ktrace: Handle uio_resid underflow via MSG_TRUNC

[markj]

Summary

When recvmsg(2) is used with MSG_TRUNC on an atomic socket type (DGRAM
or SEQPACKET), soreceive_generic() and uipc_peek_dgram() may
intentionally underflow uio_resid so that userspace can find out how
many bytes it should have asked for.

If this happens, and KTR_GENIO is enabled, ktrgenio() will attempt to
copy in beyond the end of the output buffer's iovec. In general this
will silently cause the ktrace operation to fail since it'll result in
EFAULT from uiomove(). Let's be more careful and make sure not to try
and copy more bytes than we have.

Reported by: [e-mail]

[kib]

sys/kern/uipc_syscalls.c

951–952