[PATCH] unix: escape all null bytes in abstract unix domain socket
From: Isaac Boukris <hidden>
Date: 2016-10-29 19:22:26
Also in:
lkml
Subsystem:
networking [general], networking [unix sockets], the rest · Maintainers:
"David S. Miller", Eric Dumazet, Jakub Kicinski, Paolo Abeni, Kuniyuki Iwashima, Linus Torvalds
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 <redacted> --- net/unix/af_unix.c | 13 +++++++++---- 1 file changed, 9 insertions(+), 4 deletions(-)
diff --git a/net/unix/af_unix.c b/net/unix/af_unix.c
index 145082e..9250b03 100644
--- a/net/unix/af_unix.c
+++ b/net/unix/af_unix.c@@ -2805,14 +2805,19 @@ static int unix_seq_show(struct seq_file *seq, void *v) i = 0; len = u->addr->len - sizeof(short); - if (!UNIX_ABSTRACT(s)) + if (!UNIX_ABSTRACT(s)) { len--; - else { + for ( ; i < len; i++) + seq_putc(seq, + u->addr->name->sun_path[i]); + } else { seq_putc(seq, '@'); i++; + for ( ; i < len; i++) + seq_putc(seq, + u->addr->name->sun_path[i] ?: + '@'); } - for ( ; i < len; i++) - seq_putc(seq, u->addr->name->sun_path[i]); } unix_state_unlock(s); seq_putc(seq, '\n');
--
2.7.4