Control: retitle -1 afl: FTBFS on armhf (illegal instruction in afl-clang-fast)
On Fri, 21 Oct 2016 02:08:28 +0200 Daniel Stender wrote:
> Thanks for any input (if this could be worked around in the AFL package),
I am able to reproduce the failure on abel but not harris/asachi.
Retitling the bug since it occurs in afl-clang-fast not in the test code:
Program received signal SIGILL, Illegal instruction.
0x7f556094 in edit_params (argc=<optimized out>, argv=<optimized out>) at
afl-clang-fast.c:224
224 cc_params[cc_par_cnt++] = "-D__AFL_HAVE_MANUAL_CONTROL=1";
These are the CPU features for each of them:
abel: Features : swp half thumb fastmult vfp edsp thumbee vfpv3 tls
idiva idivt vfpd32 lpae
asachi: Features : half thumb fastmult vfp edsp neon vfpv3 tls
vfpv4 idiva idivt lpae evtstrm
harris: Features : swp half thumb fastmult vfp edsp thumbee neon vfpv3 tls
vfpd32
Seems like the issue is lack of neon since that is the only thing in
common between harris/asachi that is missing on abel.
I disassembled the code where the crash happens & got this instruction:
=> 0x7f556094 <+1924>: vst1.32 {d16-d17}, [r0]!
Doing a web search indicates this is a NEON instruction. The binary
(afl-clang-fast) that contains vst1.32 was compiled by clang-3.9.
Looking at build logs, the failures started when afl started building
with LLVM 3.8.
--
bye,
pabs
https://wiki.debian.org/PaulWise
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