security/clamav: Segmentation fault when running clamav in a 32-bit jail on a 64-bit host

Jeremy Chadwick freebsd at
Fri Aug 27 17:07:42 UTC 2010

On Fri, Aug 27, 2010 at 12:46:48PM -0400, Glen Barber wrote:
> On 8/27/10 12:33 PM, Kurt Jaeger wrote:
> > Hi!
> > 
> >> I have a few clamav instances running in jails on 32-bit hosts without
> >> any issues.  A few days ago one of these jails was migrated to a 64-bit
> >> host (8.1-RELEASE), where I noticed clamd (0.96.2_1) segfaults when queried.
> >>
> >> The issue seems specific to 32bit/64bit compatibility.  I have a gdb
> >> session available here:
> >>
> >> Any thoughts on if this is possible?
> > 
> > Try
> > 
> > Bytecode no
> > 
> > in clamd.conf ?
> > 
> It was set to 'yes' initially.  I thought it was disabled with building
> without JIT.  At any rate, no, it still segfaults with the same backtrace.

1) Is clamd built with debugging symbols enabled?  If not, you might want
to rebuild it with such, else it might be difficult to debug the

Also, if the segfault happens after performing the above, can you
provide output from "bt full" instead of just "bt"?

2) Was the software rebuilt from source after the upgrade from i386 to
amd64, or are you expecting the software to work without any hitches
running on amd64 with lib32 (32-bit compatibility libaries)?  The latter
is not always possible/the case.

I have no familiarity with the software or functions in question, but an
initial guess would be that some piece of the code is making assumptions
about the size of pointers (expecting 4 (32-bit) rather than 8
(64-bit)).  Speculative on my part, but I ponder such when seeing code
like somefunc(sizeof(int)).

| Jeremy Chadwick                                   jdc at |
| Parodius Networking              |
| UNIX Systems Administrator                  Mountain View, CA, USA |
| Making life hard for others since 1977.              PGP: 4BD6C0CB |

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