Bug#575204: initscripts: grep complains about invalid back reference in umountfs

[Dmitry Bogatov]

[2019-02-19 04:46] Pierre Ynard <linkfanel at yahoo.fr>
>
> part       text/plain                 571
> > Probably we could just pass -F option to grep?
>
> grep -F would seem a lot safer in many places, yes.

Okay, collegues, what do you think about this patch? It solves problem
at hand, but would introduce another false-positive, if mount options
can look like absolute file path. Can they?

From 16e9c7ba09032523c209aab79b3e3f774ce49a9b Mon Sep 17 00:00:00 2001
From: Dmitry Bogatov <KAction at debian.org>
Date: Fri, 5 Apr 2019 19:18:06 +0000
Subject: [PATCH] Correctly quote arguments to grep in umountfs script (Closes:
 #575204)

---
 debian/src/initscripts/etc/init.d/umountfs | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/debian/src/initscripts/etc/init.d/umountfs b/debian/src/initscripts/etc/init.d/umountfs
index b75095ee..633a3f6d 100755
--- a/debian/src/initscripts/etc/init.d/umountfs
+++ b/debian/src/initscripts/etc/init.d/umountfs
@@ -23,7 +23,7 @@ do_stop () {
 	TMPFS_MTPTS=""
 	while read -r DEV MTPT FSTYPE REST
 	do
-		echo "$PROTECTED_MOUNTS" | grep -qs "^$DEV $MTPT " && continue
+		echo "$PROTECTED_MOUNTS" | grep -qsF "$DEV $MTPT " && continue
 		case "$MTPT" in
 		  /|/usr|/proc|/dev|/.dev|/dev/pts|/dev/shm|/dev/.static/dev|/proc/*|/sys|/sys/*|/run|/run/lock|/run/shm|/run/rpc_pipefs|/dev/vcs)
 			continue
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