segfault after recvmsg in 32-bit jail running on 64-bit kernel

[Stef Walter]

I'm running older 32-bit jails on a new 64-bit kernels for some clients.
Ran into a problem with certain applications that use recvmsg (in this
case clamd from security/clamav port).

recvmsg() uses struct msghdr for in/out data. However in many cases the
msg_controllen is not properly set after calling recvmsg() from from a
32-bit process running on a 64-bit kernel.

Just wanted to give folks a heads up in case anyone runs into the same
issue.

PR filed with details, patch and test program to reproduce problem:

http://www.freebsd.org/cgi/query-pr.cgi?pr=149227

Cheers,

Stef


PS: I'm travelling and this computer is not receiving email from the
list, so please include me on any responses to this thread.