On 29/05/17 16:54, e9hack wrote:
Am 29.05.2017 um 10:13 schrieb Bastian Bittorf:
* Syrone Wong <wong.syr...@gmail.com> [29.05.2017 10:03]:
have you tried to '/etc/init.d/dropbear'?

The problem is you cannot access the router, which means you cannot
execute any commands.

ok, maybe you can execute a command with LuCI?
(i'am not familiar with LuCI)
maybe you can try serial console.
maybe you can put that into /etc/rc.local

i wanted to write: '/etc/init.d/dropbear restart', sorry for that.


I did try it already with custom commands from LuCI. It doesn't help. Dropbear 
is still running but to connect isn't
possible.

Had a really quick play with this and as I suspected it's related to compiler optimization flags. In essence, if I compile with '-Os' then dropbear plays dumb, with my usual (but different from default) of '-O2' then dropbear, gcc 7 & mips get on fine, irrespective of target -march settings.

So as further totally wild guesses and on the basis 'ssh -vvv' shows things hanging during the initial ECDH key exchange, I'm going to guess this is happening somewhere in the libtommath/crypt libraries.

Kevin

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