➜ fuzzer git:(master) ✗ ./clamav_fuzzer clamav.crash.chm
LibClamAV Warning: cli_load: unknown extension - skipping /home/varsleak/.local/share/clamav
=================================================================
==31938==ERROR: AddressSanitizer: heap-buffer-overflow on address 0x631000024800 at pc 0x7f7d8080d904 bp 0x7ffed7e460f0 sp 0x7ffed7e45898
WRITE of size 2003 at 0x631000024800 thread T0
#0 0x7f7d8080d903 in __asan_memcpy (/usr/lib/x86_64-linux-gnu/libasan.so.2+0x8c903)
#1 0x7f7d800404df in mspack_fmap_copy /home/varsleak/github/clamav-devel/libclamav/libmspack.c:272
#2 0x7f7d80368a74 in lzxd_decompress mspack/lzxd.c:777
#3 0x7f7d80352d35 in chmd_extract mspack/chmd.c:1002
#4 0x7f7d800419c4 in cli_scanmschm /home/varsleak/github/clamav-devel/libclamav/libmspack.c:486
#5 0x7f7d7ffaa5d8 in magic_scandesc /home/varsleak/github/clamav-devel/libclamav/scanners.c:2936
#6 0x7f7d7ffad3be in cli_base_scandesc /home/varsleak/github/clamav-devel/libclamav/scanners.c:3230
#7 0x7f7d7ffad516 in cli_magic_scandesc /home/varsleak/github/clamav-devel/libclamav/scanners.c:3239
#8 0x7f7d7ffaeb5c in scan_common /home/varsleak/github/clamav-devel/libclamav/scanners.c:3471
#9 0x7f7d7ffaed2c in cl_scandesc_callback /home/varsleak/github/clamav-devel/libclamav/scanners.c:3589
#10 0x411d36 in scanfile /home/varsleak/github/clamav-devel/clamscan/manager.c:392
#11 0x416f60 in scanmanager /home/varsleak/github/clamav-devel/clamscan/manager.c:1203
#12 0x40f6e4 in main /home/varsleak/github/clamav-devel/clamscan/clamscan.c:161
#13 0x7f7d7f87782f in __libc_start_main (/lib/x86_64-linux-gnu/libc.so.6+0x2082f)
#14 0x403148 in _start (/home/varsleak/.local/bin/clamscan+0x403148)
0x631000024800 is located 0 bytes to the right of 65536-byte region [0x631000014800,0x631000024800)
allocated by thread T0 here:
#0 0x7f7d80819602 in malloc (/usr/lib/x86_64-linux-gnu/libasan.so.2+0x98602)
#1 0x7f7d80040497 in mspack_fmap_alloc /home/varsleak/github/clamav-devel/libclamav/libmspack.c:262
#2 0x7f7d8035f6b0 in lzxd_init mspack/lzxd.c:312
#3 0x7f7d803544f1 in chmd_init_decomp mspack/chmd.c:1158
#4 0x7f7d80352af7 in chmd_extract mspack/chmd.c:990
#5 0x7f7d800419c4 in cli_scanmschm /home/varsleak/github/clamav-devel/libclamav/libmspack.c:486
#6 0x7f7d7ffaa5d8 in magic_scandesc /home/varsleak/github/clamav-devel/libclamav/scanners.c:2936
#7 0x7f7d7ffad3be in cli_base_scandesc /home/varsleak/github/clamav-devel/libclamav/scanners.c:3230
#8 0x7f7d7ffad516 in cli_magic_scandesc /home/varsleak/github/clamav-devel/libclamav/scanners.c:3239
#9 0x7f7d7ffaeb5c in scan_common /home/varsleak/github/clamav-devel/libclamav/scanners.c:3471
#10 0x7f7d7ffaed2c in cl_scandesc_callback /home/varsleak/github/clamav-devel/libclamav/scanners.c:3589
#11 0x411d36 in scanfile /home/varsleak/github/clamav-devel/clamscan/manager.c:392
#12 0x416f60 in scanmanager /home/varsleak/github/clamav-devel/clamscan/manager.c:1203
#13 0x40f6e4 in main /home/varsleak/github/clamav-devel/clamscan/clamscan.c:161
#14 0x7f7d7f87782f in __libc_start_main (/lib/x86_64-linux-gnu/libc.so.6+0x2082f)
SUMMARY: AddressSanitizer: heap-buffer-overflow ??:0 __asan_memcpy
Shadow bytes around the buggy address:
0x0c627fffc8b0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
0x0c627fffc8c0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
0x0c627fffc8d0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
0x0c627fffc8e0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
0x0c627fffc8f0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
=>0x0c627fffc900:[fa]fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa
0x0c627fffc910: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa
0x0c627fffc920: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa
0x0c627fffc930: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa
0x0c627fffc940: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa
0x0c627fffc950: 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
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
==31938==ABORTING