[Nasm-bugs] [Bug 3392802] New: stack-use-after-scope asm/preproc.c:5373 in expand_mmac_params

[noreply-nasm at dev.nasm.us]

https://bugzilla.nasm.us/show_bug.cgi?id=3392802

            Bug ID: 3392802
           Summary: stack-use-after-scope asm/preproc.c:5373 in
                    expand_mmac_params
           Product: NASM
           Version: 2.16 (development)
          Hardware: PC
                OS: Linux
            Status: OPEN
          Severity: normal
          Priority: Medium
         Component: Assembler
          Assignee: nobody at nasm.us
          Reporter: 13579and24680 at gmail.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 411848
  --> https://bugzilla.nasm.us/attachment.cgi?id=411848&action=edit
A crashed file find by AFL and minimized by AFL-tmin

compile it with asan :

$ sh autogen.sh;
$ AFL_USE_ASAN=1 ./configure CC=afl-gcc CXX=afl-g++
$ AFL_USE_ASAN=1 make;


execute :

$ ./nasm poc -o /dev/null
=================================================================
==3116641==ERROR: AddressSanitizer: stack-use-after-scope on address
0x7ffc904d1730 at pc 0x55c6554a5251 bp 0x7ffc904d1610 sp 0x7ffc904d1600
WRITE of size 8 at 0x7ffc904d1730 thread T0
    #0 0x55c6554a5250 in expand_mmac_params asm/preproc.c:5373
    #1 0x55c6554b7a5f in pp_tokline asm/preproc.c:7258
    #2 0x55c6554b7a5f in pp_getline asm/preproc.c:7328
    #3 0x55c655436cc2 in assemble_file asm/nasm.c:1723
    #4 0x55c655429c0a in main asm/nasm.c:718
    #5 0x7f429bb9f0b2 in __libc_start_main
(/lib/x86_64-linux-gnu/libc.so.6+0x240b2)
    #6 0x55c65542d56d in _start (/home/a13579and2468/myfuzz/nasm/nasm+0x11b56d)

Address 0x7ffc904d1730 is located in stack of thread T0 at offset 192 in frame
    #0 0x55c6554a30df in expand_mmac_params asm/preproc.c:5188

  This frame has 8 object(s):
    [32, 36) 'fst' (line 5136)
    [48, 52) 'lst' (line 5136)
    [64, 72) 'tail' (line 5189)
    [96, 104) 'thead' (line 5189)
    [128, 136) 'ep' (line 5254)
    [160, 168) 'ep' (line 5272)
    [192, 200) 'newlist' (line 892) <== Memory access at offset 192 is inside
this variable
    [224, 240) 't' (line 5376)
HINT: this may be a false positive if your program uses some custom stack
unwind mechanism, swapcontext or vfork
      (longjmp and C++ exceptions *are* supported)
SUMMARY: AddressSanitizer: stack-use-after-scope asm/preproc.c:5373 in
expand_mmac_params
Shadow bytes around the buggy address:
  0x100012092290: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
  0x1000120922a0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
  0x1000120922b0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
  0x1000120922c0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 f1 f1
  0x1000120922d0: f1 f1 04 f2 04 f2 00 f2 f2 f2 00 f2 f2 f2 00 f2
=>0x1000120922e0: f2 f2 00 f2 f2 f2[f8]f2 f2 f2 00 00 f3 f3 00 00
  0x1000120922f0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
  0x100012092300: 00 00 00 00 00 00 00 00 00 00 00 00 f1 f1 f1 f1
  0x100012092310: f1 f1 04 f2 00 f2 f2 f2 00 f2 f2 f2 f8 f2 f2 f2
  0x100012092320: 00 f2 f2 f2 00 f2 f2 f2 00 06 f3 f3 00 00 00 00
  0x100012092330: 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
  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
  Shadow gap:              cc
==3116641==ABORTING

-- 
You are receiving this mail because:
You are watching all bug changes.
You are on the CC list for the bug.