[MiNT] OpenSSH: PRNG is not seeded

[Vincent Rivière <vincent.riviere@freesbee.fr>]

Hello.

I'm currently rebuilding OpenSSH for MiNT.
Basically, it works perfectly, but I face something which looks like a bug.

I run sshd on the ARAnyM side.
Then I connect from Windows using PuTTY/KiTTY/WinSCP.

When trying to get more than 1 or 2 simultaneous connexions, I get the 
following message in the server log:
PRNG is not seeded

I hunted it and I arrived into OpenSSL, file crypto/rand/rand_unix.c.
See line 324:
http://git.openssl.org/gitweb/?p=openssl.git;a=blob;f=crypto/rand/rand_unix.c

The code tries to read /dev/urandom. It uses select() to determine if there 
is something to read, and avoid blocking. But it seems that something goes 
wrong in FreeMiNT, and sometimes select() does not indicate that data is 
available. Hence the damn "PRNG is not seeded" error.

If I replace the line 324 by "if (1)" to force:
/* can't use select, so just try to read once anyway */
    try_read = 1;
then it works perfectly and I don't have any trouble.

Is it possible that select() on /dev/urandom sometimes fails to signal that 
data is always available? Maybe that assumption is wrong?
I'm not familiar with select() or even FreeMiNT devices, so I'm not sure to 
understand where the problem actually is.

Alan, did you encounter such trouble with sshd?
Do someone propose a best alternative than the patch I proposed above?

NB: The stack for the sftp-server tool must be set to 128k otherwise it may 
crash prematurely.

--
Vincent Rivière