>> (gdb) bt full
>> #0 0x76eef56c in CRYPTO_ccm128_decrypt () from ./libcrypto.so.1.1
>> No symbol table info available.
>> #1 0x76ed6708 in aes_ccm_cipher () from ./libcrypto.so.1.1
>> No symbol table info available.
>> #2 0x76edcac0 in EVP_DecryptUpdate () from ./libcrypto.so.1.1
>> No symbol table info available.
>> #3 0x000149cc in cipher_test_run ()
>> No symbol table info available.
>> #4 0x0001408c in setup_test ()
>> No symbol table info available.
>> #5 0x00011a48 in main ()
>> No symbol table info available.
>
> OK, -O1 failed to reproduce it; but -O2 reproduced it:
Well, what can I say? This is first indication that it's a compiler bug...
> (gdb) r test/evptests.txt
> Starting program: /home/jwalton/openssl/test/evp_test test/evptests.txt
> [Thread debugging using libthread_db enabled]
> Using host libthread_db library "/lib/arm-linux-gnueabihf/libthread_db.so.1".
>
> Program received signal SIGBUS, Bus error.
> CRYPTO_ccm128_decrypt (ctx=ctx@entry=0x33788,
> inp=inp@entry=0x33649
> "\232_\314ʹ\317\004\347)='u\314v\244\210\360B8-\224\233C\267ֻ+\230dxg&",
> out=<optimized out>,
> out@entry=0x335d8
> "\004\065\331v\004\065\331v)='u\314v\244\210\360B8-\224\233C\267ֻ+\230dxg&",
> len=len@entry=0x20) at crypto/modes/ccm128.c:253
> 253 ctx->cmac.u[0] ^= (scratch.u[0] ^= temp.u[0]);
> (gdb)
This line is within #if defined(STRICT_ALIGNMENT), which means that
compiler is responsible for aligning data, and SIGBUS means that it
failed. And indeed, looking at disassembler output it crashes in vld1.64
{d16-d17}, [r6 :64], instruction that requires 64-bit alignment. So
compiler generated the instruction, but didn't care to ensure the
alignment. There is no other conclusion one can draw but that is indeed
a compiler bug. Besides, default ./config works just fine and (once
again) I see no compelling reason for not using it.
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