[openssl-users] segv in 1.0.2 bn_power5

sandeep kiran p sandeepkiranp at gmail.com
Wed Apr 6 13:04:11 UTC 2016


Ours is a TLS proxy component where we act as MITM for certain traffic
between clients and servers for analysis. We recently migrated from 1.0.1q
to 1.0.2g after which we are seeing frequent crashes in the process all
with the following backtrace

#1  0x00007f877ea2427f in sigcrash (signo=11, info=<optimized out>,
#2  <signal handler called>
#3  bn_sqr8x_internal () at x86_64-mont5.s:1369
#4  0x00007f877b5a7ebf in bn_power5 () at x86_64-mont5.s:797
#5  0x0000000000000100 in ?? ()
#6  0x00007fff899b6530 in ?? ()
#7  0x00007f8786e9f140 in ?? ()
#8  0x0000000000000000 in ?? ()

The process is single threaded where we process packets as they come along.
When the process is lightly loaded (around 10 connections) things are fine.
We see the crash when we are processing say more than 40 connections.

Everything was working perfectly fine in 1.0.1.

Can someone hep us on what could have gone wrong with 1.0.2?

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