[Buildroot] [Bug 8911] New: Using sysvinit inittab and "single" user mode the rcS script still runs
bugzilla at busybox.net
bugzilla at busybox.net
Wed May 4 17:26:10 UTC 2016
https://bugs.busybox.net/show_bug.cgi?id=8911
Bug ID: 8911
Summary: Using sysvinit inittab and "single" user mode the rcS
script still runs
Product: buildroot
Version: unspecified
Hardware: All
OS: Linux
Status: NEW
Severity: normal
Priority: P5
Component: Other
Assignee: unassigned at buildroot.uclibc.org
Reporter: ckhardin at exablox.com
CC: buildroot at uclibc.org
Target Milestone: ---
Expected single user behavior to NOT run the rcS script when runlevel S is
given to sysvinit.
>From the busybox code - when going into single user, the logic is conditional
to not even parse the inittab and jump into the single user shell.
busybox/init/init.c
/* Check if we are supposed to be in single user mode */
if (argv[1]
&& (strcmp(argv[1], "single") == 0 || strcmp(argv[1], "-s") == 0 ||
LONE_CHAR(argv[1], '1'))
) {
/* ??? shouldn't we set RUNLEVEL="b" here? */
/* Start a shell on console */
new_init_action(RESPAWN, bb_default_login_shell, "");
} else {
/* Not in single user mode - see what inittab says */
/* NOTE that if CONFIG_FEATURE_USE_INITTAB is NOT defined,
* then parse_inittab() simply adds in some default
* actions (i.e., INIT_SCRIPT and a pair
* of "askfirst" shells) */
parse_inittab();
}
However, the sysvinit uses the runlevels and the sysinit action runs before a
runlevel has been selected - so, the rcS always runs.
I believe this diff gets what should happen, but their might be a context that
I don't know about for not doing this.
diff --git a/package/sysvinit/inittab b/package/sysvinit/inittab
index 27eb4a6..fad91ea 100644
--- a/package/sysvinit/inittab
+++ b/package/sysvinit/inittab
@@ -10,7 +10,7 @@ si2::sysinit:/bin/mkdir -p /dev/pts
si3::sysinit:/bin/mkdir -p /dev/shm
si4::sysinit:/bin/mount -a
si5::sysinit:/bin/hostname -F /etc/hostname
-si6::sysinit:/etc/init.d/rcS
+rcS:12345:wait:/etc/init.d/rcS
# S0:1:respawn:/sbin/getty -L ttyS0 115200 vt100 # GENERIC_SERIAL
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