[openssl-dev] [openssl.org #4633] EVP self test failure with ARMv8 and Aarch32 flags

[Andy Polyakov via RT]

>> (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 at entry=0x33788,
>     inp=inp at entry=0x33649
> "\232_\314ʹ\317\004\347)='u\314v\244\210\360B8-\224\233C\267ֻ+\230dxg&",
> out=<optimized out>,
>     out at entry=0x335d8
> "\004\065\331v\004\065\331v)='u\314v\244\210\360B8-\224\233C\267ֻ+\230dxg&",
> len=len at 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.


-- 
Ticket here: http://rt.openssl.org/Ticket/Display.html?id=4633
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