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[Bug ld/14215] New: ld creates bad GNU_RELRO segment

From: hjl.tools at gmail dot com
Subject: [Bug ld/14215] New: ld creates bad GNU_RELRO segment
Date: Sat, 09 Jun 2012 20:16:49 +0000


             Bug #: 14215
           Summary: ld creates bad GNU_RELRO segment
           Product: binutils
           Version: 2.23 (HEAD)
            Status: NEW
          Severity: normal
          Priority: P2
         Component: ld
        AssignedTo: address@hidden
        ReportedBy: address@hidden
    Classification: Unclassified

address@hidden relro-1]$ cat y.s
    .section .got
    .space 0x2a8, 4
    .zero 12
address@hidden relro-1]$ make
as --32  -o y.o y.s
./ld -m elf_i386 -z relro -shared -o y.so y.o
readelf -lW y.so

Elf file type is DYN (Shared object file)
Entry point 0x134
There are 4 program headers, starting at offset 52

Program Headers:
  Type           Offset   VirtAddr   PhysAddr   FileSiz MemSiz  Flg Align
  LOAD           0x000000 0x00000000 0x00000000 0x00134 0x00134 R   0x1000
  LOAD           0x000cf4 0x00001cf4 0x00001cf4 0x0030c 0x0030c RW  0x1000
  DYNAMIC        0x000cf4 0x00001cf4 0x00001cf4 0x00058 0x00058 RW  0x4
  GNU_RELRO      0x000cf4 0x00001cf4 0x00001cf4 0x0030c 0x0030c R   0x1

 Section to Segment mapping:
  Segment Sections...
   00     .hash .dynsym .dynstr 
   01     .dynamic .got .data 
   02     .dynamic 
   03     .dynamic .got .data 
address@hidden relro-1]$ 

.data section is included in GNU_RELRO segment.  The
problem is caused by


It assumes the next 12 bytes after .got must be in .got.plt
section.  But it fails to check if the next section is .got.plt

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