From b6dc13c2d3754704b1bf5af4e6b957b48585102f Mon Sep 17 00:00:00 2001 From: Jonathan Liu Date: Tue, 21 May 2013 17:01:55 +0200 Subject: sulogin: allow system maintenance login if root password is empty The current password checking is unable to distinguish between the user entering an empty password or pressing Control-D. As a result, an empty password always results in normal startup. We modify bb_ask to return NULL if Control-D is pressed without entering a password. The sulogin applet is then modified to only proceed to normal startup if bb_ask returns NULL. This covers EOF with no password, interrupt by timeout and ^C. Signed-off-by: Jonathan Liu Signed-off-by: Denys Vlasenko --- loginutils/sulogin.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) (limited to 'loginutils') diff --git a/loginutils/sulogin.c b/loginutils/sulogin.c index f79802a4d..65e638489 100644 --- a/loginutils/sulogin.c +++ b/loginutils/sulogin.c @@ -83,8 +83,8 @@ int sulogin_main(int argc UNUSED_PARAM, char **argv) cp = bb_ask(STDIN_FILENO, timeout, "Give root password for system maintenance\n" "(or type Control-D for normal startup):"); - - if (!cp || !*cp) { + if (!cp) { + /* ^D, ^C, timeout, or read error */ bb_info_msg("Normal startup"); return 0; } -- cgit v1.2.3