Merge fix regression test failures for when /tmp is mounted as tmpfs

MR: https://gitlab.com/apparmor/apparmor/-/merge_requests/1283
Approved-by: John Johansen <john@jjmx.net>
Merged-by: John Johansen <john@jjmx.net>
(cherry picked from commit 1fc944bb671c9c02a98213c848217a80d6ee956f)
Signed-off-by: John Johansen <john.johansen@canonical.com>

tests/regression/apparmor/mount.inc

@@ -0,0 +1,30 @@
+root_was_shared="no"
+root="/"
+
+# systemd mounts / and everything under it MS_SHARED. This breaks
+# pivot_root and mount "move" operations entirely, so attempt to
+# detect from which mount point the test is running from, and remount
+# it MS_PRIVATE temporarily.
+FINDMNT=/bin/findmnt
+if [ -x "${FINDMNT}" ] && ${FINDMNT} -no TARGET,PROPAGATION -T $tmpdir > /dev/null 2>&1 ; then
+	output="$(${FINDMNT} -no TARGET,PROPAGATION -T $tmpdir)"
+	root="$(echo $output | cut -d' ' -f1)"
+	if [ "$(echo $output | cut -d' ' -f2)" == "shared" ] ; then
+		root_was_shared="yes"
+	fi
+elif [ "$(ps hp1  -ocomm)" = "systemd" ] ; then
+	# no findmnt or findmnt doesn't know the PROPAGATION column,
+	# but init is systemd so assume rootfs is shared
+	root_was_shared="yes"
+fi
+if [ "${root_was_shared}" = "yes" ] ; then
+	[ -n "$VERBOSE" ] && echo "notice: re-mounting $root as private"
+	mount --make-private $root
+fi
+
+prop_cleanup() {
+	if [ "${root_was_shared}" = "yes" ] ; then
+		[ -n "$VERBOSE" ] && echo "notice: re-mounting $root as shared"
+		mount --make-shared $root
+	fi
+}

tests/regression/apparmor/mount.sh

@@ -32,7 +32,8 @@ mount_point2=$tmpdir/mountpoint2
 mount_bad=$tmpdir/mountbad
 loop_device="unset" 
 fstype="ext2"
-root_was_shared="no"
+
+. $bin/mount.inc
 
 setup_mnt() {
 	/bin/mount -n -t${fstype} ${loop_device} ${mount_point}
@@ -59,9 +60,7 @@ mount_cleanup() {
 	then
 		/sbin/losetup -d ${loop_device} &> /dev/null
 	fi
-	if [ "${root_was_shared}" = "yes" ] ; then
+	prop_cleanup
-		mount --make-shared /
-	fi
 }
 do_onexit="mount_cleanup"
 
@@ -81,23 +80,6 @@ fi
 loop_device=$(losetup -f) || fatalerror 'Unable to find a free loop device'
 /sbin/losetup "$loop_device" ${mount_file} > /dev/null 2> /dev/null
 
-# systemd mounts / and everything under it MS_SHARED which does
-# not work with "move", so attempt to detect it, and remount /
-# MS_PRIVATE temporarily. snippet from pivot_root.sh
-FINDMNT=/bin/findmnt
-if [ -x "${FINDMNT}" ] && ${FINDMNT} -no PROPAGATION / > /dev/null 2>&1 ; then
-	if [ "$(${FINDMNT} -no PROPAGATION /)" == "shared" ] ; then
-		root_was_shared="yes"
-	fi
-elif [ "$(ps hp1  -ocomm)" = "systemd" ] ; then
-	# no findmnt or findmnt doesn't know the PROPAGATION column,
-	# but init is systemd so assume rootfs is shared
-	root_was_shared="yes"
-fi
-if [ "${root_was_shared}" = "yes" ] ; then
-	mount --make-private /
-fi
-
 options=(
 	# default and non-default options
 	"rw,ro"

tests/regression/apparmor/pivot_root.sh

@@ -25,7 +25,8 @@ put_old=${new_root}put_old/
 bad=$tmpdir/BAD/
 proc=$new_root/proc
 fstype="ext2"
-root_was_shared="no"
+
+. $bin/mount.inc
 
 pivot_root_cleanup() {
 	mountpoint -q "$proc"
@@ -38,10 +39,7 @@ pivot_root_cleanup() {
 		umount "$new_root"
 	fi
 
