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Bug in "readelf"

From: Ashwin Agrawal
Subject: Bug in "readelf"
Date: Sat, 27 Dec 2003 10:19:44 +0000 (GMT)

Respected Sir,
              The readelf produces buggy output for the attached elf file ("Input").
     The output it gives is.......
ELF Header:
  Magic:   7f 45 4c 46 01 01 01 00 00 00 00 00 00 00 00 00
  Class:                             ELF32
  Data:                              2's complement, little endian
  Version:                           1 (current)
  OS/ABI:                            UNIX - System V
  ABI Version:                       0
  Type:                              EXEC (Executable file)
  Machine:                           Intel 80386
  Version:                           0x1
  Entry point address:               0x4011b0
  Start of program headers:          52 (bytes into file)
  Start of section headers:          0 (bytes into file)
  Flags:                             0x0
  Size of this header:               52 (bytes)
  Size of program headers:           32 (bytes)
  Number of program headers:         5
  Size of section headers:           0 (bytes)
  Number of section headers:         0
  Section header string table index: 0
There are no sections in this file.
Program Headers:
  Type           Offset   VirtAddr   PhysAddr   FileSiz MemSiz  Flg Align
  PHDR           0x000034 0x003ff82c 0x003ff82c 0x000a0 0x000a0 R E 0x4
  INTERP         0x0000d4 0x003ff8cc 0x003ff8cc 0x00013 0x00013 R   0x1
      [Requesting program interpreter: /lib/ld-linux.so.2]
  LOAD           0x000000 0x003ff7f8 0x003ff7f8 0x24808 0x24808 R E 0x1000
  LOAD           0x024808 0x00424000 0x00424000 0x03200 0x03200 RW  0x1000
  DYNAMIC        0x026808 0x004240c8 0x004240c8 0x000c8 0x000c8 RW  0x4
Dynamic segment at offset 0x26808 contains 14 entries:
  Tag        Type                         Name/Value
 0x00000001 (NEEDED)                     Shared library: []
 0x00000004 (HASH)                       0x3ff8e0
 0x00000005 (STRTAB)                     0x400840
 0x00000006 (SYMTAB)                     0x400520
 0x0000000a (STRSZ)                      748 (bytes)
 0x0000000b (SYMENT)                     22 (bytes)
 0x00000003 (PLTGOT)                     0x4260c8
 0x00000002 (PLTRELSZ)                   392 (bytes)
 0x00000014 (PLTREL)                     REL
 0x00000017 (JMPREL)                     0x400b58
 0x6ffffffe (VERNEED)                    0x400b38
 0x6fffffff (VERNEEDNUM)                 1
 0x6ffffff0 (VERSYM)                     0x400b2c
 0x00000000 (NULL)                       0x0
There are no relocations in this file.
There are no unwind sections in this file.
Histogram for bucket list length (total of 0 buckets):
 Length  Number     % of total  Coverage
No version information found in this file.
             Problems are....
     [1] Does not give Shared Library name which is "kernel32.dll.so" at index 1 in .dynstr which starts offset 0x01048 (0x400840-0x003ff7f8)
     [2] Do not display histogram information in reality file contains 10 buckets as mentioned in the hash table which starts at offset 0x0e8 
     [3] Program represented by the "Input" elf file produces segmentation fault when executed.
              Segmentation Fault (SEGSV Signal)

                      Kindly, findout the reasons for the stated problems and report the solutions to overcome those. Also, can you provide the source of readelf so that we can try to findout the solution to the problems. If there are problems in the "Input" about the Format lets know and if possible provide with the repaired file.

                      Thank you



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Attachment: Input.zip
Description: Input.zip

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