Enhance diagnostics of address truncation in sockname family syscalls

* net.c (decode_sockname): Print both user and kernel address lengths
when the returned address is truncated.
* tests/sun_path.expected: Update expected output.

1 files changed, 4 insertions, 1 deletions

diff --git a/net.c b/net.c
index 86d93fc23..245cae9a9 100644
--- a/net.c
+++ b/net.c
@@ -225,7 +225,10 @@ decode_sockname(struct tcb *tcp)
 		tprintf(", [%d]", ulen);
 	} else {
 		decode_sockaddr(tcp, tcp->u_arg[1], ulen > rlen ? rlen : ulen);
-		tprintf(", [%d]", rlen);
+		if (ulen < rlen)
+			tprintf(", [%d->%d]", ulen, rlen);
+		else
+			tprintf(", [%d]", rlen);
 	}
 
 	return RVAL_DECODED;