-	if [ "${root_was_shared}" = "yes" ] ; then
+	prop_cleanup
-		[ -n "$VERBOSE" ] && echo 'notice: re-mounting / as shared'
-		mount --make-shared /
-	fi
 }
 do_onexit="pivot_root_cleanup"
 
@@ -50,24 +48,6 @@ if [ ! -b /dev/loop0 ] ; then
 	modprobe loop
 fi
 
-# systemd mounts / and everything under it MS_SHARED. This breaks
-# pivot_root entirely, so attempt to detect it, and remount /
-# MS_PRIVATE temporarily.
-FINDMNT=/bin/findmnt
-if [ -x "${FINDMNT}" ] && ${FINDMNT} -no PROPAGATION / > /dev/null 2>&1 ; then
-	if [ "$(${FINDMNT} -no PROPAGATION /)" = "shared" ] ; then
-		root_was_shared="yes"
-	fi
-elif [ "$(ps hp1  -ocomm)" = "systemd" ] ; then
-	# no findmnt or findmnt doesn't know the PROPAGATION column,
-	# but init is systemd so assume rootfs is shared
-	root_was_shared="yes"
-fi
-if [ "${root_was_shared}" = "yes" ] ; then
-	[ -n "$VERBOSE" ] && echo 'notice: re-mounting / as private'
-	mount --make-private /
-fi
-
 # Create disk image since pivot_root doesn't allow old root and new root to be
 # on the same filesystem
 dd if=/dev/zero of="$disk_img" bs=1024 count=512 2> /dev/null

tests/regression/apparmor/swap.sh

@@ -27,16 +27,38 @@ bin=$pwd
 ## A. SWAP
 ##
 
-# check if we can run the test at all
+swap_file=$tmpdir/swapfile
+
+# check if we can run the test in tmpdir
 fstype=$(stat -f --format '%T' "${tmpdir}")
 if [ "${fstype}" = "tmpfs" ] ; then
-	echo "ERROR: tmpdir '${tmpdir}' is of type tmpfs; can't mount a swapfile on it" 1>&2
+	# create a mountpoint not tmpfs
-	echo "ERROR: skipping swap tests" 1>&2
+	mount_file=$tmpdir/mountfile
-	num_testfailures=1
+	mount_point=$tmpdir/mountpoint
-	exit
+	fstype="ext2"
+	dd if=/dev/zero of=${mount_file} bs=1024 count=900 2> /dev/null
+	/sbin/mkfs -t${fstype} -F ${mount_file} > /dev/null 2> /dev/null
+	/bin/mkdir ${mount_point}
+
+	loop_device=$(losetup -f) || fatalerror 'Unable to find a free loop device'
+	/sbin/losetup "$loop_device" ${mount_file} > /dev/null 2> /dev/null
+
+	/bin/mount -n -t${fstype} ${loop_device} ${mount_point}
+
+	swap_file=$mount_point/swapfile
 fi
 
-swap_file=$tmpdir/swapfile
+remove_mnt() {
+	mountpoint -q "${mount_point}"
+	if [ $? -eq 0 ] ; then
+		/bin/umount -t${fstype} ${mount_point}
+	fi
+	if [ -n "$loop_device" ]
+	then
+		/sbin/losetup -d ${loop_device} &> /dev/null
+	fi
+}
+do_onexit="remove_mnt"
 
 # ppc64el wants this to be larger than 640KiB
 # arm/small machines want this as small as possible