Re: [exim] SSL/TLS

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Szerző: Phil Pennock
Dátum:  
Címzett: The Doctor
CC: exim-users, Cyborg
Tárgy: Re: [exim] SSL/TLS
On 2012-11-02 at 13:32 -0600, The Doctor wrote:
> 2012-11-01 22:08:42 1TU8XV-0006bT-9B == netknowca@??? R=dnslookup T=remote_smtp defer (-1): smtp transport process returned non-zero status 0x000b: terminated by signal 11
> 2012-11-01 22:09:42 1TU8Yn-0006h2-F0 == swttwt0606@??? R=dnslookup T=remote_smtp defer (-1): smtp transport process returned non-zero status 0x000b: terminated by signal 11


That means that the Exim delivery process is crashing with a SIGSEGV,
because of the TLS usage. So you're crashing inside OpenSSL.

To date, there have been three reasons for this:

 (1) memory corruption on a bad system, flipping bits
 (2) Exim built against a different version of OpenSSL than running
     against
 (3) Unknown cause, happening deep inside OpenSSL.


The third case was fairly recently on exim-dev. Only one report so far,
so if this is the problem you have then you'd make report #2.

The problem here is that Exim is setuid, so crash-dumps are normally
inhibited by the kernel and it requires a lot of potentially dangerous
fiddling to override that. So proving where this happens requires some
diagnostic and C programming skill.

For this third case, so far it looks like a mystery crash inside OpenSSL
and we haven't yet found a cause or anything that Exim is doing to
trigger it.

Building against GnuTLS avoids the issue.

Can you tell us more about how OpenSSL was built?

-Phil