AddressSanitizer

fancy.log

$ sudo !!
sudo ./laf 
[sudo] password for osaka: 
[>] Allowing traffic to 443
 from *
[>] Allowing traffic to 80
 from *
[>] Allowing traffic to *
 from 127.0.1.1
[>] Allowing traffic to *
 from 127.0.0.1
[>] Allowing traffic to *
 from 192.168.0.1
[#] Opening library handle.
[#] Unbinding existing nf_queue handler for AF_INET (if any).
[#] Binding nfnetlink_queue as nf_queue handler for AF_INET.
[#] Binding this socket to queue '0'.
[#] Setting copy_packet mode.
=================================================================
==8015==ERROR: AddressSanitizer: stack-buffer-overflow on address 0x7ffe563a9a70 at pc 0x7fec6f6cffbc bp 0x7ffe563a9210 sp 0x7ffe563a8998
WRITE of size 513 at 0x7ffe563a9a70 thread T0
    #0 0x7fec6f6cffbb  (/usr/lib/x86_64-linux-gnu/libasan.so.3+0x4bfbb)
    #1 0x7fec6f6d0eb0 in __interceptor___isoc99_vsscanf (/usr/lib/x86_64-linux-gnu/libasan.so.3+0x4ceb0)
    #2 0x7fec6f6d0fc2 in __isoc99_sscanf (/usr/lib/x86_64-linux-gnu/libasan.so.3+0x4cfc2)
    #3 0x55a5fb52663e in net_to_pid_name /home/osaka/code/LAF/src/procs.c:81
    #4 0x55a5fb5247cf in process_pkt /home/osaka/code/LAF/src/main.c:252
    #5 0x55a5fb5259ec in cb /home/osaka/code/LAF/src/main.c:375
    #6 0x7fec6f47eeba  (/usr/lib/x86_64-linux-gnu/libnetfilter_queue.so.1+0x1eba)
    #7 0x7fec6d650356 in nfnl_handle_packet (/usr/lib/x86_64-linux-gnu/libnfnetlink.so.0+0x3356)
    #8 0x55a5fb52611e in main /home/osaka/code/LAF/src/main.c:483
    #9 0x7fec6e3be3f0 in __libc_start_main (/lib/x86_64-linux-gnu/libc.so.6+0x203f0)
    #10 0x55a5fb523339 in _start (/home/osaka/code/LAF/src/laf+0x7339)

Address 0x7ffe563a9a70 is located in stack of thread T0 at offset 1632 in frame
    #0 0x55a5fb52633f in net_to_pid_name /home/osaka/code/LAF/src/procs.c:50

  This frame has 16 object(s):
    [32, 36) 'd'
    [96, 100) 'uid'
    [160, 164) 'timeout'
    [224, 228) 'local_port'
    [288, 292) 'rem_port'
    [352, 356) 'timer_run'
    [416, 420) 'state'
    [480, 488) 'inode'
    [544, 552) 'rxq'
    [608, 616) 'txq'
    [672, 680) 'time_len'
    [736, 744) 'retr'
    [800, 928) 'rem_addr'
    [960, 1088) 'local_addr'
    [1120, 1632) 'more'
    [1664, 2688) 'line' <== Memory access at offset 1632 partially underflows this variable
HINT: this may be a false positive if your program uses some custom stack unwind mechanism or swapcontext
      (longjmp and C++ exceptions *are* supported)
SUMMARY: AddressSanitizer: stack-buffer-overflow (/usr/lib/x86_64-linux-gnu/libasan.so.3+0x4bfbb) 
Shadow bytes around the buggy address:
  0x10004ac6d2f0: 00 00 00 00 00 00 f2 f2 f2 f2 00 00 00 00 00 00
  0x10004ac6d300: 00 00 00 00 00 00 00 00 00 00 f2 f2 f2 f2 00 00
  0x10004ac6d310: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
  0x10004ac6d320: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
  0x10004ac6d330: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
=>0x10004ac6d340: 00 00 00 00 00 00 00 00 00 00 00 00 00 00[f2]f2
  0x10004ac6d350: f2 f2 00 00 00 00 00 00 00 00 00 00 00 00 00 00
  0x10004ac6d360: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
  0x10004ac6d370: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
  0x10004ac6d380: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
  0x10004ac6d390: 00 00 00 00 00 00 00 00 00 00 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
==8015==ABORTING