelf: xen/xen: Warning:  type: 0x4, namesize: 0x00554e47, descsize: 
0xc0010001, alignment: 4

Grub doesn't care, but launching such xen with kexec doesn't work.

Initially found when booting Xen via Heads: 
https://openqa.qubes-os.org/tests/60151#step/install_startup/11

Andy says:
> yeah, I've seen the same on XTF
> binutil's recent elf notes for CET compatibility use an unsigned long
> so they're not compatible when we build as 64bit and then re-package as 32
> I think we need to strip all elf notes in mkelf32

-- 
Best Regards,
Marek Marczykowski-Górecki
Invisible Things Lab

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