[Bug tools/28488] phdr[6]: unknown object file note type 32 with owner name '' at offset 48

mark at klomp dot org sourceware-bugzilla@sourceware.org
Fri Oct 22 14:08:39 GMT 2021


--- Comment #7 from Mark Wielaard <mark at klomp dot org> ---
The addr2line binary from comment #4 has two phdr NOTE segments:

$ eu-elflint --quiet --gnu-ld addr2line
phdr[6]: unknown object file note type 32 with owner name '' at offset 48
phdr[6]: extra 72 bytes after last note

$ eu-readelf -l addr2line 
Program Headers:
  Type           Offset   VirtAddr           PhysAddr           FileSiz  MemSiz
  Flg Align
  PHDR           0x000040 0x0000000000400040 0x0000000000400040 0x000230
0x000230 R   0x8
  INTERP         0x000270 0x0000000000400270 0x0000000000400270 0x00001c
0x00001c R   0x1
        [Requesting program interpreter: /lib64/ld-linux-x86-64.so.2]
  LOAD           0x000000 0x0000000000400000 0x0000000000400000 0x0044d0
0x0044d0 R E 0x1000
  LOAD           0x004da8 0x0000000000405da8 0x0000000000405da8 0x000478
0x000530 RW  0x1000
  DYNAMIC        0x004db8 0x0000000000405db8 0x0000000000405db8 0x000210
0x000210 RW  0x8
  NOTE           0x0002b0 0x00000000004002b0 0x00000000004002b0 0x000030
0x000030 R   0x8
  NOTE           0x00028c 0x000000000040028c 0x000000000040028c 0x000078
0x000078 R   0x4
  GNU_EH_FRAME   0x00445c 0x000000000040445c 0x000000000040445c 0x000074
0x000074 R   0x4
  GNU_STACK      0x000000 0x0000000000000000 0x0000000000000000 0x000000
0x000000 RW  0x10
  GNU_RELRO      0x004da8 0x0000000000405da8 0x0000000000405da8 0x000258
0x000258 RW  0x8

 Section to Segment mapping:
  Segment Sections...
   01      [RO: .interp]
   02      [RO: .interp .note.ABI-tag .note.gnu.property .note.gnu.build-id
.dynsym .dynstr .gnu.hash .hash .gnu.version .gnu.version_r .rela.dyn .rela.plt
.init .plt .text .fini .rodata .eh_frame .eh_frame_hdr]
   03      [RELRO: .fini_array .init_array .dynamic .got] <RELRO: .got.plt>
.data .bss
   04      [RELRO: .dynamic]
   05      [RO: .note.gnu.property]
   06      [RO: .note.ABI-tag .note.gnu.property .note.gnu.build-id]
   07      [RO: .eh_frame_hdr]
   09      [RELRO: .fini_array .init_array .dynamic .got]

There are two phdr PT_NOTE segments because they have different alignments (05
has alignment 8 and covers .note.gnu.property, 06 has alignment 8 and covers
the other loaded note sections)

$ eu-readelf -S addr2line | grep note
[ 2] .note.ABI-tag        NOTE         000000000040028c 0000028c 00000020  0 A 
    0   0  4
[ 3] .note.gnu.property   NOTE         00000000004002b0 000002b0 00000030  0 A 
    0   0  8
[ 4] .note.gnu.build-id   NOTE         00000000004002e0 000002e0 00000024  0 A 
    0   0  4
[37] .note.gnu.gold-version NOTE         0000000000000000 00010a98 0000001c  0 
      0   0  4

Neither covers the gold-version (as expected)

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