Oh, the irony....
Testing MessageDigest algorithm SHA-3-224.
......
Program received signal SIGSEGV, Segmentation fault.
0x004d7235 in CryptoPP::xorbuf (
buf=0x8004dc0a
"\276Y\255\064^|Lo!$\374զ\203\f\244\347bc\237\311xV4\367H\021\331\304\\\347\276\306(\254jŭ\233\300W\016\062m\274yk\371\375\274\377\241ڿ\276\220wc\360<Q\337/\266\231\267߸\274-\242\272\262i\251H\006\272b\037
\376\275\004eMk\261\200\004\210ֆ\362r\031\237\372v\f\256\320r\344\353\320=\212\246\023\365\347X\036\067ָö\220\271\302i\315U&",
mask=0x28adf3 'a' <repeats 200 times>..., count=count@entry=0x46)
at misc.cpp:41
41 ((word32*)buf)[i] ^= ((word32*)mask)[i];
(gdb)
And its our old friend, this time showing its head on word32:
(gdb) disass
Dump of assembler code for function CryptoPP::xorbuf(unsigned char*,
unsigned char const*, unsigned int):
0x004d7120 <+0>: push %ebp
0x004d7121 <+1>: mov %esp,%ebp
...
0x004d721a <+250>: mov 0xc(%esp),%edx
0x004d721e <+254>: vmovdqu (%eax,%ebx,1),%xmm1
0x004d7223 <+259>: vinsertf128 $0x1,0x10(%eax,%ebx,1),%ymm1,%ymm0
0x004d722b <+267>: addl $0x1,0x1c(%esp)
0x004d7230 <+272>: vxorps (%edx,%ebx,1),%ymm0,%ymm0
=> 0x004d7235 <+277>: vmovdqa %ymm0,(%edx,%ebx,1)
0x004d723a <+282>: mov 0x1c(%esp),%edx
0x004d723e <+286>: add $0x20,%ebx
...
We now have CRYPTOPP_NO_UNALIGNED_DATA_ACCESS. We can enable it (1) project
wide. Or we can band-aide it and (2) enable it for Cygwin; maybe even (3)
enable it for Cygwin i386.
Or, we can add yet another band-aide, and change the IsAligned<word32> to
IsStrictAligned<word32>.
How do you guys want to proceed? Any thing other than (1) is a band-aide
that's going to lead to future trouble.
Jeff
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