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When making a pause after detecting hard kill of the single-user

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shell, ensure that we do sleep for at least the specified time, in
presence of signals.

Interrupted sleep(3) is followed by _exit(), which might cause 'Going
nowhere without my init' panic if init(8) exits before the reboot(2)
really started, or before SIGTSTP stopped init(8) (both events are
initiated by the parallel reboot(8) operation).

I do not see other calls to sleep(STALL_TIMEOUT) as having the same
disasterous consequences and kept them as is until the similar change
is proven required.

Reported and tested by:	Andy Farkas <chuzzwassa@gmail.com>
Sponsored by:	The FreeBSD Foundation
MFC after:	3 weeks
This commit is contained in:
kib 2016-10-07 13:41:28 +00:00
parent 6b647a7ab8
commit c7d05abb4c
1 changed files with 9 additions and 1 deletions
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10
sbin/init/init.c
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@ -870,6 +870,7 @@ single_user(void)
sigset_t mask;
const char *shell;
char *argv[2];
struct timeval tv, tn;
#ifdef SECURE
struct ttyent *typ;
struct passwd *pp;
@ -1002,7 +1003,14 @@ single_user(void)
* reboot(8) killed shell?
*/
warning("single user shell terminated.");
sleep(STALL_TIMEOUT);
gettimeofday(&tv, NULL);
tn = tv;
tv.tv_sec += STALL_TIMEOUT;
while (tv.tv_sec > tn.tv_sec || (tv.tv_sec ==
tn.tv_sec && tv.tv_usec > tn.tv_usec)) {
sleep(1);
gettimeofday(&tn, NULL);
}
_exit(0);
} else {
warning("single user shell terminated, restarting");