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# fontforge -lang=ff -c 'Open($1)' ./poc/strnmatch-in-char.c-global-buffer-overflow.otf
Copyright (c) 2000-2014 by George Williams. See AUTHORS for Contributors.
License GPLv3+: GNU GPL version 3 or later <http://gnu.org/licenses/gpl.html>
with many parts BSD <http://fontforge.org/license.html>. Please read LICENSE.
Based on sources from 09:14 UTC 13-Jun-2017-D.
Based on source from git with hash: b8e5ff8f24955f4d7d59ac73c903cc088b21bdb6
Table 'hmtx' extends beyond end of file and must be ignored.
The PostScript font name "ˇˇˇˇˇˇˇˇˇˇˇˇˇˇˇˇˇˇˇˇ" is invalid.
It should be printable ASCII,
must not contain (){}[]<>%/ or space
and must be shorter than 63 characters
=================================================================
==21426==ERROR: AddressSanitizer: global-buffer-overflow on address 0x000000ff18d8 at pc 0x000000cf4f38 bp 0x7ffda943fc40 sp 0x7ffda943fc30
READ of size 2 at 0x000000ff18d8 thread T0
#0 0xcf4f37 in strnmatch /root/afl_fuzz/project/test/fontforge/Unicode/char.c:73
#1 0x51e847 in readttfcopyrights /root/afl_fuzz/project/test/fontforge/fontforge/parsettf.c:1770
#2 0x51ee2a in readttfpreglyph /root/afl_fuzz/project/test/fontforge/fontforge/parsettf.c:1804
#3 0x545d74 in readttf /root/afl_fuzz/project/test/fontforge/fontforge/parsettf.c:5487
#4 0x552652 in _SFReadTTF /root/afl_fuzz/project/test/fontforge/fontforge/parsettf.c:6266
#5 0x7e8756 in _ReadSplineFont /root/afl_fuzz/project/test/fontforge/fontforge/splinefont.c:1114
#6 0x7ea217 in ReadSplineFont /root/afl_fuzz/project/test/fontforge/fontforge/splinefont.c:1285
#7 0x7ea675 in LoadSplineFont /root/afl_fuzz/project/test/fontforge/fontforge/splinefont.c:1343
#8 0x660df3 in bOpen /root/afl_fuzz/project/test/fontforge/fontforge/scripting.c:1854
#9 0x6b967e in docall /root/afl_fuzz/project/test/fontforge/fontforge/scripting.c:9352
#10 0x6b9f99 in handlename /root/afl_fuzz/project/test/fontforge/fontforge/scripting.c:9463
#11 0x6be15f in term /root/afl_fuzz/project/test/fontforge/fontforge/scripting.c:9707
#12 0x6bf96f in mul /root/afl_fuzz/project/test/fontforge/fontforge/scripting.c:9852
#13 0x6bffcf in add /root/afl_fuzz/project/test/fontforge/fontforge/scripting.c:9897
#14 0x6c0b1b in comp /root/afl_fuzz/project/test/fontforge/fontforge/scripting.c:9972
#15 0x6c1338 in _and /root/afl_fuzz/project/test/fontforge/fontforge/scripting.c:10015
#16 0x6c1871 in _or /root/afl_fuzz/project/test/fontforge/fontforge/scripting.c:10046
#17 0x6c1e41 in assign /root/afl_fuzz/project/test/fontforge/fontforge/scripting.c:10078
#18 0x6c2ff9 in expr /root/afl_fuzz/project/test/fontforge/fontforge/scripting.c:10156
#19 0x6c4ab3 in ff_statement /root/afl_fuzz/project/test/fontforge/fontforge/scripting.c:10365
#20 0x6c5b4f in ProcessNativeScript /root/afl_fuzz/project/test/fontforge/fontforge/scripting.c:10513
#21 0x6c6536 in _CheckIsScript /root/afl_fuzz/project/test/fontforge/fontforge/scripting.c:10605
#22 0x6c675b in CheckIsScript /root/afl_fuzz/project/test/fontforge/fontforge/scripting.c:10642
#23 0x41fa8f in fontforge_main /root/afl_fuzz/project/test/fontforge/fontforgeexe/startnoui.c:113
#24 0x41f705 in main /root/afl_fuzz/project/test/fontforge/fontforgeexe/main.c:39
#25 0x7fd46350282f in __libc_start_main (/lib/x86_64-linux-gnu/libc.so.6+0x2082f)
#26 0x41f618 in _start (/root/afl_fuzz/project/test/fontforge/fontforgeexe/fontforge+0x41f618)
0x000000ff18d8 is located 21 bytes to the right of global variable '*.LC4' defined in 'ustring.c' (0xff18c0) of size 3
'*.LC4' is ascii string '%d'
SUMMARY: AddressSanitizer: global-buffer-overflow /root/afl_fuzz/project/test/fontforge/Unicode/char.c:73 strnmatch
Shadow bytes around the buggy address:
0x0000801f62c0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
0x0000801f62d0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
0x0000801f62e0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
0x0000801f62f0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
0x0000801f6300: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
=>0x0000801f6310: 04 f9 f9 f9 f9 f9 f9 f9 03 f9 f9[f9]f9 f9 f9 f9
0x0000801f6320: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
0x0000801f6330: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
0x0000801f6340: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
0x0000801f6350: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
0x0000801f6360: 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
==21426==ABORTINGTestcase:
https://github.com/gnehsoah/poc/blob/master/fontforge/strnmatch-in-char.c-global-buffer-overflow.otf
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