Hi,
I am trying to find out Heartbleed bug from a vulnerable version of openssl
and getting this output from ASAN,
==74031== ERROR: AddressSanitizer: unknown-crash on address 0x60820001220b
at pc 0x7f8b608c53f7 bp 0x7ffff00b49d0 sp 0x7ffff00b4190
READ of size 32768 at 0x60820001220b thread T0
#0 0x7f8b608c53f6 (/usr/lib/x86_64-linux-gnu/libasan.so.0.0.0+0xe3f6)
#1 0x410dfd
(/home/aneela/Documents/Fuzzing_with_afl_fuzz/selftls-master/selftls+0x410dfd)
#2 0x495eb4
(/home/aneela/Documents/Fuzzing_with_afl_fuzz/selftls-master/selftls+0x495eb4)
#3 0x4998f3
(/home/aneela/Documents/Fuzzing_with_afl_fuzz/selftls-master/selftls+0x4998f3)
#4 0x46105d
(/home/aneela/Documents/Fuzzing_with_afl_fuzz/selftls-master/selftls+0x46105d)
#5 0x470193
(/home/aneela/Documents/Fuzzing_with_afl_fuzz/selftls-master/selftls+0x470193)
#6 0x40256e
(/home/aneela/Documents/Fuzzing_with_afl_fuzz/selftls-master/selftls+0x40256e)
#7 0x7f8b6030eec4 (/lib/x86_64-linux-gnu/libc-2.19.so+0x21ec4)
#8 0x4029dc
(/home/aneela/Documents/Fuzzing_with_afl_fuzz/selftls-master/selftls+0x4029dc)
0x608200016348 is located 0 bytes to the right of 16712-byte region
[0x608200012200,0x608200016348)
allocated by thread T0 here:
#0 0x7f8b608cc41a (/usr/lib/x86_64-linux-gnu/libasan.so.0.0.0+0x1541a)
#1 0x4c3d76
(/home/aneela/Documents/Fuzzing_with_afl_fuzz/selftls-master/selftls+0x4c3d76)
Shadow bytes around the buggy address:
0x0c10bfffa3f0: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa
0x0c10bfffa400: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa
0x0c10bfffa410: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa
0x0c10bfffa420: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa
0x0c10bfffa430: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa
=>0x0c10bfffa440: 00[00]00 00 00 00 00 00 00 00 00 00 00 00 00 00
0x0c10bfffa450: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
0x0c10bfffa460: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
0x0c10bfffa470: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
0x0c10bfffa480: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
0x0c10bfffa490: 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 righ 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
ASan internal: fe
==74031== ABORTING
I dont know how to make sense of this output. Is this the output ASAN will
give me or I am missing any parameter to set while compiling.
I have used afl-gcc to compile my program with AFL_USE_ASAN =1.
THanks.
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