[Bug binutils/24244] New: readelf: heap buffer overflow in unw_decode_uleb128

[spinpx at gmail dot com]

https://sourceware.org/bugzilla/show_bug.cgi?id=24244

            Bug ID: 24244
           Summary: readelf: heap buffer overflow in unw_decode_uleb128
           Product: binutils
           Version: 2.33 (HEAD)
            Status: UNCONFIRMED
          Severity: normal
          Priority: P2
         Component: binutils
          Assignee: unassigned at sourceware dot org
          Reporter: spinpx at gmail dot com
  Target Milestone: ---

Created attachment 11624
  --> https://sourceware.org/bugzilla/attachment.cgi?id=11624&action=edit
Heap buffer overflow input

- Intel Xeon Gold 5118 processors and 256 GB memory
- Linux n18-065-139 4.19.0-1-amd64 #1 SMP Debian 4.19.12-1 (2018-12-22) x86_64
GNU/Linux
- clang version 4.0.0 (tags/RELEASE_400/final)
- version: commit c72e75a64030b0f6535a80481f37968ad55c333a (Feb 19 2019)
- run: readelf -a input_file

- asan_report:
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 IA-64
  Version:                           0x1
  Entry point address:               0x8048074
  Start of program headers:          52 (bytes into file)
  Start of section headers:          164 (bytes into file)
  Flags:                             0x0
  Size of this header:               52 (bytes)
  Size of program headers:           32 (bytes)
  Number of program headers:         2
  Size of section headers:           40 (bytes)
  Number of section headers:         4
  Section header string table index: 3
readelf: Warning: Section 1 has an out of range sh_link value of 512
readelf: Error: Section 3 has invalid sh_entsize of 0000000000000000
readelf: Error: (Using the expected size of 16 for the rest of this dump)

Section Headers:
  [Nr] Name              Type            Addr     Off    Size   ES Flg Lk Inf
Al
  [ 0] .IA_64.unwind_inf NULL            00000000 000000 000064 1000000      0 
 0 4294967268
  [ 1] nd_info           PROGBITS        08048081 000067 00000c 00  AX 512   0 
4
readelf: Warning: section 1: sh_link value of 512 is larger than the number of
sections
  [ 2] o                 IA_64_UNWIND    00049000 000000 00000c 00  WA  0   0
570425348
readelf: Warning: [ 3]: Link field (0) should index a string section.
=================================================================
==427698==ERROR: AddressSanitizer: heap-buffer-overflow on address
0x60b000003225 at pc 0x0000005871b5 bp 0x7ffdc2270470 sp 0x7ffdc2270468
READ of size 1 at 0x60b000003225 thread T0
    #0 0x5871b4 in unw_decode_uleb128
/mnt/raid/user/chenpeng/FuzzingBench/binutils/binutils-gdb/binutils/unwind-ia64.c:553:14
    #1 0x58464f in unw_decode_r2
/mnt/raid/user/chenpeng/FuzzingBench/binutils/binutils-gdb/binutils/unwind-ia64.c:674:10
    #2 0x58430c in unw_decode
/mnt/raid/user/chenpeng/FuzzingBench/binutils/binutils-gdb/binutils/unwind-ia64.c:1072:10
    #3 0x55fe61 in dump_ia64_unwind
/mnt/raid/user/chenpeng/FuzzingBench/binutils/binutils-gdb/binutils/readelf.c:7519:7
    #4 0x5533a5 in ia64_process_unwind
/mnt/raid/user/chenpeng/FuzzingBench/binutils/binutils-gdb/binutils/readelf.c:7814:6
    #5 0x51a1c6 in process_unwind
/mnt/raid/user/chenpeng/FuzzingBench/binutils/binutils-gdb/binutils/readelf.c:9338:14
    #6 0x505b0d in process_object
/mnt/raid/user/chenpeng/FuzzingBench/binutils/binutils-gdb/binutils/readelf.c:19275:9
    #7 0x4f547d in process_file
/mnt/raid/user/chenpeng/FuzzingBench/binutils/binutils-gdb/binutils/readelf.c:19715:13
    #8 0x4f3ec8 in main
/mnt/raid/user/chenpeng/FuzzingBench/binutils/binutils-gdb/binutils/readelf.c:19774:11
    #9 0x7fa6d20d609a in __libc_start_main
(/lib/x86_64-linux-gnu/libc.so.6+0x2409a)
    #10 0x41d4b9 in _start
(/mnt/raid/user/chenpeng/FuzzingBench/build/asan/install/bin/readelf+0x41d4b9)

0x60b000003225 is located 0 bytes to the right of 101-byte region
[0x60b0000031c0,0x60b000003225)
allocated by thread T0 here:
    #0 0x4c41ac in malloc
/scratch/llvm/clang-4/xenial/final/llvm.src/projects/compiler-rt/lib/asan/asan_malloc_linux.cc:66:3
    #1 0x4f179f in get_data
/mnt/raid/user/chenpeng/FuzzingBench/binutils/binutils-gdb/binutils/readelf.c:426:9
    #2 0x552ff6 in ia64_process_unwind
/mnt/raid/user/chenpeng/FuzzingBench/binutils/binutils-gdb/binutils/readelf.c:7796:33
    #3 0x51a1c6 in process_unwind
/mnt/raid/user/chenpeng/FuzzingBench/binutils/binutils-gdb/binutils/readelf.c:9338:14
    #4 0x505b0d in process_object
/mnt/raid/user/chenpeng/FuzzingBench/binutils/binutils-gdb/binutils/readelf.c:19275:9
    #5 0x4f547d in process_file
/mnt/raid/user/chenpeng/FuzzingBench/binutils/binutils-gdb/binutils/readelf.c:19715:13
    #6 0x4f3ec8 in main
/mnt/raid/user/chenpeng/FuzzingBench/binutils/binutils-gdb/binutils/readelf.c:19774:11
    #7 0x7fa6d20d609a in __libc_start_main
(/lib/x86_64-linux-gnu/libc.so.6+0x2409a)

SUMMARY: AddressSanitizer: heap-buffer-overflow
/mnt/raid/user/chenpeng/FuzzingBench/binutils/binutils-gdb/binutils/unwind-ia64.c:553:14
in unw_decode_uleb128
Shadow bytes around the buggy address:
  0x0c167fff85f0: fa fa fa fa fa fa fd fd fd fd fd fd fd fd fd fd
  0x0c167fff8600: fd fd fd fd fa fa fa fa fa fa fa fa 00 00 00 00
  0x0c167fff8610: 00 00 00 00 00 00 00 00 05 fa fa fa fa fa fa fa
  0x0c167fff8620: fa fa fd fd fd fd fd fd fd fd fd fd fd fd fd fd
  0x0c167fff8630: fa fa fa fa fa fa fa fa 00 00 00 00 00 00 00 00
=>0x0c167fff8640: 00 00 00 00[05]fa fa fa fa fa fa fa fa fa fd fd
  0x0c167fff8650: fd fd fd fd fd fd fd fd fd fd fd fd fa fa fa fa
  0x0c167fff8660: fa fa fa fa fd fd fd fd fd fd fd fd fd fd fd fd
  0x0c167fff8670: fd fd fa fa fa fa fa fa fa fa fd fd fd fd fd fd
  0x0c167fff8680: fd fd fd fd fd fd fd fd fa fa fa fa fa fa fa fa
  0x0c167fff8690: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa
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
  Freed heap region:       fd
  Stack left redzone:      f1
  Stack mid redzone:       f2
  Stack right redzone:     f3
  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
==427698==ABORTING

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