[LEDE-DEV] dropbear & gcc 7.1.0

[Syrone Wong]

I checked the bundled libtom* in dropbear:

bundled: libtomcrypt is 1.16, libtommath is 0.40
latest: libtomcrypt is 1.17, libtommath is 1.0

There are various fixes since the bundled version:
https://github.com/libtom/libtommath/releases

I will try the latest version from libtom.


Best Regards,
Syrone Wong


On Thu, Jun 1, 2017 at 3:17 AM, e9hack <e9hack at gmail.com> wrote:
> Am 30.05.2017 um 08:25 schrieb Syrone Wong:
>> Can this related to endianness? Based on current reports, it only
>> occurs on big-endian platforms.
>>
>> I found:
>>
>> * Note: in order to use the optimized macros your platform must
>> support unaligned 32 and 64 bit read/writes.
>> * The x86 platforms allow this but some others [ARM for instance] do
>> not. On those platforms you **MUST**
>> * use the portable [slower] macros.
>>
>> in https://github.com/mkj/dropbear/blob/master/libtomcrypt/src/headers/tomcrypt_cfg.h
>>
>> A quick way to verify this might be define LTC_NO_ASM.
>
> Defining LTC_NO_ASM doesn't help. It seems, the problem is somewhere in libtommath. Patching of Makefile.in in
> libtommath solves the problem for me:
>
> #################
> --- a/libtommath/Makefile.in    2017-05-18 16:47:02.000000000 +0200
> +++ b/libtommath/Makefile.in    2017-05-31 18:21:24.318437603 +0200
> @@ -11,6 +11,8 @@
>  # So that libtommath can include Dropbear headers for options and m_burn()
>  CFLAGS += -I. -I$(srcdir) -I../libtomcrypt/src/headers/ -I$(srcdir)/../libtomcrypt/src/headers/ -I../ -I$(srcdir)/../
>
> +CFLAGS += -O2
> +
>  ifndef IGNORE_SPEED
>
>  #for speed
> #################
>
> Regards,
> Hartmut
>
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