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MFC r346038:

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Exercise some care before sending SIGHUP to mountd.
This commit is contained in:
Konstantin Belousov 2019-04-15 13:12:54 +00:00
parent 86ddf94a52
commit 2eb564de0a
1 changed files with 11 additions and 0 deletions
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11
sbin/mount/mount.c
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@ -224,6 +224,7 @@ restart_mountd(void)
struct pidfh *pfh;
pid_t mountdpid;
mountdpid = 0;
pfh = pidfile_open(_PATH_MOUNTDPID, 0600, &mountdpid);
if (pfh != NULL) {
/* Mountd is not running. */
@ -234,6 +235,16 @@ restart_mountd(void)
/* Cannot open pidfile for some reason. */
return;
}
/*
* Refuse to send broadcast or group signals, this has
* happened due to the bugs in pidfile(3).
*/
if (mountdpid <= 0) {
warnx("mountd pid %d, refusing to send SIGHUP", mountdpid);
return;
}
/* We have mountd(8) PID in mountdpid varible, let's signal it. */
if (kill(mountdpid, SIGHUP) == -1)
err(1, "signal mountd");