correctly use HOST_NAME_MAX.

Some notes:
POSIX HOST_NAME_MAX doesn't include the NUL.
POSIX LOGIN_NAME_MAX and TTY_NAME_MAX do include the NUL.

BSD MAXHOSTNAMELEN includes the NUL.  Actually, most of the historical
BSD MAX* defines did include the NUL, except for the historical
mistake of utmp fields without NULs in the string, which directly led
to strncpy..  just showing how error prone this kind of accounting is.
CSRG did right.  Somehow POSIX missed the memo on the concepts of
carefulness and consistancy, and we are still paying the price when
people trip over this.  Of course, glibc is even more amazing (that is
a hint to blackhats)

ok guenther

diff --git a/usr.bin/tmux/format.c b/usr.bin/tmux/format.c
index 7abe2db..2185af1 100644 (file)
--- a/usr.bin/tmux/format.c
+++ b/usr.bin/tmux/format.c
@@ -1,4 +1,4 @@
-/* $OpenBSD: format.c,v 1.55 2014/12/09 19:23:35 nicm Exp $ */
+/* $OpenBSD: format.c,v 1.56 2015/01/11 04:14:40 deraadt Exp $ */
 
 /*
  * Copyright (c) 2011 Nicholas Marriott <nicm@users.sourceforge.net>
@@ -133,7 +133,7 @@ struct format_tree *
 format_create(void)
 {
        struct format_tree      *ft;
-       char                     host[MAXHOSTNAMELEN], *ptr;
+       char                     host[HOST_NAME_MAX+1], *ptr;
 
        ft = xcalloc(1, sizeof *ft);
        RB_INIT(&ft->tree);

diff --git a/usr.bin/tmux/screen.c b/usr.bin/tmux/screen.c
index 07e77d0..f39ce37 100644 (file)
--- a/usr.bin/tmux/screen.c
+++ b/usr.bin/tmux/screen.c
@@ -1,4 +1,4 @@
-/* $OpenBSD: screen.c,v 1.32 2014/11/06 09:17:25 nicm Exp $ */
+/* $OpenBSD: screen.c,v 1.33 2015/01/11 04:14:40 deraadt Exp $ */
 
 /*
  * Copyright (c) 2007 Nicholas Marriott <nicm@users.sourceforge.net>
@@ -31,11 +31,11 @@ void        screen_resize_y(struct screen *, u_int);
 void
 screen_init(struct screen *s, u_int sx, u_int sy, u_int hlimit)
 {
-       char host[HOST_NAME_MAX];
+       char host[HOST_NAME_MAX+1];
 
        s->grid = grid_create(sx, sy, hlimit);
 
-       if (gethostname(host, HOST_NAME_MAX) == 0)
+       if (gethostname(host, sizeof(host)) == 0)
                s->title = xstrdup(host);
        else
                s->title = xstrdup("");