[Bug 259380] linux(4): linux_recvfrom(2) fails: linux_recvfrom -1 errno -22 Invalid argument

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=259380

--- Comment #11 from Jason Mader <jasonmader@gmail.com> ---
(In reply to Jason Mader from comment #10)
When linux_recvfrom() calls kern_recvit() the value of msg.msg_namelen is 28,
and after the call it is 0.

kern_recvit() source didn't change, but bsd_to_linux_sockaddr() did. Prior to
FreeBSD 12.2, bsd_to_linux_sockaddr() didn't check the value of msg.msg_namelen
(as len). Now it does,

        if (len < 2 || len > UCHAR_MAX)
                return (EINVAL);

I am currently working around this with,

--- linux_socket.c
+++ linux_socket.c
@@ -926,10 +926,10 @@
                goto out;

        if (PTRIN(args->from) != NULL) {
-               error = bsd_to_linux_sockaddr(sa, &lsa, msg.msg_namelen);
+               error = bsd_to_linux_sockaddr(sa, &lsa, fromlen);
                if (error == 0)
                        error = copyout(lsa, PTRIN(args->from),
-                           msg.msg_namelen);
+                           fromlen);
                free(lsa, M_SONAME);
        }

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