Created attachment 11503 [details]
binutils-readelf-heap-use-after-free

hi,binutils team. when i use readelf read a elf file,i get a heap-use-after-free bug reported by AddressSanitizer.


# ./binutils/readelf -a binutils-readelf-heap-use-after-free


File: fuzzout/crashes/id:000000,sig:06,src:000022,op:flip1,pos:2021(aaaaaaaaaaaaaaaa)
readelf: Error: Not an ELF file - it has the wrong magic bytes at the start

File: fuzzout/crashes/id:000000,sig:06,src:000022,op:flip1,pos:2021(gethnamaddr.o)
ELF Header:
  Magic:   7f 45 4c 46 02 01 01 00 00 00 00 00 00 00 00 00
  Class:                             ELF64
  Data:                              2's complement, little endian
  Version:                           1 (current)
  OS/ABI:                            UNIX - System V
  ABI Version:                       0
  Type:                              REL (Relocatable file)
  Machine:                           Advanced Micro Devices X86-64
  Version:                           0x1
  Entry point address:               0x0
  Start of program headers:          0 (bytes into file)
  Start of section headers:          551872 (bytes into file)
..................


  694: 0000000000000016     0 SECTION <processor specific>: 15 INTERNAL [<other>: 28]   UND
   695: 0000000000000010     0 COMMON  <processor specific>: 14 HIDDEN  [<other>: 28]   UND
   696: 0000000000000010     0 <processor specific>: 13 <processor specific>: 14 HIDDEN  [<other>: 28]   UND
   697: 0000137000d40012 0x6e00000000 SRELC   <processor specific>: 15 HIDDEN  [<other>: 28]   UND
   698: 000013e000d40012 0x46300000000 <OS specific>: 11 LOCAL  PROTECTED [<other>: 28]   UND
readelf: Warning: local symbol 698 found at index >= .symtab's sh_info value of 662
   699: 0000000000000010     0 <processor specific>: 13 GLOBAL PROTECTED [<other>: 28]   UND
   700: 0000000000000010     0 COMMON  WEAK   PROTECTED [<other>: 28]   UND

No version information found in this file.
readelf: Error: =================================================================
==12436==ERROR: AddressSanitizer: heap-use-after-free on address 0x60700000d8b0 at pc 0x000000460e16 bp 0x7fff617cbf30 sp 0x7fff617cb6e0
READ of size 2 at 0x60700000d8b0 thread T0
    #0 0x460e15  (/root/binutils-2.31/binutils/readelf+0x460e15)
    #1 0x460712  (/root/binutils-2.31/binutils/readelf+0x460712)
    #2 0x46160a  (/root/binutils-2.31/binutils/readelf+0x46160a)
    #3 0x5c4f4e  (/root/binutils-2.31/binutils/readelf+0x5c4f4e)
    #4 0x4fc965  (/root/binutils-2.31/binutils/readelf+0x4fc965)
    #5 0x4ee2f6  (/root/binutils-2.31/binutils/readelf+0x4ee2f6)
    #6 0x7fd145e2c82f  (/lib/x86_64-linux-gnu/libc.so.6+0x2082f)
    #7 0x419078  (/root/binutils-2.31/binutils/readelf+0x419078)

0x60700000d8b0 is located 0 bytes inside of 77-byte region [0x60700000d8b0,0x60700000d8fd)
freed by thread T0 here:
    #0 0x4b9020  (/root/binutils-2.31/binutils/readelf+0x4b9020)
    #1 0x4fc709  (/root/binutils-2.31/binutils/readelf+0x4fc709)
    #2 0x4ee2f6  (/root/binutils-2.31/binutils/readelf+0x4ee2f6)
    #3 0x7fd145e2c82f  (/lib/x86_64-linux-gnu/libc.so.6+0x2082f)

previously allocated by thread T0 here:
    #0 0x4b91a8  (/root/binutils-2.31/binutils/readelf+0x4b91a8)
    #1 0x5ca176  (/root/binutils-2.31/binutils/readelf+0x5ca176)

SUMMARY: AddressSanitizer: heap-use-after-free (/root/binutils-2.31/binutils/readelf+0x460e15)
Shadow bytes around the buggy address:
  0x0c0e7fff9ac0: fa fa fd fd fd fd fd fd fd fd fd fa fa fa fa fa
  0x0c0e7fff9ad0: fd fd fd fd fd fd fd fd fd fd fa fa fa fa fd fd
  0x0c0e7fff9ae0: fd fd fd fd fd fd fd fa fa fa fa fa fd fd fd fd
  0x0c0e7fff9af0: fd fd fd fd fd fd fa fa fa fa fd fd fd fd fd fd
  0x0c0e7fff9b00: fd fd fd fd fa fa fa fa fd fd fd fd fd fd fd fd
=>0x0c0e7fff9b10: fd fa fa fa fa fa[fd]fd fd fd fd fd fd fd fd fd
  0x0c0e7fff9b20: fa fa fa fa fd fd fd fd fd fd fd fd fd fd fa fa
  0x0c0e7fff9b30: fa fa fd fd fd fd fd fd fd fd fd fa fa fa fa fa
  0x0c0e7fff9b40: fd fd fd fd fd fd fd fd fd fa fa fa fa fa fd fd
  0x0c0e7fff9b50: fd fd fd fd fd fd fd fa fa fa fa fa fd fd fd fd
  0x0c0e7fff9b60: fd fd fd fd fd fa fa fa fa fa 00 00 00 00 00 00
Shadow byte legend (one shadow byte represents 8 application bytes):
  Addressable:           00
  Partially addressable: 01 02 03 04 05 06 07
  Heap left redzone:       fa
  Heap right redzone:      fb
  Freed heap region:       fd
  Stack left redzone:      f1
  Stack mid redzone:       f2
  Stack right redzone:     f3
  Stack partial redzone:   f4
  Stack after return:      f5
  Stack use after scope:   f8
  Global redzone:          f9
  Global init order:       f6
  Poisoned by user:        f7
  Container overflow:      fc
  Array cookie:            ac
  Intra object redzone:    bb
  ASan internal:           fe
  Left alloca redzone:     ca
  Right alloca redzone:    cb
==12436==ABORTING