check: fix kmemleak scan when DEBUG_KMEMLEAK_DEFAULT_OFF enabled

Scan kmemleak will be failed when DEBUG_KMEMLEAK_DEFAULT_OFF enabled.
We have to add kmemleak=on to cmdline to fully enable kmemleak.

$ grep -rn KMEMLEAK_DEFAULT /boot/config-6.19.0-0.rc6.260122ga66191c590b3b.45.eln154.aarch64+debug
CONFIG_DEBUG_KMEMLEAK_DEFAULT_OFF=y
$ ll /sys/kernel/debug/kmemleak
-rw-r--r--. 1 root root 0 Jan 23 00:12 /sys/kernel/debug/kmemleak
$ echo scan >/sys/kernel/debug/kmemleak
-bash: echo: write error: Operation not permitted

Signed-off-by: Yi Zhang <[email protected]>
Suggested-by: Nilay Shroff <[email protected]>
Suggested-by: Shin'ichiro Kawasaki <[email protected]>

Author: yizhanglinux

check

@@ -208,27 +208,33 @@ _check_kernel_option() {
 	return 1
 }
 
-_setup_kmemleak() {
-	local f="/sys/kernel/debug/kmemleak"
+declare KMEMLEAK=0
+declare KMEMLEAK_FILE=/sys/kernel/debug/kmemleak
 
-	if [[ ! -e $f || ! -r $f ]]; then
-		return 0
+if _check_kernel_option DEBUG_KMEMLEAK && [[ -e $KMEMLEAK_FILE && -r $KMEMLEAK_FILE ]]; then
+	if _check_kernel_option DEBUG_KMEMLEAK_DEFAULT_OFF; then
+		if grep --quiet kmemleak=on /proc/cmdline; then
+			KMEMLEAK=1
+		fi
+	else
+		KMEMLEAK=1
 	fi
+fi
 
-	echo clear > "$f"
+_setup_kmemleak() {
+	if ((KMEMLEAK)) ;then
+		echo clear > "$KMEMLEAK_FILE"
+	fi
 }
 
 _check_kmemleak() {
 	local kmemleak
-	local f="/sys/kernel/debug/kmemleak"
 
-	if [[ ! -e $f || ! -r $f ]]; then
-		return 0
-	fi
+	((KMEMLEAK)) || return 0
 
-	echo scan > "$f"
+	echo scan > "$KMEMLEAK_FILE"
 	sleep 1
-	kmemleak=$(cat "$f")
+	kmemleak=$(cat "$KMEMLEAK_FILE")
 
 	if [[ -z $kmemleak ]]; then
 		return 0