[Nasm-bugs] [Bug 3392727] New: stack-use-after-scope on preproc.c:5225

[noreply-nasm at dev.nasm.us]

https://bugzilla.nasm.us/show_bug.cgi?id=3392727

            Bug ID: 3392727
           Summary: stack-use-after-scope on preproc.c:5225
           Product: NASM
           Version: 2.15.xx
          Hardware: PC
                OS: Linux
            Status: OPEN
          Severity: major
          Priority: Medium
         Component: Assembler
          Assignee: nobody at nasm.us
          Reporter: 734222792 at qq.com
                CC: chang.seok.bae at intel.com, gorcunov at gmail.com,
                    hpa at zytor.com, nasm-bugs at nasm.us
     Obtained from: Built from git using configure

Created attachment 411806
  --> https://bugzilla.nasm.us/attachment.cgi?id=411806&action=edit
POC

CMD：
./nasm -f bin POC -o tmp

ASAN：
==18591==ERROR: AddressSanitizer: stack-use-after-scope on address
0x7ffdba9d7890 at pc 0x5595d168d51e bp 0x7ffdba9d7680 sp 0x7ffdba9d7670
WRITE of size 8 at 0x7ffdba9d7890 thread T0
    #0 0x5595d168d51d in expand_mmac_params asm/preproc.c:5225
    #1 0x5595d16a2e0b in pp_tokline asm/preproc.c:6854
    #2 0x5595d16a2e0b in pp_getline asm/preproc.c:6923
    #3 0x5595d1627b5b in assemble_file asm/nasm.c:1723
    #4 0x5595d161ba0d in main asm/nasm.c:714
    #5 0x7fb858db9bf6 in __libc_start_main
(/lib/x86_64-linux-gnu/libc.so.6+0x21bf6)
    #6 0x5595d161de49 in _start (/home/fstark/nasm-nasm-2.15.05/nasm+0x11be49)

Address 0x7ffdba9d7890 is located in stack of thread T0 at offset 416 in frame
    #0 0x5595d168b15f in expand_mmac_params asm/preproc.c:5040

  This frame has 8 object(s):
    [32, 36) 'fst'
    [96, 100) 'lst'
    [160, 168) 'tail'
    [224, 232) 'thead'
    [288, 296) 'ep'
    [352, 360) 'ep'
    [416, 424) 'newlist' <== Memory access at offset 416 is inside this
variable
    [480, 496) 't'
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-use-after-scope asm/preproc.c:5225 in
expand_mmac_params
Shadow bytes around the buggy address:
  0x100037532ec0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
  0x100037532ed0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 f1 f1
  0x100037532ee0: f1 f1 04 f2 f2 f2 f2 f2 f2 f2 04 f2 f2 f2 f2 f2
  0x100037532ef0: f2 f2 00 f2 f2 f2 f2 f2 f2 f2 00 f2 f2 f2 f2 f2
  0x100037532f00: f2 f2 00 f2 f2 f2 f2 f2 f2 f2 00 f2 f2 f2 f2 f2
=>0x100037532f10: f2 f2[f8]f2 f2 f2 f2 f2 f2 f2 00 00 f2 f2 00 00
  0x100037532f20: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
  0x100037532f30: 00 00 00 00 00 00 00 00 00 00 00 00 f1 f1 f1 f1
  0x100037532f40: 04 f2 f2 f2 f2 f2 f2 f2 00 f2 f2 f2 f2 f2 f2 f2
  0x100037532f50: 00 f2 f2 f2 f2 f2 f2 f2 00 f2 f2 f2 f2 f2 f2 f2
  0x100037532f60: 00 f2 f2 f2 f2 f2 f2 f2 00 f2 f2 f2 f2 f2 f2 f2
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
==18591==ABORTING

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