unix: escape all null bytes in abstract unix domain socket

Abstract unix domain socket may embed null characters,
these should be translated to '@' when printed out to
proc the same way the null prefix is currently being
translated.

This helps for tools such as netstat, lsof and the proc
based implementation in ss to show all the significant
bytes of the name (instead of getting cut at the first
null occurrence).

Signed-off-by: Isaac Boukris <iboukris@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

diff --git a/net/unix/af_unix.c b/net/unix/af_unix.c
index 145082e2ba36068192ccef517804a14aa0d08752..5d1c14a2f26823f403d2677e27a34b9a2e5a3d6d 100644 (file)
--- a/net/unix/af_unix.c
+++ b/net/unix/af_unix.c
@@ -2812,7 +2812,8 @@ static int unix_seq_show(struct seq_file *seq, void *v)
                                i++;
                        }
                        for ( ; i < len; i++)
-                               seq_putc(seq, u->addr->name->sun_path[i]);
+                               seq_putc(seq, u->addr->name->sun_path[i] ?:
+                                        '@');
                }
                unix_state_unlock(s);
                seq_putc(seq, '\n');